Rename `Value` to `JsValue` (#1457)

boa/examples/classes.rs

@@ -2,7 +2,7 @@ use boa::{
     class::{Class, ClassBuilder},
     gc::{Finalize, Trace},
     property::Attribute,
-    Context, Result, Value,
+    Context, JsValue, Result,
 };
 
 // We create a new struct that is going to represent a person.
@@ -26,7 +26,7 @@ struct Person {
 // or any function that matches that signature.
 impl Person {
     /// This function says hello
-    fn say_hello(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    fn say_hello(this: &JsValue, _: &[JsValue], context: &mut Context) -> Result<JsValue> {
         // We check if this is an object.
         if let Some(object) = this.as_object() {
             // If it is we downcast the type to type `Person`.
@@ -37,7 +37,7 @@ impl Person {
                     person.name,
                     person.age // Here we can access the native rust fields of Person struct.
                 );
-                return Ok(Value::undefined());
+                return Ok(JsValue::undefined());
             }
         }
         // If `this` was not an object or the type was not an native object `Person`,
@@ -57,7 +57,7 @@ impl Class for Person {
     const LENGTH: usize = 2;
 
     // This is what is called when we do `new Person()`
-    fn constructor(_this: &Value, args: &[Value], context: &mut Context) -> Result<Self> {
+    fn constructor(_this: &JsValue, args: &[JsValue], context: &mut Context) -> Result<Self> {
         // We get the first argument. If it is unavailable we get `undefined`. And, then call `to_string()`.
         //
         // This is equivalent to `String(arg)`.

boa/examples/closures.rs

@@ -1,6 +1,6 @@
-use boa::{Context, JsString, Value};
+use boa::{Context, JsString, JsValue};
 
-fn main() -> Result<(), Value> {
+fn main() -> Result<(), JsValue> {
     let mut context = Context::new();
 
     let variable = JsString::new("I am a captured variable");

boa/src/bigint.rs

@@ -3,7 +3,7 @@
 use crate::{
     builtins::Number,
     gc::{empty_trace, Finalize, Trace},
-    Context, Value,
+    Context, JsValue,
 };
 
 use std::{
@@ -162,7 +162,7 @@ impl JsBigInt {
     }
 
     #[inline]
-    pub fn pow(x: &Self, y: &Self, context: &mut Context) -> Result<Self, Value> {
+    pub fn pow(x: &Self, y: &Self, context: &mut Context) -> Result<Self, JsValue> {
         let y = if let Some(y) = y.inner.to_biguint() {
             y
         } else {
@@ -173,7 +173,7 @@ impl JsBigInt {
     }
 
     #[inline]
-    pub fn shift_right(x: &Self, y: &Self, context: &mut Context) -> Result<Self, Value> {
+    pub fn shift_right(x: &Self, y: &Self, context: &mut Context) -> Result<Self, JsValue> {
         if let Some(n) = y.inner.to_i32() {
             let inner = if n > 0 {
                 x.inner.as_ref().clone().shr(n as usize)
@@ -188,7 +188,7 @@ impl JsBigInt {
     }
 
     #[inline]
-    pub fn shift_left(x: &Self, y: &Self, context: &mut Context) -> Result<Self, Value> {
+    pub fn shift_left(x: &Self, y: &Self, context: &mut Context) -> Result<Self, JsValue> {
         if let Some(n) = y.inner.to_i32() {
             let inner = if n > 0 {
                 x.inner.as_ref().clone().shl(n as usize)

boa/src/builtins/array/array_iterator.rs

@@ -1,5 +1,5 @@
 use crate::{
-    builtins::{function::make_builtin_fn, iterable::create_iter_result_object, Array, Value},
+    builtins::{function::make_builtin_fn, iterable::create_iter_result_object, Array, JsValue},
     gc::{Finalize, Trace},
     object::{GcObject, ObjectData},
     property::PropertyDescriptor,
@@ -22,7 +22,7 @@ pub enum ArrayIterationKind {
 /// [spec]: https://tc39.es/ecma262/#sec-array-iterator-objects
 #[derive(Debug, Clone, Finalize, Trace)]
 pub struct ArrayIterator {
-    array: Value,
+    array: JsValue,
     next_index: u32,
     kind: ArrayIterationKind,
 }
@@ -30,7 +30,7 @@ pub struct ArrayIterator {
 impl ArrayIterator {
     pub(crate) const NAME: &'static str = "ArrayIterator";
 
-    fn new(array: Value, kind: ArrayIterationKind) -> Self {
+    fn new(array: JsValue, kind: ArrayIterationKind) -> Self {
         ArrayIterator {
             array,
             kind,
@@ -48,10 +48,10 @@ impl ArrayIterator {
     /// [spec]: https://tc39.es/ecma262/#sec-createarrayiterator
     pub(crate) fn create_array_iterator(
         context: &Context,
-        array: Value,
+        array: JsValue,
         kind: ArrayIterationKind,
-    ) -> Value {
-        let array_iterator = Value::new_object(context);
+    ) -> JsValue {
+        let array_iterator = JsValue::new_object(context);
         array_iterator.set_data(ObjectData::ArrayIterator(Self::new(array, kind)));
         array_iterator
             .as_object()
@@ -68,13 +68,17 @@ impl ArrayIterator {
     ///  - [ECMA reference][spec]
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-%arrayiteratorprototype%.next
-    pub(crate) fn next(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
-        if let Value::Object(ref object) = this {
+    pub(crate) fn next(this: &JsValue, _: &[JsValue], context: &mut Context) -> Result<JsValue> {
+        if let JsValue::Object(ref object) = this {
             let mut object = object.borrow_mut();
             if let Some(array_iterator) = object.as_array_iterator_mut() {
                 let index = array_iterator.next_index;
                 if array_iterator.array.is_undefined() {
-                    return Ok(create_iter_result_object(context, Value::undefined(), true));
+                    return Ok(create_iter_result_object(
+                        context,
+                        JsValue::undefined(),
+                        true,
+                    ));
                 }
                 let len = array_iterator
                     .array
@@ -83,8 +87,12 @@ impl ArrayIterator {
                     .ok_or_else(|| context.construct_type_error("Not an array"))?
                     as u32;
                 if array_iterator.next_index >= len {
-                    array_iterator.array = Value::undefined();
-                    return Ok(create_iter_result_object(context, Value::undefined(), true));
+                    array_iterator.array = JsValue::undefined();
+                    return Ok(create_iter_result_object(
+                        context,
+                        JsValue::undefined(),
+                        true,
+                    ));
                 }
                 array_iterator.next_index = index + 1;
                 match array_iterator.kind {
@@ -98,7 +106,7 @@ impl ArrayIterator {
                     ArrayIterationKind::KeyAndValue => {
                         let element_value = array_iterator.array.get_field(index, context)?;
                         let result = Array::constructor(
-                            &Value::new_object(context),
+                            &JsValue::new_object(context),
                             &[index.into(), element_value],
                             context,
                         )?;
@@ -119,7 +127,7 @@ impl ArrayIterator {
     ///  - [ECMA reference][spec]
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-%arrayiteratorprototype%-object
-    pub(crate) fn create_prototype(context: &mut Context, iterator_prototype: Value) -> GcObject {
+    pub(crate) fn create_prototype(context: &mut Context, iterator_prototype: JsValue) -> GcObject {
         let _timer = BoaProfiler::global().start_event(Self::NAME, "init");
 
         // Create prototype

boa/src/builtins/array/mod.rs

@@ -20,7 +20,7 @@ use crate::{
     object::{ConstructorBuilder, FunctionBuilder, GcObject, ObjectData, PROTOTYPE},
     property::{Attribute, PropertyDescriptor},
     symbol::WellKnownSymbols,
-    value::{IntegerOrInfinity, Value},
+    value::{IntegerOrInfinity, JsValue},
     BoaProfiler, Context, JsString, Result,
 };
 use std::cmp::{max, min};
@@ -36,7 +36,7 @@ impl BuiltIn for Array {
         Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE
     }
 
-    fn init(context: &mut Context) -> (&'static str, Value, Attribute) {
+    fn init(context: &mut Context) -> (&'static str, JsValue, Attribute) {
         let _timer = BoaProfiler::global().start_event(Self::NAME, "init");
 
         let symbol_iterator = WellKnownSymbols::iterator();
@@ -119,7 +119,11 @@ impl BuiltIn for Array {
 impl Array {
     const LENGTH: usize = 1;
 
-    fn constructor(new_target: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    fn constructor(
+        new_target: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         // If NewTarget is undefined, let newTarget be the active function object; else let newTarget be NewTarget.
         // 2. Let proto be ? GetPrototypeFromConstructor(newTarget, "%Array.prototype%").
         let prototype = new_target
@@ -160,7 +164,7 @@ impl Array {
                 // i. Let intLen be ! ToUint32(len).
                 let int_len = len.to_u32(context).unwrap();
                 // ii. If SameValueZero(intLen, len) is false, throw a RangeError exception.
-                if !Value::same_value_zero(&int_len.into(), len) {
+                if !JsValue::same_value_zero(&int_len.into(), len) {
                     return Err(context.construct_range_error("invalid array length"));
                 }
                 int_len
@@ -240,8 +244,8 @@ impl Array {
     }
 
     /// Creates a new `Array` instance.
-    pub(crate) fn new_array(context: &Context) -> Value {
-        let array = Value::new_object(context);
+    pub(crate) fn new_array(context: &Context) -> JsValue {
+        let array = JsValue::new_object(context);
         array.set_data(ObjectData::Array);
         array
             .as_object()
@@ -264,10 +268,10 @@ impl Array {
     /// `array_obj` can be any array with prototype already set (it will be wiped and
     /// recreated from `array_contents`)
     pub(crate) fn construct_array(
-        array_obj: &Value,
-        array_contents: &[Value],
+        array_obj: &JsValue,
+        array_contents: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         let array_obj_ptr = array_obj.clone();
 
         // Wipe existing contents of the array object
@@ -305,7 +309,7 @@ impl Array {
     /// Returns a Boolean valued property that if `true` indicates that
     /// an object should be flattened to its array elements
     /// by `Array.prototype.concat`.
-    fn is_concat_spreadable(this: &Value, context: &mut Context) -> Result<bool> {
+    fn is_concat_spreadable(this: &JsValue, context: &mut Context) -> Result<bool> {
         // 1. If Type(O) is not Object, return false.
         if !this.is_object() {
             return Ok(false);
@@ -334,7 +338,7 @@ impl Array {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-get-array-@@species
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/@@species
-    fn get_species(this: &Value, _: &[Value], _: &mut Context) -> Result<Value> {
+    fn get_species(this: &JsValue, _: &[JsValue], _: &mut Context) -> Result<JsValue> {
         // 1. Return the this value.
         Ok(this.clone())
     }
@@ -369,7 +373,7 @@ impl Array {
             let c = c.get(WellKnownSymbols::species(), context)?;
             // 5.b. If C is null, set C to undefined.
             if c.is_null_or_undefined() {
-                Value::undefined()
+                JsValue::undefined()
             } else {
                 c
             }
@@ -389,7 +393,7 @@ impl Array {
             }
             // 8. Return ? Construct(C, « 𝔽(length) »).
             Ok(
-                c.construct(&[Value::from(length)], &c.clone().into(), context)?
+                c.construct(&[JsValue::new(length)], &c.clone().into(), context)?
                     .as_object()
                     .unwrap(),
             )
@@ -401,10 +405,10 @@ impl Array {
     /// Utility function which takes an existing array object and puts additional
     /// values on the end, correctly rewriting the length
     pub(crate) fn add_to_array_object(
-        array_ptr: &Value,
-        add_values: &[Value],
+        array_ptr: &JsValue,
+        add_values: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         let orig_length = array_ptr.get_field("length", context)?.to_length(context)?;
 
         for (n, value) in add_values.iter().enumerate() {
@@ -421,7 +425,7 @@ impl Array {
 
         array_ptr.set_field(
             "length",
-            Value::from(orig_length.wrapping_add(add_values.len())),
+            JsValue::new(orig_length.wrapping_add(add_values.len())),
             false,
             context,
         )?;
@@ -440,10 +444,10 @@ impl Array {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-array.isarray
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/isArray
-    pub(crate) fn is_array(_: &Value, args: &[Value], _: &mut Context) -> Result<Value> {
+    pub(crate) fn is_array(_: &JsValue, args: &[JsValue], _: &mut Context) -> Result<JsValue> {
         match args.get(0).and_then(|x| x.as_object()) {
-            Some(object) => Ok(Value::from(object.borrow().is_array())),
-            None => Ok(Value::from(false)),
+            Some(object) => Ok(JsValue::new(object.borrow().is_array())),
+            None => Ok(JsValue::new(false)),
         }
     }
 
@@ -458,7 +462,7 @@ impl Array {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-array.of
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/of
-    pub(crate) fn of(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn of(this: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         // 1. Let len be the number of elements in items.
         // 2. Let lenNumber be 𝔽(len).
         let len = args.len();
@@ -505,7 +509,11 @@ impl Array {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-array.prototype.concat
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/concat
-    pub(crate) fn concat(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn concat(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         // 1. Let O be ? ToObject(this value).
         let obj = this.to_object(context)?;
         // 2. Let A be ? ArraySpeciesCreate(O, 0).
@@ -514,7 +522,7 @@ impl Array {
         let mut n = 0;
         // 4. Prepend O to items.
         // 5. For each element E of items, do
-        for item in [Value::from(obj)].iter().chain(args.iter()) {
+        for item in [JsValue::new(obj)].iter().chain(args.iter()) {
             // a. Let spreadable be ? IsConcatSpreadable(E).
             let spreadable = Self::is_concat_spreadable(item, context)?;
             // b. If spreadable is true, then
@@ -565,7 +573,7 @@ impl Array {
         arr.set("length", n, true, context)?;
 
         // 7. Return A.
-        Ok(Value::from(arr))
+        Ok(JsValue::new(arr))
     }
 
     /// `Array.prototype.push( ...items )`
@@ -580,7 +588,7 @@ impl Array {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-array.prototype.push
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/push
-    pub(crate) fn push(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn push(this: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         // 1. Let O be ? ToObject(this value).
         let o = this.to_object(context)?;
         // 2. Let len be ? LengthOfArrayLike(O).
@@ -616,7 +624,7 @@ impl Array {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-array.prototype.pop
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/pop
-    pub(crate) fn pop(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn pop(this: &JsValue, _: &[JsValue], context: &mut Context) -> Result<JsValue> {
         // 1. Let O be ? ToObject(this value).
         let o = this.to_object(context)?;
         // 2. Let len be ? LengthOfArrayLike(O).
@@ -626,7 +634,7 @@ impl Array {
             // a. Perform ? Set(O, "length", +0𝔽, true).
             o.set("length", 0, true, context)?;
             // b. Return undefined.
-            Ok(Value::undefined())
+            Ok(JsValue::undefined())
         // 4. Else,
         } else {
             // a. Assert: len > 0.
@@ -655,7 +663,11 @@ impl Array {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-array.prototype.foreach
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach
-    pub(crate) fn for_each(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn for_each(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         // 1. Let O be ? ToObject(this value).
         let o = this.to_object(context)?;
         // 2. Let len be ? LengthOfArrayLike(O).
@@ -663,7 +675,7 @@ impl Array {
         // 3. If IsCallable(callbackfn) is false, throw a TypeError exception.
         let callback = if let Some(arg) = args
             .get(0)
-            .and_then(Value::as_object)
+            .and_then(JsValue::as_object)
             .filter(GcObject::is_callable)
         {
             arg
@@ -682,13 +694,13 @@ impl Array {
                 // i. Let kValue be ? Get(O, Pk).
                 let k_value = o.get(pk, context)?;
                 // ii. Perform ? Call(callbackfn, thisArg, « kValue, 𝔽(k), O »).
-                let this_arg = args.get(1).cloned().unwrap_or_else(Value::undefined);
+                let this_arg = args.get(1).cloned().unwrap_or_else(JsValue::undefined);
                 callback.call(&this_arg, &[k_value, k.into(), o.clone().into()], context)?;
             }
             // d. Set k to k + 1.
         }
         // 6. Return undefined.
-        Ok(Value::undefined())
+        Ok(JsValue::undefined())
     }
 
     /// `Array.prototype.join( separator )`
@@ -703,7 +715,7 @@ impl Array {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-array.prototype.join
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/join
-    pub(crate) fn join(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn join(this: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         // 1. Let O be ? ToObject(this value).
         let o = this.to_object(context)?;
         // 2. Let len be ? LengthOfArrayLike(O).
@@ -754,7 +766,11 @@ impl Array {
     /// [spec]: https://tc39.es/ecma262/#sec-array.prototype.tostring
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/toString
     #[allow(clippy::wrong_self_convention)]
-    pub(crate) fn to_string(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn to_string(
+        this: &JsValue,
+        _: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         // 1. Let array be ? ToObject(this value).
         let array = this.to_object(context)?;
         // 2. Let func be ? Get(array, "join").
@@ -780,7 +796,7 @@ impl Array {
     /// [spec]: https://tc39.es/ecma262/#sec-array.prototype.reverse
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reverse
     #[allow(clippy::else_if_without_else)]
-    pub(crate) fn reverse(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn reverse(this: &JsValue, _: &[JsValue], context: &mut Context) -> Result<JsValue> {
         // 1. Let O be ? ToObject(this value).
         let o = this.to_object(context)?;
         // 2. Let len be ? LengthOfArrayLike(O).
@@ -798,7 +814,7 @@ impl Array {
             // d. Let lowerExists be ? HasProperty(O, lowerP).
             let lower_exists = o.has_property(lower, context)?;
             // e. If lowerExists is true, then
-            let mut lower_value = Value::undefined();
+            let mut lower_value = JsValue::undefined();
             if lower_exists {
                 // i. Let lowerValue be ? Get(O, lowerP).
                 lower_value = o.get(lower, context)?;
@@ -806,7 +822,7 @@ impl Array {
             // f. Let upperExists be ? HasProperty(O, upperP).
             let upper_exists = o.has_property(upper, context)?;
             // g. If upperExists is true, then
-            let mut upper_value = Value::undefined();
+            let mut upper_value = JsValue::undefined();
             if upper_exists {
                 // i. Let upperValue be ? Get(O, upperP).
                 upper_value = o.get(upper, context)?;
@@ -857,7 +873,7 @@ impl Array {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-array.prototype.shift
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/shift
-    pub(crate) fn shift(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn shift(this: &JsValue, _: &[JsValue], context: &mut Context) -> Result<JsValue> {
         // 1. Let O be ? ToObject(this value).
         let o = this.to_object(context)?;
         // 2. Let len be ? LengthOfArrayLike(O).
@@ -867,7 +883,7 @@ impl Array {
             // a. Perform ? Set(O, "length", +0𝔽, true).
             o.set("length", 0, true, context)?;
             // b. Return undefined.
-            return Ok(Value::undefined());
+            return Ok(JsValue::undefined());
         }
         // 4. Let first be ? Get(O, "0").
         let first = o.get(0, context)?;
@@ -914,7 +930,11 @@ impl Array {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-array.prototype.unshift
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/unshift
-    pub(crate) fn unshift(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn unshift(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         // 1. Let O be ? ToObject(this value).
         let o = this.to_object(context)?;
         // 2. Let len be ? LengthOfArrayLike(O).
@@ -981,7 +1001,11 @@ impl Array {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-array.prototype.every
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/every
-    pub(crate) fn every(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn every(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         // 1. Let O be ? ToObject(this value).
         let o = this.to_object(context)?;
         // 2. Let len be ? LengthOfArrayLike(O).
@@ -989,7 +1013,7 @@ impl Array {
         // 3. If IsCallable(callbackfn) is false, throw a TypeError exception.
         let callback = if let Some(arg) = args
             .get(0)
-            .and_then(Value::as_object)
+            .and_then(JsValue::as_object)
             .filter(GcObject::is_callable)
         {
             arg
@@ -1015,13 +1039,13 @@ impl Array {
                     .to_boolean();
                 // iii. If testResult is false, return false.
                 if !test_result {
-                    return Ok(Value::from(false));
+                    return Ok(JsValue::new(false));
                 }
             }
             // d. Set k to k + 1.
         }
         // 6. Return true.
-        Ok(Value::from(true))
+        Ok(JsValue::new(true))
     }
 
     /// `Array.prototype.map( callback, [ thisArg ] )`
@@ -1035,7 +1059,7 @@ impl Array {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-array.prototype.map
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map
-    pub(crate) fn map(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn map(this: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         // 1. Let O be ? ToObject(this value).
         let o = this.to_object(context)?;
         // 2. Let len be ? LengthOfArrayLike(O).
@@ -1081,7 +1105,11 @@ impl Array {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-array.prototype.indexof
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/indexOf
-    pub(crate) fn index_of(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn index_of(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         // 1. Let O be ? ToObject(this value).
         let o = this.to_object(context)?;
 
@@ -1090,7 +1118,7 @@ impl Array {
 
         // 3. If len is 0, return -1𝔽.
         if len == 0 {
-            return Ok(Value::from(-1));
+            return Ok(JsValue::new(-1));
         }
 
         // 4. Let n be ? ToIntegerOrInfinity(fromIndex).
@@ -1102,7 +1130,7 @@ impl Array {
         // 5. Assert: If fromIndex is undefined, then n is 0.
         let n = match n {
             // 6. If n is +∞, return -1𝔽.
-            IntegerOrInfinity::PositiveInfinity => return Ok(Value::from(-1)),
+            IntegerOrInfinity::PositiveInfinity => return Ok(JsValue::new(-1)),
             // 7. Else if n is -∞, set n to 0.
             IntegerOrInfinity::NegativeInfinity => 0,
             IntegerOrInfinity::Integer(value) => value,
@@ -1136,14 +1164,14 @@ impl Array {
                 // ii. Let same be IsStrictlyEqual(searchElement, elementK).
                 // iii. If same is true, return 𝔽(k).
                 if search_element.strict_equals(&element_k) {
-                    return Ok(Value::from(k));
+                    return Ok(JsValue::new(k));
                 }
             }
             // c. Set k to k + 1.
             k += 1;
         }
         // 11. Return -1𝔽.
-        Ok(Value::from(-1))
+        Ok(JsValue::new(-1))
     }
 
     /// `Array.prototype.lastIndexOf( searchElement[, fromIndex ] )`
@@ -1165,10 +1193,10 @@ impl Array {
     /// [spec]: https://tc39.es/ecma262/#sec-array.prototype.lastindexof
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/lastIndexOf
     pub(crate) fn last_index_of(
-        this: &Value,
-        args: &[Value],
+        this: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         // 1. Let O be ? ToObject(this value).
         let o = this.to_object(context)?;
 
@@ -1177,7 +1205,7 @@ impl Array {
 
         // 3. If len is 0, return -1𝔽.
         if len == 0 {
-            return Ok(Value::from(-1));
+            return Ok(JsValue::new(-1));
         }
 
         // 4. If fromIndex is present, let n be ? ToIntegerOrInfinity(fromIndex); else let n be len - 1.
@@ -1189,7 +1217,7 @@ impl Array {
 
         let mut k = match n {
             // 5. If n is -∞, return -1𝔽.
-            IntegerOrInfinity::NegativeInfinity => return Ok(Value::from(-1)),
+            IntegerOrInfinity::NegativeInfinity => return Ok(JsValue::new(-1)),
             // 6. If n ≥ 0, then
             //     a. Let k be min(n, len - 1).
             IntegerOrInfinity::Integer(n) if n >= 0 => min(n, len - 1),
@@ -1211,15 +1239,15 @@ impl Array {
                 let element_k = o.get(k, context)?;
                 // ii. Let same be IsStrictlyEqual(searchElement, elementK).
                 // iii. If same is true, return 𝔽(k).
-                if Value::strict_equals(&search_element, &element_k) {
-                    return Ok(Value::from(k));
+                if JsValue::strict_equals(&search_element, &element_k) {
+                    return Ok(JsValue::new(k));
                 }
             }
             // c. Set k to k - 1.
             k -= 1;
         }
         // 9. Return -1𝔽.
-        Ok(Value::from(-1))
+        Ok(JsValue::new(-1))
     }
 
     /// `Array.prototype.find( callback, [thisArg] )`
@@ -1234,7 +1262,7 @@ impl Array {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-array.prototype.find
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/find
-    pub(crate) fn find(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn find(this: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         // 1. Let O be ? ToObject(this value).
         let o = this.to_object(context)?;
 
@@ -1242,7 +1270,7 @@ impl Array {
         let len = o.length_of_array_like(context)?;
 
         // 3. If IsCallable(predicate) is false, throw a TypeError exception.
-        let predicate = match args.get(0).and_then(Value::as_object) {
+        let predicate = match args.get(0).and_then(JsValue::as_object) {
             Some(predicate) if predicate.is_callable() => predicate,
             _ => {
                 return context.throw_type_error("Array.prototype.find: predicate is not callable")
@@ -1275,7 +1303,7 @@ impl Array {
             k += 1;
         }
         // 6. Return undefined.
-        Ok(Value::undefined())
+        Ok(JsValue::undefined())
     }
 
     /// `Array.prototype.findIndex( predicate [ , thisArg ] )`
@@ -1290,7 +1318,11 @@ impl Array {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-array.prototype.findindex
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/findIndex
-    pub(crate) fn find_index(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn find_index(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         // 1. Let O be ? ToObject(this value).
         let o = this.to_object(context)?;
 
@@ -1298,7 +1330,7 @@ impl Array {
         let len = o.length_of_array_like(context)?;
 
         // 3. If IsCallable(predicate) is false, throw a TypeError exception.
-        let predicate = match args.get(0).and_then(Value::as_object) {
+        let predicate = match args.get(0).and_then(JsValue::as_object) {
             Some(predicate) if predicate.is_callable() => predicate,
             _ => {
                 return context
@@ -1322,13 +1354,13 @@ impl Array {
                 .to_boolean();
             // d. If testResult is true, return 𝔽(k).
             if test_result {
-                return Ok(Value::from(k));
+                return Ok(JsValue::new(k));
             }
             // e. Set k to k + 1.
             k += 1;
         }
         // 6. Return -1𝔽.
-        Ok(Value::from(-1))
+        Ok(JsValue::new(-1))
     }
 
     /// `Array.prototype.flat( [depth] )`
@@ -1342,7 +1374,7 @@ impl Array {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-array.prototype.flat
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/flat
-    pub(crate) fn flat(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn flat(this: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         // 1. Let O be ToObject(this value)
         let o = this.to_object(context)?;
 
@@ -1374,7 +1406,7 @@ impl Array {
             0,
             depth_num,
             None,
-            &Value::undefined(),
+            &JsValue::undefined(),
             context,
         )?;
 
@@ -1394,7 +1426,11 @@ impl Array {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-array.prototype.flatMap
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/flatMap
-    pub(crate) fn flat_map(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn flat_map(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         // 1. Let O be ToObject(this value)
         let o = this.to_object(context)?;
 
@@ -1440,7 +1476,7 @@ impl Array {
         start: u64,
         depth: u64,
         mapper_function: Option<GcObject>,
-        this_arg: &Value,
+        this_arg: &JsValue,
         context: &mut Context,
     ) -> Result<u64> {
         // 1. Assert target is Object
@@ -1512,7 +1548,7 @@ impl Array {
                         target_index,
                         new_depth,
                         None,
-                        &Value::undefined(),
+                        &JsValue::undefined(),
                         context,
                     )?;
 
@@ -1550,7 +1586,7 @@ impl Array {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-array.prototype.fill
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/fill
-    pub(crate) fn fill(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn fill(this: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         // 1. Let O be ? ToObject(this value).
         let o = this.to_object(context)?;
 
@@ -1595,10 +1631,10 @@ impl Array {
     /// [spec]: https://tc39.es/ecma262/#sec-array.prototype.includes
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/includes
     pub(crate) fn includes_value(
-        this: &Value,
-        args: &[Value],
+        this: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         // 1. Let O be ? ToObject(this value).
         let o = this.to_object(context)?;
 
@@ -1607,7 +1643,7 @@ impl Array {
 
         // 3. If len is 0, return false.
         if len == 0 {
-            return Ok(Value::from(false));
+            return Ok(JsValue::new(false));
         }
 
         // 4. Let n be ? ToIntegerOrInfinity(fromIndex).
@@ -1620,7 +1656,7 @@ impl Array {
         // 6. If n is +∞, return false.
         // 7. Else if n is -∞, set n to 0.
         let n = match n {
-            IntegerOrInfinity::PositiveInfinity => return Ok(Value::from(false)),
+            IntegerOrInfinity::PositiveInfinity => return Ok(JsValue::new(false)),
             IntegerOrInfinity::NegativeInfinity => 0,
             IntegerOrInfinity::Integer(value) => value,
         };
@@ -1647,14 +1683,14 @@ impl Array {
             // a. Let elementK be ? Get(O, ! ToString(𝔽(k))).
             let element_k = o.get(k, context)?;
             // b. If SameValueZero(searchElement, elementK) is true, return true.
-            if Value::same_value_zero(&search_element, &element_k) {
-                return Ok(Value::from(true));
+            if JsValue::same_value_zero(&search_element, &element_k) {
+                return Ok(JsValue::new(true));
             }
             // c. Set k to k + 1.
             k += 1;
         }
         // 11. Return false.
-        Ok(Value::from(false))
+        Ok(JsValue::new(false))
     }
 
     /// `Array.prototype.slice( [begin[, end]] )`
@@ -1671,7 +1707,11 @@ impl Array {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-array.prototype.slice
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/slice
-    pub(crate) fn slice(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn slice(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         // 1. Let O be ? ToObject(this value).
         let o = this.to_object(context)?;
 
@@ -1735,7 +1775,11 @@ impl Array {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-array.prototype.filter
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter
-    pub(crate) fn filter(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn filter(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         // 1. Let O be ? ToObject(this value).
         let o = this.to_object(context)?;
 
@@ -1752,7 +1796,7 @@ impl Array {
                     "missing argument 0 when calling function Array.prototype.filter",
                 )
             })?;
-        let this_val = args.get(1).cloned().unwrap_or_else(Value::undefined);
+        let this_val = args.get(1).cloned().unwrap_or_else(JsValue::undefined);
 
         if !callback.is_callable() {
             return context.throw_type_error("the callback must be callable");
@@ -1773,7 +1817,7 @@ impl Array {
                 // i. Let kValue be ? Get(O, Pk).
                 let element = o.get(idx, context)?;
 
-                let args = [element.clone(), Value::from(idx), Value::from(o.clone())];
+                let args = [element.clone(), JsValue::new(idx), JsValue::new(o.clone())];
 
                 // ii. Let selected be ! ToBoolean(? Call(callbackfn, thisArg, « kValue, 𝔽(k), O »)).
                 let selected = callback.call(&this_val, &args, context)?.to_boolean();
@@ -1807,7 +1851,7 @@ impl Array {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-array.prototype.some
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/some
-    pub(crate) fn some(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn some(this: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         // 1. Let O be ? ToObject(this value).
         let o = this.to_object(context)?;
         // 2. Let len be ? LengthOfArrayLike(O).
@@ -1815,7 +1859,7 @@ impl Array {
         // 3. If IsCallable(callbackfn) is false, throw a TypeError exception.
         let callback = if let Some(arg) = args
             .get(0)
-            .and_then(Value::as_object)
+            .and_then(JsValue::as_object)
             .filter(GcObject::is_callable)
         {
             arg
@@ -1840,13 +1884,13 @@ impl Array {
                     .to_boolean();
                 // iii. If testResult is true, return true.
                 if test_result {
-                    return Ok(Value::from(true));
+                    return Ok(JsValue::new(true));
                 }
             }
             // d. Set k to k + 1.
         }
         // 6. Return false.
-        Ok(Value::from(false))
+        Ok(JsValue::new(false))
     }
 
     /// `Array.prototype.reduce( callbackFn [ , initialValue ] )`
@@ -1857,7 +1901,11 @@ impl Array {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-array.prototype.reduce
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reduce
-    pub(crate) fn reduce(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn reduce(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         // 1. Let O be ? ToObject(this value).
         let o = this.to_object(context)?;
 
@@ -1865,7 +1913,7 @@ impl Array {
         let len = o.length_of_array_like(context)?;
 
         // 3. If IsCallable(callbackfn) is false, throw a TypeError exception.
-        let callback = match args.get(0).and_then(Value::as_object) {
+        let callback = match args.get(0).and_then(JsValue::as_object) {
             Some(callback) if callback.is_callable() => callback,
             _ => {
                 return context
@@ -1883,7 +1931,7 @@ impl Array {
         // 5. Let k be 0.
         let mut k = 0;
         // 6. Let accumulator be undefined.
-        let mut accumulator = Value::undefined();
+        let mut accumulator = JsValue::undefined();
 
         // 7. If initialValue is present, then
         if let Some(initial_value) = args.get(1) {
@@ -1927,7 +1975,7 @@ impl Array {
                 let k_value = o.get(pk, context)?;
                 // ii. Set accumulator to ? Call(callbackfn, undefined, « accumulator, kValue, 𝔽(k), O »).
                 accumulator = callback.call(
-                    &Value::undefined(),
+                    &JsValue::undefined(),
                     &[accumulator, k_value, k.into(), o.clone().into()],
                     context,
                 )?;
@@ -1952,10 +2000,10 @@ impl Array {
     /// [spec]: https://tc39.es/ecma262/#sec-array.prototype.reduceright
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reduceRight
     pub(crate) fn reduce_right(
-        this: &Value,
-        args: &[Value],
+        this: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         // 1. Let O be ? ToObject(this value).
         let o = this.to_object(context)?;
 
@@ -1963,7 +2011,7 @@ impl Array {
         let len = o.length_of_array_like(context)?;
 
         // 3. If IsCallable(callbackfn) is false, throw a TypeError exception.
-        let callback = match args.get(0).and_then(Value::as_object) {
+        let callback = match args.get(0).and_then(JsValue::as_object) {
             Some(callback) if callback.is_callable() => callback,
             _ => {
                 return context.throw_type_error(
@@ -1982,7 +2030,7 @@ impl Array {
         // 5. Let k be len - 1.
         let mut k = len as i64 - 1;
         // 6. Let accumulator be undefined.
-        let mut accumulator = Value::undefined();
+        let mut accumulator = JsValue::undefined();
         // 7. If initialValue is present, then
         if let Some(initial_value) = args.get(1) {
             // a. Set accumulator to initialValue.
@@ -2025,7 +2073,7 @@ impl Array {
                 let k_value = o.get(pk, context)?;
                 // ii. Set accumulator to ? Call(callbackfn, undefined, « accumulator, kValue, 𝔽(k), O »).
                 accumulator = callback.call(
-                    &Value::undefined(),
+                    &JsValue::undefined(),
                     &[accumulator.clone(), k_value, k.into(), o.clone().into()],
                     context,
                 )?;
@@ -2050,10 +2098,10 @@ impl Array {
     /// [spec]: https://tc39.es/ecma262/#sec-array.prototype.copywithin
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/copyWithin
     pub(crate) fn copy_within(
-        this: &Value,
-        args: &[Value],
+        this: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         // 1. Let O be ? ToObject(this value).
         let o = this.to_object(context)?;
 
@@ -2139,7 +2187,7 @@ impl Array {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-array.prototype.values
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/values
-    pub(crate) fn values(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn values(this: &JsValue, _: &[JsValue], context: &mut Context) -> Result<JsValue> {
         Ok(ArrayIterator::create_array_iterator(
             context,
             this.clone(),
@@ -2157,7 +2205,7 @@ impl Array {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-array.prototype.values
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/values
-    pub(crate) fn keys(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn keys(this: &JsValue, _: &[JsValue], context: &mut Context) -> Result<JsValue> {
         Ok(ArrayIterator::create_array_iterator(
             context,
             this.clone(),
@@ -2175,7 +2223,7 @@ impl Array {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-array.prototype.values
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/values
-    pub(crate) fn entries(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn entries(this: &JsValue, _: &[JsValue], context: &mut Context) -> Result<JsValue> {
         Ok(ArrayIterator::create_array_iterator(
             context,
             this.clone(),
@@ -2186,7 +2234,7 @@ impl Array {
     /// Represents the algorithm to calculate `relativeStart` (or `k`) in array functions.
     pub(super) fn get_relative_start(
         context: &mut Context,
-        arg: Option<&Value>,
+        arg: Option<&JsValue>,
         len: usize,
     ) -> Result<usize> {
         // 1. Let relativeStart be ? ToIntegerOrInfinity(start).
@@ -2211,10 +2259,10 @@ impl Array {
     /// Represents the algorithm to calculate `relativeEnd` (or `final`) in array functions.
     pub(super) fn get_relative_end(
         context: &mut Context,
-        arg: Option<&Value>,
+        arg: Option<&JsValue>,
         len: usize,
     ) -> Result<usize> {
-        let default_value = Value::undefined();
+        let default_value = JsValue::undefined();
         let value = arg.unwrap_or(&default_value);
         // 1. If end is undefined, let relativeEnd be len [and return it]
         if value.is_undefined() {

boa/src/builtins/array/tests.rs

@@ -1,6 +1,6 @@
 use super::Array;
 use crate::builtins::Number;
-use crate::{forward, Context, Value};
+use crate::{forward, Context, JsValue};
 
 #[test]
 fn is_array() {
@@ -13,58 +13,58 @@ fn is_array() {
     context.eval(init).unwrap();
     assert_eq!(
         context.eval("Array.isArray(empty)").unwrap(),
-        Value::Boolean(true)
+        JsValue::new(true)
     );
     assert_eq!(
         context.eval("Array.isArray(new_arr)").unwrap(),
-        Value::Boolean(true)
+        JsValue::new(true)
     );
     assert_eq!(
         context.eval("Array.isArray(many)").unwrap(),
-        Value::Boolean(true)
+        JsValue::new(true)
     );
     assert_eq!(
         context.eval("Array.isArray([1, 2, 3])").unwrap(),
-        Value::Boolean(true)
+        JsValue::new(true)
     );
     assert_eq!(
         context.eval("Array.isArray([])").unwrap(),
-        Value::Boolean(true)
+        JsValue::new(true)
     );
     assert_eq!(
         context.eval("Array.isArray({})").unwrap(),
-        Value::Boolean(false)
+        JsValue::new(false)
     );
     // assert_eq!(context.eval("Array.isArray(new Array)"), "true");
     assert_eq!(
         context.eval("Array.isArray()").unwrap(),
-        Value::Boolean(false)
+        JsValue::new(false)
     );
     assert_eq!(
         context
             .eval("Array.isArray({ constructor: Array })")
             .unwrap(),
-        Value::Boolean(false)
+        JsValue::new(false)
     );
     assert_eq!(
         context
             .eval("Array.isArray({ push: Array.prototype.push, concat: Array.prototype.concat })")
             .unwrap(),
-        Value::Boolean(false)
+        JsValue::new(false)
     );
     assert_eq!(
         context.eval("Array.isArray(17)").unwrap(),
-        Value::Boolean(false)
+        JsValue::new(false)
     );
     assert_eq!(
         context
             .eval("Array.isArray({ __proto__: Array.prototype })")
             .unwrap(),
-        Value::Boolean(false)
+        JsValue::new(false)
     );
     assert_eq!(
         context.eval("Array.isArray({ length: 0 })").unwrap(),
-        Value::Boolean(false)
+        JsValue::new(false)
     );
 }
 
@@ -109,12 +109,12 @@ fn of() {
         .unwrap();
     assert_eq!(
         context.eval("a instanceof Date").unwrap(),
-        Value::from(true)
+        JsValue::new(true)
     );
-    assert_eq!(context.eval("a[0]").unwrap(), Value::from("a"));
-    assert_eq!(context.eval("a[1]").unwrap(), Value::undefined());
-    assert_eq!(context.eval("a[2]").unwrap(), Value::from(3));
-    assert_eq!(context.eval("a.length").unwrap(), Value::from(3));
+    assert_eq!(context.eval("a[0]").unwrap(), JsValue::new("a"));
+    assert_eq!(context.eval("a[1]").unwrap(), JsValue::undefined());
+    assert_eq!(context.eval("a[2]").unwrap(), JsValue::new(3));
+    assert_eq!(context.eval("a.length").unwrap(), JsValue::new(3));
 }
 
 #[ignore]
@@ -1424,47 +1424,47 @@ fn get_relative_start() {
 
     assert_eq!(Array::get_relative_start(&mut context, None, 10), Ok(0));
     assert_eq!(
-        Array::get_relative_start(&mut context, Some(&Value::undefined()), 10),
+        Array::get_relative_start(&mut context, Some(&JsValue::undefined()), 10),
         Ok(0)
     );
     assert_eq!(
-        Array::get_relative_start(&mut context, Some(&Value::from(f64::NEG_INFINITY)), 10),
+        Array::get_relative_start(&mut context, Some(&JsValue::new(f64::NEG_INFINITY)), 10),
         Ok(0)
     );
     assert_eq!(
-        Array::get_relative_start(&mut context, Some(&Value::from(f64::INFINITY)), 10),
+        Array::get_relative_start(&mut context, Some(&JsValue::new(f64::INFINITY)), 10),
         Ok(10)
     );
     assert_eq!(
-        Array::get_relative_start(&mut context, Some(&Value::from(-1)), 10),
+        Array::get_relative_start(&mut context, Some(&JsValue::new(-1)), 10),
         Ok(9)
     );
     assert_eq!(
-        Array::get_relative_start(&mut context, Some(&Value::from(1)), 10),
+        Array::get_relative_start(&mut context, Some(&JsValue::new(1)), 10),
         Ok(1)
     );
     assert_eq!(
-        Array::get_relative_start(&mut context, Some(&Value::from(-11)), 10),
+        Array::get_relative_start(&mut context, Some(&JsValue::new(-11)), 10),
         Ok(0)
     );
     assert_eq!(
-        Array::get_relative_start(&mut context, Some(&Value::from(11)), 10),
+        Array::get_relative_start(&mut context, Some(&JsValue::new(11)), 10),
         Ok(10)
     );
     assert_eq!(
-        Array::get_relative_start(&mut context, Some(&Value::from(f64::MIN)), 10),
+        Array::get_relative_start(&mut context, Some(&JsValue::new(f64::MIN)), 10),
         Ok(0)
     );
     assert_eq!(
         Array::get_relative_start(
             &mut context,
-            Some(&Value::from(Number::MIN_SAFE_INTEGER)),
+            Some(&JsValue::new(Number::MIN_SAFE_INTEGER)),
             10
         ),
         Ok(0)
     );
     assert_eq!(
-        Array::get_relative_start(&mut context, Some(&Value::from(f64::MAX)), 10),
+        Array::get_relative_start(&mut context, Some(&JsValue::new(f64::MAX)), 10),
         Ok(10)
     );
 
@@ -1472,7 +1472,7 @@ fn get_relative_start() {
     assert_eq!(
         Array::get_relative_start(
             &mut context,
-            Some(&Value::from(Number::MAX_SAFE_INTEGER)),
+            Some(&JsValue::new(Number::MAX_SAFE_INTEGER)),
             10
         ),
         Ok(10)
@@ -1485,47 +1485,47 @@ fn get_relative_end() {
 
     assert_eq!(Array::get_relative_end(&mut context, None, 10), Ok(10));
     assert_eq!(
-        Array::get_relative_end(&mut context, Some(&Value::undefined()), 10),
+        Array::get_relative_end(&mut context, Some(&JsValue::undefined()), 10),
         Ok(10)
     );
     assert_eq!(
-        Array::get_relative_end(&mut context, Some(&Value::from(f64::NEG_INFINITY)), 10),
+        Array::get_relative_end(&mut context, Some(&JsValue::new(f64::NEG_INFINITY)), 10),
         Ok(0)
     );
     assert_eq!(
-        Array::get_relative_end(&mut context, Some(&Value::from(f64::INFINITY)), 10),
+        Array::get_relative_end(&mut context, Some(&JsValue::new(f64::INFINITY)), 10),
         Ok(10)
     );
     assert_eq!(
-        Array::get_relative_end(&mut context, Some(&Value::from(-1)), 10),
+        Array::get_relative_end(&mut context, Some(&JsValue::new(-1)), 10),
         Ok(9)
     );
     assert_eq!(
-        Array::get_relative_end(&mut context, Some(&Value::from(1)), 10),
+        Array::get_relative_end(&mut context, Some(&JsValue::new(1)), 10),
         Ok(1)
     );
     assert_eq!(
-        Array::get_relative_end(&mut context, Some(&Value::from(-11)), 10),
+        Array::get_relative_end(&mut context, Some(&JsValue::new(-11)), 10),
         Ok(0)
     );
     assert_eq!(
-        Array::get_relative_end(&mut context, Some(&Value::from(11)), 10),
+        Array::get_relative_end(&mut context, Some(&JsValue::new(11)), 10),
         Ok(10)
     );
     assert_eq!(
-        Array::get_relative_end(&mut context, Some(&Value::from(f64::MIN)), 10),
+        Array::get_relative_end(&mut context, Some(&JsValue::new(f64::MIN)), 10),
         Ok(0)
     );
     assert_eq!(
         Array::get_relative_end(
             &mut context,
-            Some(&Value::from(Number::MIN_SAFE_INTEGER)),
+            Some(&JsValue::new(Number::MIN_SAFE_INTEGER)),
             10
         ),
         Ok(0)
     );
     assert_eq!(
-        Array::get_relative_end(&mut context, Some(&Value::from(f64::MAX)), 10),
+        Array::get_relative_end(&mut context, Some(&JsValue::new(f64::MAX)), 10),
         Ok(10)
     );
 
@@ -1533,7 +1533,7 @@ fn get_relative_end() {
     assert_eq!(
         Array::get_relative_end(
             &mut context,
-            Some(&Value::from(Number::MAX_SAFE_INTEGER)),
+            Some(&JsValue::new(Number::MAX_SAFE_INTEGER)),
             10
         ),
         Ok(10)

boa/src/builtins/bigint/mod.rs

@@ -17,7 +17,7 @@ use crate::{
     object::{ConstructorBuilder, ObjectData},
     property::Attribute,
     symbol::WellKnownSymbols,
-    BoaProfiler, Context, JsBigInt, Result, Value,
+    BoaProfiler, Context, JsBigInt, JsValue, Result,
 };
 #[cfg(test)]
 mod tests;
@@ -33,7 +33,7 @@ impl BuiltIn for BigInt {
         Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE
     }
 
-    fn init(context: &mut Context) -> (&'static str, Value, Attribute) {
+    fn init(context: &mut Context) -> (&'static str, JsValue, Attribute) {
         let _timer = BoaProfiler::global().start_event(Self::NAME, "init");
 
         let to_string_tag = WellKnownSymbols::to_string_tag();
@@ -76,12 +76,12 @@ impl BigInt {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-bigint-objects
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt/BigInt
-    fn constructor(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    fn constructor(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         let data = match args.get(0) {
             Some(value) => value.to_bigint(context)?,
             None => JsBigInt::zero(),
         };
-        Ok(Value::from(data))
+        Ok(JsValue::new(data))
     }
 
     /// The abstract operation thisBigIntValue takes argument value.
@@ -95,15 +95,15 @@ impl BigInt {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-thisbigintvalue
     #[inline]
-    fn this_bigint_value(value: &Value, context: &mut Context) -> Result<JsBigInt> {
+    fn this_bigint_value(value: &JsValue, context: &mut Context) -> Result<JsBigInt> {
         match value {
             // 1. If Type(value) is BigInt, return value.
-            Value::BigInt(ref bigint) => return Ok(bigint.clone()),
+            JsValue::BigInt(ref bigint) => return Ok(bigint.clone()),
 
             // 2. If Type(value) is Object and value has a [[BigIntData]] internal slot, then
             //    a. Assert: Type(value.[[BigIntData]]) is BigInt.
             //    b. Return value.[[BigIntData]].
-            Value::Object(ref object) => {
+            JsValue::Object(ref object) => {
                 if let ObjectData::BigInt(ref bigint) = object.borrow().data {
                     return Ok(bigint.clone());
                 }
@@ -126,7 +126,11 @@ impl BigInt {
     /// [spec]: https://tc39.es/ecma262/#sec-bigint.prototype.tostring
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt/toString
     #[allow(clippy::wrong_self_convention)]
-    pub(crate) fn to_string(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn to_string(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         let radix = if !args.is_empty() {
             args[0].to_integer(context)? as i32
         } else {
@@ -136,7 +140,7 @@ impl BigInt {
             return context
                 .throw_range_error("radix must be an integer at least 2 and no greater than 36");
         }
-        Ok(Value::from(
+        Ok(JsValue::new(
             Self::this_bigint_value(this, context)?.to_string_radix(radix as u32),
         ))
     }
@@ -151,8 +155,12 @@ impl BigInt {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-bigint.prototype.valueof
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt/valueOf
-    pub(crate) fn value_of(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
-        Ok(Value::from(Self::this_bigint_value(this, context)?))
+    pub(crate) fn value_of(
+        this: &JsValue,
+        _: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
+        Ok(JsValue::new(Self::this_bigint_value(this, context)?))
     }
 
     /// `BigInt.asIntN()`
@@ -162,18 +170,22 @@ impl BigInt {
     /// [spec]: https://tc39.es/ecma262/#sec-bigint.asintn
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt/asIntN
     #[allow(clippy::wrong_self_convention)]
-    pub(crate) fn as_int_n(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn as_int_n(
+        _: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         let (modulo, bits) = Self::calculate_as_uint_n(args, context)?;
 
         if bits > 0
             && modulo >= JsBigInt::pow(&JsBigInt::new(2), &JsBigInt::new(bits as i64 - 1), context)?
         {
-            Ok(Value::from(JsBigInt::sub(
+            Ok(JsValue::new(JsBigInt::sub(
                 &modulo,
                 &JsBigInt::pow(&JsBigInt::new(2), &JsBigInt::new(bits as i64), context)?,
             )))
         } else {
-            Ok(Value::from(modulo))
+            Ok(JsValue::new(modulo))
         }
     }
 
@@ -184,10 +196,14 @@ impl BigInt {
     /// [spec]: https://tc39.es/ecma262/#sec-bigint.asuintn
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt/asUintN
     #[allow(clippy::wrong_self_convention)]
-    pub(crate) fn as_uint_n(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn as_uint_n(
+        _: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         let (modulo, _) = Self::calculate_as_uint_n(args, context)?;
 
-        Ok(Value::from(modulo))
+        Ok(JsValue::new(modulo))
     }
 
     /// Helper function to wrap the value of a `BigInt` to an unsigned integer.
@@ -195,10 +211,10 @@ impl BigInt {
     /// This function expects the same arguments as `as_uint_n` and wraps the value of a `BigInt`.
     /// Additionally to the wrapped unsigned value it returns the converted `bits` argument, so it
     /// can be reused from the `as_int_n` method.
-    fn calculate_as_uint_n(args: &[Value], context: &mut Context) -> Result<(JsBigInt, u32)> {
+    fn calculate_as_uint_n(args: &[JsValue], context: &mut Context) -> Result<(JsBigInt, u32)> {
         use std::convert::TryFrom;
 
-        let undefined_value = Value::undefined();
+        let undefined_value = JsValue::undefined();
 
         let bits_arg = args.get(0).unwrap_or(&undefined_value);
         let bigint_arg = args.get(1).unwrap_or(&undefined_value);

boa/src/builtins/boolean/mod.rs

@@ -16,7 +16,7 @@ use crate::{
     builtins::BuiltIn,
     object::{ConstructorBuilder, ObjectData, PROTOTYPE},
     property::Attribute,
-    BoaProfiler, Context, Result, Value,
+    BoaProfiler, Context, JsValue, Result,
 };
 
 /// Boolean implementation.
@@ -31,7 +31,7 @@ impl BuiltIn for Boolean {
         Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE
     }
 
-    fn init(context: &mut Context) -> (&'static str, Value, Attribute) {
+    fn init(context: &mut Context) -> (&'static str, JsValue, Attribute) {
         let _timer = BoaProfiler::global().start_event(Self::NAME, "init");
 
         let boolean_object = ConstructorBuilder::with_standard_object(
@@ -57,14 +57,14 @@ impl Boolean {
     ///
     /// `[[Call]]` Creates a new boolean primitive
     pub(crate) fn constructor(
-        new_target: &Value,
-        args: &[Value],
+        new_target: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         // Get the argument, if any
         let data = args.get(0).map(|x| x.to_boolean()).unwrap_or(false);
         if new_target.is_undefined() {
-            return Ok(Value::from(data));
+            return Ok(JsValue::new(data));
         }
         let prototype = new_target
             .as_object()
@@ -75,7 +75,7 @@ impl Boolean {
             })
             .transpose()?
             .unwrap_or_else(|| context.standard_objects().object_object().prototype());
-        let boolean = Value::new_object(context);
+        let boolean = JsValue::new_object(context);
 
         boolean
             .as_object()
@@ -92,10 +92,10 @@ impl Boolean {
     ///  - [ECMAScript reference][spec]
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-thisbooleanvalue
-    fn this_boolean_value(value: &Value, context: &mut Context) -> Result<bool> {
+    fn this_boolean_value(value: &JsValue, context: &mut Context) -> Result<bool> {
         match value {
-            Value::Boolean(boolean) => return Ok(*boolean),
-            Value::Object(ref object) => {
+            JsValue::Boolean(boolean) => return Ok(*boolean),
+            JsValue::Object(ref object) => {
                 let object = object.borrow();
                 if let Some(boolean) = object.as_boolean() {
                     return Ok(boolean);
@@ -116,9 +116,13 @@ impl Boolean {
     /// [spec]: https://tc39.es/ecma262/#sec-boolean-object
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Boolean/toString
     #[allow(clippy::wrong_self_convention)]
-    pub(crate) fn to_string(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn to_string(
+        this: &JsValue,
+        _: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         let boolean = Self::this_boolean_value(this, context)?;
-        Ok(Value::from(boolean.to_string()))
+        Ok(JsValue::new(boolean.to_string()))
     }
 
     /// The valueOf() method returns the primitive value of a `Boolean` object.
@@ -130,7 +134,11 @@ impl Boolean {
     /// [spec]: https://tc39.es/ecma262/#sec-boolean.prototype.valueof
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Boolean/valueOf
     #[inline]
-    pub(crate) fn value_of(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
-        Ok(Value::from(Self::this_boolean_value(this, context)?))
+    pub(crate) fn value_of(
+        this: &JsValue,
+        _: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
+        Ok(JsValue::new(Self::this_boolean_value(this, context)?))
     }
 }

boa/src/builtins/boolean/tests.rs

@@ -1,4 +1,4 @@
-use crate::{forward, forward_val, Context, Value};
+use crate::{forward, forward_val, Context, JsValue};
 
 /// Test the correct type is returned from call and construct
 #[allow(clippy::unwrap_used)]
@@ -58,7 +58,7 @@ fn instances_have_correct_proto_set() {
     let bool_instance = forward_val(&mut context, "boolInstance").expect("value expected");
     let bool_prototype = forward_val(&mut context, "boolProto").expect("value expected");
 
-    assert!(Value::same_value(
+    assert!(JsValue::same_value(
         &bool_instance.as_object().unwrap().prototype_instance(),
         &bool_prototype
     ));

boa/src/builtins/console/mod.rs

@@ -20,7 +20,7 @@ use crate::{
     builtins::BuiltIn,
     object::ObjectInitializer,
     property::Attribute,
-    value::{display::display_obj, Value},
+    value::{display::display_obj, JsValue},
     BoaProfiler, Context, JsString, Result,
 };
 use rustc_hash::FxHashMap;
@@ -50,7 +50,7 @@ pub(crate) fn logger(msg: LogMessage, console_state: &Console) {
 }
 
 /// This represents the `console` formatter.
-pub fn formatter(data: &[Value], context: &mut Context) -> Result<String> {
+pub fn formatter(data: &[JsValue], context: &mut Context) -> Result<String> {
     let target = data
         .get(0)
         .cloned()
@@ -141,7 +141,7 @@ impl BuiltIn for Console {
         Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE
     }
 
-    fn init(context: &mut Context) -> (&'static str, Value, Attribute) {
+    fn init(context: &mut Context) -> (&'static str, JsValue, Attribute) {
         let _timer = BoaProfiler::global().start_event(Self::NAME, "init");
         let console = ObjectInitializer::new(context)
             .function(Self::assert, "assert", 0)
@@ -184,19 +184,19 @@ impl Console {
     ///
     /// [spec]: https://console.spec.whatwg.org/#assert
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/API/console/assert
-    pub(crate) fn assert(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
-        let assertion = args.get(0).map(Value::to_boolean).unwrap_or(false);
+    pub(crate) fn assert(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
+        let assertion = args.get(0).map(JsValue::to_boolean).unwrap_or(false);
 
         if !assertion {
-            let mut args: Vec<Value> = args.iter().skip(1).cloned().collect();
+            let mut args: Vec<JsValue> = args.iter().skip(1).cloned().collect();
             let message = "Assertion failed".to_string();
             if args.is_empty() {
-                args.push(Value::from(message));
+                args.push(JsValue::new(message));
             } else if !args[0].is_string() {
-                args.insert(0, Value::from(message));
+                args.insert(0, JsValue::new(message));
             } else {
                 let concat = format!("{}: {}", message, args[0].display());
-                args[0] = Value::from(concat);
+                args[0] = JsValue::new(concat);
             }
 
             logger(
@@ -205,7 +205,7 @@ impl Console {
             );
         }
 
-        Ok(Value::undefined())
+        Ok(JsValue::undefined())
     }
 
     /// `console.clear()`
@@ -218,9 +218,9 @@ impl Console {
     ///
     /// [spec]: https://console.spec.whatwg.org/#clear
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/API/console/clear
-    pub(crate) fn clear(_: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn clear(_: &JsValue, _: &[JsValue], context: &mut Context) -> Result<JsValue> {
         context.console_mut().groups.clear();
-        Ok(Value::undefined())
+        Ok(JsValue::undefined())
     }
 
     /// `console.debug(...data)`
@@ -233,12 +233,12 @@ impl Console {
     ///
     /// [spec]: https://console.spec.whatwg.org/#debug
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/API/console/debug
-    pub(crate) fn debug(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn debug(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         logger(
             LogMessage::Log(formatter(args, context)?),
             context.console(),
         );
-        Ok(Value::undefined())
+        Ok(JsValue::undefined())
     }
 
     /// `console.error(...data)`
@@ -251,12 +251,12 @@ impl Console {
     ///
     /// [spec]: https://console.spec.whatwg.org/#error
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/API/console/error
-    pub(crate) fn error(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn error(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         logger(
             LogMessage::Error(formatter(args, context)?),
             context.console(),
         );
-        Ok(Value::undefined())
+        Ok(JsValue::undefined())
     }
 
     /// `console.info(...data)`
@@ -269,12 +269,12 @@ impl Console {
     ///
     /// [spec]: https://console.spec.whatwg.org/#info
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/API/console/info
-    pub(crate) fn info(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn info(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         logger(
             LogMessage::Info(formatter(args, context)?),
             context.console(),
         );
-        Ok(Value::undefined())
+        Ok(JsValue::undefined())
     }
 
     /// `console.log(...data)`
@@ -287,12 +287,12 @@ impl Console {
     ///
     /// [spec]: https://console.spec.whatwg.org/#log
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/API/console/log
-    pub(crate) fn log(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn log(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         logger(
             LogMessage::Log(formatter(args, context)?),
             context.console(),
         );
-        Ok(Value::undefined())
+        Ok(JsValue::undefined())
     }
 
     /// `console.trace(...data)`
@@ -305,7 +305,7 @@ impl Console {
     ///
     /// [spec]: https://console.spec.whatwg.org/#trace
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/API/console/trace
-    pub(crate) fn trace(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn trace(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         if !args.is_empty() {
             logger(
                 LogMessage::Log(formatter(args, context)?),
@@ -319,7 +319,7 @@ impl Console {
             )
         }
 
-        Ok(Value::undefined())
+        Ok(JsValue::undefined())
     }
 
     /// `console.warn(...data)`
@@ -332,12 +332,12 @@ impl Console {
     ///
     /// [spec]: https://console.spec.whatwg.org/#warn
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/API/console/warn
-    pub(crate) fn warn(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn warn(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         logger(
             LogMessage::Warn(formatter(args, context)?),
             context.console(),
         );
-        Ok(Value::undefined())
+        Ok(JsValue::undefined())
     }
 
     /// `console.count(label)`
@@ -350,7 +350,7 @@ impl Console {
     ///
     /// [spec]: https://console.spec.whatwg.org/#count
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/API/console/count
-    pub(crate) fn count(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn count(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         let label = match args.get(0) {
             Some(value) => value.to_string(context)?,
             None => "default".into(),
@@ -364,7 +364,7 @@ impl Console {
             LogMessage::Info(format!("{} {}", msg, c)),
             context.console(),
         );
-        Ok(Value::undefined())
+        Ok(JsValue::undefined())
     }
 
     /// `console.countReset(label)`
@@ -377,7 +377,11 @@ impl Console {
     ///
     /// [spec]: https://console.spec.whatwg.org/#countreset
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/API/countReset
-    pub(crate) fn count_reset(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn count_reset(
+        _: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         let label = match args.get(0) {
             Some(value) => value.to_string(context)?,
             None => "default".into(),
@@ -390,7 +394,7 @@ impl Console {
             context.console(),
         );
 
-        Ok(Value::undefined())
+        Ok(JsValue::undefined())
     }
 
     /// Returns current system time in ms.
@@ -411,7 +415,7 @@ impl Console {
     ///
     /// [spec]: https://console.spec.whatwg.org/#time
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/API/console/time
-    pub(crate) fn time(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn time(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         let label = match args.get(0) {
             Some(value) => value.to_string(context)?,
             None => "default".into(),
@@ -427,7 +431,7 @@ impl Console {
             context.console_mut().timer_map.insert(label, time);
         }
 
-        Ok(Value::undefined())
+        Ok(JsValue::undefined())
     }
 
     /// `console.timeLog(label, ...data)`
@@ -440,7 +444,11 @@ impl Console {
     ///
     /// [spec]: https://console.spec.whatwg.org/#timelog
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/API/console/timeLog
-    pub(crate) fn time_log(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn time_log(
+        _: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         let label = match args.get(0) {
             Some(value) => value.to_string(context)?,
             None => "default".into(),
@@ -460,7 +468,7 @@ impl Console {
             );
         }
 
-        Ok(Value::undefined())
+        Ok(JsValue::undefined())
     }
 
     /// `console.timeEnd(label)`
@@ -473,7 +481,11 @@ impl Console {
     ///
     /// [spec]: https://console.spec.whatwg.org/#timeend
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/API/console/timeEnd
-    pub(crate) fn time_end(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn time_end(
+        _: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         let label = match args.get(0) {
             Some(value) => value.to_string(context)?,
             None => "default".into(),
@@ -492,7 +504,7 @@ impl Console {
             );
         }
 
-        Ok(Value::undefined())
+        Ok(JsValue::undefined())
     }
 
     /// `console.group(...data)`
@@ -505,7 +517,7 @@ impl Console {
     ///
     /// [spec]: https://console.spec.whatwg.org/#group
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/API/console/group
-    pub(crate) fn group(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn group(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         let group_label = formatter(args, context)?;
 
         logger(
@@ -514,7 +526,7 @@ impl Console {
         );
         context.console_mut().groups.push(group_label);
 
-        Ok(Value::undefined())
+        Ok(JsValue::undefined())
     }
 
     /// `console.groupEnd(label)`
@@ -527,10 +539,10 @@ impl Console {
     ///
     /// [spec]: https://console.spec.whatwg.org/#groupend
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/API/console/groupEnd
-    pub(crate) fn group_end(_: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn group_end(_: &JsValue, _: &[JsValue], context: &mut Context) -> Result<JsValue> {
         context.console_mut().groups.pop();
 
-        Ok(Value::undefined())
+        Ok(JsValue::undefined())
     }
 
     /// `console.dir(item, options)`
@@ -543,13 +555,13 @@ impl Console {
     ///
     /// [spec]: https://console.spec.whatwg.org/#dir
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/API/console/dir
-    pub(crate) fn dir(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
-        let undefined = Value::undefined();
+    pub(crate) fn dir(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
+        let undefined = JsValue::undefined();
         logger(
             LogMessage::Info(display_obj(args.get(0).unwrap_or(&undefined), true)),
             context.console(),
         );
 
-        Ok(Value::undefined())
+        Ok(JsValue::undefined())
     }
 }

boa/src/builtins/console/tests.rs

@@ -1,4 +1,4 @@
-use crate::{builtins::console::formatter, Context, Value};
+use crate::{builtins::console::formatter, Context, JsValue};
 
 #[test]
 fn formatter_no_args_is_empty_string() {
@@ -9,14 +9,14 @@ fn formatter_no_args_is_empty_string() {
 #[test]
 fn formatter_empty_format_string_is_empty_string() {
     let mut context = Context::new();
-    let val = Value::string("".to_string());
+    let val = JsValue::new("");
     assert_eq!(formatter(&[val], &mut context).unwrap(), "");
 }
 
 #[test]
 fn formatter_format_without_args_renders_verbatim() {
     let mut context = Context::new();
-    let val = [Value::string("%d %s %% %f")];
+    let val = [JsValue::new("%d %s %% %f")];
     let res = formatter(&val, &mut context).unwrap();
     assert_eq!(res, "%d %s %% %f");
 }
@@ -26,9 +26,9 @@ fn formatter_empty_format_string_concatenates_rest_of_args() {
     let mut context = Context::new();
 
     let val = [
-        Value::string(""),
-        Value::string("to powinno zostać"),
-        Value::string("połączone"),
+        JsValue::new(""),
+        JsValue::new("to powinno zostać"),
+        JsValue::new("połączone"),
     ];
     let res = formatter(&val, &mut context).unwrap();
     assert_eq!(res, " to powinno zostać połączone");
@@ -39,10 +39,10 @@ fn formatter_utf_8_checks() {
     let mut context = Context::new();
 
     let val = [
-        Value::string("Są takie chwile %dą %są tu%sów %привет%ź".to_string()),
-        Value::integer(123),
-        Value::rational(1.23),
-        Value::string("ł".to_string()),
+        JsValue::new("Są takie chwile %dą %są tu%sów %привет%ź".to_string()),
+        JsValue::new(123),
+        JsValue::new(1.23),
+        JsValue::new("ł"),
     ];
     let res = formatter(&val, &mut context).unwrap();
     assert_eq!(res, "Są takie chwile 123ą 1.23ą tułów %привет%ź");
@@ -52,10 +52,7 @@ fn formatter_utf_8_checks() {
 fn formatter_trailing_format_leader_renders() {
     let mut context = Context::new();
 
-    let val = [
-        Value::string("%%%%%".to_string()),
-        Value::string("|".to_string()),
-    ];
+    let val = [JsValue::new("%%%%%"), JsValue::new("|")];
     let res = formatter(&val, &mut context).unwrap();
     assert_eq!(res, "%%% |");
 }
@@ -65,7 +62,7 @@ fn formatter_trailing_format_leader_renders() {
 fn formatter_float_format_works() {
     let mut context = Context::new();
 
-    let val = [Value::string("%f".to_string()), Value::rational(3.1415)];
+    let val = [JsValue::new("%f"), JsValue::new(3.1415)];
     let res = formatter(&val, &mut context).unwrap();
     assert_eq!(res, "3.141500");
 }

boa/src/builtins/date/mod.rs

@@ -6,7 +6,7 @@ use crate::{
     gc::{empty_trace, Finalize, Trace},
     object::{ConstructorBuilder, ObjectData, PROTOTYPE},
     property::Attribute,
-    value::{PreferredType, Value},
+    value::{JsValue, PreferredType},
     BoaProfiler, Context, Result,
 };
 use chrono::{prelude::*, Duration, LocalResult};
@@ -45,14 +45,14 @@ fn ignore_ambiguity<T>(result: LocalResult<T>) -> Option<T> {
 
 macro_rules! getter_method {
     ($name:ident) => {{
-        fn get_value(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
-            Ok(Value::from(this_time_value(this, context)?.$name()))
+        fn get_value(this: &JsValue, _: &[JsValue], context: &mut Context) -> Result<JsValue> {
+            Ok(JsValue::new(this_time_value(this, context)?.$name()))
         }
         get_value
     }};
     (Self::$name:ident) => {{
-        fn get_value(_: &Value, _: &[Value], _: &mut Context) -> Result<Value> {
-            Ok(Value::from(Date::$name()))
+        fn get_value(_: &JsValue, _: &[JsValue], _: &mut Context) -> Result<JsValue> {
+            Ok(JsValue::new(Date::$name()))
         }
         get_value
     }};
@@ -60,7 +60,7 @@ macro_rules! getter_method {
 
 macro_rules! setter_method {
     ($name:ident($($e:expr),* $(,)?)) => {{
-        fn set_value(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+        fn set_value(this: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
             let mut result = this_time_value(this, context)?;
             result.$name(
                 $(
@@ -82,7 +82,7 @@ macro_rules! setter_method {
             );
 
             this.set_data(ObjectData::Date(result));
-            Ok(Value::from(result.get_time()))
+            Ok(JsValue::new(result.get_time()))
         }
         set_value
     }};
@@ -119,7 +119,7 @@ impl BuiltIn for Date {
         Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE
     }
 
-    fn init(context: &mut Context) -> (&'static str, Value, Attribute) {
+    fn init(context: &mut Context) -> (&'static str, JsValue, Attribute) {
         let _timer = BoaProfiler::global().start_event(Self::NAME, "init");
 
         let date_object = ConstructorBuilder::new(context, Self::constructor)
@@ -366,10 +366,10 @@ impl Date {
     /// [spec]: https://tc39.es/ecma262/#sec-date-constructor
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/Date
     pub(crate) fn constructor(
-        new_target: &Value,
-        args: &[Value],
+        new_target: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         if new_target.is_undefined() {
             Ok(Self::make_date_string())
         } else {
@@ -405,8 +405,8 @@ impl Date {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-date-constructor
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/Date
-    pub(crate) fn make_date_string() -> Value {
-        Value::from(Local::now().to_rfc3339())
+    pub(crate) fn make_date_string() -> JsValue {
+        JsValue::new(Local::now().to_rfc3339())
     }
 
     /// `Date()`
@@ -419,7 +419,7 @@ impl Date {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-date-constructor
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/Date
-    pub(crate) fn make_date_now(this: &Value) -> Value {
+    pub(crate) fn make_date_now(this: &JsValue) -> JsValue {
         let date = Date::default();
         this.set_data(ObjectData::Date(date));
         this.clone()
@@ -436,15 +436,15 @@ impl Date {
     /// [spec]: https://tc39.es/ecma262/#sec-date-constructor
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/Date
     pub(crate) fn make_date_single(
-        this: &Value,
-        args: &[Value],
+        this: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         let value = &args[0];
         let tv = match this_time_value(value, context) {
             Ok(dt) => dt.0,
             _ => match value.to_primitive(context, PreferredType::Default)? {
-                Value::String(ref str) => match chrono::DateTime::parse_from_rfc3339(str) {
+                JsValue::String(ref str) => match chrono::DateTime::parse_from_rfc3339(str) {
                     Ok(dt) => Some(dt.naive_utc()),
                     _ => None,
                 },
@@ -474,10 +474,10 @@ impl Date {
     /// [spec]: https://tc39.es/ecma262/#sec-date-constructor
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/Date
     pub(crate) fn make_date_multiple(
-        this: &Value,
-        args: &[Value],
+        this: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         let year = args[0].to_number(context)?;
         let month = args[1].to_number(context)?;
         let day = args
@@ -1313,8 +1313,8 @@ impl Date {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-date.now
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/now
-    pub(crate) fn now(_: &Value, _: &[Value], _: &mut Context) -> Result<Value> {
-        Ok(Value::from(Utc::now().timestamp_millis() as f64))
+    pub(crate) fn now(_: &JsValue, _: &[JsValue], _: &mut Context) -> Result<JsValue> {
+        Ok(JsValue::new(Utc::now().timestamp_millis() as f64))
     }
 
     /// `Date.parse()`
@@ -1329,17 +1329,17 @@ impl Date {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-date.parse
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/parse
-    pub(crate) fn parse(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn parse(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         // This method is implementation-defined and discouraged, so we just require the same format as the string
         // constructor.
 
         if args.is_empty() {
-            return Ok(Value::number(f64::NAN));
+            return Ok(JsValue::nan());
         }
 
         match DateTime::parse_from_rfc3339(&args[0].to_string(context)?) {
-            Ok(v) => Ok(Value::number(v.naive_utc().timestamp_millis() as f64)),
-            _ => Ok(Value::number(f64::NAN)),
+            Ok(v) => Ok(JsValue::new(v.naive_utc().timestamp_millis() as f64)),
+            _ => Ok(JsValue::new(f64::NAN)),
         }
     }
 
@@ -1353,7 +1353,7 @@ impl Date {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-date.utc
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/UTC
-    pub(crate) fn utc(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn utc(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         let year = args
             .get(0)
             .map_or(Ok(f64::NAN), |value| value.to_number(context))?;
@@ -1377,7 +1377,7 @@ impl Date {
             .map_or(Ok(0f64), |value| value.to_number(context))?;
 
         if !check_normal_opt!(year, month, day, hour, min, sec, milli) {
-            return Ok(Value::number(f64::NAN));
+            return Ok(JsValue::nan());
         }
 
         let year = year as i32;
@@ -1397,7 +1397,7 @@ impl Date {
         NaiveDate::from_ymd_opt(year, month + 1, day)
             .and_then(|f| f.and_hms_milli_opt(hour, min, sec, milli))
             .and_then(|f| Self::time_clip(f.timestamp_millis() as f64))
-            .map_or(Ok(Value::number(f64::NAN)), |time| Ok(Value::number(time)))
+            .map_or(Ok(JsValue::nan()), |time| Ok(JsValue::new(time)))
     }
 }
 
@@ -1414,8 +1414,8 @@ impl Date {
 ///
 /// [spec]: https://tc39.es/ecma262/#sec-thistimevalue
 #[inline]
-pub fn this_time_value(value: &Value, context: &mut Context) -> Result<Date> {
-    if let Value::Object(ref object) = value {
+pub fn this_time_value(value: &JsValue, context: &mut Context) -> Result<Date> {
+    if let JsValue::Object(ref object) = value {
         if let ObjectData::Date(ref date) = object.borrow().data {
             return Ok(*date);
         }

boa/src/builtins/date/tests.rs

@@ -1,6 +1,6 @@
 #![allow(clippy::zero_prefixed_literal)]
 
-use crate::{forward, forward_val, object::ObjectData, Context, Value};
+use crate::{forward, forward_val, object::ObjectData, Context, JsValue};
 use chrono::prelude::*;
 
 // NOTE: Javascript Uses 0-based months, where chrono uses 1-based months. Many of the assertions look wrong because of
@@ -13,7 +13,7 @@ fn forward_dt_utc(context: &mut Context, src: &str) -> Option<NaiveDateTime> {
         panic!("expected success")
     };
 
-    if let Value::Object(ref date_time) = date_time {
+    if let JsValue::Object(ref date_time) = date_time {
         if let ObjectData::Date(ref date_time) = date_time.borrow().data {
             date_time.0
         } else {
@@ -66,7 +66,7 @@ fn date_this_time_value() {
         .expect_value()
         .clone();
 
-    assert_eq!(Value::string("\'this\' is not a Date"), *message_property);
+    assert_eq!(JsValue::new("\'this\' is not a Date"), *message_property);
 }
 
 #[test]
@@ -212,7 +212,7 @@ fn date_ctor_parse_call() -> Result<(), Box<dyn std::error::Error>> {
 
     let date_time = forward_val(&mut context, "Date.parse('2020-06-08T09:16:15.779-07:30')");
 
-    assert_eq!(Ok(Value::Rational(1591634775779f64)), date_time);
+    assert_eq!(Ok(JsValue::new(1591634775779f64)), date_time);
     Ok(())
 }
 
@@ -222,7 +222,7 @@ fn date_ctor_utc_call() -> Result<(), Box<dyn std::error::Error>> {
 
     let date_time = forward_val(&mut context, "Date.UTC(2020, 06, 08, 09, 16, 15, 779)");
 
-    assert_eq!(Ok(Value::Rational(1594199775779f64)), date_time);
+    assert_eq!(Ok(JsValue::new(1594199775779f64)), date_time);
     Ok(())
 }
 
@@ -231,7 +231,7 @@ fn date_ctor_utc_call_nan() -> Result<(), Box<dyn std::error::Error>> {
     fn check(src: &str) {
         let mut context = Context::new();
         let date_time = forward_val(&mut context, src).expect("Expected Success");
-        assert_eq!(Value::Rational(f64::NAN), date_time);
+        assert_eq!(JsValue::nan(), date_time);
     }
 
     check("Date.UTC(1/0, 06, 08, 09, 16, 15, 779)");
@@ -253,10 +253,10 @@ fn date_proto_get_date_call() -> Result<(), Box<dyn std::error::Error>> {
         &mut context,
         "new Date(2020, 06, 08, 09, 16, 15, 779).getDate()",
     );
-    assert_eq!(Ok(Value::Rational(08f64)), actual);
+    assert_eq!(Ok(JsValue::new(08f64)), actual);
 
     let actual = forward_val(&mut context, "new Date(1/0).getDate()");
-    assert_eq!(Ok(Value::Rational(f64::NAN)), actual);
+    assert_eq!(Ok(JsValue::nan()), actual);
 
     Ok(())
 }
@@ -269,10 +269,10 @@ fn date_proto_get_day_call() -> Result<(), Box<dyn std::error::Error>> {
         &mut context,
         "new Date(2020, 06, 08, 09, 16, 15, 779).getDay()",
     );
-    assert_eq!(Ok(Value::Rational(3f64)), actual);
+    assert_eq!(Ok(JsValue::new(3f64)), actual);
 
     let actual = forward_val(&mut context, "new Date(1/0).getDay()");
-    assert_eq!(Ok(Value::Rational(f64::NAN)), actual);
+    assert_eq!(Ok(JsValue::nan()), actual);
     Ok(())
 }
 
@@ -284,10 +284,10 @@ fn date_proto_get_full_year_call() -> Result<(), Box<dyn std::error::Error>> {
         &mut context,
         "new Date(2020, 06, 08, 09, 16, 15, 779).getFullYear()",
     );
-    assert_eq!(Ok(Value::Rational(2020f64)), actual);
+    assert_eq!(Ok(JsValue::new(2020f64)), actual);
 
     let actual = forward_val(&mut context, "new Date(1/0).getFullYear()");
-    assert_eq!(Ok(Value::Rational(f64::NAN)), actual);
+    assert_eq!(Ok(JsValue::nan()), actual);
     Ok(())
 }
 
@@ -299,10 +299,10 @@ fn date_proto_get_hours_call() -> Result<(), Box<dyn std::error::Error>> {
         &mut context,
         "new Date(2020, 06, 08, 09, 16, 15, 779).getHours()",
     );
-    assert_eq!(Ok(Value::Rational(09f64)), actual);
+    assert_eq!(Ok(JsValue::new(09f64)), actual);
 
     let actual = forward_val(&mut context, "new Date(1/0).getHours()");
-    assert_eq!(Ok(Value::Rational(f64::NAN)), actual);
+    assert_eq!(Ok(JsValue::nan()), actual);
     Ok(())
 }
 
@@ -314,10 +314,10 @@ fn date_proto_get_milliseconds_call() -> Result<(), Box<dyn std::error::Error>>
         &mut context,
         "new Date(2020, 06, 08, 09, 16, 15, 779).getMilliseconds()",
     );
-    assert_eq!(Ok(Value::Rational(779f64)), actual);
+    assert_eq!(Ok(JsValue::new(779f64)), actual);
 
     let actual = forward_val(&mut context, "new Date(1/0).getMilliseconds()");
-    assert_eq!(Ok(Value::Rational(f64::NAN)), actual);
+    assert_eq!(Ok(JsValue::nan()), actual);
     Ok(())
 }
 
@@ -329,10 +329,10 @@ fn date_proto_get_minutes_call() -> Result<(), Box<dyn std::error::Error>> {
         &mut context,
         "new Date(2020, 06, 08, 09, 16, 15, 779).getMinutes()",
     );
-    assert_eq!(Ok(Value::Rational(16f64)), actual);
+    assert_eq!(Ok(JsValue::new(16f64)), actual);
 
     let actual = forward_val(&mut context, "new Date(1/0).getMinutes()");
-    assert_eq!(Ok(Value::Rational(f64::NAN)), actual);
+    assert_eq!(Ok(JsValue::nan()), actual);
     Ok(())
 }
 
@@ -344,10 +344,10 @@ fn date_proto_get_month() -> Result<(), Box<dyn std::error::Error>> {
         &mut context,
         "new Date(2020, 06, 08, 09, 16, 15, 779).getMonth()",
     );
-    assert_eq!(Ok(Value::Rational(06f64)), actual);
+    assert_eq!(Ok(JsValue::new(06f64)), actual);
 
     let actual = forward_val(&mut context, "new Date(1/0).getMonth()");
-    assert_eq!(Ok(Value::Rational(f64::NAN)), actual);
+    assert_eq!(Ok(JsValue::nan()), actual);
 
     Ok(())
 }
@@ -360,10 +360,10 @@ fn date_proto_get_seconds() -> Result<(), Box<dyn std::error::Error>> {
         &mut context,
         "new Date(2020, 06, 08, 09, 16, 15, 779).getSeconds()",
     );
-    assert_eq!(Ok(Value::Rational(15f64)), actual);
+    assert_eq!(Ok(JsValue::new(15f64)), actual);
 
     let actual = forward_val(&mut context, "new Date(1/0).getSeconds()");
-    assert_eq!(Ok(Value::Rational(f64::NAN)), actual);
+    assert_eq!(Ok(JsValue::nan()), actual);
     Ok(())
 }
 
@@ -380,10 +380,10 @@ fn date_proto_get_time() -> Result<(), Box<dyn std::error::Error>> {
         .ymd(2020, 07, 08)
         .and_hms_milli(09, 16, 15, 779)
         .timestamp_millis() as f64;
-    assert_eq!(Ok(Value::Rational(ts)), actual);
+    assert_eq!(Ok(JsValue::new(ts)), actual);
 
     let actual = forward_val(&mut context, "new Date(1/0).getTime()");
-    assert_eq!(Ok(Value::Rational(f64::NAN)), actual);
+    assert_eq!(Ok(JsValue::nan()), actual);
     Ok(())
 }
 
@@ -395,10 +395,10 @@ fn date_proto_get_year() -> Result<(), Box<dyn std::error::Error>> {
         &mut context,
         "new Date(2020, 06, 08, 09, 16, 15, 779).getYear()",
     );
-    assert_eq!(Ok(Value::Rational(120f64)), actual);
+    assert_eq!(Ok(JsValue::new(120f64)), actual);
 
     let actual = forward_val(&mut context, "new Date(1/0).getYear()");
-    assert_eq!(Ok(Value::Rational(f64::NAN)), actual);
+    assert_eq!(Ok(JsValue::nan()), actual);
     Ok(())
 }
 
@@ -412,7 +412,7 @@ fn date_proto_get_timezone_offset() -> Result<(), Box<dyn std::error::Error>> {
     );
 
     // NB: Host Settings, not TZ specified in the DateTime.
-    assert_eq!(Ok(Value::Boolean(true)), actual);
+    assert_eq!(Ok(JsValue::new(true)), actual);
 
     let actual = forward_val(
         &mut context,
@@ -422,13 +422,13 @@ fn date_proto_get_timezone_offset() -> Result<(), Box<dyn std::error::Error>> {
     // The value of now().offset() depends on the host machine, so we have to replicate the method code here.
     let offset_seconds = chrono::Local::now().offset().local_minus_utc() as f64;
     let offset_minutes = offset_seconds / 60f64;
-    assert_eq!(Ok(Value::Rational(offset_minutes)), actual);
+    assert_eq!(Ok(JsValue::new(offset_minutes)), actual);
 
     let actual = forward_val(
         &mut context,
         "new Date(1/0, 06, 08, 09, 16, 15, 779).getTimezoneOffset()",
     );
-    assert_eq!(Ok(Value::Rational(offset_minutes)), actual);
+    assert_eq!(Ok(JsValue::new(offset_minutes)), actual);
     Ok(())
 }
 
@@ -440,10 +440,10 @@ fn date_proto_get_utc_date_call() -> Result<(), Box<dyn std::error::Error>> {
         &mut context,
         "new Date(Date.UTC(2020, 06, 08, 09, 16, 15, 779)).getUTCDate()",
     );
-    assert_eq!(Ok(Value::Rational(08f64)), actual);
+    assert_eq!(Ok(JsValue::new(08f64)), actual);
 
     let actual = forward_val(&mut context, "new Date(1/0).getUTCDate()");
-    assert_eq!(Ok(Value::Rational(f64::NAN)), actual);
+    assert_eq!(Ok(JsValue::nan()), actual);
 
     Ok(())
 }
@@ -456,10 +456,10 @@ fn date_proto_get_utc_day_call() -> Result<(), Box<dyn std::error::Error>> {
         &mut context,
         "new Date(Date.UTC(2020, 06, 08, 09, 16, 15, 779)).getUTCDay()",
     );
-    assert_eq!(Ok(Value::Rational(3f64)), actual);
+    assert_eq!(Ok(JsValue::new(3f64)), actual);
 
     let actual = forward_val(&mut context, "new Date(1/0).getUTCDay()");
-    assert_eq!(Ok(Value::Rational(f64::NAN)), actual);
+    assert_eq!(Ok(JsValue::nan()), actual);
     Ok(())
 }
 
@@ -471,10 +471,10 @@ fn date_proto_get_utc_full_year_call() -> Result<(), Box<dyn std::error::Error>>
         &mut context,
         "new Date(Date.UTC(2020, 06, 08, 09, 16, 15, 779)).getUTCFullYear()",
     );
-    assert_eq!(Ok(Value::Rational(2020f64)), actual);
+    assert_eq!(Ok(JsValue::new(2020f64)), actual);
 
     let actual = forward_val(&mut context, "new Date(1/0).getUTCFullYear()");
-    assert_eq!(Ok(Value::Rational(f64::NAN)), actual);
+    assert_eq!(Ok(JsValue::nan()), actual);
     Ok(())
 }
 
@@ -486,10 +486,10 @@ fn date_proto_get_utc_hours_call() -> Result<(), Box<dyn std::error::Error>> {
         &mut context,
         "new Date(Date.UTC(2020, 06, 08, 09, 16, 15, 779)).getUTCHours()",
     );
-    assert_eq!(Ok(Value::Rational(09f64)), actual);
+    assert_eq!(Ok(JsValue::new(09f64)), actual);
 
     let actual = forward_val(&mut context, "new Date(1/0).getUTCHours()");
-    assert_eq!(Ok(Value::Rational(f64::NAN)), actual);
+    assert_eq!(Ok(JsValue::nan()), actual);
     Ok(())
 }
 
@@ -501,10 +501,10 @@ fn date_proto_get_utc_milliseconds_call() -> Result<(), Box<dyn std::error::Erro
         &mut context,
         "new Date(Date.UTC(2020, 06, 08, 09, 16, 15, 779)).getUTCMilliseconds()",
     );
-    assert_eq!(Ok(Value::Rational(779f64)), actual);
+    assert_eq!(Ok(JsValue::new(779f64)), actual);
 
     let actual = forward_val(&mut context, "new Date(1/0).getUTCMilliseconds()");
-    assert_eq!(Ok(Value::Rational(f64::NAN)), actual);
+    assert_eq!(Ok(JsValue::nan()), actual);
     Ok(())
 }
 
@@ -516,10 +516,10 @@ fn date_proto_get_utc_minutes_call() -> Result<(), Box<dyn std::error::Error>> {
         &mut context,
         "new Date(Date.UTC(2020, 06, 08, 09, 16, 15, 779)).getUTCMinutes()",
     );
-    assert_eq!(Ok(Value::Rational(16f64)), actual);
+    assert_eq!(Ok(JsValue::new(16f64)), actual);
 
     let actual = forward_val(&mut context, "new Date(1/0).getUTCMinutes()");
-    assert_eq!(Ok(Value::Rational(f64::NAN)), actual);
+    assert_eq!(Ok(JsValue::nan()), actual);
     Ok(())
 }
 
@@ -531,10 +531,10 @@ fn date_proto_get_utc_month() -> Result<(), Box<dyn std::error::Error>> {
         &mut context,
         "new Date(Date.UTC(2020, 06, 08, 09, 16, 15, 779)).getUTCMonth()",
     );
-    assert_eq!(Ok(Value::Rational(06f64)), actual);
+    assert_eq!(Ok(JsValue::new(06f64)), actual);
 
     let actual = forward_val(&mut context, "new Date(1/0).getUTCMonth()");
-    assert_eq!(Ok(Value::Rational(f64::NAN)), actual);
+    assert_eq!(Ok(JsValue::nan()), actual);
 
     Ok(())
 }
@@ -547,10 +547,10 @@ fn date_proto_get_utc_seconds() -> Result<(), Box<dyn std::error::Error>> {
         &mut context,
         "new Date(Date.UTC(2020, 06, 08, 09, 16, 15, 779)).getUTCSeconds()",
     );
-    assert_eq!(Ok(Value::Rational(15f64)), actual);
+    assert_eq!(Ok(JsValue::new(15f64)), actual);
 
     let actual = forward_val(&mut context, "new Date(1/0).getUTCSeconds()");
-    assert_eq!(Ok(Value::Rational(f64::NAN)), actual);
+    assert_eq!(Ok(JsValue::nan()), actual);
     Ok(())
 }
 
@@ -1216,7 +1216,7 @@ fn date_proto_to_date_string() -> Result<(), Box<dyn std::error::Error>> {
         "let dt = new Date(2020, 06, 08, 09, 16, 15, 779); dt.toDateString()",
     )
     .expect("Successful eval");
-    assert_eq!(Value::string("Wed Jul 08 2020"), actual);
+    assert_eq!(JsValue::new("Wed Jul 08 2020"), actual);
 
     Ok(())
 }
@@ -1230,7 +1230,7 @@ fn date_proto_to_gmt_string() -> Result<(), Box<dyn std::error::Error>> {
         "let dt = new Date(Date.UTC(2020, 06, 08, 09, 16, 15, 779)); dt.toGMTString()",
     )
     .expect("Successful eval");
-    assert_eq!(Value::string("Wed, 08 Jul 2020 09:16:15 GMT"), actual);
+    assert_eq!(JsValue::new("Wed, 08 Jul 2020 09:16:15 GMT"), actual);
 
     Ok(())
 }
@@ -1244,7 +1244,7 @@ fn date_proto_to_iso_string() -> Result<(), Box<dyn std::error::Error>> {
         "let dt = new Date(Date.UTC(2020, 06, 08, 09, 16, 15, 779)); dt.toISOString()",
     )
     .expect("Successful eval");
-    assert_eq!(Value::string("2020-07-08T09:16:15.779Z"), actual);
+    assert_eq!(JsValue::new("2020-07-08T09:16:15.779Z"), actual);
 
     Ok(())
 }
@@ -1258,7 +1258,7 @@ fn date_proto_to_json() -> Result<(), Box<dyn std::error::Error>> {
         "let dt = new Date(Date.UTC(2020, 06, 08, 09, 16, 15, 779)); dt.toJSON()",
     )
     .expect("Successful eval");
-    assert_eq!(Value::string("2020-07-08T09:16:15.779Z"), actual);
+    assert_eq!(JsValue::new("2020-07-08T09:16:15.779Z"), actual);
 
     Ok(())
 }
@@ -1274,7 +1274,7 @@ fn date_proto_to_string() -> Result<(), Box<dyn std::error::Error>> {
     .ok();
 
     assert_eq!(
-        Some(Value::string(
+        Some(JsValue::new(
             Local
                 .from_local_datetime(&NaiveDateTime::new(
                     NaiveDate::from_ymd(2020, 6, 8),
@@ -1302,7 +1302,7 @@ fn date_proto_to_time_string() -> Result<(), Box<dyn std::error::Error>> {
     .ok();
 
     assert_eq!(
-        Some(Value::string(
+        Some(JsValue::new(
             Local
                 .from_local_datetime(&NaiveDateTime::new(
                     NaiveDate::from_ymd(2020, 6, 8),
@@ -1328,7 +1328,7 @@ fn date_proto_to_utc_string() -> Result<(), Box<dyn std::error::Error>> {
         "let dt = new Date(Date.UTC(2020, 06, 08, 09, 16, 15, 779)); dt.toUTCString()",
     )
     .expect("Successful eval");
-    assert_eq!(Value::string("Wed, 08 Jul 2020 09:16:15 GMT"), actual);
+    assert_eq!(JsValue::new("Wed, 08 Jul 2020 09:16:15 GMT"), actual);
 
     Ok(())
 }
@@ -1342,7 +1342,7 @@ fn date_proto_value_of() -> Result<(), Box<dyn std::error::Error>> {
         "new Date(Date.UTC(2020, 06, 08, 09, 16, 15, 779)).valueOf()",
     )
     .expect("Successful eval");
-    assert_eq!(Value::number(1594199775779f64), actual);
+    assert_eq!(JsValue::new(1594199775779f64), actual);
 
     Ok(())
 }
@@ -1356,7 +1356,7 @@ fn date_neg() -> Result<(), Box<dyn std::error::Error>> {
         "-new Date(Date.UTC(2020, 06, 08, 09, 16, 15, 779))",
     )
     .expect("Successful eval");
-    assert_eq!(Value::number(-1594199775779f64), actual);
+    assert_eq!(JsValue::new(-1594199775779f64), actual);
 
     Ok(())
 }
@@ -1371,7 +1371,7 @@ fn date_json() -> Result<(), Box<dyn std::error::Error>> {
     )
     .expect("Successful eval");
     assert_eq!(
-        Value::string(r#"{"date":"2020-07-08T09:16:15.779Z"}"#),
+        JsValue::new(r#"{"date":"2020-07-08T09:16:15.779Z"}"#),
         actual
     );
 

boa/src/builtins/error/eval.rs

@@ -17,7 +17,7 @@ use crate::{
     object::{ConstructorBuilder, ObjectData},
     profiler::BoaProfiler,
     property::Attribute,
-    Context, Result, Value,
+    Context, JsValue, Result,
 };
 
 /// JavaScript `EvalError` impleentation.
@@ -31,7 +31,7 @@ impl BuiltIn for EvalError {
         Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE
     }
 
-    fn init(context: &mut Context) -> (&'static str, Value, Attribute) {
+    fn init(context: &mut Context) -> (&'static str, JsValue, Attribute) {
         let _timer = BoaProfiler::global().start_event(Self::NAME, "init");
 
         let error_prototype = context.standard_objects().error_object().prototype();
@@ -58,10 +58,10 @@ impl EvalError {
 
     /// Create a new error object.
     pub(crate) fn constructor(
-        new_target: &Value,
-        args: &[Value],
+        new_target: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         let prototype = new_target
             .as_object()
             .and_then(|obj| {
@@ -73,7 +73,7 @@ impl EvalError {
             .unwrap_or_else(|| context.standard_objects().error_object().prototype());
         let obj = context.construct_object();
         obj.set_prototype_instance(prototype.into());
-        let this = Value::from(obj);
+        let this = JsValue::new(obj);
         if let Some(message) = args.get(0) {
             if !message.is_undefined() {
                 this.set_field("message", message.to_string(context)?, false, context)?;

boa/src/builtins/error/mod.rs

@@ -15,7 +15,7 @@ use crate::{
     object::{ConstructorBuilder, ObjectData, PROTOTYPE},
     profiler::BoaProfiler,
     property::Attribute,
-    Context, Result, Value,
+    Context, JsValue, Result,
 };
 
 pub(crate) mod eval;
@@ -46,7 +46,7 @@ impl BuiltIn for Error {
         Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE
     }
 
-    fn init(context: &mut Context) -> (&'static str, Value, Attribute) {
+    fn init(context: &mut Context) -> (&'static str, JsValue, Attribute) {
         let _timer = BoaProfiler::global().start_event(Self::NAME, "init");
 
         let attribute = Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE;
@@ -74,10 +74,10 @@ impl Error {
     ///
     /// Create a new error object.
     pub(crate) fn constructor(
-        new_target: &Value,
-        args: &[Value],
+        new_target: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         let prototype = new_target
             .as_object()
             .and_then(|obj| {
@@ -89,7 +89,7 @@ impl Error {
             .unwrap_or_else(|| context.standard_objects().error_object().prototype());
         let obj = context.construct_object();
         obj.set_prototype_instance(prototype.into());
-        let this = Value::from(obj);
+        let this = JsValue::new(obj);
         if let Some(message) = args.get(0) {
             if !message.is_undefined() {
                 this.set_field("message", message.to_string(context)?, false, context)?;
@@ -113,7 +113,11 @@ impl Error {
     /// [spec]: https://tc39.es/ecma262/#sec-error.prototype.tostring
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/toString
     #[allow(clippy::wrong_self_convention)]
-    pub(crate) fn to_string(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn to_string(
+        this: &JsValue,
+        _: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         if !this.is_object() {
             return context.throw_type_error("'this' is not an Object");
         }

boa/src/builtins/error/range.rs

@@ -14,7 +14,7 @@ use crate::{
     object::{ConstructorBuilder, ObjectData, PROTOTYPE},
     profiler::BoaProfiler,
     property::Attribute,
-    Context, Result, Value,
+    Context, JsValue, Result,
 };
 
 /// JavaScript `RangeError` implementation.
@@ -28,7 +28,7 @@ impl BuiltIn for RangeError {
         Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE
     }
 
-    fn init(context: &mut Context) -> (&'static str, Value, Attribute) {
+    fn init(context: &mut Context) -> (&'static str, JsValue, Attribute) {
         let _timer = BoaProfiler::global().start_event(Self::NAME, "init");
 
         let error_prototype = context.standard_objects().error_object().prototype();
@@ -55,10 +55,10 @@ impl RangeError {
 
     /// Create a new error object.
     pub(crate) fn constructor(
-        new_target: &Value,
-        args: &[Value],
+        new_target: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         let prototype = new_target
             .as_object()
             .and_then(|obj| {
@@ -70,7 +70,7 @@ impl RangeError {
             .unwrap_or_else(|| context.standard_objects().error_object().prototype());
         let obj = context.construct_object();
         obj.set_prototype_instance(prototype.into());
-        let this = Value::from(obj);
+        let this = JsValue::new(obj);
         if let Some(message) = args.get(0) {
             if !message.is_undefined() {
                 this.set_field("message", message.to_string(context)?, false, context)?;

boa/src/builtins/error/reference.rs

@@ -14,7 +14,7 @@ use crate::{
     object::{ConstructorBuilder, ObjectData, PROTOTYPE},
     profiler::BoaProfiler,
     property::Attribute,
-    Context, Result, Value,
+    Context, JsValue, Result,
 };
 
 #[derive(Debug, Clone, Copy)]
@@ -27,7 +27,7 @@ impl BuiltIn for ReferenceError {
         Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE
     }
 
-    fn init(context: &mut Context) -> (&'static str, Value, Attribute) {
+    fn init(context: &mut Context) -> (&'static str, JsValue, Attribute) {
         let _timer = BoaProfiler::global().start_event(Self::NAME, "init");
 
         let error_prototype = context.standard_objects().error_object().prototype();
@@ -54,10 +54,10 @@ impl ReferenceError {
 
     /// Create a new error object.
     pub(crate) fn constructor(
-        new_target: &Value,
-        args: &[Value],
+        new_target: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         let prototype = new_target
             .as_object()
             .and_then(|obj| {
@@ -69,7 +69,7 @@ impl ReferenceError {
             .unwrap_or_else(|| context.standard_objects().error_object().prototype());
         let obj = context.construct_object();
         obj.set_prototype_instance(prototype.into());
-        let this = Value::from(obj);
+        let this = JsValue::new(obj);
         if let Some(message) = args.get(0) {
             if !message.is_undefined() {
                 this.set_field("message", message.to_string(context)?, false, context)?;

boa/src/builtins/error/syntax.rs

@@ -16,7 +16,7 @@ use crate::{
     object::{ConstructorBuilder, ObjectData, PROTOTYPE},
     profiler::BoaProfiler,
     property::Attribute,
-    Context, Result, Value,
+    Context, JsValue, Result,
 };
 
 /// JavaScript `SyntaxError` impleentation.
@@ -30,7 +30,7 @@ impl BuiltIn for SyntaxError {
         Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE
     }
 
-    fn init(context: &mut Context) -> (&'static str, Value, Attribute) {
+    fn init(context: &mut Context) -> (&'static str, JsValue, Attribute) {
         let _timer = BoaProfiler::global().start_event(Self::NAME, "init");
 
         let error_prototype = context.standard_objects().error_object().prototype();
@@ -57,10 +57,10 @@ impl SyntaxError {
 
     /// Create a new error object.
     pub(crate) fn constructor(
-        new_target: &Value,
-        args: &[Value],
+        new_target: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         let prototype = new_target
             .as_object()
             .and_then(|obj| {
@@ -72,7 +72,7 @@ impl SyntaxError {
             .unwrap_or_else(|| context.standard_objects().error_object().prototype());
         let obj = context.construct_object();
         obj.set_prototype_instance(prototype.into());
-        let this = Value::from(obj);
+        let this = JsValue::new(obj);
         if let Some(message) = args.get(0) {
             if !message.is_undefined() {
                 this.set_field("message", message.to_string(context)?, false, context)?;

boa/src/builtins/error/type.rs

@@ -19,7 +19,7 @@ use crate::{
     builtins::BuiltIn,
     object::{ConstructorBuilder, ObjectData, PROTOTYPE},
     property::Attribute,
-    BoaProfiler, Context, Result, Value,
+    BoaProfiler, Context, JsValue, Result,
 };
 
 /// JavaScript `TypeError` implementation.
@@ -33,7 +33,7 @@ impl BuiltIn for TypeError {
         Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE
     }
 
-    fn init(context: &mut Context) -> (&'static str, Value, Attribute) {
+    fn init(context: &mut Context) -> (&'static str, JsValue, Attribute) {
         let _timer = BoaProfiler::global().start_event(Self::NAME, "init");
 
         let error_prototype = context.standard_objects().error_object().prototype();
@@ -60,10 +60,10 @@ impl TypeError {
 
     /// Create a new error object.
     pub(crate) fn constructor(
-        new_target: &Value,
-        args: &[Value],
+        new_target: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         let prototype = new_target
             .as_object()
             .and_then(|obj| {
@@ -75,7 +75,7 @@ impl TypeError {
             .unwrap_or_else(|| context.standard_objects().error_object().prototype());
         let obj = context.construct_object();
         obj.set_prototype_instance(prototype.into());
-        let this = Value::from(obj);
+        let this = JsValue::new(obj);
         if let Some(message) = args.get(0) {
             if !message.is_undefined() {
                 this.set_field("message", message.to_string(context)?, false, context)?;

boa/src/builtins/error/uri.rs

@@ -15,7 +15,7 @@ use crate::{
     object::{ConstructorBuilder, ObjectData, PROTOTYPE},
     profiler::BoaProfiler,
     property::Attribute,
-    Context, Result, Value,
+    Context, JsValue, Result,
 };
 
 /// JavaScript `URIError` impleentation.
@@ -29,7 +29,7 @@ impl BuiltIn for UriError {
         Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE
     }
 
-    fn init(context: &mut Context) -> (&'static str, Value, Attribute) {
+    fn init(context: &mut Context) -> (&'static str, JsValue, Attribute) {
         let _timer = BoaProfiler::global().start_event(Self::NAME, "init");
 
         let error_prototype = context.standard_objects().error_object().prototype();
@@ -56,10 +56,10 @@ impl UriError {
 
     /// Create a new error object.
     pub(crate) fn constructor(
-        new_target: &Value,
-        args: &[Value],
+        new_target: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         let prototype = new_target
             .as_object()
             .and_then(|obj| {
@@ -71,7 +71,7 @@ impl UriError {
             .unwrap_or_else(|| context.standard_objects().error_object().prototype());
         let obj = context.construct_object();
         obj.set_prototype_instance(prototype.into());
-        let this = Value::from(obj);
+        let this = JsValue::new(obj);
         if let Some(message) = args.get(0) {
             if !message.is_undefined() {
                 this.set_field("message", message.to_string(context)?, false, context)?;

boa/src/builtins/function/mod.rs

@@ -19,7 +19,7 @@ use crate::{
     object::{ConstructorBuilder, FunctionBuilder, GcObject, Object, ObjectData},
     property::{Attribute, PropertyDescriptor},
     syntax::ast::node::{FormalParameter, RcStatementList},
-    BoaProfiler, Context, Result, Value,
+    BoaProfiler, Context, JsValue, Result,
 };
 use bitflags::bitflags;
 use std::fmt::{self, Debug};
@@ -29,10 +29,10 @@ use std::rc::Rc;
 mod tests;
 
 /// _fn(this, arguments, context) -> ResultValue_ - The signature of a native built-in function
-pub type NativeFunction = fn(&Value, &[Value], &mut Context) -> Result<Value>;
+pub type NativeFunction = fn(&JsValue, &[JsValue], &mut Context) -> Result<JsValue>;
 
 /// _fn(this, arguments, context) -> ResultValue_ - The signature of a closure built-in function
-pub type ClosureFunction = dyn Fn(&Value, &[Value], &mut Context) -> Result<Value>;
+pub type ClosureFunction = dyn Fn(&JsValue, &[JsValue], &mut Context) -> Result<JsValue>;
 
 #[derive(Clone, Copy, Finalize)]
 pub struct BuiltInFunction(pub(crate) NativeFunction);
@@ -124,7 +124,7 @@ impl Function {
         &self,
         param: &FormalParameter,
         index: usize,
-        args_list: &[Value],
+        args_list: &[JsValue],
         context: &mut Context,
         local_env: &Environment,
     ) {
@@ -149,7 +149,7 @@ impl Function {
     pub(crate) fn add_arguments_to_environment(
         &self,
         param: &FormalParameter,
-        value: Value,
+        value: JsValue,
         local_env: &Environment,
         context: &mut Context,
     ) {
@@ -177,7 +177,7 @@ impl Function {
 /// Arguments.
 ///
 /// <https://tc39.es/ecma262/#sec-createunmappedargumentsobject>
-pub fn create_unmapped_arguments_object(arguments_list: &[Value]) -> Value {
+pub fn create_unmapped_arguments_object(arguments_list: &[JsValue]) -> JsValue {
     let len = arguments_list.len();
     let obj = GcObject::new(Object::default());
     // Set length
@@ -201,7 +201,7 @@ pub fn create_unmapped_arguments_object(arguments_list: &[Value]) -> Value {
         index += 1;
     }
 
-    Value::from(obj)
+    JsValue::new(obj)
 }
 
 /// Creates a new member function of a `Object` or `prototype`.
@@ -268,7 +268,7 @@ pub struct BuiltInFunctionObject;
 impl BuiltInFunctionObject {
     pub const LENGTH: usize = 1;
 
-    fn constructor(new_target: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    fn constructor(new_target: &JsValue, _: &[JsValue], context: &mut Context) -> Result<JsValue> {
         let prototype = new_target
             .as_object()
             .and_then(|obj| {
@@ -278,21 +278,21 @@ impl BuiltInFunctionObject {
             })
             .transpose()?
             .unwrap_or_else(|| context.standard_objects().object_object().prototype());
-        let this = Value::new_object(context);
+        let this = JsValue::new_object(context);
 
         this.as_object()
             .expect("this should be an object")
             .set_prototype_instance(prototype.into());
 
         this.set_data(ObjectData::Function(Function::Native {
-            function: BuiltInFunction(|_, _, _| Ok(Value::undefined())),
+            function: BuiltInFunction(|_, _, _| Ok(JsValue::undefined())),
             constructable: true,
         }));
         Ok(this)
     }
 
-    fn prototype(_: &Value, _: &[Value], _: &mut Context) -> Result<Value> {
-        Ok(Value::undefined())
+    fn prototype(_: &JsValue, _: &[JsValue], _: &mut Context) -> Result<JsValue> {
+        Ok(JsValue::undefined())
     }
 
     /// `Function.prototype.call`
@@ -305,11 +305,11 @@ impl BuiltInFunctionObject {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-function.prototype.call
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/call
-    fn call(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    fn call(this: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         if !this.is_function() {
             return context.throw_type_error(format!("{} is not a function", this.display()));
         }
-        let this_arg: Value = args.get(0).cloned().unwrap_or_default();
+        let this_arg: JsValue = args.get(0).cloned().unwrap_or_default();
         // TODO?: 3. Perform PrepareForTailCall
         let start = if !args.is_empty() { 1 } else { 0 };
         context.call(this, &this_arg, &args[start..])
@@ -326,7 +326,7 @@ impl BuiltInFunctionObject {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-function.prototype.apply
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/apply
-    fn apply(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    fn apply(this: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         if !this.is_function() {
             return context.throw_type_error(format!("{} is not a function", this.display()));
         }
@@ -352,7 +352,7 @@ impl BuiltIn for BuiltInFunctionObject {
         Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE
     }
 
-    fn init(context: &mut Context) -> (&'static str, Value, Attribute) {
+    fn init(context: &mut Context) -> (&'static str, JsValue, Attribute) {
         let _timer = BoaProfiler::global().start_event("function", "init");
 
         let function_prototype = context.standard_objects().function_object().prototype();

boa/src/builtins/global_this/mod.rs

@@ -10,7 +10,7 @@
 //! [spec]: https://tc39.es/ecma262/#sec-globalthis
 //! [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/globalThis
 
-use crate::{builtins::BuiltIn, property::Attribute, BoaProfiler, Context, Value};
+use crate::{builtins::BuiltIn, property::Attribute, BoaProfiler, Context, JsValue};
 
 #[cfg(test)]
 mod tests;
@@ -25,7 +25,7 @@ impl BuiltIn for GlobalThis {
         Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE
     }
 
-    fn init(context: &mut Context) -> (&'static str, Value, Attribute) {
+    fn init(context: &mut Context) -> (&'static str, JsValue, Attribute) {
         let _timer = BoaProfiler::global().start_event(Self::NAME, "init");
 
         (

boa/src/builtins/infinity/mod.rs

@@ -12,7 +12,7 @@
 #[cfg(test)]
 mod tests;
 
-use crate::{builtins::BuiltIn, property::Attribute, BoaProfiler, Context, Value};
+use crate::{builtins::BuiltIn, property::Attribute, BoaProfiler, Context, JsValue};
 
 /// JavaScript global `Infinity` property.
 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
@@ -25,7 +25,7 @@ impl BuiltIn for Infinity {
         Attribute::READONLY | Attribute::NON_ENUMERABLE | Attribute::PERMANENT
     }
 
-    fn init(_: &mut Context) -> (&'static str, Value, Attribute) {
+    fn init(_: &mut Context) -> (&'static str, JsValue, Attribute) {
         let _timer = BoaProfiler::global().start_event(Self::NAME, "init");
 
         (Self::NAME, f64::INFINITY.into(), Self::attribute())

boa/src/builtins/iterable/mod.rs

@@ -6,7 +6,7 @@ use crate::{
     },
     object::{GcObject, ObjectInitializer},
     symbol::WellKnownSymbols,
-    BoaProfiler, Context, Result, Value,
+    BoaProfiler, Context, JsValue, Result,
 };
 
 #[derive(Debug, Default)]
@@ -85,7 +85,7 @@ impl IteratorPrototypes {
 /// CreateIterResultObject( value, done )
 ///
 /// Generates an object supporting the IteratorResult interface.
-pub fn create_iter_result_object(context: &mut Context, value: Value, done: bool) -> Value {
+pub fn create_iter_result_object(context: &mut Context, value: JsValue, done: bool) -> JsValue {
     // 1. Assert: Type(done) is Boolean.
     // 2. Let obj be ! OrdinaryObjectCreate(%Object.prototype%).
     let obj = context.construct_object();
@@ -101,7 +101,7 @@ pub fn create_iter_result_object(context: &mut Context, value: Value, done: bool
 }
 
 /// Get an iterator record
-pub fn get_iterator(context: &mut Context, iterable: Value) -> Result<IteratorRecord> {
+pub fn get_iterator(context: &mut Context, iterable: JsValue) -> Result<IteratorRecord> {
     let iterator_function = iterable.get_field(WellKnownSymbols::iterator(), context)?;
     if iterator_function.is_null_or_undefined() {
         return Err(context.construct_type_error("Not an iterable"));
@@ -136,12 +136,12 @@ fn create_iterator_prototype(context: &mut Context) -> GcObject {
 
 #[derive(Debug)]
 pub struct IteratorRecord {
-    iterator_object: Value,
-    next_function: Value,
+    iterator_object: JsValue,
+    next_function: JsValue,
 }
 
 impl IteratorRecord {
-    pub fn new(iterator_object: Value, next_function: Value) -> Self {
+    pub fn new(iterator_object: JsValue, next_function: JsValue) -> Self {
         Self {
             iterator_object,
             next_function,
@@ -168,7 +168,11 @@ impl IteratorRecord {
     ///  - [ECMA reference][spec]
     ///
     ///  [spec]: https://tc39.es/ecma262/#sec-iteratorclose
-    pub(crate) fn close(&self, completion: Result<Value>, context: &mut Context) -> Result<Value> {
+    pub(crate) fn close(
+        &self,
+        completion: Result<JsValue>,
+        context: &mut Context,
+    ) -> Result<JsValue> {
         let mut inner_result = self.iterator_object.get_field("return", context);
 
         // 5
@@ -199,12 +203,12 @@ impl IteratorRecord {
 
 #[derive(Debug)]
 pub struct IteratorResult {
-    value: Value,
+    value: JsValue,
     done: bool,
 }
 
 impl IteratorResult {
-    fn new(value: Value, done: bool) -> Self {
+    fn new(value: JsValue, done: bool) -> Self {
         Self { value, done }
     }
 
@@ -212,7 +216,7 @@ impl IteratorResult {
         self.done
     }
 
-    pub fn value(self) -> Value {
+    pub fn value(self) -> JsValue {
         self.value
     }
 }

boa/src/builtins/json/mod.rs

@@ -20,7 +20,7 @@ use crate::{
     property::{Attribute, PropertyDescriptor, PropertyKey},
     symbol::WellKnownSymbols,
     value::IntegerOrInfinity,
-    BoaProfiler, Context, Result, Value,
+    BoaProfiler, Context, JsValue, Result,
 };
 use serde::Serialize;
 use serde_json::{self, ser::PrettyFormatter, Serializer, Value as JSONValue};
@@ -39,7 +39,7 @@ impl BuiltIn for Json {
         Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE
     }
 
-    fn init(context: &mut Context) -> (&'static str, Value, Attribute) {
+    fn init(context: &mut Context) -> (&'static str, JsValue, Attribute) {
         let _timer = BoaProfiler::global().start_event(Self::NAME, "init");
 
         let to_string_tag = WellKnownSymbols::to_string_tag();
@@ -68,19 +68,19 @@ impl Json {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-json.parse
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/parse
-    pub(crate) fn parse(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn parse(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         let arg = args
             .get(0)
             .cloned()
-            .unwrap_or_else(Value::undefined)
+            .unwrap_or_else(JsValue::undefined)
             .to_string(context)?;
 
         match serde_json::from_str::<JSONValue>(&arg) {
             Ok(json) => {
-                let j = Value::from_json(json, context);
+                let j = JsValue::from_json(json, context);
                 match args.get(1) {
                     Some(reviver) if reviver.is_function() => {
-                        let mut holder = Value::object(Object::default());
+                        let mut holder: JsValue = context.construct_object().into();
                         holder.set_field("", j, true, context)?;
                         Self::walk(reviver, context, &mut holder, &PropertyKey::from(""))
                     }
@@ -98,14 +98,14 @@ impl Json {
     ///
     /// [polyfill]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/parse
     fn walk(
-        reviver: &Value,
+        reviver: &JsValue,
         context: &mut Context,
-        holder: &mut Value,
+        holder: &mut JsValue,
         key: &PropertyKey,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         let value = holder.get_field(key.clone(), context)?;
 
-        if let Value::Object(ref object) = value {
+        if let JsValue::Object(ref object) = value {
             let keys: Vec<_> = object.borrow().properties().keys().collect();
 
             for key in keys {
@@ -140,18 +140,22 @@ impl Json {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-json.stringify
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify
-    pub(crate) fn stringify(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn stringify(
+        _: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         let object = match args.get(0) {
-            None => return Ok(Value::undefined()),
+            None => return Ok(JsValue::undefined()),
             Some(obj) => obj,
         };
         const SPACE_INDENT: &str = "          ";
         let gap = if let Some(space) = args.get(2) {
             let space = if let Some(space_obj) = space.as_object() {
                 if let Some(space) = space_obj.borrow().as_number() {
-                    Value::from(space)
+                    JsValue::new(space)
                 } else if let Some(space) = space_obj.borrow().as_string() {
-                    Value::from(space)
+                    JsValue::new(space)
                 } else {
                     space.clone()
                 }
@@ -165,14 +169,14 @@ impl Json {
                     IntegerOrInfinity::Integer(i) if i < 1 => 0,
                     IntegerOrInfinity::Integer(i) => std::cmp::min(i, 10) as usize,
                 };
-                Value::from(&SPACE_INDENT[..space_mv])
+                JsValue::new(&SPACE_INDENT[..space_mv])
             } else if let Some(string) = space.as_string() {
-                Value::from(&string[..std::cmp::min(string.len(), 10)])
+                JsValue::new(&string[..std::cmp::min(string.len(), 10)])
             } else {
-                Value::from("")
+                JsValue::new("")
             }
         } else {
-            Value::from("")
+            JsValue::new("")
         };
 
         let gap = &gap.to_string(context)?;
@@ -181,9 +185,9 @@ impl Json {
             Some(replacer) if replacer.is_object() => replacer,
             _ => {
                 if let Some(value) = object.to_json(context)? {
-                    return Ok(Value::from(json_to_pretty_string(&value, gap)));
+                    return Ok(JsValue::new(json_to_pretty_string(&value, gap)));
                 } else {
-                    return Ok(Value::undefined());
+                    return Ok(JsValue::undefined());
                 }
             }
         };
@@ -195,7 +199,7 @@ impl Json {
             object
                 .as_object()
                 .map(|obj| {
-                    let object_to_return = Value::object(Object::default());
+                    let object_to_return = JsValue::new(Object::default());
                     for key in obj.borrow().properties().keys() {
                         let val = obj.__get__(&key, obj.clone().into(), context)?;
                         let this_arg = object.clone();
@@ -205,7 +209,7 @@ impl Json {
                                 .value(context.call(
                                     replacer,
                                     &this_arg,
-                                    &[Value::from(key.clone()), val.clone()],
+                                    &[JsValue::new(key.clone()), val.clone()],
                                 )?)
                                 .writable(true)
                                 .enumerable(true)
@@ -213,12 +217,12 @@ impl Json {
                         )
                     }
                     if let Some(value) = object_to_return.to_json(context)? {
-                        Ok(Value::from(json_to_pretty_string(&value, gap)))
+                        Ok(JsValue::new(json_to_pretty_string(&value, gap)))
                     } else {
-                        Ok(Value::undefined())
+                        Ok(JsValue::undefined())
                     }
                 })
-                .ok_or_else(Value::undefined)?
+                .ok_or_else(JsValue::undefined)?
         } else if replacer_as_object.is_array() {
             let mut obj_to_return = serde_json::Map::new();
             let replacer_as_object = replacer_as_object.borrow();
@@ -245,14 +249,14 @@ impl Json {
                     }
                 }
             }
-            Ok(Value::from(json_to_pretty_string(
+            Ok(JsValue::new(json_to_pretty_string(
                 &JSONValue::Object(obj_to_return),
                 gap,
             )))
         } else if let Some(value) = object.to_json(context)? {
-            Ok(Value::from(json_to_pretty_string(&value, gap)))
+            Ok(JsValue::new(json_to_pretty_string(&value, gap)))
         } else {
-            Ok(Value::undefined())
+            Ok(JsValue::undefined())
         }
     }
 }

boa/src/builtins/json/tests.rs

@@ -1,4 +1,4 @@
-use crate::{forward, forward_val, Context, Value};
+use crate::{forward, forward_val, Context, JsValue};
 
 #[test]
 fn json_sanity() {
@@ -418,18 +418,21 @@ fn json_parse_sets_prototypes() {
         .as_object()
         .unwrap()
         .prototype_instance();
-    let global_object_prototype: Value = context
+    let global_object_prototype: JsValue = context
         .standard_objects()
         .object_object()
         .prototype()
         .into();
-    let global_array_prototype: Value =
+    let global_array_prototype: JsValue =
         context.standard_objects().array_object().prototype().into();
-    assert!(Value::same_value(
+    assert!(JsValue::same_value(
         &object_prototype,
         &global_object_prototype
     ));
-    assert!(Value::same_value(&array_prototype, &global_array_prototype));
+    assert!(JsValue::same_value(
+        &array_prototype,
+        &global_array_prototype
+    ));
 }
 
 #[test]

boa/src/builtins/map/map_iterator.rs

@@ -1,5 +1,5 @@
 use crate::{
-    builtins::{function::make_builtin_fn, iterable::create_iter_result_object, Array, Value},
+    builtins::{function::make_builtin_fn, iterable::create_iter_result_object, Array, JsValue},
     object::{GcObject, ObjectData},
     property::PropertyDescriptor,
     symbol::WellKnownSymbols,
@@ -24,7 +24,7 @@ pub enum MapIterationKind {
 /// [spec]: https://tc39.es/ecma262/#sec-array-iterator-objects
 #[derive(Debug, Clone, Finalize, Trace)]
 pub struct MapIterator {
-    iterated_map: Value,
+    iterated_map: JsValue,
     map_next_index: usize,
     map_iteration_kind: MapIterationKind,
     lock: MapLock,
@@ -34,7 +34,7 @@ impl MapIterator {
     pub(crate) const NAME: &'static str = "MapIterator";
 
     /// Constructs a new `MapIterator`, that will iterate over `map`, starting at index 0
-    fn new(map: Value, kind: MapIterationKind, context: &mut Context) -> Result<Self> {
+    fn new(map: JsValue, kind: MapIterationKind, context: &mut Context) -> Result<Self> {
         let lock = Map::lock(&map, context)?;
         Ok(MapIterator {
             iterated_map: map,
@@ -54,10 +54,10 @@ impl MapIterator {
     /// [spec]: https://www.ecma-international.org/ecma-262/11.0/index.html#sec-createmapiterator
     pub(crate) fn create_map_iterator(
         context: &mut Context,
-        map: Value,
+        map: JsValue,
         kind: MapIterationKind,
-    ) -> Result<Value> {
-        let map_iterator = Value::new_object(context);
+    ) -> Result<JsValue> {
+        let map_iterator = JsValue::new_object(context);
         map_iterator.set_data(ObjectData::MapIterator(Self::new(map, kind, context)?));
         map_iterator
             .as_object()
@@ -74,8 +74,8 @@ impl MapIterator {
     ///  - [ECMA reference][spec]
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-%mapiteratorprototype%.next
-    pub(crate) fn next(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
-        if let Value::Object(ref object) = this {
+    pub(crate) fn next(this: &JsValue, _: &[JsValue], context: &mut Context) -> Result<JsValue> {
+        if let JsValue::Object(ref object) = this {
             let mut object = object.borrow_mut();
             if let Some(map_iterator) = object.as_map_iterator_mut() {
                 let m = &map_iterator.iterated_map;
@@ -83,10 +83,14 @@ impl MapIterator {
                 let item_kind = &map_iterator.map_iteration_kind;
 
                 if map_iterator.iterated_map.is_undefined() {
-                    return Ok(create_iter_result_object(context, Value::undefined(), true));
+                    return Ok(create_iter_result_object(
+                        context,
+                        JsValue::undefined(),
+                        true,
+                    ));
                 }
 
-                if let Value::Object(ref object) = m {
+                if let JsValue::Object(ref object) = m {
                     if let Some(entries) = object.borrow().as_map_ref() {
                         let num_entries = entries.full_len();
                         while index < num_entries {
@@ -129,8 +133,12 @@ impl MapIterator {
                     return Err(context.construct_type_error("'this' is not a Map"));
                 }
 
-                map_iterator.iterated_map = Value::undefined();
-                Ok(create_iter_result_object(context, Value::undefined(), true))
+                map_iterator.iterated_map = JsValue::undefined();
+                Ok(create_iter_result_object(
+                    context,
+                    JsValue::undefined(),
+                    true,
+                ))
             } else {
                 context.throw_type_error("`this` is not an MapIterator")
             }
@@ -145,7 +153,7 @@ impl MapIterator {
     ///  - [ECMA reference][spec]
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-%mapiteratorprototype%-object
-    pub(crate) fn create_prototype(context: &mut Context, iterator_prototype: Value) -> GcObject {
+    pub(crate) fn create_prototype(context: &mut Context, iterator_prototype: JsValue) -> GcObject {
         let _timer = BoaProfiler::global().start_event(Self::NAME, "init");
 
         // Create prototype

boa/src/builtins/map/mod.rs

@@ -17,7 +17,7 @@ use crate::{
     object::{ConstructorBuilder, FunctionBuilder, ObjectData, PROTOTYPE},
     property::{Attribute, PropertyDescriptor},
     symbol::WellKnownSymbols,
-    BoaProfiler, Context, Result, Value,
+    BoaProfiler, Context, JsValue, Result,
 };
 use ordered_map::OrderedMap;
 
@@ -31,7 +31,7 @@ pub mod ordered_map;
 mod tests;
 
 #[derive(Debug, Clone)]
-pub(crate) struct Map(OrderedMap<Value>);
+pub(crate) struct Map(OrderedMap<JsValue>);
 
 impl BuiltIn for Map {
     const NAME: &'static str = "Map";
@@ -40,7 +40,7 @@ impl BuiltIn for Map {
         Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE
     }
 
-    fn init(context: &mut Context) -> (&'static str, Value, Attribute) {
+    fn init(context: &mut Context) -> (&'static str, JsValue, Attribute) {
         let _timer = BoaProfiler::global().start_event(Self::NAME, "init");
 
         let to_string_tag = WellKnownSymbols::to_string_tag();
@@ -104,10 +104,10 @@ impl Map {
 
     /// Create a new map
     pub(crate) fn constructor(
-        new_target: &Value,
-        args: &[Value],
+        new_target: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         if new_target.is_undefined() {
             return context
                 .throw_type_error("calling a builtin Map constructor without new is forbidden");
@@ -125,13 +125,13 @@ impl Map {
 
         let obj = context.construct_object();
         obj.set_prototype_instance(prototype.into());
-        let this = Value::from(obj);
+        let this = JsValue::new(obj);
 
         // add our arguments in
         let data = match args.len() {
             0 => OrderedMap::new(),
             _ => match &args[0] {
-                Value::Object(object) => {
+                JsValue::Object(object) => {
                     let object = object.borrow();
                     if let Some(map) = object.as_map_ref().cloned() {
                         map
@@ -182,7 +182,7 @@ impl Map {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-get-map-@@species
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/@@species
-    fn get_species(this: &Value, _: &[Value], _: &mut Context) -> Result<Value> {
+    fn get_species(this: &JsValue, _: &[JsValue], _: &mut Context) -> Result<JsValue> {
         // 1. Return the this value.
         Ok(this.clone())
     }
@@ -197,7 +197,7 @@ impl Map {
     ///
     /// [spec]: https://www.ecma-international.org/ecma-262/11.0/index.html#sec-map.prototype.entries
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/entries
-    pub(crate) fn entries(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn entries(this: &JsValue, _: &[JsValue], context: &mut Context) -> Result<JsValue> {
         MapIterator::create_map_iterator(context, this.clone(), MapIterationKind::KeyAndValue)
     }
 
@@ -211,12 +211,12 @@ impl Map {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-map.prototype.keys
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/keys
-    pub(crate) fn keys(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn keys(this: &JsValue, _: &[JsValue], context: &mut Context) -> Result<JsValue> {
         MapIterator::create_map_iterator(context, this.clone(), MapIterationKind::Key)
     }
 
     /// Helper function to set the size property.
-    fn set_size(this: &Value, size: usize) {
+    fn set_size(this: &JsValue, size: usize) {
         let size = PropertyDescriptor::builder()
             .value(size)
             .writable(false)
@@ -236,10 +236,10 @@ impl Map {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-map.prototype.set
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/set
-    pub(crate) fn set(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn set(this: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         let (key, value) = match args.len() {
-            0 => (Value::Undefined, Value::Undefined),
-            1 => (args[0].clone(), Value::Undefined),
+            0 => (JsValue::undefined(), JsValue::undefined()),
+            1 => (args[0].clone(), JsValue::undefined()),
             _ => (args[0].clone(), args[1].clone()),
         };
 
@@ -268,16 +268,16 @@ impl Map {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-map.prototype.delete
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/delete
-    pub(crate) fn delete(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
-        let undefined = Value::Undefined;
-        let key = match args.len() {
-            0 => &undefined,
-            _ => &args[0],
-        };
+    pub(crate) fn delete(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
+        let key = args.get(0).cloned().unwrap_or_default();
 
         let (deleted, size) = if let Some(object) = this.as_object() {
             if let Some(map) = object.borrow_mut().as_map_mut() {
-                let deleted = map.remove(key).is_some();
+                let deleted = map.remove(&key).is_some();
                 (deleted, map.len())
             } else {
                 return Err(context.construct_type_error("'this' is not a Map"));
@@ -299,20 +299,16 @@ impl Map {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-map.prototype.get
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/get
-    pub(crate) fn get(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
-        let undefined = Value::Undefined;
-        let key = match args.len() {
-            0 => &undefined,
-            _ => &args[0],
-        };
+    pub(crate) fn get(this: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
+        let key = args.get(0).cloned().unwrap_or_default();
 
-        if let Value::Object(ref object) = this {
+        if let JsValue::Object(ref object) = this {
             let object = object.borrow();
             if let Some(map) = object.as_map_ref() {
-                return Ok(if let Some(result) = map.get(key) {
+                return Ok(if let Some(result) = map.get(&key) {
                     result.clone()
                 } else {
-                    Value::Undefined
+                    JsValue::undefined()
                 });
             }
         }
@@ -330,12 +326,12 @@ impl Map {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-map.prototype.clear
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/clear
-    pub(crate) fn clear(this: &Value, _: &[Value], _: &mut Context) -> Result<Value> {
+    pub(crate) fn clear(this: &JsValue, _: &[JsValue], _: &mut Context) -> Result<JsValue> {
         this.set_data(ObjectData::Map(OrderedMap::new()));
 
         Self::set_size(this, 0);
 
-        Ok(Value::Undefined)
+        Ok(JsValue::undefined())
     }
 
     /// `Map.prototype.has( key )`
@@ -348,17 +344,13 @@ impl Map {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-map.prototype.has
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/has
-    pub(crate) fn has(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
-        let undefined = Value::Undefined;
-        let key = match args.len() {
-            0 => &undefined,
-            _ => &args[0],
-        };
+    pub(crate) fn has(this: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
+        let key = args.get(0).cloned().unwrap_or_default();
 
-        if let Value::Object(ref object) = this {
+        if let JsValue::Object(ref object) = this {
             let object = object.borrow();
             if let Some(map) = object.as_map_ref() {
-                return Ok(map.contains_key(key).into());
+                return Ok(map.contains_key(&key).into());
             }
         }
 
@@ -375,20 +367,24 @@ impl Map {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-map.prototype.foreach
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/forEach
-    pub(crate) fn for_each(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn for_each(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         if args.is_empty() {
-            return Err(Value::from("Missing argument for Map.prototype.forEach"));
+            return Err(JsValue::new("Missing argument for Map.prototype.forEach"));
         }
 
         let callback_arg = &args[0];
-        let this_arg = args.get(1).cloned().unwrap_or_else(Value::undefined);
+        let this_arg = args.get(1).cloned().unwrap_or_else(JsValue::undefined);
 
         let mut index = 0;
 
         let lock = Map::lock(this, context)?;
 
         while index < Map::get_full_len(this, context)? {
-            let arguments = if let Value::Object(ref object) = this {
+            let arguments = if let JsValue::Object(ref object) = this {
                 let object = object.borrow();
                 if let Some(map) = object.as_map_ref() {
                     if let Some((key, value)) = map.get_index(index) {
@@ -412,12 +408,12 @@ impl Map {
 
         drop(lock);
 
-        Ok(Value::Undefined)
+        Ok(JsValue::undefined())
     }
 
     /// Helper function to get the full size of the map.
-    fn get_full_len(map: &Value, context: &mut Context) -> Result<usize> {
-        if let Value::Object(ref object) = map {
+    fn get_full_len(map: &JsValue, context: &mut Context) -> Result<usize> {
+        if let JsValue::Object(ref object) = map {
             let object = object.borrow();
             if let Some(map) = object.as_map_ref() {
                 Ok(map.full_len())
@@ -430,8 +426,8 @@ impl Map {
     }
 
     /// Helper function to lock the map.
-    fn lock(map: &Value, context: &mut Context) -> Result<MapLock> {
-        if let Value::Object(ref object) = map {
+    fn lock(map: &JsValue, context: &mut Context) -> Result<MapLock> {
+        if let JsValue::Object(ref object) = map {
             let mut map = object.borrow_mut();
             if let Some(map) = map.as_map_mut() {
                 Ok(map.lock(object.clone()))
@@ -453,18 +449,18 @@ impl Map {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-map.prototype.values
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/values
-    pub(crate) fn values(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn values(this: &JsValue, _: &[JsValue], context: &mut Context) -> Result<JsValue> {
         MapIterator::create_map_iterator(context, this.clone(), MapIterationKind::Value)
     }
 
     /// Helper function to get a key-value pair from an array.
-    fn get_key_value(value: &Value, context: &mut Context) -> Result<Option<(Value, Value)>> {
-        if let Value::Object(object) = value {
+    fn get_key_value(value: &JsValue, context: &mut Context) -> Result<Option<(JsValue, JsValue)>> {
+        if let JsValue::Object(object) = value {
             if object.is_array() {
                 let (key, value) =
                     match value.get_field("length", context)?.as_number().unwrap() as i32 {
-                        0 => (Value::Undefined, Value::Undefined),
-                        1 => (value.get_field("0", context)?, Value::Undefined),
+                        0 => (JsValue::undefined(), JsValue::undefined()),
+                        1 => (value.get_field("0", context)?, JsValue::undefined()),
                         _ => (
                             value.get_field("0", context)?,
                             value.get_field("1", context)?,

boa/src/builtins/map/ordered_map.rs

@@ -1,7 +1,7 @@
 use crate::{
     gc::{custom_trace, Finalize, Trace},
     object::GcObject,
-    Value,
+    JsValue,
 };
 use indexmap::{Equivalent, IndexMap};
 use std::{
@@ -12,7 +12,7 @@ use std::{
 
 #[derive(PartialEq, Eq, Clone, Debug)]
 enum MapKey {
-    Key(Value),
+    Key(JsValue),
     Empty(usize), // Necessary to ensure empty keys are still unique.
 }
 
@@ -27,7 +27,7 @@ impl Hash for MapKey {
     }
 }
 
-impl Equivalent<MapKey> for Value {
+impl Equivalent<MapKey> for JsValue {
     fn equivalent(&self, key: &MapKey) -> bool {
         match key {
             MapKey::Key(v) => v == self,
@@ -116,7 +116,7 @@ impl<V> OrderedMap<V> {
     /// inserted, last in order, and `None` is returned.
     ///
     /// Computes in **O(1)** time (amortized average).
-    pub fn insert(&mut self, key: Value, value: V) -> Option<V> {
+    pub fn insert(&mut self, key: JsValue, value: V) -> Option<V> {
         self.map.insert(MapKey::Key(key), Some(value)).flatten()
     }
 
@@ -130,7 +130,7 @@ impl<V> OrderedMap<V> {
     /// Return `None` if `key` is not in map.
     ///
     /// Computes in **O(n)** time (average).
-    pub fn remove(&mut self, key: &Value) -> Option<V> {
+    pub fn remove(&mut self, key: &JsValue) -> Option<V> {
         if self.lock == 0 {
             self.map.shift_remove(key).flatten()
         } else if self.map.contains_key(key) {
@@ -146,14 +146,14 @@ impl<V> OrderedMap<V> {
     /// else `None`.
     ///
     /// Computes in **O(1)** time (average).
-    pub fn get(&self, key: &Value) -> Option<&V> {
+    pub fn get(&self, key: &JsValue) -> Option<&V> {
         self.map.get(key).map(Option::as_ref).flatten()
     }
 
     /// Get a key-value pair by index
     /// Valid indices are 0 <= index < self.full_len()
     /// Computes in O(1) time.
-    pub fn get_index(&self, index: usize) -> Option<(&Value, &V)> {
+    pub fn get_index(&self, index: usize) -> Option<(&JsValue, &V)> {
         if let (MapKey::Key(key), Some(value)) = self.map.get_index(index)? {
             Some((key, value))
         } else {
@@ -162,7 +162,7 @@ impl<V> OrderedMap<V> {
     }
 
     /// Return an iterator over the key-value pairs of the map, in their order
-    pub fn iter(&self) -> impl Iterator<Item = (&Value, &V)> {
+    pub fn iter(&self) -> impl Iterator<Item = (&JsValue, &V)> {
         self.map.iter().filter_map(|o| {
             if let (MapKey::Key(key), Some(value)) = o {
                 Some((key, value))
@@ -175,7 +175,7 @@ impl<V> OrderedMap<V> {
     /// Return `true` if an equivalent to `key` exists in the map.
     ///
     /// Computes in **O(1)** time (average).
-    pub fn contains_key(&self, key: &Value) -> bool {
+    pub fn contains_key(&self, key: &JsValue) -> bool {
         self.map.contains_key(key)
     }
 

boa/src/builtins/math/mod.rs

@@ -13,7 +13,7 @@
 
 use crate::{
     builtins::BuiltIn, object::ObjectInitializer, property::Attribute, symbol::WellKnownSymbols,
-    BoaProfiler, Context, Result, Value,
+    BoaProfiler, Context, JsValue, Result,
 };
 
 #[cfg(test)]
@@ -30,7 +30,7 @@ impl BuiltIn for Math {
         Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE
     }
 
-    fn init(context: &mut Context) -> (&'static str, Value, Attribute) {
+    fn init(context: &mut Context) -> (&'static str, JsValue, Attribute) {
         let _timer = BoaProfiler::global().start_event(Self::NAME, "init");
 
         let attribute = Attribute::READONLY | Attribute::NON_ENUMERABLE | Attribute::PERMANENT;
@@ -99,7 +99,7 @@ impl Math {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-math.abs
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/abs
-    pub(crate) fn abs(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn abs(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         Ok(args
             .get(0)
             .map(|x| x.to_number(context))
@@ -116,7 +116,7 @@ impl Math {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-math.acos
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/acos
-    pub(crate) fn acos(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn acos(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         Ok(args
             .get(0)
             .map(|x| x.to_number(context))
@@ -133,7 +133,7 @@ impl Math {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-math.acosh
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/acosh
-    pub(crate) fn acosh(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn acosh(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         Ok(args
             .get(0)
             .map(|x| x.to_number(context))
@@ -150,7 +150,7 @@ impl Math {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-math.asin
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/asin
-    pub(crate) fn asin(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn asin(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         Ok(args
             .get(0)
             .map(|x| x.to_number(context))
@@ -167,7 +167,7 @@ impl Math {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-math.asinh
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/asinh
-    pub(crate) fn asinh(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn asinh(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         Ok(args
             .get(0)
             .map(|x| x.to_number(context))
@@ -184,7 +184,7 @@ impl Math {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-math.atan
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/atan
-    pub(crate) fn atan(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn atan(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         Ok(args
             .get(0)
             .map(|x| x.to_number(context))
@@ -201,7 +201,7 @@ impl Math {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-math.atanh
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/atanh
-    pub(crate) fn atanh(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn atanh(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         Ok(args
             .get(0)
             .map(|x| x.to_number(context))
@@ -218,7 +218,7 @@ impl Math {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-math.atan2
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/atan2
-    pub(crate) fn atan2(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn atan2(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         Ok(match (
             args.get(0).map(|x| x.to_number(context)).transpose()?,
             args.get(1).map(|x| x.to_number(context)).transpose()?,
@@ -237,7 +237,7 @@ impl Math {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-math.cbrt
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/cbrt
-    pub(crate) fn cbrt(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn cbrt(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         Ok(args
             .get(0)
             .map(|x| x.to_number(context))
@@ -254,7 +254,7 @@ impl Math {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-math.ceil
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/ceil
-    pub(crate) fn ceil(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn ceil(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         Ok(args
             .get(0)
             .map(|x| x.to_number(context))
@@ -271,7 +271,7 @@ impl Math {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-math.clz32
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/clz32
-    pub(crate) fn clz32(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn clz32(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         Ok(args
             .get(0)
             .map(|x| x.to_u32(context))
@@ -289,7 +289,7 @@ impl Math {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-math.cos
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/cos
-    pub(crate) fn cos(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn cos(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         Ok(args
             .get(0)
             .map(|x| x.to_number(context))
@@ -306,7 +306,7 @@ impl Math {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-math.cosh
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/cosh
-    pub(crate) fn cosh(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn cosh(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         Ok(args
             .get(0)
             .map(|x| x.to_number(context))
@@ -323,7 +323,7 @@ impl Math {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-math.exp
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/exp
-    pub(crate) fn exp(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn exp(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         Ok(args
             .get(0)
             .map(|x| x.to_number(context))
@@ -342,7 +342,7 @@ impl Math {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-math.expm1
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/expm1
-    pub(crate) fn expm1(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn expm1(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         Ok(args
             .get(0)
             .map(|x| x.to_number(context))
@@ -359,7 +359,7 @@ impl Math {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-math.floor
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/floor
-    pub(crate) fn floor(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn floor(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         Ok(args
             .get(0)
             .map(|x| x.to_number(context))
@@ -376,7 +376,7 @@ impl Math {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-math.fround
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/fround
-    pub(crate) fn fround(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn fround(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         Ok(args
             .get(0)
             .map(|x| x.to_number(context))
@@ -393,7 +393,7 @@ impl Math {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-math.hypot
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/hypot
-    pub(crate) fn hypot(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn hypot(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         let mut result = 0f64;
         for arg in args {
             let x = arg.to_number(context)?;
@@ -410,7 +410,7 @@ impl Math {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-math.imul
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/imul
-    pub(crate) fn imul(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn imul(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         Ok(match (
             args.get(0).map(|x| x.to_u32(context)).transpose()?,
             args.get(1).map(|x| x.to_u32(context)).transpose()?,
@@ -429,7 +429,7 @@ impl Math {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-math.log
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/log
-    pub(crate) fn log(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn log(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         Ok(args
             .get(0)
             .map(|x| x.to_number(context))
@@ -446,7 +446,7 @@ impl Math {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-math.log1p
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/log1p
-    pub(crate) fn log1p(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn log1p(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         Ok(args
             .get(0)
             .map(|x| x.to_number(context))
@@ -463,7 +463,7 @@ impl Math {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-math.log10
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/log10
-    pub(crate) fn log10(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn log10(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         Ok(args
             .get(0)
             .map(|x| x.to_number(context))
@@ -480,7 +480,7 @@ impl Math {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-math.log2
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/log2
-    pub(crate) fn log2(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn log2(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         Ok(args
             .get(0)
             .map(|x| x.to_number(context))
@@ -497,7 +497,7 @@ impl Math {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-math.max
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/max
-    pub(crate) fn max(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn max(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         let mut max = f64::NEG_INFINITY;
         for arg in args {
             let num = arg.to_number(context)?;
@@ -514,7 +514,7 @@ impl Math {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-math.min
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/min
-    pub(crate) fn min(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn min(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         let mut min = f64::INFINITY;
         for arg in args {
             let num = arg.to_number(context)?;
@@ -531,7 +531,7 @@ impl Math {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-math.pow
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/pow
-    pub(crate) fn pow(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn pow(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         Ok(match (
             args.get(0).map(|x| x.to_number(context)).transpose()?,
             args.get(1).map(|x| x.to_number(context)).transpose()?,
@@ -550,7 +550,7 @@ impl Math {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-math.random
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/random
-    pub(crate) fn random(_: &Value, _: &[Value], _: &mut Context) -> Result<Value> {
+    pub(crate) fn random(_: &JsValue, _: &[JsValue], _: &mut Context) -> Result<JsValue> {
         Ok(rand::random::<f64>().into())
     }
 
@@ -562,7 +562,7 @@ impl Math {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-math.round
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/round
-    pub(crate) fn round(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn round(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         Ok(args
             .get(0)
             .map(|x| x.to_number(context))
@@ -579,7 +579,7 @@ impl Math {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-math.sign
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/sign
-    pub(crate) fn sign(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn sign(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         Ok(args
             .get(0)
             .map(|x| x.to_number(context))
@@ -605,7 +605,7 @@ impl Math {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-math.sin
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/sin
-    pub(crate) fn sin(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn sin(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         Ok(args
             .get(0)
             .map(|x| x.to_number(context))
@@ -622,7 +622,7 @@ impl Math {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-math.sinh
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/sinh
-    pub(crate) fn sinh(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn sinh(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         Ok(args
             .get(0)
             .map(|x| x.to_number(context))
@@ -639,7 +639,7 @@ impl Math {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-math.sqrt
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/sqrt
-    pub(crate) fn sqrt(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn sqrt(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         Ok(args
             .get(0)
             .map(|x| x.to_number(context))
@@ -656,7 +656,7 @@ impl Math {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-math.tan
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/tan
-    pub(crate) fn tan(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn tan(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         Ok(args
             .get(0)
             .map(|x| x.to_number(context))
@@ -673,7 +673,7 @@ impl Math {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-math.tanh
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/tanh
-    pub(crate) fn tanh(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn tanh(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         Ok(args
             .get(0)
             .map(|x| x.to_number(context))
@@ -690,7 +690,7 @@ impl Math {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-math.trunc
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc
-    pub(crate) fn trunc(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn trunc(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         Ok(args
             .get(0)
             .map(|x| x.to_number(context))

boa/src/builtins/mod.rs

@@ -54,7 +54,7 @@ pub(crate) use self::{
 };
 use crate::{
     property::{Attribute, PropertyDescriptor},
-    Context, Value,
+    Context, JsValue,
 };
 
 pub(crate) trait BuiltIn {
@@ -62,7 +62,7 @@ pub(crate) trait BuiltIn {
     const NAME: &'static str;
 
     fn attribute() -> Attribute;
-    fn init(context: &mut Context) -> (&'static str, Value, Attribute);
+    fn init(context: &mut Context) -> (&'static str, JsValue, Attribute);
 }
 
 /// Initializes builtin objects and functions

boa/src/builtins/nan/mod.rs

@@ -13,7 +13,7 @@
 #[cfg(test)]
 mod tests;
 
-use crate::{builtins::BuiltIn, property::Attribute, BoaProfiler, Context, Value};
+use crate::{builtins::BuiltIn, property::Attribute, BoaProfiler, Context, JsValue};
 
 /// JavaScript global `NaN` property.
 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
@@ -26,7 +26,7 @@ impl BuiltIn for NaN {
         Attribute::READONLY | Attribute::NON_ENUMERABLE | Attribute::PERMANENT
     }
 
-    fn init(_: &mut Context) -> (&'static str, Value, Attribute) {
+    fn init(_: &mut Context) -> (&'static str, JsValue, Attribute) {
         let _timer = BoaProfiler::global().start_event(Self::NAME, "init");
 
         (Self::NAME, f64::NAN.into(), Self::attribute())

boa/src/builtins/number/mod.rs

@@ -19,7 +19,7 @@ use crate::{
     builtins::BuiltIn,
     object::{ConstructorBuilder, ObjectData, PROTOTYPE},
     property::Attribute,
-    value::{AbstractRelation, IntegerOrInfinity, Value},
+    value::{AbstractRelation, IntegerOrInfinity, JsValue},
     BoaProfiler, Context, Result,
 };
 use num_traits::{float::FloatCore, Num};
@@ -50,7 +50,7 @@ impl BuiltIn for Number {
         Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE
     }
 
-    fn init(context: &mut Context) -> (&'static str, Value, Attribute) {
+    fn init(context: &mut Context) -> (&'static str, JsValue, Attribute) {
         let _timer = BoaProfiler::global().start_event(Self::NAME, "init");
 
         let attribute = Attribute::READONLY | Attribute::NON_ENUMERABLE | Attribute::PERMANENT;
@@ -155,16 +155,16 @@ impl Number {
 
     /// `Number( value )`
     pub(crate) fn constructor(
-        new_target: &Value,
-        args: &[Value],
+        new_target: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         let data = match args.get(0) {
             Some(value) => value.to_numeric_number(context)?,
             None => 0.0,
         };
         if new_target.is_undefined() {
-            return Ok(Value::from(data));
+            return Ok(JsValue::new(data));
         }
         let prototype = new_target
             .as_object()
@@ -175,7 +175,7 @@ impl Number {
             })
             .transpose()?
             .unwrap_or_else(|| context.standard_objects().object_object().prototype());
-        let this = Value::new_object(context);
+        let this = JsValue::new_object(context);
         this.as_object()
             .expect("this should be an object")
             .set_prototype_instance(prototype.into());
@@ -193,11 +193,11 @@ impl Number {
     ///  - [ECMAScript reference][spec]
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-thisnumbervalue
-    fn this_number_value(value: &Value, context: &mut Context) -> Result<f64> {
+    fn this_number_value(value: &JsValue, context: &mut Context) -> Result<f64> {
         match *value {
-            Value::Integer(integer) => return Ok(f64::from(integer)),
-            Value::Rational(rational) => return Ok(rational),
-            Value::Object(ref object) => {
+            JsValue::Integer(integer) => return Ok(f64::from(integer)),
+            JsValue::Rational(rational) => return Ok(rational),
+            JsValue::Object(ref object) => {
                 if let Some(number) = object.borrow().as_number() {
                     return Ok(number);
                 }
@@ -229,13 +229,13 @@ impl Number {
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toExponential
     #[allow(clippy::wrong_self_convention)]
     pub(crate) fn to_exponential(
-        this: &Value,
-        _: &[Value],
+        this: &JsValue,
+        _: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         let this_num = Self::this_number_value(this, context)?;
         let this_str_num = Self::num_to_exponential(this_num);
-        Ok(Value::from(this_str_num))
+        Ok(JsValue::new(this_str_num))
     }
 
     /// `Number.prototype.toFixed( [digits] )`
@@ -249,7 +249,11 @@ impl Number {
     /// [spec]: https://tc39.es/ecma262/#sec-number.prototype.tofixed
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toFixed
     #[allow(clippy::wrong_self_convention)]
-    pub(crate) fn to_fixed(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn to_fixed(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         let this_num = Self::this_number_value(this, context)?;
         let precision = match args.get(0) {
             Some(n) => match n.to_integer(context)? as i32 {
@@ -259,7 +263,7 @@ impl Number {
             None => 0,
         };
         let this_fixed_num = format!("{:.*}", precision, this_num);
-        Ok(Value::from(this_fixed_num))
+        Ok(JsValue::new(this_fixed_num))
     }
 
     /// `Number.prototype.toLocaleString( [locales [, options]] )`
@@ -277,13 +281,13 @@ impl Number {
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toLocaleString
     #[allow(clippy::wrong_self_convention)]
     pub(crate) fn to_locale_string(
-        this: &Value,
-        _: &[Value],
+        this: &JsValue,
+        _: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         let this_num = Self::this_number_value(this, context)?;
         let this_str_num = format!("{}", this_num);
-        Ok(Value::from(this_str_num))
+        Ok(JsValue::new(this_str_num))
     }
 
     /// flt_str_to_exp - used in to_precision
@@ -384,16 +388,16 @@ impl Number {
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toPrecision
     #[allow(clippy::wrong_self_convention)]
     pub(crate) fn to_precision(
-        this: &Value,
-        args: &[Value],
+        this: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         let precision = args.get(0).cloned().unwrap_or_default();
 
         // 1 & 6
         let mut this_num = Self::this_number_value(this, context)?;
         // 2
-        if precision == Value::undefined() {
+        if precision == JsValue::undefined() {
             return Self::to_string(this, &[], context);
         }
 
@@ -467,14 +471,14 @@ impl Number {
                 // iv, v
                 suffix.push_str(&exponent.to_string());
 
-                return Ok(Value::from(prefix + &suffix));
+                return Ok(JsValue::new(prefix + &suffix));
             }
         }
 
         // 11
         let e_inc = exponent + 1;
         if e_inc == precision_i32 {
-            return Ok(Value::from(prefix + &suffix));
+            return Ok(JsValue::new(prefix + &suffix));
         }
 
         // 12
@@ -488,7 +492,7 @@ impl Number {
         }
 
         // 14
-        Ok(Value::from(prefix + &suffix))
+        Ok(JsValue::new(prefix + &suffix))
     }
 
     // https://golang.org/src/math/nextafter.go
@@ -630,7 +634,11 @@ impl Number {
     /// [spec]: https://tc39.es/ecma262/#sec-number.prototype.tostring
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toString
     #[allow(clippy::wrong_self_convention)]
-    pub(crate) fn to_string(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn to_string(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         // 1. Let x be ? thisNumberValue(this value).
         let x = Self::this_number_value(this, context)?;
 
@@ -650,17 +658,17 @@ impl Number {
 
         // 5. If radixNumber = 10, return ! ToString(x).
         if radix == 10 {
-            return Ok(Value::from(Self::to_native_string(x)));
+            return Ok(JsValue::new(Self::to_native_string(x)));
         }
 
         if x == -0. {
-            return Ok(Value::from("0"));
+            return Ok(JsValue::new("0"));
         } else if x.is_nan() {
-            return Ok(Value::from("NaN"));
+            return Ok(JsValue::new("NaN"));
         } else if x.is_infinite() && x.is_sign_positive() {
-            return Ok(Value::from("Infinity"));
+            return Ok(JsValue::new("Infinity"));
         } else if x.is_infinite() && x.is_sign_negative() {
-            return Ok(Value::from("-Infinity"));
+            return Ok(JsValue::new("-Infinity"));
         }
 
         // This is a Optimization from the v8 source code to print values that can fit in a single character
@@ -672,7 +680,7 @@ impl Number {
         // }
 
         // 6. Return the String representation of this Number value using the radix specified by radixNumber.
-        Ok(Value::from(Self::to_native_string_radix(x, radix)))
+        Ok(JsValue::new(Self::to_native_string_radix(x, radix)))
     }
 
     /// `Number.prototype.toString()`
@@ -685,8 +693,12 @@ impl Number {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-number.prototype.valueof
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/valueOf
-    pub(crate) fn value_of(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
-        Ok(Value::from(Self::this_number_value(this, context)?))
+    pub(crate) fn value_of(
+        this: &JsValue,
+        _: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
+        Ok(JsValue::new(Self::this_number_value(this, context)?))
     }
 
     /// Builtin javascript 'parseInt(str, radix)' function.
@@ -703,7 +715,11 @@ impl Number {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-parseint-string-radix
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/parseInt
-    pub(crate) fn parse_int(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn parse_int(
+        _: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         if let (Some(val), radix) = (args.get(0), args.get(1)) {
             // 1. Let inputString be ? ToString(string).
             let input_string = val.to_string(context)?;
@@ -738,7 +754,7 @@ impl Number {
             if var_r != 0 {
                 //     a. If R < 2 or R > 36, return NaN.
                 if !(2..=36).contains(&var_r) {
-                    return Ok(Value::nan());
+                    return Ok(JsValue::nan());
                 }
 
                 //     b. If R ≠ 16, set stripPrefix to false.
@@ -777,7 +793,7 @@ impl Number {
 
             // 13. If Z is empty, return NaN.
             if var_z.is_empty() {
-                return Ok(Value::nan());
+                return Ok(JsValue::nan());
             }
 
             // 14. Let mathInt be the integer value that is represented by Z in radix-R notation, using the
@@ -796,17 +812,17 @@ impl Number {
             //     b. Return +0𝔽.
             if math_int == 0_f64 {
                 if sign == -1 {
-                    return Ok(Value::rational(-0_f64));
+                    return Ok(JsValue::new(-0_f64));
                 } else {
-                    return Ok(Value::rational(0_f64));
+                    return Ok(JsValue::new(0_f64));
                 }
             }
 
             // 16. Return 𝔽(sign × mathInt).
-            Ok(Value::rational(f64::from(sign) * math_int))
+            Ok(JsValue::new(f64::from(sign) * math_int))
         } else {
             // Not enough arguments to parseInt.
-            Ok(Value::nan())
+            Ok(JsValue::nan())
         }
     }
 
@@ -825,7 +841,11 @@ impl Number {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-parsefloat-string
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/parseFloat
-    pub(crate) fn parse_float(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn parse_float(
+        _: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         if let Some(val) = args.get(0) {
             let input_string = val.to_string(context)?;
             let s = input_string.trim_start_matches(is_trimmable_whitespace);
@@ -833,29 +853,29 @@ impl Number {
 
             // TODO: write our own lexer to match syntax StrDecimalLiteral
             if s.starts_with("Infinity") || s.starts_with("+Infinity") {
-                Ok(Value::from(f64::INFINITY))
+                Ok(JsValue::new(f64::INFINITY))
             } else if s.starts_with("-Infinity") {
-                Ok(Value::from(f64::NEG_INFINITY))
+                Ok(JsValue::new(f64::NEG_INFINITY))
             } else if s_prefix_lower.starts_with("inf")
                 || s_prefix_lower.starts_with("+inf")
                 || s_prefix_lower.starts_with("-inf")
             {
                 // Prevent fast_float from parsing "inf", "+inf" as Infinity and "-inf" as -Infinity
-                Ok(Value::nan())
+                Ok(JsValue::nan())
             } else {
                 Ok(fast_float::parse_partial::<f64, _>(s)
                     .map(|(f, len)| {
                         if len > 0 {
-                            Value::rational(f)
+                            JsValue::new(f)
                         } else {
-                            Value::nan()
+                            JsValue::nan()
                         }
                     })
-                    .unwrap_or_else(|_| Value::nan()))
+                    .unwrap_or_else(|_| JsValue::nan()))
             }
         } else {
             // Not enough arguments to parseFloat.
-            Ok(Value::nan())
+            Ok(JsValue::nan())
         }
     }
 
@@ -874,10 +894,10 @@ impl Number {
     /// [spec]: https://tc39.es/ecma262/#sec-isfinite-number
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/isFinite
     pub(crate) fn global_is_finite(
-        _: &Value,
-        args: &[Value],
+        _: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         if let Some(value) = args.get(0) {
             let number = value.to_number(context)?;
             Ok(number.is_finite().into())
@@ -900,7 +920,11 @@ impl Number {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-isnan-number
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/isNaN
-    pub(crate) fn global_is_nan(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn global_is_nan(
+        _: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         if let Some(value) = args.get(0) {
             let number = value.to_number(context)?;
             Ok(number.is_nan().into())
@@ -923,11 +947,15 @@ impl Number {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-number.isfinite
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite
-    pub(crate) fn number_is_finite(_: &Value, args: &[Value], _ctx: &mut Context) -> Result<Value> {
-        Ok(Value::from(if let Some(val) = args.get(0) {
+    pub(crate) fn number_is_finite(
+        _: &JsValue,
+        args: &[JsValue],
+        _ctx: &mut Context,
+    ) -> Result<JsValue> {
+        Ok(JsValue::new(if let Some(val) = args.get(0) {
             match val {
-                Value::Integer(_) => true,
-                Value::Rational(number) => number.is_finite(),
+                JsValue::Integer(_) => true,
+                JsValue::Rational(number) => number.is_finite(),
                 _ => false,
             }
         } else {
@@ -946,10 +974,10 @@ impl Number {
     /// [spec]: https://tc39.es/ecma262/#sec-number.isinteger
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isInteger
     pub(crate) fn number_is_integer(
-        _: &Value,
-        args: &[Value],
+        _: &JsValue,
+        args: &[JsValue],
         _ctx: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         Ok(args.get(0).map_or(false, Self::is_integer).into())
     }
 
@@ -967,11 +995,15 @@ impl Number {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-isnan-number
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN
-    pub(crate) fn number_is_nan(_: &Value, args: &[Value], _ctx: &mut Context) -> Result<Value> {
-        Ok(Value::from(if let Some(val) = args.get(0) {
+    pub(crate) fn number_is_nan(
+        _: &JsValue,
+        args: &[JsValue],
+        _ctx: &mut Context,
+    ) -> Result<JsValue> {
+        Ok(JsValue::new(if let Some(val) = args.get(0) {
             match val {
-                Value::Integer(_) => false,
-                Value::Rational(number) => number.is_nan(),
+                JsValue::Integer(_) => false,
+                JsValue::Rational(number) => number.is_nan(),
                 _ => false,
             }
         } else {
@@ -993,10 +1025,14 @@ impl Number {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-isnan-number
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN
-    pub(crate) fn is_safe_integer(_: &Value, args: &[Value], _ctx: &mut Context) -> Result<Value> {
-        Ok(Value::from(match args.get(0) {
-            Some(Value::Integer(_)) => true,
-            Some(Value::Rational(number)) if Self::is_float_integer(*number) => {
+    pub(crate) fn is_safe_integer(
+        _: &JsValue,
+        args: &[JsValue],
+        _ctx: &mut Context,
+    ) -> Result<JsValue> {
+        Ok(JsValue::new(match args.get(0) {
+            Some(JsValue::Integer(_)) => true,
+            Some(JsValue::Rational(number)) if Self::is_float_integer(*number) => {
                 number.abs() <= Number::MAX_SAFE_INTEGER
             }
             _ => false,
@@ -1010,10 +1046,10 @@ impl Number {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-isinteger
     #[inline]
-    pub(crate) fn is_integer(val: &Value) -> bool {
+    pub(crate) fn is_integer(val: &JsValue) -> bool {
         match val {
-            Value::Integer(_) => true,
-            Value::Rational(number) => Number::is_float_integer(*number),
+            JsValue::Integer(_) => true,
+            JsValue::Rational(number) => Number::is_float_integer(*number),
             _ => false,
         }
     }

boa/src/builtins/object/for_in_iterator.rs

@@ -5,7 +5,7 @@ use crate::{
     property::PropertyDescriptor,
     property::PropertyKey,
     symbol::WellKnownSymbols,
-    BoaProfiler, Context, JsString, Result, Value,
+    BoaProfiler, Context, JsString, JsValue, Result,
 };
 use rustc_hash::FxHashSet;
 use std::collections::VecDeque;
@@ -19,7 +19,7 @@ use std::collections::VecDeque;
 /// [spec]: https://tc39.es/ecma262/#sec-for-in-iterator-objects
 #[derive(Debug, Clone, Finalize, Trace)]
 pub struct ForInIterator {
-    object: Value,
+    object: JsValue,
     visited_keys: FxHashSet<JsString>,
     remaining_keys: VecDeque<JsString>,
     object_was_visited: bool,
@@ -28,7 +28,7 @@ pub struct ForInIterator {
 impl ForInIterator {
     pub(crate) const NAME: &'static str = "ForInIterator";
 
-    fn new(object: Value) -> Self {
+    fn new(object: JsValue) -> Self {
         ForInIterator {
             object,
             visited_keys: FxHashSet::default(),
@@ -45,8 +45,8 @@ impl ForInIterator {
     ///  - [ECMA reference][spec]
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-createforiniterator
-    pub(crate) fn create_for_in_iterator(context: &Context, object: Value) -> Value {
-        let for_in_iterator = Value::new_object(context);
+    pub(crate) fn create_for_in_iterator(context: &Context, object: JsValue) -> JsValue {
+        let for_in_iterator = JsValue::new_object(context);
         for_in_iterator.set_data(ObjectData::ForInIterator(Self::new(object)));
         for_in_iterator
             .as_object()
@@ -63,8 +63,8 @@ impl ForInIterator {
     ///  - [ECMA reference][spec]
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-%foriniteratorprototype%.next
-    pub(crate) fn next(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
-        if let Value::Object(ref o) = this {
+    pub(crate) fn next(this: &JsValue, _: &[JsValue], context: &mut Context) -> Result<JsValue> {
+        if let JsValue::Object(ref o) = this {
             let mut for_in_iterator = o.borrow_mut();
             if let Some(iterator) = for_in_iterator.as_for_in_iterator_mut() {
                 let mut object = iterator.object.to_object(context)?;
@@ -93,7 +93,7 @@ impl ForInIterator {
                                 if desc.expect_enumerable() {
                                     return Ok(create_iter_result_object(
                                         context,
-                                        Value::from(r.to_string()),
+                                        JsValue::new(r.to_string()),
                                         false,
                                     ));
                                 }
@@ -105,10 +105,14 @@ impl ForInIterator {
                             object = o;
                         }
                         _ => {
-                            return Ok(create_iter_result_object(context, Value::undefined(), true))
+                            return Ok(create_iter_result_object(
+                                context,
+                                JsValue::undefined(),
+                                true,
+                            ))
                         }
                     }
-                    iterator.object = Value::from(object.clone());
+                    iterator.object = JsValue::new(object.clone());
                     iterator.object_was_visited = false;
                 }
             } else {
@@ -125,7 +129,7 @@ impl ForInIterator {
     ///  - [ECMA reference][spec]
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-%foriniteratorprototype%-object
-    pub(crate) fn create_prototype(context: &mut Context, iterator_prototype: Value) -> GcObject {
+    pub(crate) fn create_prototype(context: &mut Context, iterator_prototype: JsValue) -> GcObject {
         let _timer = BoaProfiler::global().start_event(Self::NAME, "init");
 
         // Create prototype

boa/src/builtins/object/mod.rs

@@ -20,7 +20,7 @@ use crate::{
     },
     property::{Attribute, DescriptorKind, PropertyDescriptor},
     symbol::WellKnownSymbols,
-    value::{Type, Value},
+    value::{JsValue, Type},
     BoaProfiler, Context, Result,
 };
 
@@ -39,7 +39,7 @@ impl BuiltIn for Object {
         Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE
     }
 
-    fn init(context: &mut Context) -> (&'static str, Value, Attribute) {
+    fn init(context: &mut Context) -> (&'static str, JsValue, Attribute) {
         let _timer = BoaProfiler::global().start_event(Self::NAME, "init");
 
         let object = ConstructorBuilder::with_standard_object(
@@ -49,7 +49,7 @@ impl BuiltIn for Object {
         )
         .name(Self::NAME)
         .length(Self::LENGTH)
-        .inherit(Value::null())
+        .inherit(JsValue::null())
         .method(Self::has_own_property, "hasOwnProperty", 0)
         .method(Self::property_is_enumerable, "propertyIsEnumerable", 0)
         .method(Self::to_string, "toString", 0)
@@ -80,7 +80,11 @@ impl BuiltIn for Object {
 impl Object {
     const LENGTH: usize = 1;
 
-    fn constructor(new_target: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    fn constructor(
+        new_target: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         if !new_target.is_undefined() {
             let prototype = new_target
                 .as_object()
@@ -91,7 +95,7 @@ impl Object {
                 })
                 .transpose()?
                 .unwrap_or_else(|| context.standard_objects().object_object().prototype());
-            let object = Value::new_object(context);
+            let object = JsValue::new_object(context);
 
             object
                 .as_object()
@@ -104,7 +108,7 @@ impl Object {
                 return Ok(arg.to_object(context)?.into());
             }
         }
-        Ok(Value::new_object(context))
+        Ok(JsValue::new_object(context))
     }
 
     /// `Object.create( proto, [propertiesObject] )`
@@ -117,12 +121,12 @@ impl Object {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-object.create
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/create
-    pub fn create(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
-        let prototype = args.get(0).cloned().unwrap_or_else(Value::undefined);
-        let properties = args.get(1).cloned().unwrap_or_else(Value::undefined);
+    pub fn create(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
+        let prototype = args.get(0).cloned().unwrap_or_else(JsValue::undefined);
+        let properties = args.get(1).cloned().unwrap_or_else(JsValue::undefined);
 
         let obj = match prototype {
-            Value::Object(_) | Value::Null => Value::object(BuiltinObject::with_prototype(
+            JsValue::Object(_) | JsValue::Null => JsValue::new(BuiltinObject::with_prototype(
                 prototype,
                 ObjectData::Ordinary,
             )),
@@ -135,7 +139,7 @@ impl Object {
         };
 
         if !properties.is_undefined() {
-            return Object::define_properties(&Value::Undefined, &[obj, properties], context);
+            return Object::define_properties(&JsValue::undefined(), &[obj, properties], context);
         }
 
         Ok(obj)
@@ -152,13 +156,13 @@ impl Object {
     /// [spec]: https://tc39.es/ecma262/#sec-object.getownpropertydescriptor
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyDescriptor
     pub fn get_own_property_descriptor(
-        _: &Value,
-        args: &[Value],
+        _: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         let object = args
             .get(0)
-            .unwrap_or(&Value::undefined())
+            .unwrap_or(&JsValue::undefined())
             .to_object(context)?;
         if let Some(key) = args.get(1) {
             let key = key.to_property_key(context)?;
@@ -168,7 +172,7 @@ impl Object {
             }
         }
 
-        Ok(Value::undefined())
+        Ok(JsValue::undefined())
     }
 
     /// `Object.getOwnPropertyDescriptors( object )`
@@ -182,13 +186,13 @@ impl Object {
     /// [spec]: https://tc39.es/ecma262/#sec-object.getownpropertydescriptors
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyDescriptors
     pub fn get_own_property_descriptors(
-        _: &Value,
-        args: &[Value],
+        _: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         let object = args
             .get(0)
-            .unwrap_or(&Value::undefined())
+            .unwrap_or(&JsValue::undefined())
             .to_object(context)?;
         let descriptors = context.construct_object();
 
@@ -212,7 +216,7 @@ impl Object {
             }
         }
 
-        Ok(Value::Object(descriptors))
+        Ok(JsValue::Object(descriptors))
     }
 
     /// The abstract operation `FromPropertyDescriptor`.
@@ -220,7 +224,7 @@ impl Object {
     /// [ECMAScript reference][spec]
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-frompropertydescriptor
-    fn from_property_descriptor(desc: PropertyDescriptor, context: &mut Context) -> Value {
+    fn from_property_descriptor(desc: PropertyDescriptor, context: &mut Context) -> JsValue {
         let mut descriptor = ObjectInitializer::new(context);
 
         // TODO: use CreateDataPropertyOrThrow
@@ -257,15 +261,15 @@ impl Object {
     }
 
     /// Uses the SameValue algorithm to check equality of objects
-    pub fn is(_: &Value, args: &[Value], _: &mut Context) -> Result<Value> {
-        let x = args.get(0).cloned().unwrap_or_else(Value::undefined);
-        let y = args.get(1).cloned().unwrap_or_else(Value::undefined);
+    pub fn is(_: &JsValue, args: &[JsValue], _: &mut Context) -> Result<JsValue> {
+        let x = args.get(0).cloned().unwrap_or_else(JsValue::undefined);
+        let y = args.get(1).cloned().unwrap_or_else(JsValue::undefined);
 
-        Ok(Value::same_value(&x, &y).into())
+        Ok(JsValue::same_value(&x, &y).into())
     }
 
     /// Get the `prototype` of an object.
-    pub fn get_prototype_of(_: &Value, args: &[Value], ctx: &mut Context) -> Result<Value> {
+    pub fn get_prototype_of(_: &JsValue, args: &[JsValue], ctx: &mut Context) -> Result<JsValue> {
         if args.is_empty() {
             return ctx.throw_type_error(
                 "Object.getPrototypeOf: At least 1 argument required, but only 0 passed",
@@ -284,7 +288,7 @@ impl Object {
     /// [More information][spec]
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-object.setprototypeof
-    pub fn set_prototype_of(_: &Value, args: &[Value], ctx: &mut Context) -> Result<Value> {
+    pub fn set_prototype_of(_: &JsValue, args: &[JsValue], ctx: &mut Context) -> Result<JsValue> {
         if args.len() < 2 {
             return ctx.throw_type_error(format!(
                 "Object.setPrototypeOf: At least 2 arguments required, but only {} passed",
@@ -339,35 +343,43 @@ impl Object {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-object.prototype.isprototypeof
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isPrototypeOf
-    pub fn is_prototype_of(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
-        let undefined = Value::undefined();
+    pub fn is_prototype_of(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
+        let undefined = JsValue::undefined();
         let mut v = args.get(0).unwrap_or(&undefined).clone();
         if !v.is_object() {
-            return Ok(Value::Boolean(false));
+            return Ok(JsValue::new(false));
         }
-        let o = Value::from(this.to_object(context)?);
+        let o = JsValue::new(this.to_object(context)?);
         loop {
             v = Self::get_prototype_of(this, &[v], context)?;
             if v.is_null() {
-                return Ok(Value::Boolean(false));
+                return Ok(JsValue::new(false));
             }
-            if Value::same_value(&o, &v) {
-                return Ok(Value::Boolean(true));
+            if JsValue::same_value(&o, &v) {
+                return Ok(JsValue::new(true));
             }
         }
     }
 
     /// Define a property in an object
-    pub fn define_property(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
-        let object = args.get(0).cloned().unwrap_or_else(Value::undefined);
+    pub fn define_property(
+        _: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
+        let object = args.get(0).cloned().unwrap_or_else(JsValue::undefined);
         if let Some(object) = object.as_object() {
             let key = args
                 .get(1)
-                .unwrap_or(&Value::Undefined)
+                .unwrap_or(&JsValue::Undefined)
                 .to_property_key(context)?;
             let desc = args
                 .get(2)
-                .unwrap_or(&Value::Undefined)
+                .unwrap_or(&JsValue::Undefined)
                 .to_property_descriptor(context)?;
 
             object.define_property_or_throw(key, desc, context)?;
@@ -388,11 +400,15 @@ impl Object {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-object.defineproperties
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperties
-    pub fn define_properties(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub fn define_properties(
+        _: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         let arg = args.get(0).cloned().unwrap_or_default();
         let arg_obj = arg.as_object();
         if let Some(mut obj) = arg_obj {
-            let props = args.get(1).cloned().unwrap_or_else(Value::undefined);
+            let props = args.get(1).cloned().unwrap_or_else(JsValue::undefined);
             obj.define_properties(props, context)?;
             Ok(arg)
         } else {
@@ -410,7 +426,7 @@ impl Object {
     /// [spec]: https://tc39.es/ecma262/#sec-object.prototype.tostring
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/toString
     #[allow(clippy::wrong_self_convention)]
-    pub fn to_string(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    pub fn to_string(this: &JsValue, _: &[JsValue], context: &mut Context) -> Result<JsValue> {
         // 1. If the this value is undefined, return "[object Undefined]".
         if this.is_undefined() {
             return Ok("[object Undefined]".into());
@@ -470,10 +486,14 @@ impl Object {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-object.prototype.hasownproperty
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty
-    pub fn has_own_property(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub fn has_own_property(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         let key = args
             .get(0)
-            .unwrap_or(&Value::undefined())
+            .unwrap_or(&JsValue::undefined())
             .to_property_key(context)?;
         let object = this.to_object(context)?;
 
@@ -492,20 +512,20 @@ impl Object {
     /// [spec]: https://tc39.es/ecma262/#sec-object.prototype.propertyisenumerable
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable
     pub fn property_is_enumerable(
-        this: &Value,
-        args: &[Value],
+        this: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         let key = match args.get(0) {
-            None => return Ok(Value::from(false)),
+            None => return Ok(JsValue::new(false)),
             Some(key) => key,
         };
 
         let key = key.to_property_key(context)?;
         let own_property = this.to_object(context)?.__get_own_property__(&key);
 
-        Ok(own_property.map_or(Value::from(false), |own_prop| {
-            Value::from(own_prop.enumerable())
+        Ok(own_property.map_or(JsValue::new(false), |own_prop| {
+            JsValue::new(own_prop.enumerable())
         }))
     }
 
@@ -520,7 +540,7 @@ impl Object {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-object.assign
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign
-    pub fn assign(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub fn assign(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         //
         //
         // 1. Let to be ? ToObject(target).

boa/src/builtins/object/tests.rs

@@ -1,4 +1,4 @@
-use crate::{forward, Context, Value};
+use crate::{forward, Context, JsValue};
 
 #[test]
 fn object_create_with_regular_object() {
@@ -218,7 +218,7 @@ fn get_own_property_descriptor_1_arg_returns_undefined() {
         let obj = {a: 2};
         Object.getOwnPropertyDescriptor(obj)
     "#;
-    assert_eq!(context.eval(code).unwrap(), Value::undefined());
+    assert_eq!(context.eval(code).unwrap(), JsValue::undefined());
 }
 
 #[test]
@@ -287,5 +287,5 @@ fn object_is_prototype_of() {
         Object.prototype.isPrototypeOf(String.prototype)
     "#;
 
-    assert_eq!(context.eval(init).unwrap(), Value::boolean(true));
+    assert_eq!(context.eval(init).unwrap(), JsValue::new(true));
 }

boa/src/builtins/reflect/mod.rs

@@ -15,7 +15,7 @@ use crate::{
     object::{Object, ObjectData, ObjectInitializer},
     property::{Attribute, PropertyDescriptor},
     symbol::WellKnownSymbols,
-    BoaProfiler, Context, Result, Value,
+    BoaProfiler, Context, JsValue, Result,
 };
 
 #[cfg(test)]
@@ -32,7 +32,7 @@ impl BuiltIn for Reflect {
         Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE
     }
 
-    fn init(context: &mut Context) -> (&'static str, Value, Attribute) {
+    fn init(context: &mut Context) -> (&'static str, JsValue, Attribute) {
         let _timer = BoaProfiler::global().start_event(Self::NAME, "init");
 
         let to_string_tag = WellKnownSymbols::to_string_tag();
@@ -74,8 +74,8 @@ impl Reflect {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-reflect.apply
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/apply
-    pub(crate) fn apply(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
-        let undefined = Value::undefined();
+    pub(crate) fn apply(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
+        let undefined = JsValue::undefined();
         let target = args
             .get(0)
             .and_then(|v| v.as_object())
@@ -101,7 +101,11 @@ impl Reflect {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-reflect.construct
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/construct
-    pub(crate) fn construct(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn construct(
+        _: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         let target = args
             .get(0)
             .and_then(|v| v.as_object())
@@ -137,17 +141,17 @@ impl Reflect {
     /// [spec]: https://tc39.es/ecma262/#sec-reflect.defineProperty
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/defineProperty
     pub(crate) fn define_property(
-        _: &Value,
-        args: &[Value],
+        _: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
-        let undefined = Value::undefined();
+    ) -> Result<JsValue> {
+        let undefined = JsValue::undefined();
         let target = args
             .get(0)
             .and_then(|v| v.as_object())
             .ok_or_else(|| context.construct_type_error("target must be an object"))?;
         let key = args.get(1).unwrap_or(&undefined).to_property_key(context)?;
-        let prop_desc: Value = args
+        let prop_desc: JsValue = args
             .get(2)
             .and_then(|v| v.as_object())
             .ok_or_else(|| context.construct_type_error("property descriptor must be an object"))?
@@ -167,11 +171,11 @@ impl Reflect {
     /// [spec]: https://tc39.es/ecma262/#sec-reflect.deleteproperty
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/deleteProperty
     pub(crate) fn delete_property(
-        _: &Value,
-        args: &[Value],
+        _: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
-        let undefined = Value::undefined();
+    ) -> Result<JsValue> {
+        let undefined = JsValue::undefined();
         let target = args
             .get(0)
             .and_then(|v| v.as_object())
@@ -189,8 +193,8 @@ impl Reflect {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-reflect.get
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/get
-    pub(crate) fn get(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
-        let undefined = Value::undefined();
+    pub(crate) fn get(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
+        let undefined = JsValue::undefined();
         // 1. If Type(target) is not Object, throw a TypeError exception.
         let target = args
             .get(0)
@@ -218,17 +222,17 @@ impl Reflect {
     /// [spec]: https://tc39.es/ecma262/#sec-reflect.getownpropertydescriptor
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/getOwnPropertyDescriptor
     pub(crate) fn get_own_property_descriptor(
-        _: &Value,
-        args: &[Value],
+        _: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         match args.get(0) {
             Some(v) if v.is_object() => (),
             _ => return context.throw_type_error("target must be an object"),
         }
         // This function is the same as Object.prototype.getOwnPropertyDescriptor, that why
         // it is invoked here.
-        builtins::object::Object::get_own_property_descriptor(&Value::undefined(), args, context)
+        builtins::object::Object::get_own_property_descriptor(&JsValue::undefined(), args, context)
     }
 
     /// Gets the prototype of an object.
@@ -240,10 +244,10 @@ impl Reflect {
     /// [spec]: https://tc39.es/ecma262/#sec-reflect.getprototypeof
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/getPrototypeOf
     pub(crate) fn get_prototype_of(
-        _: &Value,
-        args: &[Value],
+        _: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         let target = args
             .get(0)
             .and_then(|v| v.as_object())
@@ -259,14 +263,14 @@ impl Reflect {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-reflect.has
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/has
-    pub(crate) fn has(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn has(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         let target = args
             .get(0)
             .and_then(|v| v.as_object())
             .ok_or_else(|| context.construct_type_error("target must be an object"))?;
         let key = args
             .get(1)
-            .unwrap_or(&Value::undefined())
+            .unwrap_or(&JsValue::undefined())
             .to_property_key(context)?;
         Ok(target.__has_property__(&key).into())
     }
@@ -279,7 +283,11 @@ impl Reflect {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-reflect.isextensible
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/isExtensible
-    pub(crate) fn is_extensible(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn is_extensible(
+        _: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         let target = args
             .get(0)
             .and_then(|v| v.as_object())
@@ -295,13 +303,17 @@ impl Reflect {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-reflect.ownkeys
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/ownKeys
-    pub(crate) fn own_keys(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn own_keys(
+        _: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         let target = args
             .get(0)
             .and_then(|v| v.as_object())
             .ok_or_else(|| context.construct_type_error("target must be an object"))?;
         let array_prototype = context.standard_objects().array_object().prototype();
-        let result: Value =
+        let result: JsValue =
             Object::with_prototype(array_prototype.into(), ObjectData::Array).into();
         result.set_property(
             "length",
@@ -329,10 +341,10 @@ impl Reflect {
     /// [spec]: https://tc39.es/ecma262/#sec-reflect.preventextensions
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/preventExtensions
     pub(crate) fn prevent_extensions(
-        _: &Value,
-        args: &[Value],
+        _: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         let mut target = args
             .get(0)
             .and_then(|v| v.as_object())
@@ -349,8 +361,8 @@ impl Reflect {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-reflect.set
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/set
-    pub(crate) fn set(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
-        let undefined = Value::undefined();
+    pub(crate) fn set(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
+        let undefined = JsValue::undefined();
         let target = args
             .get(0)
             .and_then(|v| v.as_object())
@@ -376,11 +388,11 @@ impl Reflect {
     /// [spec]: https://tc39.es/ecma262/#sec-reflect.setprototypeof
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/setPrototypeOf
     pub(crate) fn set_prototype_of(
-        _: &Value,
-        args: &[Value],
+        _: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
-        let undefined = Value::undefined();
+    ) -> Result<JsValue> {
+        let undefined = JsValue::undefined();
         let mut target = args
             .get(0)
             .and_then(|v| v.as_object())

boa/src/builtins/regexp/mod.rs

@@ -17,7 +17,7 @@ use crate::{
     object::{ConstructorBuilder, FunctionBuilder, GcObject, Object, ObjectData, PROTOTYPE},
     property::Attribute,
     symbol::WellKnownSymbols,
-    value::{IntegerOrInfinity, Value},
+    value::{IntegerOrInfinity, JsValue},
     BoaProfiler, Context, JsString, Result,
 };
 use regexp_string_iterator::RegExpStringIterator;
@@ -69,7 +69,7 @@ impl BuiltIn for RegExp {
         Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE
     }
 
-    fn init(context: &mut Context) -> (&'static str, Value, Attribute) {
+    fn init(context: &mut Context) -> (&'static str, JsValue, Attribute) {
         let _timer = BoaProfiler::global().start_event(Self::NAME, "init");
 
         let get_species = FunctionBuilder::native(context, Self::get_species)
@@ -183,15 +183,15 @@ impl RegExp {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-regexp-pattern-flags
     pub(crate) fn constructor(
-        new_target: &Value,
-        args: &[Value],
+        new_target: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
-        let pattern = args.get(0).cloned().unwrap_or_else(Value::undefined);
-        let flags = args.get(1).cloned().unwrap_or_else(Value::undefined);
+    ) -> Result<JsValue> {
+        let pattern = args.get(0).cloned().unwrap_or_else(JsValue::undefined);
+        let flags = args.get(1).cloned().unwrap_or_else(JsValue::undefined);
 
         // 1. Let patternIsRegExp be ? IsRegExp(pattern).
-        let pattern_is_regexp = if let Value::Object(obj) = &pattern {
+        let pattern_is_regexp = if let JsValue::Object(obj) = &pattern {
             if obj.is_regexp() {
                 Some(obj)
             } else {
@@ -211,7 +211,7 @@ impl RegExp {
                     // i. Let patternConstructor be ? Get(pattern, "constructor").
                     let pattern_constructor = pattern.get("constructor", context)?;
                     // ii. If SameValue(newTarget, patternConstructor) is true, return pattern.
-                    if Value::same_value(new_target, &pattern_constructor) {
+                    if JsValue::same_value(new_target, &pattern_constructor) {
                         return Ok(pattern.clone().into());
                     }
                 }
@@ -229,11 +229,11 @@ impl RegExp {
             // c. Else, let F be flags.
             if flags.is_undefined() {
                 (
-                    Value::from(regexp.original_source.clone()),
-                    Value::from(regexp.original_flags.clone()),
+                    JsValue::new(regexp.original_source.clone()),
+                    JsValue::new(regexp.original_flags.clone()),
                 )
             } else {
-                (Value::from(regexp.original_source.clone()), flags)
+                (JsValue::new(regexp.original_source.clone()), flags)
             }
         } else {
             // a. Let P be pattern.
@@ -254,7 +254,7 @@ impl RegExp {
     ///  - [ECMAScript reference][spec]
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-regexpalloc
-    fn alloc(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    fn alloc(this: &JsValue, _: &[JsValue], context: &mut Context) -> Result<JsValue> {
         let proto = if let Some(obj) = this.as_object() {
             obj.get(PROTOTYPE, context)?
         } else {
@@ -274,9 +274,9 @@ impl RegExp {
     ///  - [ECMAScript reference][spec]
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-regexpinitialize
-    fn initialize(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
-        let pattern = args.get(0).cloned().unwrap_or_else(Value::undefined);
-        let flags = args.get(1).cloned().unwrap_or_else(Value::undefined);
+    fn initialize(this: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
+        let pattern = args.get(0).cloned().unwrap_or_else(JsValue::undefined);
+        let flags = args.get(1).cloned().unwrap_or_else(JsValue::undefined);
 
         // 1. If pattern is undefined, let P be the empty String.
         // 2. Else, let P be ? ToString(pattern).
@@ -373,7 +373,7 @@ impl RegExp {
     ///  - [ECMAScript reference][spec]
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-regexpcreate
-    pub(crate) fn create(p: Value, f: Value, context: &mut Context) -> Result<Value> {
+    pub(crate) fn create(p: JsValue, f: JsValue, context: &mut Context) -> Result<JsValue> {
         // 1. Let obj be ? RegExpAlloc(%RegExp%).
         let obj = RegExp::alloc(
             &context.global_object().get(RegExp::NAME, context)?,
@@ -395,16 +395,16 @@ impl RegExp {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-get-regexp-@@species
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/@@species
-    fn get_species(this: &Value, _: &[Value], _: &mut Context) -> Result<Value> {
+    fn get_species(this: &JsValue, _: &[JsValue], _: &mut Context) -> Result<JsValue> {
         // 1. Return the this value.
         Ok(this.clone())
     }
 
     #[inline]
-    fn regexp_has_flag(this: &Value, flag: char, context: &mut Context) -> Result<Value> {
+    fn regexp_has_flag(this: &JsValue, flag: char, context: &mut Context) -> Result<JsValue> {
         if let Some(object) = this.as_object() {
             if let Some(regexp) = object.borrow().as_regexp() {
-                return Ok(Value::boolean(match flag {
+                return Ok(JsValue::new(match flag {
                     'g' => regexp.global,
                     'm' => regexp.multiline,
                     's' => regexp.dot_all,
@@ -419,7 +419,7 @@ impl RegExp {
                 &object,
                 &context.standard_objects().regexp_object().prototype,
             ) {
-                return Ok(Value::undefined());
+                return Ok(JsValue::undefined());
             }
         }
 
@@ -449,7 +449,11 @@ impl RegExp {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-get-regexp.prototype.global
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/global
-    pub(crate) fn get_global(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn get_global(
+        this: &JsValue,
+        _: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         Self::regexp_has_flag(this, 'g', context)
     }
 
@@ -464,10 +468,10 @@ impl RegExp {
     /// [spec]: https://tc39.es/ecma262/#sec-get-regexp.prototype.ignorecase
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/ignoreCase
     pub(crate) fn get_ignore_case(
-        this: &Value,
-        _: &[Value],
+        this: &JsValue,
+        _: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         Self::regexp_has_flag(this, 'i', context)
     }
 
@@ -481,7 +485,11 @@ impl RegExp {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-get-regexp.prototype.multiline
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/multiline
-    pub(crate) fn get_multiline(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn get_multiline(
+        this: &JsValue,
+        _: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         Self::regexp_has_flag(this, 'm', context)
     }
 
@@ -495,7 +503,11 @@ impl RegExp {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-get-regexp.prototype.dotAll
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/dotAll
-    pub(crate) fn get_dot_all(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn get_dot_all(
+        this: &JsValue,
+        _: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         Self::regexp_has_flag(this, 's', context)
     }
 
@@ -510,7 +522,11 @@ impl RegExp {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-get-regexp.prototype.unicode
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/unicode
-    pub(crate) fn get_unicode(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn get_unicode(
+        this: &JsValue,
+        _: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         Self::regexp_has_flag(this, 'u', context)
     }
 
@@ -525,7 +541,11 @@ impl RegExp {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-get-regexp.prototype.sticky
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/sticky
-    pub(crate) fn get_sticky(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn get_sticky(
+        this: &JsValue,
+        _: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         Self::regexp_has_flag(this, 'y', context)
     }
 
@@ -540,7 +560,11 @@ impl RegExp {
     /// [spec]: https://tc39.es/ecma262/#sec-get-regexp.prototype.flags
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/flags
     /// [flags]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions#Advanced_searching_with_flags_2
-    pub(crate) fn get_flags(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn get_flags(
+        this: &JsValue,
+        _: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         // 1. Let R be the this value.
         // 2. If Type(R) is not Object, throw a TypeError exception.
         if let Some(object) = this.as_object() {
@@ -598,7 +622,11 @@ impl RegExp {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-get-regexp.prototype.source
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/source
-    pub(crate) fn get_source(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn get_source(
+        this: &JsValue,
+        _: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         // 1. Let R be the this value.
         // 2. If Type(R) is not Object, throw a TypeError exception.
         if let Some(object) = this.as_object() {
@@ -609,11 +637,11 @@ impl RegExp {
                 None => {
                     // a. If SameValue(R, %RegExp.prototype%) is true, return "(?:)".
                     // b. Otherwise, throw a TypeError exception.
-                    if Value::same_value(
+                    if JsValue::same_value(
                         this,
-                        &Value::from(context.standard_objects().regexp_object().prototype()),
+                        &JsValue::new(context.standard_objects().regexp_object().prototype()),
                     ) {
-                        Ok(Value::from("(?:)"))
+                        Ok(JsValue::new("(?:)"))
                     } else {
                         context.throw_type_error(
                             "RegExp.prototype.source method called on incompatible value",
@@ -639,9 +667,9 @@ impl RegExp {
     ///  - [ECMAScript reference][spec]
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-escaperegexppattern
-    fn escape_pattern(src: &str, _flags: &str) -> Result<Value> {
+    fn escape_pattern(src: &str, _flags: &str) -> Result<JsValue> {
         if src.is_empty() {
-            Ok(Value::from("(?:)"))
+            Ok(JsValue::new("(?:)"))
         } else {
             let mut s = String::from("");
 
@@ -654,7 +682,7 @@ impl RegExp {
                 }
             }
 
-            Ok(Value::from(s))
+            Ok(JsValue::new(s))
         }
     }
 
@@ -670,7 +698,7 @@ impl RegExp {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-regexp.prototype.test
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/test
-    pub(crate) fn test(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn test(this: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         // 1. Let R be the this value.
         // 2. If Type(R) is not Object, throw a TypeError exception.
         if !this.is_object() {
@@ -690,9 +718,9 @@ impl RegExp {
 
         // 5. If match is not null, return true; else return false.
         if m.is_some() {
-            Ok(Value::Boolean(true))
+            Ok(JsValue::new(true))
         } else {
-            Ok(Value::Boolean(false))
+            Ok(JsValue::new(false))
         }
     }
 
@@ -708,7 +736,7 @@ impl RegExp {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-regexp.prototype.exec
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/exec
-    pub(crate) fn exec(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn exec(this: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         // 1. Let R be the this value.
         // 2. Perform ? RequireInternalSlot(R, [[RegExpMatcher]]).
         let obj = this.as_object().unwrap_or_default();
@@ -729,7 +757,7 @@ impl RegExp {
         if let Some(v) = Self::abstract_builtin_exec(obj, arg_str, context)? {
             Ok(v.into())
         } else {
-            Ok(Value::null())
+            Ok(JsValue::null())
         }
     }
 
@@ -740,7 +768,7 @@ impl RegExp {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-regexpexec
     pub(crate) fn abstract_exec(
-        this: &Value,
+        this: &JsValue,
         input: JsString,
         context: &mut Context,
     ) -> Result<Option<GcObject>> {
@@ -949,7 +977,7 @@ impl RegExp {
         let named_groups = match_value.named_groups();
         let groups = if named_groups.clone().count() > 0 {
             // a. Let groups be ! OrdinaryObjectCreate(null).
-            let groups = Value::new_object(context);
+            let groups = JsValue::new_object(context);
 
             // Perform 27.f here
             // f. If the ith capture of R was defined with a GroupName, then
@@ -972,7 +1000,7 @@ impl RegExp {
             groups
         } else {
             // a. Let groups be undefined.
-            Value::undefined()
+            JsValue::undefined()
         };
 
         // 26. Perform ! CreateDataPropertyOrThrow(A, "groups", groups).
@@ -986,7 +1014,7 @@ impl RegExp {
 
             let captured_value = match capture {
                 // b. If captureI is undefined, let capturedValue be undefined.
-                None => Value::undefined(),
+                None => JsValue::undefined(),
                 // c. Else if fullUnicode is true, then
                 // d. Else,
                 Some(range) => {
@@ -1017,7 +1045,11 @@ impl RegExp {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-regexp.prototype-@@match
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/@@match
-    pub(crate) fn r#match(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn r#match(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         // 1. Let rx be the this value.
         // 2. If Type(rx) is not Object, throw a TypeError exception.
         let rx = if let Some(rx) = this.as_object() {
@@ -1042,10 +1074,10 @@ impl RegExp {
         // 6. Else,
         if !global {
             // a. Return ? RegExpExec(rx, S).
-            if let Some(v) = Self::abstract_exec(&Value::from(rx), arg_str, context)? {
+            if let Some(v) = Self::abstract_exec(&JsValue::new(rx), arg_str, context)? {
                 Ok(v.into())
             } else {
-                Ok(Value::null())
+                Ok(JsValue::null())
             }
         } else {
             // a. Assert: global is true.
@@ -1066,7 +1098,7 @@ impl RegExp {
             loop {
                 // i. Let result be ? RegExpExec(rx, S).
                 let result =
-                    Self::abstract_exec(&Value::from(rx.clone()), arg_str.clone(), context)?;
+                    Self::abstract_exec(&JsValue::new(rx.clone()), arg_str.clone(), context)?;
 
                 // ii. If result is null, then
                 // iii. Else,
@@ -1087,7 +1119,7 @@ impl RegExp {
                         let next_index = advance_string_index(arg_str.clone(), this_index, unicode);
 
                         // c. Perform ? Set(rx, "lastIndex", 𝔽(nextIndex), true).
-                        rx.set("lastIndex", Value::from(next_index), true, context)?;
+                        rx.set("lastIndex", JsValue::new(next_index), true, context)?;
                     }
 
                     // 4. Set n to n + 1.
@@ -1096,7 +1128,7 @@ impl RegExp {
                     // 1. If n = 0, return null.
                     // 2. Return A.
                     if n == 0 {
-                        return Ok(Value::null());
+                        return Ok(JsValue::null());
                     } else {
                         return Ok(a.into());
                     }
@@ -1116,7 +1148,11 @@ impl RegExp {
     /// [spec]: https://tc39.es/ecma262/#sec-regexp.prototype.tostring
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/toString
     #[allow(clippy::wrong_self_convention)]
-    pub(crate) fn to_string(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn to_string(
+        this: &JsValue,
+        _: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         let (body, flags) = if let Some(object) = this.as_object() {
             let object = object.borrow();
             let regex = object.as_regexp().ok_or_else(|| {
@@ -1145,7 +1181,11 @@ impl RegExp {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-regexp-prototype-matchall
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/@@matchAll
-    pub(crate) fn match_all(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn match_all(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         // 1. Let R be the this value.
         // 2. If Type(R) is not Object, throw a TypeError exception.
         if !this.is_object() {
@@ -1205,7 +1245,11 @@ impl RegExp {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-regexp.prototype-@@replace
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/@@replace
-    pub(crate) fn replace(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn replace(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         // 1. Let rx be the this value.
         // 2. If Type(rx) is not Object, throw a TypeError exception.
         let rx = if let Some(rx) = this.as_object() {
@@ -1256,7 +1300,7 @@ impl RegExp {
         // 11. Repeat, while done is false,
         loop {
             // a. Let result be ? RegExpExec(rx, S).
-            let result = Self::abstract_exec(&Value::from(rx.clone()), arg_str.clone(), context)?;
+            let result = Self::abstract_exec(&JsValue::new(rx.clone()), arg_str.clone(), context)?;
 
             // b. If result is null, set done to true.
             // c. Else,
@@ -1281,7 +1325,7 @@ impl RegExp {
                         let next_index = advance_string_index(arg_str.clone(), this_index, unicode);
 
                         // c. Perform ? Set(rx, "lastIndex", 𝔽(nextIndex), true).
-                        rx.set("lastIndex", Value::from(next_index), true, context)?;
+                        rx.set("lastIndex", JsValue::new(next_index), true, context)?;
                     }
                 }
             } else {
@@ -1359,7 +1403,7 @@ impl RegExp {
             let replacement: JsString;
             if functional_replace {
                 // i. Let replacerArgs be « matched ».
-                let mut replacer_args = vec![Value::from(matched)];
+                let mut replacer_args = vec![JsValue::new(matched)];
 
                 // ii. Append in List order the elements of captures to the end of the List replacerArgs.
                 replacer_args.extend(captures);
@@ -1375,7 +1419,8 @@ impl RegExp {
                 }
 
                 // v. Let replValue be ? Call(replaceValue, undefined, replacerArgs).
-                let repl_value = context.call(&replace_value, &Value::Undefined, &replacer_args)?;
+                let repl_value =
+                    context.call(&replace_value, &JsValue::undefined(), &replacer_args)?;
 
                 // vi. Let replacement be ? ToString(replValue).
                 replacement = repl_value.to_string(context)?;
@@ -1443,7 +1488,11 @@ impl RegExp {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-regexp.prototype-@@search
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/@@search
-    pub(crate) fn search(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn search(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         // 1. Let rx be the this value.
         // 2. If Type(rx) is not Object, throw a TypeError exception.
         let rx = if let Some(rx) = this.as_object() {
@@ -1465,19 +1514,19 @@ impl RegExp {
         let previous_last_index = rx.get("lastIndex", context)?;
 
         // 5. If SameValue(previousLastIndex, +0𝔽) is false, then
-        if !Value::same_value(&previous_last_index, &Value::from(0)) {
+        if !JsValue::same_value(&previous_last_index, &JsValue::new(0)) {
             // a. Perform ? Set(rx, "lastIndex", +0𝔽, true).
             rx.set("lastIndex", 0, true, context)?;
         }
 
         // 6. Let result be ? RegExpExec(rx, S).
-        let result = Self::abstract_exec(&Value::from(rx.clone()), arg_str, context)?;
+        let result = Self::abstract_exec(&JsValue::new(rx.clone()), arg_str, context)?;
 
         // 7. Let currentLastIndex be ? Get(rx, "lastIndex").
         let current_last_index = rx.get("lastIndex", context)?;
 
         // 8. If SameValue(currentLastIndex, previousLastIndex) is false, then
-        if !Value::same_value(&current_last_index, &previous_last_index) {
+        if !JsValue::same_value(&current_last_index, &previous_last_index) {
             // a. Perform ? Set(rx, "lastIndex", previousLastIndex, true).
             rx.set("lastIndex", previous_last_index, true, context)?;
         }
@@ -1487,7 +1536,7 @@ impl RegExp {
         if let Some(result) = result {
             result.get("index", context)
         } else {
-            Ok(Value::from(-1))
+            Ok(JsValue::new(-1))
         }
     }
 
@@ -1501,7 +1550,11 @@ impl RegExp {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-regexp.prototype-@@split
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/@@split
-    pub(crate) fn split(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn split(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         // 1. Let rx be the this value.
         // 2. If Type(rx) is not Object, throw a TypeError exception.
         let rx = if let Some(rx) = this.as_object() {
@@ -1590,7 +1643,7 @@ impl RegExp {
         // 19. Repeat, while q < size,
         while q < size {
             // a. Perform ? Set(splitter, "lastIndex", 𝔽(q), true).
-            splitter.set_field("lastIndex", Value::from(q), true, context)?;
+            splitter.set_field("lastIndex", JsValue::new(q), true, context)?;
 
             // b. Let z be ? RegExpExec(splitter, S).
             let result = Self::abstract_exec(&splitter, arg_str.clone(), context)?;

boa/src/builtins/regexp/regexp_string_iterator.rs

@@ -17,13 +17,13 @@ use crate::{
     object::{GcObject, ObjectData},
     property::PropertyDescriptor,
     symbol::WellKnownSymbols,
-    BoaProfiler, Context, JsString, Result, Value,
+    BoaProfiler, Context, JsString, JsValue, Result,
 };
 
 // TODO: See todos in create_regexp_string_iterator and next.
 #[derive(Debug, Clone, Finalize, Trace)]
 pub struct RegExpStringIterator {
-    matcher: Value,
+    matcher: JsValue,
     string: JsString,
     global: bool,
     unicode: bool,
@@ -32,7 +32,7 @@ pub struct RegExpStringIterator {
 
 // TODO: See todos in create_regexp_string_iterator and next.
 impl RegExpStringIterator {
-    fn new(matcher: Value, string: JsString, global: bool, unicode: bool) -> Self {
+    fn new(matcher: JsValue, string: JsString, global: bool, unicode: bool) -> Self {
         Self {
             matcher,
             string,
@@ -49,12 +49,12 @@ impl RegExpStringIterator {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-createregexpstringiterator
     pub(crate) fn create_regexp_string_iterator(
-        matcher: &Value,
+        matcher: &JsValue,
         string: JsString,
         global: bool,
         unicode: bool,
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         // TODO: Implement this with closures and generators.
         //       For now all values of the closure are stored in RegExpStringIterator and the actual closure execution is in `.next()`.
 
@@ -66,7 +66,7 @@ impl RegExpStringIterator {
         //    and fullUnicode and performs the following steps when called:
 
         // 5. Return ! CreateIteratorFromClosure(closure, "%RegExpStringIteratorPrototype%", %RegExpStringIteratorPrototype%).
-        let regexp_string_iterator = Value::new_object(context);
+        let regexp_string_iterator = JsValue::new_object(context);
         regexp_string_iterator.set_data(ObjectData::RegExpStringIterator(Self::new(
             matcher.clone(),
             string,
@@ -86,12 +86,16 @@ impl RegExpStringIterator {
         Ok(regexp_string_iterator)
     }
 
-    pub fn next(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
-        if let Value::Object(ref object) = this {
+    pub fn next(this: &JsValue, _: &[JsValue], context: &mut Context) -> Result<JsValue> {
+        if let JsValue::Object(ref object) = this {
             let mut object = object.borrow_mut();
             if let Some(iterator) = object.as_regexp_string_iterator_mut() {
                 if iterator.completed {
-                    return Ok(create_iter_result_object(context, Value::undefined(), true));
+                    return Ok(create_iter_result_object(
+                        context,
+                        JsValue::undefined(),
+                        true,
+                    ));
                 }
 
                 // TODO: This is the code that should be created as a closure in create_regexp_string_iterator.
@@ -137,7 +141,11 @@ impl RegExpStringIterator {
                 } else {
                     // ii. If match is null, return undefined.
                     iterator.completed = true;
-                    Ok(create_iter_result_object(context, Value::undefined(), true))
+                    Ok(create_iter_result_object(
+                        context,
+                        JsValue::undefined(),
+                        true,
+                    ))
                 }
             } else {
                 context.throw_type_error("`this` is not a RegExpStringIterator")
@@ -153,7 +161,7 @@ impl RegExpStringIterator {
     ///  - [ECMA reference][spec]
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-%arrayiteratorprototype%-object
-    pub(crate) fn create_prototype(context: &mut Context, iterator_prototype: Value) -> GcObject {
+    pub(crate) fn create_prototype(context: &mut Context, iterator_prototype: JsValue) -> GcObject {
         let _timer = BoaProfiler::global().start_event("RegExp String Iterator", "init");
 
         // Create prototype

boa/src/builtins/set/mod.rs

@@ -15,7 +15,7 @@ use crate::{
     object::{ConstructorBuilder, FunctionBuilder, ObjectData, PROTOTYPE},
     property::Attribute,
     symbol::WellKnownSymbols,
-    BoaProfiler, Context, Result, Value,
+    BoaProfiler, Context, JsValue, Result,
 };
 use ordered_set::OrderedSet;
 
@@ -27,7 +27,7 @@ pub mod ordered_set;
 mod tests;
 
 #[derive(Debug, Clone)]
-pub(crate) struct Set(OrderedSet<Value>);
+pub(crate) struct Set(OrderedSet<JsValue>);
 
 impl BuiltIn for Set {
     const NAME: &'static str = "Set";
@@ -36,7 +36,7 @@ impl BuiltIn for Set {
         Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE
     }
 
-    fn init(context: &mut Context) -> (&'static str, Value, Attribute) {
+    fn init(context: &mut Context) -> (&'static str, JsValue, Attribute) {
         let _timer = BoaProfiler::global().start_event(Self::NAME, "init");
 
         let get_species = FunctionBuilder::native(context, Self::get_species)
@@ -110,10 +110,10 @@ impl Set {
 
     /// Create a new set
     pub(crate) fn constructor(
-        new_target: &Value,
-        args: &[Value],
+        new_target: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         // 1
         if new_target.is_undefined() {
             return context
@@ -135,7 +135,7 @@ impl Set {
         let obj = context.construct_object();
         obj.set_prototype_instance(prototype.into());
 
-        let set = Value::from(obj);
+        let set = JsValue::new(obj);
         // 3
         set.set_data(ObjectData::Set(OrderedSet::default()));
 
@@ -186,7 +186,7 @@ impl Set {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-get-set-@@species
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/@@species
-    fn get_species(this: &Value, _: &[Value], _: &mut Context) -> Result<Value> {
+    fn get_species(this: &JsValue, _: &[JsValue], _: &mut Context) -> Result<JsValue> {
         // 1. Return the this value.
         Ok(this.clone())
     }
@@ -201,13 +201,13 @@ impl Set {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-set.prototype.add
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/add
-    pub(crate) fn add(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn add(this: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         let mut value = args.get(0).cloned().unwrap_or_default();
 
         if let Some(object) = this.as_object() {
             if let Some(set) = object.borrow_mut().as_set_mut() {
                 if value.as_number().map(|n| n == -0f64).unwrap_or(false) {
-                    value = Value::Integer(0);
+                    value = JsValue::Integer(0);
                 }
                 set.add(value);
             } else {
@@ -230,11 +230,11 @@ impl Set {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-set.prototype.clear
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/clear
-    pub(crate) fn clear(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn clear(this: &JsValue, _: &[JsValue], context: &mut Context) -> Result<JsValue> {
         if let Some(object) = this.as_object() {
             if object.borrow().is_set() {
                 this.set_data(ObjectData::Set(OrderedSet::new()));
-                Ok(Value::Undefined)
+                Ok(JsValue::undefined())
             } else {
                 context.throw_type_error("'this' is not a Set")
             }
@@ -254,7 +254,11 @@ impl Set {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-set.prototype.delete
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/delete
-    pub(crate) fn delete(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn delete(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         let value = args.get(0).cloned().unwrap_or_default();
 
         let res = if let Some(object) = this.as_object() {
@@ -280,7 +284,7 @@ impl Set {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-set.prototype.entries
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/entries
-    pub(crate) fn entries(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn entries(this: &JsValue, _: &[JsValue], context: &mut Context) -> Result<JsValue> {
         if let Some(object) = this.as_object() {
             let object = object.borrow();
             if !object.is_set() {
@@ -310,16 +314,20 @@ impl Set {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-set.prototype.foreach
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/foreach
-    pub(crate) fn for_each(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn for_each(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         if args.is_empty() {
-            return Err(Value::from("Missing argument for Set.prototype.forEach"));
+            return Err(JsValue::new("Missing argument for Set.prototype.forEach"));
         }
 
         let callback_arg = &args[0];
-        let this_arg = args.get(1).cloned().unwrap_or_else(Value::undefined);
+        let this_arg = args.get(1).cloned().unwrap_or_else(JsValue::undefined);
         // TODO: if condition should also check that we are not in strict mode
         let this_arg = if this_arg.is_undefined() {
-            Value::Object(context.global_object())
+            JsValue::Object(context.global_object())
         } else {
             this_arg
         };
@@ -327,7 +335,7 @@ impl Set {
         let mut index = 0;
 
         while index < Set::get_size(this, context)? {
-            let arguments = if let Value::Object(ref object) = this {
+            let arguments = if let JsValue::Object(ref object) = this {
                 let object = object.borrow();
                 if let Some(set) = object.as_set_ref() {
                     set.get_index(index)
@@ -346,7 +354,7 @@ impl Set {
             index += 1;
         }
 
-        Ok(Value::Undefined)
+        Ok(JsValue::Undefined)
     }
 
     /// `Map.prototype.has( key )`
@@ -359,17 +367,13 @@ impl Set {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-map.prototype.has
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/has
-    pub(crate) fn has(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
-        let undefined = Value::Undefined;
-        let value = match args.len() {
-            0 => &undefined,
-            _ => &args[0],
-        };
+    pub(crate) fn has(this: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
+        let value = args.get(0).cloned().unwrap_or_default();
 
-        if let Value::Object(ref object) = this {
+        if let JsValue::Object(ref object) = this {
             let object = object.borrow();
             if let Some(set) = object.as_set_ref() {
-                return Ok(set.contains(value).into());
+                return Ok(set.contains(&value).into());
             }
         }
 
@@ -386,7 +390,7 @@ impl Set {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-set.prototype.values
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/values
-    pub(crate) fn values(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn values(this: &JsValue, _: &[JsValue], context: &mut Context) -> Result<JsValue> {
         if let Some(object) = this.as_object() {
             let object = object.borrow();
             if !object.is_set() {
@@ -406,13 +410,13 @@ impl Set {
         ))
     }
 
-    fn size_getter(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
-        Set::get_size(this, context).map(Value::from)
+    fn size_getter(this: &JsValue, _: &[JsValue], context: &mut Context) -> Result<JsValue> {
+        Set::get_size(this, context).map(JsValue::from)
     }
 
     /// Helper function to get the size of the set.
-    fn get_size(set: &Value, context: &mut Context) -> Result<usize> {
-        if let Value::Object(ref object) = set {
+    fn get_size(set: &JsValue, context: &mut Context) -> Result<usize> {
+        if let JsValue::Object(ref object) = set {
             let object = object.borrow();
             if let Some(set) = object.as_set_ref() {
                 Ok(set.size())

boa/src/builtins/set/set_iterator.rs

@@ -2,7 +2,7 @@ use crate::{
     builtins::function::make_builtin_fn,
     builtins::iterable::create_iter_result_object,
     builtins::Array,
-    builtins::Value,
+    builtins::JsValue,
     object::{GcObject, ObjectData},
     property::PropertyDescriptor,
     symbol::WellKnownSymbols,
@@ -24,7 +24,7 @@ pub enum SetIterationKind {
 /// [spec]: https://tc39.es/ecma262/#sec-set-iterator-objects
 #[derive(Debug, Clone, Finalize, Trace)]
 pub struct SetIterator {
-    iterated_set: Value,
+    iterated_set: JsValue,
     next_index: usize,
     iteration_kind: SetIterationKind,
 }
@@ -33,7 +33,7 @@ impl SetIterator {
     pub(crate) const NAME: &'static str = "SetIterator";
 
     /// Constructs a new `SetIterator`, that will iterate over `set`, starting at index 0
-    fn new(set: Value, kind: SetIterationKind) -> Self {
+    fn new(set: JsValue, kind: SetIterationKind) -> Self {
         SetIterator {
             iterated_set: set,
             next_index: 0,
@@ -51,10 +51,10 @@ impl SetIterator {
     /// [spec]: https://www.ecma-international.org/ecma-262/11.0/index.html#sec-createsetiterator
     pub(crate) fn create_set_iterator(
         context: &Context,
-        set: Value,
+        set: JsValue,
         kind: SetIterationKind,
-    ) -> Value {
-        let set_iterator = Value::new_object(context);
+    ) -> JsValue {
+        let set_iterator = JsValue::new_object(context);
         set_iterator.set_data(ObjectData::SetIterator(Self::new(set, kind)));
         set_iterator
             .as_object()
@@ -71,8 +71,8 @@ impl SetIterator {
     ///  - [ECMA reference][spec]
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-%setiteratorprototype%.next
-    pub(crate) fn next(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
-        if let Value::Object(ref object) = this {
+    pub(crate) fn next(this: &JsValue, _: &[JsValue], context: &mut Context) -> Result<JsValue> {
+        if let JsValue::Object(ref object) = this {
             let mut object = object.borrow_mut();
             if let Some(set_iterator) = object.as_set_iterator_mut() {
                 let m = &set_iterator.iterated_set;
@@ -80,10 +80,14 @@ impl SetIterator {
                 let item_kind = &set_iterator.iteration_kind;
 
                 if set_iterator.iterated_set.is_undefined() {
-                    return Ok(create_iter_result_object(context, Value::undefined(), true));
+                    return Ok(create_iter_result_object(
+                        context,
+                        JsValue::undefined(),
+                        true,
+                    ));
                 }
 
-                if let Value::Object(ref object) = m {
+                if let JsValue::Object(ref object) = m {
                     if let Some(entries) = object.borrow().as_set_ref() {
                         let num_entries = entries.size();
                         while index < num_entries {
@@ -119,8 +123,12 @@ impl SetIterator {
                     return Err(context.construct_type_error("'this' is not a Set"));
                 }
 
-                set_iterator.iterated_set = Value::undefined();
-                Ok(create_iter_result_object(context, Value::undefined(), true))
+                set_iterator.iterated_set = JsValue::undefined();
+                Ok(create_iter_result_object(
+                    context,
+                    JsValue::undefined(),
+                    true,
+                ))
             } else {
                 context.throw_type_error("`this` is not an SetIterator")
             }
@@ -135,7 +143,7 @@ impl SetIterator {
     ///  - [ECMA reference][spec]
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-%setiteratorprototype%-object
-    pub(crate) fn create_prototype(context: &mut Context, iterator_prototype: Value) -> GcObject {
+    pub(crate) fn create_prototype(context: &mut Context, iterator_prototype: JsValue) -> GcObject {
         let _timer = BoaProfiler::global().start_event(Self::NAME, "init");
 
         // Create prototype

boa/src/builtins/string/mod.rs

@@ -20,7 +20,7 @@ use crate::{
     object::{ConstructorBuilder, ObjectData},
     property::{Attribute, PropertyDescriptor},
     symbol::WellKnownSymbols,
-    BoaProfiler, Context, JsString, Result, Value,
+    BoaProfiler, Context, JsString, JsValue, Result,
 };
 use std::{
     char::{decode_utf16, from_u32},
@@ -90,7 +90,7 @@ impl BuiltIn for String {
         Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE
     }
 
-    fn init(context: &mut Context) -> (&'static str, Value, Attribute) {
+    fn init(context: &mut Context) -> (&'static str, JsValue, Attribute) {
         let _timer = BoaProfiler::global().start_event(Self::NAME, "init");
 
         let symbol_iterator = WellKnownSymbols::iterator();
@@ -155,10 +155,10 @@ impl String {
     ///
     /// <https://tc39.es/ecma262/#sec-string-constructor-string-value>
     pub(crate) fn constructor(
-        new_target: &Value,
-        args: &[Value],
+        new_target: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         // This value is used by console.log and other routines to match Object type
         // to its Javascript Identifier (global constructor method name)
         let string = match args.get(0) {
@@ -184,7 +184,7 @@ impl String {
             })
             .transpose()?
             .unwrap_or_else(|| context.standard_objects().object_object().prototype());
-        let this = Value::new_object(context);
+        let this = JsValue::new_object(context);
 
         this.as_object()
             .expect("this should be an object")
@@ -204,10 +204,10 @@ impl String {
         Ok(this)
     }
 
-    fn this_string_value(this: &Value, context: &mut Context) -> Result<JsString> {
+    fn this_string_value(this: &JsValue, context: &mut Context) -> Result<JsString> {
         match this {
-            Value::String(ref string) => return Ok(string.clone()),
-            Value::Object(ref object) => {
+            JsValue::String(ref string) => return Ok(string.clone()),
+            JsValue::Object(ref object) => {
                 let object = object.borrow();
                 if let Some(string) = object.as_string() {
                     return Ok(string);
@@ -222,9 +222,13 @@ impl String {
     /// Get the string value to a primitive string
     #[allow(clippy::wrong_self_convention)]
     #[inline]
-    pub(crate) fn to_string(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn to_string(
+        this: &JsValue,
+        _: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         // Get String from String Object and send it back as a new value
-        Ok(Value::from(Self::this_string_value(this, context)?))
+        Ok(JsValue::new(Self::this_string_value(this, context)?))
     }
 
     /// `String.prototype.charAt( index )`
@@ -243,14 +247,18 @@ impl String {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-string.prototype.charat
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/charAt
-    pub(crate) fn char_at(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn char_at(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         // First we get it the actual string a private field stored on the object only the context has access to.
         // Then we convert it into a Rust String by wrapping it in from_value
         let primitive_val = this.to_string(context)?;
         let pos = args
             .get(0)
             .cloned()
-            .unwrap_or_else(Value::undefined)
+            .unwrap_or_else(JsValue::undefined)
             .to_integer(context)? as i32;
 
         // Fast path returning empty string when pos is obviously out of range
@@ -263,7 +271,7 @@ impl String {
         // Note that this is an O(N) operation (because UTF-8 is complex) while getting the number of
         // bytes is an O(1) operation.
         if let Some(utf16_val) = primitive_val.encode_utf16().nth(pos as usize) {
-            Ok(Value::from(from_u32(utf16_val as u32).unwrap()))
+            Ok(JsValue::new(from_u32(utf16_val as u32).unwrap()))
         } else {
             Ok("".into())
         }
@@ -280,7 +288,7 @@ impl String {
     ///
     /// [spec]: https://tc39.es/proposal-relative-indexing-method/#sec-string.prototype.at
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/at
-    pub(crate) fn at(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn at(this: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         let this = this.require_object_coercible(context)?;
         let s = this.to_string(context)?;
         let len = s.encode_utf16().count();
@@ -296,11 +304,11 @@ impl String {
         };
 
         if let Some(utf16_val) = s.encode_utf16().nth(k) {
-            Ok(Value::from(
+            Ok(JsValue::new(
                 from_u32(u32::from(utf16_val)).expect("invalid utf-16 character"),
             ))
         } else {
-            Ok(Value::undefined())
+            Ok(JsValue::undefined())
         }
     }
 
@@ -319,28 +327,28 @@ impl String {
     /// [spec]: https://tc39.es/ecma262/#sec-string.prototype.codepointat
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/codePointAt
     pub(crate) fn code_point_at(
-        this: &Value,
-        args: &[Value],
+        this: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         // First we get it the actual string a private field stored on the object only the context has access to.
         // Then we convert it into a Rust String by wrapping it in from_value
         let primitive_val = this.to_string(context)?;
         let pos = args
             .get(0)
             .cloned()
-            .unwrap_or_else(Value::undefined)
+            .unwrap_or_else(JsValue::undefined)
             .to_integer(context)? as i32;
 
         // Fast path returning undefined when pos is obviously out of range
         if pos < 0 || pos >= primitive_val.len() as i32 {
-            return Ok(Value::undefined());
+            return Ok(JsValue::undefined());
         }
 
         if let Some((code_point, _, _)) = code_point_at(primitive_val, pos) {
-            Ok(Value::from(code_point))
+            Ok(JsValue::new(code_point))
         } else {
-            Ok(Value::undefined())
+            Ok(JsValue::undefined())
         }
     }
 
@@ -359,31 +367,31 @@ impl String {
     /// [spec]: https://tc39.es/ecma262/#sec-string.prototype.charcodeat
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/charCodeAt
     pub(crate) fn char_code_at(
-        this: &Value,
-        args: &[Value],
+        this: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         // First we get it the actual string a private field stored on the object only the context has access to.
         // Then we convert it into a Rust String by wrapping it in from_value
         let primitive_val = this.to_string(context)?;
         let pos = args
             .get(0)
             .cloned()
-            .unwrap_or_else(Value::undefined)
+            .unwrap_or_else(JsValue::undefined)
             .to_integer(context)? as i32;
 
         // Fast path returning NaN when pos is obviously out of range
         if pos < 0 || pos >= primitive_val.len() as i32 {
-            return Ok(Value::nan());
+            return Ok(JsValue::nan());
         }
 
         // Calling .len() on a string would give the wrong result, as they are bytes not the number of unicode code points
         // Note that this is an O(N) operation (because UTF-8 is complex) while getting the number of bytes is an O(1) operation.
         // If there is no element at that index, the result is NaN
         if let Some(utf16_val) = primitive_val.encode_utf16().nth(pos as usize) {
-            Ok(Value::from(f64::from(utf16_val)))
+            Ok(JsValue::new(f64::from(utf16_val)))
         } else {
-            Ok(Value::nan())
+            Ok(JsValue::nan())
         }
     }
 
@@ -401,7 +409,11 @@ impl String {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-string.prototype.concat
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/concat
-    pub(crate) fn concat(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn concat(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         let object = this.require_object_coercible(context)?;
         let mut string = object.to_string(context)?.to_string();
 
@@ -409,7 +421,7 @@ impl String {
             string.push_str(&arg.to_string(context)?);
         }
 
-        Ok(Value::from(string))
+        Ok(JsValue::new(string))
     }
 
     /// `String.prototype.repeat( count )`
@@ -423,7 +435,11 @@ impl String {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-string.prototype.repeat
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/repeat
-    pub(crate) fn repeat(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn repeat(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         let object = this.require_object_coercible(context)?;
         let string = object.to_string(context)?;
 
@@ -457,7 +473,11 @@ impl String {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-string.prototype.slice
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/slice
-    pub(crate) fn slice(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn slice(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         // First we get it the actual string a private field stored on the object only the context has access to.
         // Then we convert it into a Rust String by wrapping it in from_value
         let primitive_val = this.to_string(context)?;
@@ -469,12 +489,12 @@ impl String {
         let start = args
             .get(0)
             .cloned()
-            .unwrap_or_else(Value::undefined)
+            .unwrap_or_else(JsValue::undefined)
             .to_integer(context)? as i32;
         let end = args
             .get(1)
             .cloned()
-            .unwrap_or_else(|| Value::integer(length))
+            .unwrap_or_else(|| JsValue::new(length))
             .to_integer(context)? as i32;
 
         let from = if start < 0 {
@@ -495,7 +515,7 @@ impl String {
             .skip(from as usize)
             .take(span as usize)
             .collect();
-        Ok(Value::from(new_str))
+        Ok(JsValue::new(new_str))
     }
 
     /// `String.prototype.startWith( searchString[, position] )`
@@ -509,15 +529,15 @@ impl String {
     /// [spec]: https://tc39.es/ecma262/#sec-string.prototype.startswith
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/startsWith
     pub(crate) fn starts_with(
-        this: &Value,
-        args: &[Value],
+        this: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         // First we get it the actual string a private field stored on the object only the context has access to.
         // Then we convert it into a Rust String by wrapping it in from_value
         let primitive_val = this.to_string(context)?;
 
-        let arg = args.get(0).cloned().unwrap_or_else(Value::undefined);
+        let arg = args.get(0).cloned().unwrap_or_else(JsValue::undefined);
 
         if Self::is_regexp_object(&arg) {
             context.throw_type_error(
@@ -543,11 +563,13 @@ impl String {
         let end = start.wrapping_add(search_length);
 
         if end > length {
-            Ok(Value::from(false))
+            Ok(JsValue::new(false))
         } else {
             // Only use the part of the string from "start"
             let this_string: StdString = primitive_val.chars().skip(start as usize).collect();
-            Ok(Value::from(this_string.starts_with(search_string.as_str())))
+            Ok(JsValue::new(
+                this_string.starts_with(search_string.as_str()),
+            ))
         }
     }
 
@@ -561,12 +583,16 @@ impl String {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-string.prototype.endswith
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/endsWith
-    pub(crate) fn ends_with(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn ends_with(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         // First we get it the actual string a private field stored on the object only the context has access to.
         // Then we convert it into a Rust String by wrapping it in from_value
         let primitive_val = this.to_string(context)?;
 
-        let arg = args.get(0).cloned().unwrap_or_else(Value::undefined);
+        let arg = args.get(0).cloned().unwrap_or_else(JsValue::undefined);
 
         if Self::is_regexp_object(&arg) {
             context.throw_type_error(
@@ -593,11 +619,11 @@ impl String {
         let start = end.wrapping_sub(search_length);
 
         if start < 0 {
-            Ok(Value::from(false))
+            Ok(JsValue::new(false))
         } else {
             // Only use the part of the string up to "end"
             let this_string: StdString = primitive_val.chars().take(end as usize).collect();
-            Ok(Value::from(this_string.ends_with(search_string.as_str())))
+            Ok(JsValue::new(this_string.ends_with(search_string.as_str())))
         }
     }
 
@@ -611,12 +637,16 @@ impl String {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-string.prototype.includes
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/includes
-    pub(crate) fn includes(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn includes(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         // First we get it the actual string a private field stored on the object only the context has access to.
         // Then we convert it into a Rust String by wrapping it in from_value
         let primitive_val = this.to_string(context)?;
 
-        let arg = args.get(0).cloned().unwrap_or_else(Value::undefined);
+        let arg = args.get(0).cloned().unwrap_or_else(JsValue::undefined);
 
         if Self::is_regexp_object(&arg) {
             context.throw_type_error(
@@ -642,12 +672,12 @@ impl String {
         // Take the string from "this" and use only the part of it after "start"
         let this_string: StdString = primitive_val.chars().skip(start as usize).collect();
 
-        Ok(Value::from(this_string.contains(search_string.as_str())))
+        Ok(JsValue::new(this_string.contains(search_string.as_str())))
     }
 
-    fn is_regexp_object(value: &Value) -> bool {
+    fn is_regexp_object(value: &JsValue) -> bool {
         match value {
-            Value::Object(ref obj) => obj.borrow().is_regexp(),
+            JsValue::Object(ref obj) => obj.borrow().is_regexp(),
             _ => false,
         }
     }
@@ -667,7 +697,11 @@ impl String {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-string.prototype.replace
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/replace
-    pub(crate) fn replace(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn replace(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         // 1. Let O be ? RequireObjectCoercible(this value).
         this.require_object_coercible(context)?;
 
@@ -727,7 +761,7 @@ impl String {
             context
                 .call(
                     &replace_value,
-                    &Value::Undefined,
+                    &JsValue::undefined(),
                     &[
                         search_str.into(),
                         position.unwrap().into(),
@@ -746,7 +780,7 @@ impl String {
                 this_str.to_string(),
                 position.unwrap(),
                 captures,
-                Value::undefined(),
+                JsValue::undefined(),
                 replace_value.to_string(context)?,
                 context,
             )?
@@ -777,14 +811,18 @@ impl String {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-string.prototype.indexof
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/indexOf
-    pub(crate) fn index_of(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn index_of(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         let this = this.require_object_coercible(context)?;
         let string = this.to_string(context)?;
 
         let search_string = args
             .get(0)
             .cloned()
-            .unwrap_or_else(Value::undefined)
+            .unwrap_or_else(JsValue::undefined)
             .to_string(context)?;
 
         let length = string.chars().count();
@@ -804,7 +842,7 @@ impl String {
             }
         }
 
-        Ok(Value::from(-1))
+        Ok(JsValue::new(-1))
     }
 
     /// `String.prototype.lastIndexOf( searchValue[, fromIndex] )`
@@ -821,17 +859,17 @@ impl String {
     /// [spec]: https://tc39.es/ecma262/#sec-string.prototype.lastindexof
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/lastIndexOf
     pub(crate) fn last_index_of(
-        this: &Value,
-        args: &[Value],
+        this: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         let this = this.require_object_coercible(context)?;
         let string = this.to_string(context)?;
 
         let search_string = args
             .get(0)
             .cloned()
-            .unwrap_or_else(Value::undefined)
+            .unwrap_or_else(JsValue::undefined)
             .to_string(context)?;
 
         let length = string.chars().count();
@@ -851,7 +889,7 @@ impl String {
             }
         }
 
-        Ok(Value::from(-1))
+        Ok(JsValue::new(-1))
     }
 
     /// `String.prototype.match( regexp )`
@@ -865,7 +903,11 @@ impl String {
     /// [spec]: https://tc39.es/ecma262/#sec-string.prototype.match
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/match
     /// [regex]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions
-    pub(crate) fn r#match(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn r#match(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         // 1. Let O be ? RequireObjectCoercible(this value).
         let o = this.require_object_coercible(context)?;
 
@@ -886,12 +928,12 @@ impl String {
         let s = o.to_string(context)?;
 
         // 4. Let rx be ? RegExpCreate(regexp, undefined).
-        let rx = RegExp::create(regexp, Value::undefined(), context)?;
+        let rx = RegExp::create(regexp, JsValue::undefined(), context)?;
 
         // 5. Return ? Invoke(rx, @@match, « S »).
         let obj = rx.as_object().expect("RegExpCreate must return Object");
         if let Some(matcher) = obj.get_method(context, WellKnownSymbols::match_())? {
-            matcher.call(&rx, &[Value::from(s)], context)
+            matcher.call(&rx, &[JsValue::new(s)], context)
         } else {
             context.throw_type_error("RegExp[Symbol.match] is undefined")
         }
@@ -906,17 +948,17 @@ impl String {
         max_length: i32,
         fill_string: Option<JsString>,
         at_start: bool,
-    ) -> Value {
+    ) -> JsValue {
         let primitive_length = primitive.len() as i32;
 
         if max_length <= primitive_length {
-            return Value::from(primitive);
+            return JsValue::new(primitive);
         }
 
         let filler = fill_string.as_deref().unwrap_or(" ");
 
         if filler.is_empty() {
-            return Value::from(primitive);
+            return JsValue::new(primitive);
         }
 
         let fill_len = max_length.wrapping_sub(primitive_length);
@@ -929,9 +971,9 @@ impl String {
         let concat_fill_str: StdString = fill_str.chars().take(fill_len as usize).collect();
 
         if at_start {
-            Value::from(format!("{}{}", concat_fill_str, &primitive))
+            JsValue::new(format!("{}{}", concat_fill_str, &primitive))
         } else {
-            Value::from(format!("{}{}", primitive, &concat_fill_str))
+            JsValue::new(format!("{}{}", primitive, &concat_fill_str))
         }
     }
 
@@ -947,10 +989,14 @@ impl String {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-string.prototype.padend
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/padEnd
-    pub(crate) fn pad_end(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn pad_end(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         let primitive = this.to_string(context)?;
         if args.is_empty() {
-            return Err(Value::from("padEnd requires maxLength argument"));
+            return Err(JsValue::new("padEnd requires maxLength argument"));
         }
         let max_length = args
             .get(0)
@@ -974,10 +1020,14 @@ impl String {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-string.prototype.padstart
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/padStart
-    pub(crate) fn pad_start(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn pad_start(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         let primitive = this.to_string(context)?;
         if args.is_empty() {
-            return Err(Value::from("padStart requires maxLength argument"));
+            return Err(JsValue::new("padStart requires maxLength argument"));
         }
         let max_length = args
             .get(0)
@@ -1001,10 +1051,10 @@ impl String {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-string.prototype.trim
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/trim
-    pub(crate) fn trim(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn trim(this: &JsValue, _: &[JsValue], context: &mut Context) -> Result<JsValue> {
         let this = this.require_object_coercible(context)?;
         let string = this.to_string(context)?;
-        Ok(Value::from(string.trim_matches(is_trimmable_whitespace)))
+        Ok(JsValue::new(string.trim_matches(is_trimmable_whitespace)))
     }
 
     /// `String.prototype.trimStart()`
@@ -1019,9 +1069,13 @@ impl String {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-string.prototype.trimstart
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/trimStart
-    pub(crate) fn trim_start(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn trim_start(
+        this: &JsValue,
+        _: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         let string = this.to_string(context)?;
-        Ok(Value::from(
+        Ok(JsValue::new(
             string.trim_start_matches(is_trimmable_whitespace),
         ))
     }
@@ -1038,10 +1092,14 @@ impl String {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-string.prototype.trimend
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/trimEnd
-    pub(crate) fn trim_end(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn trim_end(
+        this: &JsValue,
+        _: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         let this = this.require_object_coercible(context)?;
         let string = this.to_string(context)?;
-        Ok(Value::from(
+        Ok(JsValue::new(
             string.trim_end_matches(is_trimmable_whitespace),
         ))
     }
@@ -1057,13 +1115,17 @@ impl String {
     /// [spec]: https://tc39.es/ecma262/#sec-string.prototype.tolowercase
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/toLowerCase
     #[allow(clippy::wrong_self_convention)]
-    pub(crate) fn to_lowercase(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn to_lowercase(
+        this: &JsValue,
+        _: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         // First we get it the actual string a private field stored on the object only the context has access to.
         // Then we convert it into a Rust String by wrapping it in from_value
         let this_str = this.to_string(context)?;
         // The Rust String is mapped to uppercase using the builtin .to_lowercase().
         // There might be corner cases where it does not behave exactly like Javascript expects
-        Ok(Value::from(this_str.to_lowercase()))
+        Ok(JsValue::new(this_str.to_lowercase()))
     }
 
     /// `String.prototype.toUpperCase()`
@@ -1079,13 +1141,17 @@ impl String {
     /// [spec]: https://tc39.es/ecma262/#sec-string.prototype.toUppercase
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/toUpperCase
     #[allow(clippy::wrong_self_convention)]
-    pub(crate) fn to_uppercase(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn to_uppercase(
+        this: &JsValue,
+        _: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         // First we get it the actual string a private field stored on the object only the context has access to.
         // Then we convert it into a Rust String by wrapping it in from_value
         let this_str = this.to_string(context)?;
         // The Rust String is mapped to uppercase using the builtin .to_uppercase().
         // There might be corner cases where it does not behave exactly like Javascript expects
-        Ok(Value::from(this_str.to_uppercase()))
+        Ok(JsValue::new(this_str.to_uppercase()))
     }
 
     /// `String.prototype.substring( indexStart[, indexEnd] )`
@@ -1098,7 +1164,11 @@ impl String {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-string.prototype.substring
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/substring
-    pub(crate) fn substring(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn substring(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         // First we get it the actual string a private field stored on the object only the context has access to.
         // Then we convert it into a Rust String by wrapping it in from_value
         let primitive_val = this.to_string(context)?;
@@ -1135,7 +1205,7 @@ impl String {
                 .take(to.wrapping_sub(from)),
         )
         .collect();
-        Ok(Value::from(extracted_string.expect("Invalid string")))
+        Ok(JsValue::new(extracted_string.expect("Invalid string")))
     }
 
     /// `String.prototype.substr( start[, length] )`
@@ -1149,7 +1219,11 @@ impl String {
     /// [spec]: https://tc39.es/ecma262/#sec-string.prototype.substr
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/substr
     /// <https://tc39.es/ecma262/#sec-string.prototype.substr>
-    pub(crate) fn substr(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn substr(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         // First we get it the actual string a private field stored on the object only the context has access to.
         // Then we convert it into a Rust String by wrapping it in from_value
         let primitive_val = this.to_string(context)?;
@@ -1183,7 +1257,7 @@ impl String {
         // If length is negative we return an empty string
         // otherwise we extract the part of the string from start and is length code units long
         if result_length <= 0 {
-            Ok(Value::from(""))
+            Ok(JsValue::new(""))
         } else {
             let extracted_string: StdString = primitive_val
                 .chars()
@@ -1191,7 +1265,7 @@ impl String {
                 .take(result_length as usize)
                 .collect();
 
-            Ok(Value::from(extracted_string))
+            Ok(JsValue::new(extracted_string))
         }
     }
 
@@ -1206,7 +1280,11 @@ impl String {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-string.prototype.split
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/split
-    pub(crate) fn split(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn split(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         // 1. Let O be ? RequireObjectCoercible(this value).
         let this = this.require_object_coercible(context)?;
 
@@ -1356,7 +1434,11 @@ impl String {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-string.prototype.value_of
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/valueOf
-    pub(crate) fn value_of(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn value_of(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         // Use the to_string method because it is specified to do the same thing in this case
         Self::to_string(this, args, context)
     }
@@ -1373,7 +1455,11 @@ impl String {
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/matchAll
     /// [regex]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions
     /// [cg]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions/Groups_and_Ranges
-    pub(crate) fn match_all(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn match_all(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         // 1. Let O be ? RequireObjectCoercible(this value).
         let o = this.require_object_coercible(context)?;
 
@@ -1411,12 +1497,12 @@ impl String {
         let s = o.to_string(context)?;
 
         // 4. Let rx be ? RegExpCreate(regexp, "g").
-        let rx = RegExp::create(regexp, Value::from("g"), context)?;
+        let rx = RegExp::create(regexp, JsValue::new("g"), context)?;
 
         // 5. Return ? Invoke(rx, @@matchAll, « S »).
         let obj = rx.as_object().expect("RegExpCreate must return Object");
         if let Some(matcher) = obj.get_method(context, WellKnownSymbols::match_all())? {
-            matcher.call(&rx, &[Value::from(s)], context)
+            matcher.call(&rx, &[JsValue::new(s)], context)
         } else {
             context.throw_type_error("RegExp[Symbol.matchAll] is undefined")
         }
@@ -1432,7 +1518,11 @@ impl String {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-string.prototype.normalize
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/normalize
-    pub(crate) fn normalize(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn normalize(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         let this = this.require_object_coercible(context)?;
         let s = this.to_string(context)?;
         let form = args.get(0).cloned().unwrap_or_default();
@@ -1447,10 +1537,10 @@ impl String {
         };
 
         match f {
-            "NFC" => Ok(Value::from(s.nfc().collect::<StdString>())),
-            "NFD" => Ok(Value::from(s.nfd().collect::<StdString>())),
-            "NFKC" => Ok(Value::from(s.nfkc().collect::<StdString>())),
-            "NFKD" => Ok(Value::from(s.nfkd().collect::<StdString>())),
+            "NFC" => Ok(JsValue::new(s.nfc().collect::<StdString>())),
+            "NFD" => Ok(JsValue::new(s.nfd().collect::<StdString>())),
+            "NFKC" => Ok(JsValue::new(s.nfkc().collect::<StdString>())),
+            "NFKD" => Ok(JsValue::new(s.nfkd().collect::<StdString>())),
             _ => context
                 .throw_range_error("The normalization form should be one of NFC, NFD, NFKC, NFKD."),
         }
@@ -1466,7 +1556,11 @@ impl String {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-string.prototype.search
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/search
-    pub(crate) fn search(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn search(
+        this: &JsValue,
+        args: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         // 1. Let O be ? RequireObjectCoercible(this value).
         let o = this.require_object_coercible(context)?;
 
@@ -1487,18 +1581,22 @@ impl String {
         let string = o.to_string(context)?;
 
         // 4. Let rx be ? RegExpCreate(regexp, undefined).
-        let rx = RegExp::create(regexp, Value::undefined(), context)?;
+        let rx = RegExp::create(regexp, JsValue::undefined(), context)?;
 
         // 5. Return ? Invoke(rx, @@search, « string »).
         let obj = rx.as_object().expect("RegExpCreate must return Object");
         if let Some(matcher) = obj.get_method(context, WellKnownSymbols::search())? {
-            matcher.call(&rx, &[Value::from(string)], context)
+            matcher.call(&rx, &[JsValue::new(string)], context)
         } else {
             context.throw_type_error("RegExp[Symbol.search] is undefined")
         }
     }
 
-    pub(crate) fn iterator(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn iterator(
+        this: &JsValue,
+        _: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         StringIterator::create_string_iterator(context, this.clone())
     }
 }
@@ -1513,8 +1611,8 @@ pub(crate) fn get_substitution(
     matched: StdString,
     str: StdString,
     position: usize,
-    captures: Vec<Value>,
-    named_captures: Value,
+    captures: Vec<JsValue>,
+    named_captures: JsValue,
     replacement: JsString,
     context: &mut Context,
 ) -> Result<JsString> {

boa/src/builtins/string/string_iterator.rs

@@ -6,25 +6,25 @@ use crate::{
     object::{GcObject, ObjectData},
     property::PropertyDescriptor,
     symbol::WellKnownSymbols,
-    BoaProfiler, Context, Result, Value,
+    BoaProfiler, Context, JsValue, Result,
 };
 
 #[derive(Debug, Clone, Finalize, Trace)]
 pub struct StringIterator {
-    string: Value,
+    string: JsValue,
     next_index: i32,
 }
 
 impl StringIterator {
-    fn new(string: Value) -> Self {
+    fn new(string: JsValue) -> Self {
         Self {
             string,
             next_index: 0,
         }
     }
 
-    pub fn create_string_iterator(context: &mut Context, string: Value) -> Result<Value> {
-        let string_iterator = Value::new_object(context);
+    pub fn create_string_iterator(context: &mut Context, string: JsValue) -> Result<JsValue> {
+        let string_iterator = JsValue::new_object(context);
         string_iterator.set_data(ObjectData::StringIterator(Self::new(string)));
         string_iterator
             .as_object()
@@ -33,19 +33,27 @@ impl StringIterator {
         Ok(string_iterator)
     }
 
-    pub fn next(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
-        if let Value::Object(ref object) = this {
+    pub fn next(this: &JsValue, _: &[JsValue], context: &mut Context) -> Result<JsValue> {
+        if let JsValue::Object(ref object) = this {
             let mut object = object.borrow_mut();
             if let Some(string_iterator) = object.as_string_iterator_mut() {
                 if string_iterator.string.is_undefined() {
-                    return Ok(create_iter_result_object(context, Value::undefined(), true));
+                    return Ok(create_iter_result_object(
+                        context,
+                        JsValue::undefined(),
+                        true,
+                    ));
                 }
                 let native_string = string_iterator.string.to_string(context)?;
                 let len = native_string.encode_utf16().count() as i32;
                 let position = string_iterator.next_index;
                 if position >= len {
-                    string_iterator.string = Value::undefined();
-                    return Ok(create_iter_result_object(context, Value::undefined(), true));
+                    string_iterator.string = JsValue::undefined();
+                    return Ok(create_iter_result_object(
+                        context,
+                        JsValue::undefined(),
+                        true,
+                    ));
                 }
                 let (_, code_unit_count, _) =
                     code_point_at(native_string, position).expect("Invalid code point position");
@@ -70,7 +78,7 @@ impl StringIterator {
     ///  - [ECMA reference][spec]
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-%arrayiteratorprototype%-object
-    pub(crate) fn create_prototype(context: &mut Context, iterator_prototype: Value) -> GcObject {
+    pub(crate) fn create_prototype(context: &mut Context, iterator_prototype: JsValue) -> GcObject {
         let _timer = BoaProfiler::global().start_event("String Iterator", "init");
 
         // Create prototype

boa/src/builtins/symbol/mod.rs

@@ -23,7 +23,7 @@ use crate::{
     object::{ConstructorBuilder, FunctionBuilder},
     property::Attribute,
     symbol::{JsSymbol, WellKnownSymbols},
-    value::Value,
+    value::JsValue,
     BoaProfiler, Context, JsString, Result,
 };
 
@@ -78,7 +78,7 @@ impl BuiltIn for Symbol {
         Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE
     }
 
-    fn init(context: &mut Context) -> (&'static str, Value, Attribute) {
+    fn init(context: &mut Context) -> (&'static str, JsValue, Attribute) {
         let _timer = BoaProfiler::global().start_event(Self::NAME, "init");
 
         let symbol_async_iterator = WellKnownSymbols::async_iterator();
@@ -160,10 +160,10 @@ impl Symbol {
     /// [spec]: https://tc39.es/ecma262/#sec-symbol-description
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/Symbol
     pub(crate) fn constructor(
-        new_target: &Value,
-        args: &[Value],
+        new_target: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         if new_target.is_undefined() {
             return context.throw_type_error("Symbol is not a constructor");
         }
@@ -175,10 +175,10 @@ impl Symbol {
         Ok(JsSymbol::new(description).into())
     }
 
-    fn this_symbol_value(value: &Value, context: &mut Context) -> Result<JsSymbol> {
+    fn this_symbol_value(value: &JsValue, context: &mut Context) -> Result<JsSymbol> {
         match value {
-            Value::Symbol(ref symbol) => return Ok(symbol.clone()),
-            Value::Object(ref object) => {
+            JsValue::Symbol(ref symbol) => return Ok(symbol.clone()),
+            JsValue::Object(ref object) => {
                 let object = object.borrow();
                 if let Some(symbol) = object.as_symbol() {
                     return Ok(symbol);
@@ -201,7 +201,11 @@ impl Symbol {
     /// [spec]: https://tc39.es/ecma262/#sec-symbol.prototype.tostring
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/toString
     #[allow(clippy::wrong_self_convention)]
-    pub(crate) fn to_string(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn to_string(
+        this: &JsValue,
+        _: &[JsValue],
+        context: &mut Context,
+    ) -> Result<JsValue> {
         let symbol = Self::this_symbol_value(this, context)?;
         Ok(symbol.to_string().into())
     }
@@ -217,15 +221,15 @@ impl Symbol {
     /// [spec]: https://tc39.es/ecma262/#sec-symbol.prototype.description
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/description
     pub(crate) fn get_description(
-        this: &Value,
-        _: &[Value],
+        this: &JsValue,
+        _: &[JsValue],
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         let symbol = Self::this_symbol_value(this, context)?;
         if let Some(ref description) = symbol.description() {
             Ok(description.clone().into())
         } else {
-            Ok(Value::undefined())
+            Ok(JsValue::undefined())
         }
     }
 
@@ -237,7 +241,7 @@ impl Symbol {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-symbol.prototype.for
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/for
-    pub(crate) fn for_(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn for_(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         // 1. Let stringKey be ? ToString(key).
         let string_key = args
             .get(0)
@@ -267,7 +271,7 @@ impl Symbol {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-symbol.prototype.keyfor
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/keyFor
-    pub(crate) fn key_for(_: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub(crate) fn key_for(_: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         let sym = args.get(0).cloned().unwrap_or_default();
         // 1. If Type(sym) is not Symbol, throw a TypeError exception.
         if let Some(sym) = sym.as_symbol() {
@@ -280,7 +284,7 @@ impl Symbol {
                 registry.get_symbol(sym)
             });
 
-            Ok(symbol.map(Value::from).unwrap_or_default())
+            Ok(symbol.map(JsValue::from).unwrap_or_default())
         } else {
             context.throw_type_error("Symbol.keyFor: sym is not a symbol")
         }

boa/src/builtins/undefined/mod.rs

@@ -9,7 +9,7 @@
 //! [spec]: https://tc39.es/ecma262/#sec-undefined
 //! [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/undefined
 
-use crate::{builtins::BuiltIn, property::Attribute, BoaProfiler, Context, Value};
+use crate::{builtins::BuiltIn, property::Attribute, BoaProfiler, Context, JsValue};
 
 #[cfg(test)]
 mod tests;
@@ -25,9 +25,9 @@ impl BuiltIn for Undefined {
         Attribute::READONLY | Attribute::NON_ENUMERABLE | Attribute::PERMANENT
     }
 
-    fn init(_: &mut Context) -> (&'static str, Value, Attribute) {
+    fn init(_: &mut Context) -> (&'static str, JsValue, Attribute) {
         let _timer = BoaProfiler::global().start_event(Self::NAME, "init");
 
-        (Self::NAME, Value::undefined(), Self::attribute())
+        (Self::NAME, JsValue::undefined(), Self::attribute())
     }
 }

boa/src/bytecompiler.rs

@@ -5,7 +5,7 @@ use crate::{
         Const, Node,
     },
     vm::{CodeBlock, Opcode},
-    JsBigInt, JsString, Value,
+    JsBigInt, JsString, JsValue,
 };
 use std::collections::HashMap;
 
@@ -72,8 +72,8 @@ impl ByteCompiler {
         }
 
         let value = match liternal.clone() {
-            Literal::String(value) => Value::from(value),
-            Literal::BigInt(value) => Value::from(value),
+            Literal::String(value) => JsValue::new(value),
+            Literal::BigInt(value) => JsValue::new(value),
         };
 
         let index = self.code_block.literals.len() as u32;

boa/src/class.rs

@@ -6,7 +6,7 @@
 //!#    property::Attribute,
 //!#    class::{Class, ClassBuilder},
 //!#    gc::{Finalize, Trace},
-//!#    Context, Result, Value,
+//!#    Context, Result, JsValue,
 //!# };
 //!#
 //! // This does not have to be an enum it can also be a struct.
@@ -25,7 +25,7 @@
 //!     const LENGTH: usize = 1;
 //!
 //!     // This is what is called when we do `new Animal()`
-//!     fn constructor(_this: &Value, args: &[Value], context: &mut Context) -> Result<Self> {
+//!     fn constructor(_this: &JsValue, args: &[JsValue], context: &mut Context) -> Result<Self> {
 //!         // This is equivalent to `String(arg)`.
 //!         let kind = args.get(0).cloned().unwrap_or_default().to_string(context)?;
 //!
@@ -50,7 +50,7 @@
 //!                     }
 //!                 }
 //!             }
-//!             Ok(Value::undefined())
+//!             Ok(JsValue::undefined())
 //!         });
 //!
 //!         Ok(())
@@ -64,7 +64,7 @@ use crate::{
     builtins::function::NativeFunction,
     object::{ConstructorBuilder, GcObject, NativeObject, ObjectData},
     property::{Attribute, PropertyDescriptor, PropertyKey},
-    Context, Result, Value,
+    Context, JsValue, Result,
 };
 
 /// Native class.
@@ -77,7 +77,7 @@ pub trait Class: NativeObject + Sized {
     const ATTRIBUTES: Attribute = Attribute::all();
 
     /// The constructor of the class.
-    fn constructor(this: &Value, args: &[Value], context: &mut Context) -> Result<Self>;
+    fn constructor(this: &JsValue, args: &[JsValue], context: &mut Context) -> Result<Self>;
 
     /// Initializes the internals and the methods of the class.
     fn init(class: &mut ClassBuilder<'_>) -> Result<()>;
@@ -88,13 +88,13 @@ pub trait Class: NativeObject + Sized {
 /// This is automatically implemented, when a type implements `Class`.
 pub trait ClassConstructor: Class {
     /// The raw constructor that mathces the `NativeFunction` signature.
-    fn raw_constructor(this: &Value, args: &[Value], context: &mut Context) -> Result<Value>
+    fn raw_constructor(this: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue>
     where
         Self: Sized;
 }
 
 impl<T: Class> ClassConstructor for T {
-    fn raw_constructor(this: &Value, args: &[Value], context: &mut Context) -> Result<Value>
+    fn raw_constructor(this: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue>
     where
         Self: Sized,
     {
@@ -163,7 +163,7 @@ impl<'context> ClassBuilder<'context> {
     pub fn property<K, V>(&mut self, key: K, value: V, attribute: Attribute) -> &mut Self
     where
         K: Into<PropertyKey>,
-        V: Into<Value>,
+        V: Into<JsValue>,
     {
         self.builder.property(key, value, attribute);
         self
@@ -176,7 +176,7 @@ impl<'context> ClassBuilder<'context> {
     pub fn static_property<K, V>(&mut self, key: K, value: V, attribute: Attribute) -> &mut Self
     where
         K: Into<PropertyKey>,
-        V: Into<Value>,
+        V: Into<JsValue>,
     {
         self.builder.static_property(key, value, attribute);
         self

boa/src/context.rs

@@ -21,7 +21,7 @@ use crate::{
         },
         Parser,
     },
-    BoaProfiler, Executable, JsString, Result, Value,
+    BoaProfiler, Executable, JsString, JsValue, Result,
 };
 
 #[cfg(feature = "console")]
@@ -334,15 +334,20 @@ impl Context {
     /// Construct an empty object.
     #[inline]
     pub fn construct_object(&self) -> GcObject {
-        let object_prototype: Value = self.standard_objects().object_object().prototype().into();
+        let object_prototype: JsValue = self.standard_objects().object_object().prototype().into();
         GcObject::new(Object::create(object_prototype))
     }
 
     /// <https://tc39.es/ecma262/#sec-call>
     #[inline]
-    pub(crate) fn call(&mut self, f: &Value, this: &Value, args: &[Value]) -> Result<Value> {
+    pub(crate) fn call(
+        &mut self,
+        f: &JsValue,
+        this: &JsValue,
+        args: &[JsValue],
+    ) -> Result<JsValue> {
         match *f {
-            Value::Object(ref object) => object.call(this, args, self),
+            JsValue::Object(ref object) => object.call(this, args, self),
             _ => self.throw_type_error("not a function"),
         }
     }
@@ -355,7 +360,7 @@ impl Context {
 
     /// Constructs a `RangeError` with the specified message.
     #[inline]
-    pub fn construct_range_error<M>(&mut self, message: M) -> Value
+    pub fn construct_range_error<M>(&mut self, message: M) -> JsValue
     where
         M: Into<Box<str>>,
     {
@@ -370,7 +375,7 @@ impl Context {
 
     /// Throws a `RangeError` with the specified message.
     #[inline]
-    pub fn throw_range_error<M>(&mut self, message: M) -> Result<Value>
+    pub fn throw_range_error<M>(&mut self, message: M) -> Result<JsValue>
     where
         M: Into<Box<str>>,
     {
@@ -379,7 +384,7 @@ impl Context {
 
     /// Constructs a `TypeError` with the specified message.
     #[inline]
-    pub fn construct_type_error<M>(&mut self, message: M) -> Value
+    pub fn construct_type_error<M>(&mut self, message: M) -> JsValue
     where
         M: Into<Box<str>>,
     {
@@ -394,7 +399,7 @@ impl Context {
 
     /// Throws a `TypeError` with the specified message.
     #[inline]
-    pub fn throw_type_error<M>(&mut self, message: M) -> Result<Value>
+    pub fn throw_type_error<M>(&mut self, message: M) -> Result<JsValue>
     where
         M: Into<Box<str>>,
     {
@@ -403,7 +408,7 @@ impl Context {
 
     /// Constructs a `ReferenceError` with the specified message.
     #[inline]
-    pub fn construct_reference_error<M>(&mut self, message: M) -> Value
+    pub fn construct_reference_error<M>(&mut self, message: M) -> JsValue
     where
         M: Into<Box<str>>,
     {
@@ -417,7 +422,7 @@ impl Context {
 
     /// Throws a `ReferenceError` with the specified message.
     #[inline]
-    pub fn throw_reference_error<M>(&mut self, message: M) -> Result<Value>
+    pub fn throw_reference_error<M>(&mut self, message: M) -> Result<JsValue>
     where
         M: Into<Box<str>>,
     {
@@ -426,7 +431,7 @@ impl Context {
 
     /// Constructs a `SyntaxError` with the specified message.
     #[inline]
-    pub fn construct_syntax_error<M>(&mut self, message: M) -> Value
+    pub fn construct_syntax_error<M>(&mut self, message: M) -> JsValue
     where
         M: Into<Box<str>>,
     {
@@ -440,7 +445,7 @@ impl Context {
 
     /// Throws a `SyntaxError` with the specified message.
     #[inline]
-    pub fn throw_syntax_error<M>(&mut self, message: M) -> Result<Value>
+    pub fn throw_syntax_error<M>(&mut self, message: M) -> Result<JsValue>
     where
         M: Into<Box<str>>,
     {
@@ -448,7 +453,7 @@ impl Context {
     }
 
     /// Constructs a `EvalError` with the specified message.
-    pub fn construct_eval_error<M>(&mut self, message: M) -> Value
+    pub fn construct_eval_error<M>(&mut self, message: M) -> JsValue
     where
         M: Into<Box<str>>,
     {
@@ -461,7 +466,7 @@ impl Context {
     }
 
     /// Constructs a `URIError` with the specified message.
-    pub fn construct_uri_error<M>(&mut self, message: M) -> Value
+    pub fn construct_uri_error<M>(&mut self, message: M) -> JsValue
     where
         M: Into<Box<str>>,
     {
@@ -474,7 +479,7 @@ impl Context {
     }
 
     /// Throws a `EvalError` with the specified message.
-    pub fn throw_eval_error<M>(&mut self, message: M) -> Result<Value>
+    pub fn throw_eval_error<M>(&mut self, message: M) -> Result<JsValue>
     where
         M: Into<Box<str>>,
     {
@@ -482,7 +487,7 @@ impl Context {
     }
 
     /// Throws a `URIError` with the specified message.
-    pub fn throw_uri_error<M>(&mut self, message: M) -> Result<Value>
+    pub fn throw_uri_error<M>(&mut self, message: M) -> Result<JsValue>
     where
         M: Into<Box<str>>,
     {
@@ -496,14 +501,14 @@ impl Context {
         params: P,
         body: B,
         flags: FunctionFlags,
-    ) -> Result<Value>
+    ) -> Result<JsValue>
     where
         N: Into<JsString>,
         P: Into<Box<[FormalParameter]>>,
         B: Into<StatementList>,
     {
         let name = name.into();
-        let function_prototype: Value =
+        let function_prototype: JsValue =
             self.standard_objects().function_object().prototype().into();
 
         // Every new function has a prototype property pre-made
@@ -606,7 +611,7 @@ impl Context {
     #[inline]
     pub fn register_global_closure<F>(&mut self, name: &str, length: usize, body: F) -> Result<()>
     where
-        F: Fn(&Value, &[Value], &mut Context) -> Result<Value> + 'static,
+        F: Fn(&JsValue, &[JsValue], &mut Context) -> Result<JsValue> + 'static,
     {
         let function = FunctionBuilder::closure(self, body)
             .name(name)
@@ -627,7 +632,7 @@ impl Context {
 
     /// <https://tc39.es/ecma262/#sec-hasproperty>
     #[inline]
-    pub(crate) fn has_property(&self, obj: &Value, key: &PropertyKey) -> bool {
+    pub(crate) fn has_property(&self, obj: &JsValue, key: &PropertyKey) -> bool {
         if let Some(obj) = obj.as_object() {
             obj.__has_property__(key)
         } else {
@@ -636,7 +641,7 @@ impl Context {
     }
 
     #[inline]
-    pub(crate) fn set_value(&mut self, node: &Node, value: Value) -> Result<Value> {
+    pub(crate) fn set_value(&mut self, node: &Node, value: JsValue) -> Result<JsValue> {
         match node {
             Node::Identifier(ref name) => {
                 self.set_mutable_binding(name.as_ref(), value.clone(), true)?;
@@ -725,7 +730,7 @@ impl Context {
     pub fn register_global_property<K, V>(&mut self, key: K, value: V, attribute: Attribute)
     where
         K: Into<PropertyKey>,
-        V: Into<Value>,
+        V: Into<JsValue>,
     {
         self.global_object().insert(
             key,
@@ -752,7 +757,7 @@ impl Context {
     #[cfg(not(feature = "vm"))]
     #[allow(clippy::unit_arg, clippy::drop_copy)]
     #[inline]
-    pub fn eval<T: AsRef<[u8]>>(&mut self, src: T) -> Result<Value> {
+    pub fn eval<T: AsRef<[u8]>>(&mut self, src: T) -> Result<JsValue> {
         let main_timer = BoaProfiler::global().start_event("Main", "Main");
         let src_bytes: &[u8] = src.as_ref();
 
@@ -786,7 +791,7 @@ impl Context {
     /// ```
     #[cfg(feature = "vm")]
     #[allow(clippy::unit_arg, clippy::drop_copy)]
-    pub fn eval<T: AsRef<[u8]>>(&mut self, src: T) -> Result<Value> {
+    pub fn eval<T: AsRef<[u8]>>(&mut self, src: T) -> Result<JsValue> {
         let main_timer = BoaProfiler::global().start_event("Main", "Main");
         let src_bytes: &[u8] = src.as_ref();
 

boa/src/environment/declarative_environment_record.rs

@@ -12,7 +12,7 @@ use crate::{
     },
     gc::{Finalize, Trace},
     object::GcObject,
-    BoaProfiler, Context, Result, Value,
+    BoaProfiler, Context, JsValue, Result,
 };
 use gc::{Gc, GcCell};
 use rustc_hash::FxHashMap;
@@ -24,7 +24,7 @@ use rustc_hash::FxHashMap;
 /// From this point onwards, a binding is referring to one of these structures.
 #[derive(Trace, Finalize, Debug, Clone)]
 pub struct DeclarativeEnvironmentRecordBinding {
-    pub value: Option<Value>,
+    pub value: Option<JsValue>,
     pub can_delete: bool,
     pub mutable: bool,
     pub strict: bool,
@@ -104,7 +104,7 @@ impl EnvironmentRecordTrait for DeclarativeEnvironmentRecord {
         Ok(())
     }
 
-    fn initialize_binding(&self, name: &str, value: Value, _context: &mut Context) -> Result<()> {
+    fn initialize_binding(&self, name: &str, value: JsValue, _context: &mut Context) -> Result<()> {
         if let Some(ref mut record) = self.env_rec.borrow_mut().get_mut(name) {
             if record.value.is_none() {
                 record.value = Some(value);
@@ -118,7 +118,7 @@ impl EnvironmentRecordTrait for DeclarativeEnvironmentRecord {
     fn set_mutable_binding(
         &self,
         name: &str,
-        value: Value,
+        value: JsValue,
         mut strict: bool,
         context: &mut Context,
     ) -> Result<()> {
@@ -159,7 +159,12 @@ impl EnvironmentRecordTrait for DeclarativeEnvironmentRecord {
         Ok(())
     }
 
-    fn get_binding_value(&self, name: &str, _strict: bool, context: &mut Context) -> Result<Value> {
+    fn get_binding_value(
+        &self,
+        name: &str,
+        _strict: bool,
+        context: &mut Context,
+    ) -> Result<JsValue> {
         if let Some(binding) = self.env_rec.borrow().get(name) {
             if let Some(ref val) = binding.value {
                 Ok(val.clone())
@@ -189,8 +194,8 @@ impl EnvironmentRecordTrait for DeclarativeEnvironmentRecord {
         false
     }
 
-    fn get_this_binding(&self, _context: &mut Context) -> Result<Value> {
-        Ok(Value::undefined())
+    fn get_this_binding(&self, _context: &mut Context) -> Result<JsValue> {
+        Ok(JsValue::undefined())
     }
 
     fn has_super_binding(&self) -> bool {

boa/src/environment/environment_record_trait.rs

@@ -13,7 +13,7 @@ use crate::{environment::lexical_environment::VariableScope, object::GcObject};
 use crate::{
     environment::lexical_environment::{Environment, EnvironmentType},
     gc::{Finalize, Trace},
-    Context, Result, Value,
+    Context, JsValue, Result,
 };
 use std::fmt::Debug;
 
@@ -55,7 +55,7 @@ pub trait EnvironmentRecordTrait: Debug + Trace + Finalize {
     /// Set the value of an already existing but uninitialized binding in an Environment Record.
     /// The String value N is the text of the bound name.
     /// V is the value for the binding and is a value of any ECMAScript language type.
-    fn initialize_binding(&self, name: &str, value: Value, context: &mut Context) -> Result<()>;
+    fn initialize_binding(&self, name: &str, value: JsValue, context: &mut Context) -> Result<()>;
 
     /// Set the value of an already existing mutable binding in an Environment Record.
     /// The String value `name` is the text of the bound name.
@@ -64,7 +64,7 @@ pub trait EnvironmentRecordTrait: Debug + Trace + Finalize {
     fn set_mutable_binding(
         &self,
         name: &str,
-        value: Value,
+        value: JsValue,
         strict: bool,
         context: &mut Context,
     ) -> Result<()>;
@@ -73,7 +73,8 @@ pub trait EnvironmentRecordTrait: Debug + Trace + Finalize {
     /// The String value N is the text of the bound name.
     /// S is used to identify references originating in strict mode code or that
     /// otherwise require strict mode reference semantics.
-    fn get_binding_value(&self, name: &str, strict: bool, context: &mut Context) -> Result<Value>;
+    fn get_binding_value(&self, name: &str, strict: bool, context: &mut Context)
+        -> Result<JsValue>;
 
     /// Delete a binding from an Environment Record.
     /// The String value name is the text of the bound name.
@@ -86,7 +87,7 @@ pub trait EnvironmentRecordTrait: Debug + Trace + Finalize {
     fn has_this_binding(&self) -> bool;
 
     /// Return the `this` binding from the environment
-    fn get_this_binding(&self, context: &mut Context) -> Result<Value>;
+    fn get_this_binding(&self, context: &mut Context) -> Result<JsValue>;
 
     /// Determine if an Environment Record establishes a super method binding.
     /// Return true if it does and false if it does not.
@@ -109,13 +110,13 @@ pub trait EnvironmentRecordTrait: Debug + Trace + Finalize {
     fn get_environment_type(&self) -> EnvironmentType;
 
     /// Return the `this` binding from the environment or try to get it from outer environments
-    fn recursive_get_this_binding(&self, context: &mut Context) -> Result<Value> {
+    fn recursive_get_this_binding(&self, context: &mut Context) -> Result<JsValue> {
         if self.has_this_binding() {
             self.get_this_binding(context)
         } else {
             match self.get_outer_environment_ref() {
                 Some(outer) => outer.recursive_get_this_binding(context),
-                None => Ok(Value::Undefined),
+                None => Ok(JsValue::undefined()),
             }
         }
     }
@@ -158,7 +159,7 @@ pub trait EnvironmentRecordTrait: Debug + Trace + Finalize {
     fn recursive_set_mutable_binding(
         &self,
         name: &str,
-        value: Value,
+        value: JsValue,
         strict: bool,
         context: &mut Context,
     ) -> Result<()> {
@@ -175,7 +176,7 @@ pub trait EnvironmentRecordTrait: Debug + Trace + Finalize {
     fn recursive_initialize_binding(
         &self,
         name: &str,
-        value: Value,
+        value: JsValue,
         context: &mut Context,
     ) -> Result<()> {
         if self.has_binding(name) {
@@ -197,7 +198,7 @@ pub trait EnvironmentRecordTrait: Debug + Trace + Finalize {
     }
 
     /// Retrieve binding from current or any outer environment
-    fn recursive_get_binding_value(&self, name: &str, context: &mut Context) -> Result<Value> {
+    fn recursive_get_binding_value(&self, name: &str, context: &mut Context) -> Result<JsValue> {
         if self.has_binding(name) {
             self.get_binding_value(name, false, context)
         } else {

boa/src/environment/function_environment_record.rs

@@ -18,7 +18,7 @@ use crate::{
     },
     gc::{empty_trace, Finalize, Trace},
     object::GcObject,
-    Context, Result, Value,
+    Context, JsValue, Result,
 };
 
 /// Different binding status for `this`.
@@ -42,7 +42,7 @@ unsafe impl Trace for BindingStatus {
 pub struct FunctionEnvironmentRecord {
     pub declarative_record: DeclarativeEnvironmentRecord,
     /// This is the this value used for this invocation of the function.
-    pub this_value: Value,
+    pub this_value: JsValue,
     /// If the value is "lexical", this is an ArrowFunction and does not have a local this value.
     pub this_binding_status: BindingStatus,
     /// The function object whose invocation caused this Environment Record to be created.
@@ -50,28 +50,28 @@ pub struct FunctionEnvironmentRecord {
     /// If the associated function has super property accesses and is not an ArrowFunction,
     /// `[[HomeObject]]` is the object that the function is bound to as a method.
     /// The default value for `[[HomeObject]]` is undefined.
-    pub home_object: Value,
+    pub home_object: JsValue,
     /// If this Environment Record was created by the `[[Construct]]` internal method,
     /// `[[NewTarget]]` is the value of the `[[Construct]]` newTarget parameter.
     /// Otherwise, its value is undefined.
-    pub new_target: Value,
+    pub new_target: JsValue,
 }
 
 impl FunctionEnvironmentRecord {
     pub fn new(
         f: GcObject,
-        this: Option<Value>,
+        this: Option<JsValue>,
         outer: Option<Environment>,
         binding_status: BindingStatus,
-        new_target: Value,
+        new_target: JsValue,
     ) -> FunctionEnvironmentRecord {
         let mut func_env = FunctionEnvironmentRecord {
             declarative_record: DeclarativeEnvironmentRecord::new(outer), // the outer environment will come from Environment set as a private property of F - https://tc39.es/ecma262/#sec-ecmascript-function-objects
             function: f,
             this_binding_status: binding_status,
-            home_object: Value::undefined(),
+            home_object: JsValue::undefined(),
             new_target,
-            this_value: Value::undefined(),
+            this_value: JsValue::undefined(),
         };
         // If a `this` value has been passed, bind it to the environment
         if let Some(v) = this {
@@ -80,7 +80,7 @@ impl FunctionEnvironmentRecord {
         func_env
     }
 
-    pub fn bind_this_value(&mut self, value: Value) -> Result<Value> {
+    pub fn bind_this_value(&mut self, value: JsValue) -> Result<JsValue> {
         match self.this_binding_status {
             // You can not bind an arrow function, their `this` value comes from the lexical scope above
             BindingStatus::Lexical => {
@@ -99,10 +99,10 @@ impl FunctionEnvironmentRecord {
         }
     }
 
-    pub fn get_super_base(&self) -> Value {
+    pub fn get_super_base(&self) -> JsValue {
         let home = &self.home_object;
         if home.is_undefined() {
-            Value::Undefined
+            JsValue::undefined()
         } else {
             assert!(home.is_object());
             home.as_object()
@@ -138,7 +138,7 @@ impl EnvironmentRecordTrait for FunctionEnvironmentRecord {
             .create_immutable_binding(name, strict, context)
     }
 
-    fn initialize_binding(&self, name: &str, value: Value, context: &mut Context) -> Result<()> {
+    fn initialize_binding(&self, name: &str, value: JsValue, context: &mut Context) -> Result<()> {
         self.declarative_record
             .initialize_binding(name, value, context)
     }
@@ -146,7 +146,7 @@ impl EnvironmentRecordTrait for FunctionEnvironmentRecord {
     fn set_mutable_binding(
         &self,
         name: &str,
-        value: Value,
+        value: JsValue,
         strict: bool,
         context: &mut Context,
     ) -> Result<()> {
@@ -154,7 +154,12 @@ impl EnvironmentRecordTrait for FunctionEnvironmentRecord {
             .set_mutable_binding(name, value, strict, context)
     }
 
-    fn get_binding_value(&self, name: &str, strict: bool, context: &mut Context) -> Result<Value> {
+    fn get_binding_value(
+        &self,
+        name: &str,
+        strict: bool,
+        context: &mut Context,
+    ) -> Result<JsValue> {
         self.declarative_record
             .get_binding_value(name, strict, context)
     }
@@ -167,7 +172,7 @@ impl EnvironmentRecordTrait for FunctionEnvironmentRecord {
         !matches!(self.this_binding_status, BindingStatus::Lexical)
     }
 
-    fn get_this_binding(&self, context: &mut Context) -> Result<Value> {
+    fn get_this_binding(&self, context: &mut Context) -> Result<JsValue> {
         match self.this_binding_status {
             BindingStatus::Lexical => {
                 panic!("There is no this for a lexical function record");

boa/src/environment/global_environment_record.rs

@@ -17,7 +17,7 @@ use crate::{
     gc::{Finalize, Trace},
     object::GcObject,
     property::PropertyDescriptor,
-    Context, Result, Value,
+    Context, JsValue, Result,
 };
 use gc::{Gc, GcCell};
 use rustc_hash::FxHashSet;
@@ -111,7 +111,7 @@ impl GlobalEnvironmentRecord {
         let extensible = global_object.is_extensible();
         if !has_property && extensible {
             obj_rec.create_mutable_binding(name.clone(), deletion, false, context)?;
-            obj_rec.initialize_binding(&name, Value::undefined(), context)?;
+            obj_rec.initialize_binding(&name, JsValue::undefined(), context)?;
         }
 
         let mut var_declared_names = self.var_names.borrow_mut();
@@ -121,7 +121,7 @@ impl GlobalEnvironmentRecord {
         Ok(())
     }
 
-    pub fn create_global_function_binding(&mut self, name: &str, value: Value, deletion: bool) {
+    pub fn create_global_function_binding(&mut self, name: &str, value: JsValue, deletion: bool) {
         let global_object = &mut self.object_record.bindings;
         let existing_prop = global_object.get_property(name);
         // TODO: change to desc.is_undefined()
@@ -184,7 +184,7 @@ impl EnvironmentRecordTrait for GlobalEnvironmentRecord {
             .create_immutable_binding(name, strict, context)
     }
 
-    fn initialize_binding(&self, name: &str, value: Value, context: &mut Context) -> Result<()> {
+    fn initialize_binding(&self, name: &str, value: JsValue, context: &mut Context) -> Result<()> {
         if self.declarative_record.has_binding(name) {
             return self
                 .declarative_record
@@ -201,7 +201,7 @@ impl EnvironmentRecordTrait for GlobalEnvironmentRecord {
     fn set_mutable_binding(
         &self,
         name: &str,
-        value: Value,
+        value: JsValue,
         strict: bool,
         context: &mut Context,
     ) -> Result<()> {
@@ -214,7 +214,12 @@ impl EnvironmentRecordTrait for GlobalEnvironmentRecord {
             .set_mutable_binding(name, value, strict, context)
     }
 
-    fn get_binding_value(&self, name: &str, strict: bool, context: &mut Context) -> Result<Value> {
+    fn get_binding_value(
+        &self,
+        name: &str,
+        strict: bool,
+        context: &mut Context,
+    ) -> Result<JsValue> {
         if self.declarative_record.has_binding(name) {
             return self
                 .declarative_record
@@ -228,7 +233,7 @@ impl EnvironmentRecordTrait for GlobalEnvironmentRecord {
             return self.declarative_record.delete_binding(name);
         }
 
-        let global: &Value = &self.object_record.bindings;
+        let global: &JsValue = &self.object_record.bindings;
         if global.has_field(name) {
             let status = self.object_record.delete_binding(name);
             if status {
@@ -246,7 +251,7 @@ impl EnvironmentRecordTrait for GlobalEnvironmentRecord {
         true
     }
 
-    fn get_this_binding(&self, _context: &mut Context) -> Result<Value> {
+    fn get_this_binding(&self, _context: &mut Context) -> Result<JsValue> {
         Ok(self.global_this_binding.clone().into())
     }
 
@@ -298,7 +303,7 @@ impl EnvironmentRecordTrait for GlobalEnvironmentRecord {
     fn recursive_set_mutable_binding(
         &self,
         name: &str,
-        value: Value,
+        value: JsValue,
         strict: bool,
         context: &mut Context,
     ) -> Result<()> {
@@ -308,7 +313,7 @@ impl EnvironmentRecordTrait for GlobalEnvironmentRecord {
     fn recursive_initialize_binding(
         &self,
         name: &str,
-        value: Value,
+        value: JsValue,
         context: &mut Context,
     ) -> Result<()> {
         self.initialize_binding(name, value, context)

boa/src/environment/lexical_environment.rs

@@ -8,7 +8,7 @@
 use super::global_environment_record::GlobalEnvironmentRecord;
 use crate::{
     environment::environment_record_trait::EnvironmentRecordTrait, object::GcObject, BoaProfiler,
-    Context, Result, Value,
+    Context, JsValue, Result,
 };
 use gc::Gc;
 use std::{collections::VecDeque, error, fmt};
@@ -88,7 +88,7 @@ impl Context {
         self.realm.environment.environment_stack.pop_back()
     }
 
-    pub(crate) fn get_this_binding(&mut self) -> Result<Value> {
+    pub(crate) fn get_this_binding(&mut self) -> Result<JsValue> {
         self.get_current_environment()
             .recursive_get_this_binding(self)
     }
@@ -116,14 +116,14 @@ impl Context {
     pub(crate) fn set_mutable_binding(
         &mut self,
         name: &str,
-        value: Value,
+        value: JsValue,
         strict: bool,
     ) -> Result<()> {
         self.get_current_environment()
             .recursive_set_mutable_binding(name, value, strict, self)
     }
 
-    pub(crate) fn initialize_binding(&mut self, name: &str, value: Value) -> Result<()> {
+    pub(crate) fn initialize_binding(&mut self, name: &str, value: JsValue) -> Result<()> {
         self.get_current_environment()
             .recursive_initialize_binding(name, value, self)
     }
@@ -143,7 +143,7 @@ impl Context {
         self.get_current_environment().recursive_has_binding(name)
     }
 
-    pub(crate) fn get_binding_value(&mut self, name: &str) -> Result<Value> {
+    pub(crate) fn get_binding_value(&mut self, name: &str) -> Result<JsValue> {
         self.get_current_environment()
             .recursive_get_binding_value(name, self)
     }

boa/src/environment/object_environment_record.rs

@@ -16,19 +16,19 @@ use crate::{
     gc::{Finalize, Trace},
     object::GcObject,
     property::PropertyDescriptor,
-    Context, Result, Value,
+    Context, JsValue, Result,
 };
 
 #[derive(Debug, Trace, Finalize, Clone)]
 pub struct ObjectEnvironmentRecord {
     // TODO: bindings should be an object.
-    pub bindings: Value,
+    pub bindings: JsValue,
     pub with_environment: bool,
     pub outer_env: Option<Environment>,
 }
 
 impl ObjectEnvironmentRecord {
-    pub fn new(object: Value, environment: Option<Environment>) -> ObjectEnvironmentRecord {
+    pub fn new(object: JsValue, environment: Option<Environment>) -> ObjectEnvironmentRecord {
         ObjectEnvironmentRecord {
             bindings: object,
             outer_env: environment,
@@ -65,7 +65,7 @@ impl EnvironmentRecordTrait for ObjectEnvironmentRecord {
         // only for it to be replace with the real value later. We could just add the name to a Vector instead
         let bindings = &self.bindings;
         let prop = PropertyDescriptor::builder()
-            .value(Value::undefined())
+            .value(JsValue::undefined())
             .writable(true)
             .enumerable(true)
             .configurable(deletion);
@@ -83,7 +83,7 @@ impl EnvironmentRecordTrait for ObjectEnvironmentRecord {
         Ok(())
     }
 
-    fn initialize_binding(&self, name: &str, value: Value, context: &mut Context) -> Result<()> {
+    fn initialize_binding(&self, name: &str, value: JsValue, context: &mut Context) -> Result<()> {
         // We should never need to check if a binding has been created,
         // As all calls to create_mutable_binding are followed by initialized binding
         // The below is just a check.
@@ -94,7 +94,7 @@ impl EnvironmentRecordTrait for ObjectEnvironmentRecord {
     fn set_mutable_binding(
         &self,
         name: &str,
-        value: Value,
+        value: JsValue,
         strict: bool,
         _context: &mut Context,
     ) -> Result<()> {
@@ -110,7 +110,12 @@ impl EnvironmentRecordTrait for ObjectEnvironmentRecord {
         Ok(())
     }
 
-    fn get_binding_value(&self, name: &str, strict: bool, context: &mut Context) -> Result<Value> {
+    fn get_binding_value(
+        &self,
+        name: &str,
+        strict: bool,
+        context: &mut Context,
+    ) -> Result<JsValue> {
         if self.bindings.has_field(name) {
             Ok(self
                 .bindings
@@ -118,11 +123,11 @@ impl EnvironmentRecordTrait for ObjectEnvironmentRecord {
                 .as_ref()
                 .and_then(|prop| prop.value())
                 .cloned()
-                .unwrap_or(Value::Undefined))
+                .unwrap_or_default())
         } else if strict {
             context.throw_reference_error(format!("{} has no binding", name))
         } else {
-            Ok(Value::undefined())
+            Ok(JsValue::undefined())
         }
     }
 
@@ -135,8 +140,8 @@ impl EnvironmentRecordTrait for ObjectEnvironmentRecord {
         false
     }
 
-    fn get_this_binding(&self, _context: &mut Context) -> Result<Value> {
-        Ok(Value::undefined())
+    fn get_this_binding(&self, _context: &mut Context) -> Result<JsValue> {
+        Ok(JsValue::undefined())
     }
 
     fn has_super_binding(&self) -> bool {

boa/src/exec/mod.rs

@@ -3,11 +3,11 @@
 #[cfg(test)]
 mod tests;
 
-use crate::{Context, Result, Value};
+use crate::{Context, JsValue, Result};
 
 pub trait Executable {
     /// Runs this executable in the given context.
-    fn run(&self, context: &mut Context) -> Result<Value>;
+    fn run(&self, context: &mut Context) -> Result<JsValue>;
 }
 
 #[derive(Debug, Eq, PartialEq)]

boa/src/exec/tests.rs

@@ -1,4 +1,4 @@
-use crate::{builtins::Number, exec, forward, forward_val, Context, Value};
+use crate::{builtins::Number, exec, forward, forward_val, Context, JsValue};
 
 #[test]
 fn function_declaration_returns_undefined() {
@@ -899,19 +899,19 @@ fn function_decl_hoisting() {
 fn to_bigint() {
     let mut context = Context::new();
 
-    assert!(Value::null().to_bigint(&mut context).is_err());
-    assert!(Value::undefined().to_bigint(&mut context).is_err());
-    assert!(Value::integer(55).to_bigint(&mut context).is_ok());
-    assert!(Value::rational(10.0).to_bigint(&mut context).is_ok());
-    assert!(Value::string("100").to_bigint(&mut context).is_ok());
+    assert!(JsValue::null().to_bigint(&mut context).is_err());
+    assert!(JsValue::undefined().to_bigint(&mut context).is_err());
+    assert!(JsValue::new(55).to_bigint(&mut context).is_ok());
+    assert!(JsValue::new(10.0).to_bigint(&mut context).is_ok());
+    assert!(JsValue::new("100").to_bigint(&mut context).is_ok());
 }
 
 #[test]
 fn to_index() {
     let mut context = Context::new();
 
-    assert_eq!(Value::undefined().to_index(&mut context).unwrap(), 0);
-    assert!(Value::integer(-1).to_index(&mut context).is_err());
+    assert_eq!(JsValue::undefined().to_index(&mut context).unwrap(), 0);
+    assert!(JsValue::new(-1).to_index(&mut context).is_err());
 }
 
 #[test]
@@ -919,34 +919,34 @@ fn to_integer() {
     let mut context = Context::new();
 
     assert!(Number::equal(
-        Value::number(f64::NAN).to_integer(&mut context).unwrap(),
+        JsValue::nan().to_integer(&mut context).unwrap(),
         0.0
     ));
     assert!(Number::equal(
-        Value::number(f64::NEG_INFINITY)
+        JsValue::new(f64::NEG_INFINITY)
             .to_integer(&mut context)
             .unwrap(),
         f64::NEG_INFINITY
     ));
     assert!(Number::equal(
-        Value::number(f64::INFINITY)
+        JsValue::new(f64::INFINITY)
             .to_integer(&mut context)
             .unwrap(),
         f64::INFINITY
     ));
     assert!(Number::equal(
-        Value::number(0.0).to_integer(&mut context).unwrap(),
+        JsValue::new(0.0).to_integer(&mut context).unwrap(),
         0.0
     ));
-    let number = Value::number(-0.0).to_integer(&mut context).unwrap();
+    let number = JsValue::new(-0.0).to_integer(&mut context).unwrap();
     assert!(!number.is_sign_negative());
     assert!(Number::equal(number, 0.0));
     assert!(Number::equal(
-        Value::number(20.9).to_integer(&mut context).unwrap(),
+        JsValue::new(20.9).to_integer(&mut context).unwrap(),
         20.0
     ));
     assert!(Number::equal(
-        Value::number(-20.9).to_integer(&mut context).unwrap(),
+        JsValue::new(-20.9).to_integer(&mut context).unwrap(),
         -20.0
     ));
 }
@@ -955,31 +955,29 @@ fn to_integer() {
 fn to_length() {
     let mut context = Context::new();
 
-    assert_eq!(Value::number(f64::NAN).to_length(&mut context).unwrap(), 0);
+    assert_eq!(JsValue::new(f64::NAN).to_length(&mut context).unwrap(), 0);
     assert_eq!(
-        Value::number(f64::NEG_INFINITY)
+        JsValue::new(f64::NEG_INFINITY)
             .to_length(&mut context)
             .unwrap(),
         0
     );
     assert_eq!(
-        Value::number(f64::INFINITY)
-            .to_length(&mut context)
-            .unwrap(),
+        JsValue::new(f64::INFINITY).to_length(&mut context).unwrap(),
         Number::MAX_SAFE_INTEGER as usize
     );
-    assert_eq!(Value::number(0.0).to_length(&mut context).unwrap(), 0);
-    assert_eq!(Value::number(-0.0).to_length(&mut context).unwrap(), 0);
-    assert_eq!(Value::number(20.9).to_length(&mut context).unwrap(), 20);
-    assert_eq!(Value::number(-20.9).to_length(&mut context).unwrap(), 0);
+    assert_eq!(JsValue::new(0.0).to_length(&mut context).unwrap(), 0);
+    assert_eq!(JsValue::new(-0.0).to_length(&mut context).unwrap(), 0);
+    assert_eq!(JsValue::new(20.9).to_length(&mut context).unwrap(), 20);
+    assert_eq!(JsValue::new(-20.9).to_length(&mut context).unwrap(), 0);
     assert_eq!(
-        Value::number(100000000000.0)
+        JsValue::new(100000000000.0)
             .to_length(&mut context)
             .unwrap() as u64,
         100000000000
     );
     assert_eq!(
-        Value::number(4010101101.0).to_length(&mut context).unwrap(),
+        JsValue::new(4010101101.0).to_length(&mut context).unwrap(),
         4010101101
     );
 }
@@ -990,7 +988,7 @@ fn to_int32() {
 
     macro_rules! check_to_int32 {
         ($from:expr => $to:expr) => {
-            assert_eq!(Value::from($from).to_i32(&mut context).unwrap(), $to);
+            assert_eq!(JsValue::new($from).to_i32(&mut context).unwrap(), $to);
         };
     }
 
@@ -1101,15 +1099,15 @@ fn to_int32() {
 fn to_string() {
     let mut context = Context::new();
 
-    assert_eq!(Value::null().to_string(&mut context).unwrap(), "null");
+    assert_eq!(JsValue::null().to_string(&mut context).unwrap(), "null");
     assert_eq!(
-        Value::undefined().to_string(&mut context).unwrap(),
+        JsValue::undefined().to_string(&mut context).unwrap(),
         "undefined"
     );
-    assert_eq!(Value::integer(55).to_string(&mut context).unwrap(), "55");
-    assert_eq!(Value::rational(55.0).to_string(&mut context).unwrap(), "55");
+    assert_eq!(JsValue::new(55).to_string(&mut context).unwrap(), "55");
+    assert_eq!(JsValue::new(55.0).to_string(&mut context).unwrap(), "55");
     assert_eq!(
-        Value::string("hello").to_string(&mut context).unwrap(),
+        JsValue::new("hello").to_string(&mut context).unwrap(),
         "hello"
     );
 }
@@ -1132,11 +1130,11 @@ fn calling_function_with_unspecified_arguments() {
 fn to_object() {
     let mut context = Context::new();
 
-    assert!(Value::undefined()
+    assert!(JsValue::undefined()
         .to_object(&mut context)
         .unwrap_err()
         .is_object());
-    assert!(Value::null()
+    assert!(JsValue::null()
         .to_object(&mut context)
         .unwrap_err()
         .is_object());

boa/src/lib.rs

@@ -69,7 +69,7 @@ pub(crate) use crate::{exec::Executable, profiler::BoaProfiler};
 // Export things to root level
 #[doc(inline)]
 pub use crate::{
-    bigint::JsBigInt, context::Context, string::JsString, symbol::JsSymbol, value::Value,
+    bigint::JsBigInt, context::Context, string::JsString, symbol::JsSymbol, value::JsValue,
 };
 
 use crate::syntax::{
@@ -79,7 +79,7 @@ use crate::syntax::{
 
 /// The result of a Javascript expression is represented like this so it can succeed (`Ok`) or fail (`Err`)
 #[must_use]
-pub type Result<T> = StdResult<T, Value>;
+pub type Result<T> = StdResult<T, JsValue>;
 
 /// Parses the given source code.
 ///
@@ -122,7 +122,7 @@ pub(crate) fn forward<T: AsRef<[u8]>>(context: &mut Context, src: T) -> String {
 /// If the interpreter fails parsing an error value is returned instead (error object)
 #[allow(clippy::unit_arg, clippy::drop_copy)]
 #[cfg(test)]
-pub(crate) fn forward_val<T: AsRef<[u8]>>(context: &mut Context, src: T) -> Result<Value> {
+pub(crate) fn forward_val<T: AsRef<[u8]>>(context: &mut Context, src: T) -> Result<JsValue> {
     let main_timer = BoaProfiler::global().start_event("Main", "Main");
 
     let src_bytes: &[u8] = src.as_ref();

boa/src/object/gcobject.rs

@@ -16,7 +16,7 @@ use crate::{
     symbol::WellKnownSymbols,
     syntax::ast::node::RcStatementList,
     value::PreferredType,
-    Context, Executable, Result, Value,
+    Context, Executable, JsValue, Result,
 };
 use gc::{Finalize, Gc, GcCell, GcCellRef, GcCellRefMut, Trace};
 use serde_json::{map::Map, Value as JSONValue};
@@ -125,11 +125,11 @@ impl GcObject {
     #[track_caller]
     fn call_construct(
         &self,
-        this_target: &Value,
-        args: &[Value],
+        this_target: &JsValue,
+        args: &[JsValue],
         context: &mut Context,
         construct: bool,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         let this_function_object = self.clone();
         let mut has_parameter_expressions = false;
 
@@ -178,7 +178,7 @@ impl GcObject {
                                     .prototype()
                                     .into()
                             };
-                            Value::from(Object::create(proto))
+                            JsValue::new(Object::create(proto))
                         } else {
                             this_target.clone()
                         };
@@ -199,7 +199,7 @@ impl GcObject {
                             } else {
                                 BindingStatus::Uninitialized
                             },
-                            Value::undefined(),
+                            JsValue::undefined(),
                         );
 
                         let mut arguments_in_parameter_names = false;
@@ -249,7 +249,7 @@ impl GcObject {
                             }
 
                             let value = match args.get(i).cloned() {
-                                None | Some(Value::Undefined) => param
+                                None | Some(JsValue::Undefined) => param
                                     .init()
                                     .map(|init| init.run(context).ok())
                                     .flatten()
@@ -280,7 +280,7 @@ impl GcObject {
                                 } else {
                                     BindingStatus::Uninitialized
                                 },
-                                Value::undefined(),
+                                JsValue::undefined(),
                             );
                             context.push_environment(second_env);
                         }
@@ -298,7 +298,7 @@ impl GcObject {
                 function(this_target, args, context)
             }
             FunctionBody::BuiltInConstructor(function) => {
-                function(&Value::undefined(), args, context)
+                function(&JsValue::undefined(), args, context)
             }
             FunctionBody::BuiltInFunction(function) => function(this_target, args, context),
             FunctionBody::Closure(function) => (function)(this_target, args, context),
@@ -329,7 +329,7 @@ impl GcObject {
     // <https://tc39.es/ecma262/#sec-ecmascript-function-objects-call-thisargument-argumentslist>
     #[track_caller]
     #[inline]
-    pub fn call(&self, this: &Value, args: &[Value], context: &mut Context) -> Result<Value> {
+    pub fn call(&self, this: &JsValue, args: &[JsValue], context: &mut Context) -> Result<JsValue> {
         self.call_construct(this, args, context, false)
     }
 
@@ -343,10 +343,10 @@ impl GcObject {
     #[inline]
     pub fn construct(
         &self,
-        args: &[Value],
-        new_target: &Value,
+        args: &[JsValue],
+        new_target: &JsValue,
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         self.call_construct(new_target, args, context, true)
     }
 
@@ -372,7 +372,7 @@ impl GcObject {
         &self,
         context: &mut Context,
         hint: PreferredType,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         // 1. Assert: Type(O) is Object.
         //      Already is GcObject by type.
         // 2. Assert: Type(hint) is String and its value is either "string" or "number".
@@ -386,8 +386,8 @@ impl GcObject {
         if recursion_limiter.live {
             // we're in a recursive object, bail
             return Ok(match hint {
-                PreferredType::Number => Value::from(0),
-                PreferredType::String => Value::from(""),
+                PreferredType::Number => JsValue::new(0),
+                PreferredType::String => JsValue::new(""),
                 PreferredType::Default => unreachable!("checked type hint in step 2"),
             });
         }
@@ -403,10 +403,10 @@ impl GcObject {
         };
 
         // 5. For each name in methodNames in List order, do
-        let this = Value::from(self.clone());
+        let this = JsValue::new(self.clone());
         for name in &method_names {
             // a. Let method be ? Get(O, name).
-            let method: Value = this.get_field(*name, context)?;
+            let method: JsValue = this.get_field(*name, context)?;
             // b. If IsCallable(method) is true, then
             if method.is_function() {
                 // i. Let result be ? Call(method, O).
@@ -436,7 +436,7 @@ impl GcObject {
                 .collect();
             keys.sort_unstable();
             let mut arr: Vec<JSONValue> = Vec::with_capacity(keys.len());
-            let this = Value::from(self.clone());
+            let this = JsValue::new(self.clone());
             for key in keys {
                 let value = this.get_field(key, context)?;
                 if let Some(value) = value.to_json(context)? {
@@ -448,7 +448,7 @@ impl GcObject {
             Ok(Some(JSONValue::Array(arr)))
         } else {
             let mut new_obj = Map::new();
-            let this = Value::from(self.clone());
+            let this = JsValue::new(self.clone());
             let keys: Vec<PropertyKey> = self.borrow().properties.keys().collect();
             for k in keys {
                 let key = k.clone();
@@ -522,7 +522,7 @@ impl GcObject {
     /// Panics if the object is currently mutably borrowed.
     #[inline]
     #[track_caller]
-    pub fn prototype_instance(&self) -> Value {
+    pub fn prototype_instance(&self) -> JsValue {
         self.borrow().prototype_instance().clone()
     }
 
@@ -534,7 +534,7 @@ impl GcObject {
     /// or if th prototype is not an object or undefined.
     #[inline]
     #[track_caller]
-    pub fn set_prototype_instance(&self, prototype: Value) -> bool {
+    pub fn set_prototype_instance(&self, prototype: JsValue) -> bool {
         self.borrow_mut().set_prototype_instance(prototype)
     }
 
@@ -720,7 +720,7 @@ impl GcObject {
     pub(crate) fn ordinary_has_instance(
         &self,
         context: &mut Context,
-        value: &Value,
+        value: &JsValue,
     ) -> Result<bool> {
         // 1. If IsCallable(C) is false, return false.
         if !self.is_callable() {
@@ -771,9 +771,9 @@ impl GcObject {
     /// [spec]: https://tc39.es/ecma262/#sec-speciesconstructor
     pub(crate) fn species_constructor(
         &self,
-        default_constructor: Value,
+        default_constructor: JsValue,
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         // 1. Assert: Type(O) is Object.
 
         // 2. Let C be ? Get(O, "constructor").

boa/src/object/internal_methods.rs

@@ -8,7 +8,7 @@
 use crate::{
     object::{GcObject, Object, ObjectData},
     property::{DescriptorKind, PropertyDescriptor, PropertyKey},
-    value::{Type, Value},
+    value::{JsValue, Type},
     BoaProfiler, Context, Result,
 };
 
@@ -106,7 +106,7 @@ impl GcObject {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-get-o-p
     #[inline]
-    pub fn get<K>(&self, key: K, context: &mut Context) -> Result<Value>
+    pub fn get<K>(&self, key: K, context: &mut Context) -> Result<JsValue>
     where
         K: Into<PropertyKey>,
     {
@@ -126,7 +126,7 @@ impl GcObject {
     pub fn set<K, V>(&self, key: K, value: V, throw: bool, context: &mut Context) -> Result<bool>
     where
         K: Into<PropertyKey>,
-        V: Into<Value>,
+        V: Into<JsValue>,
     {
         let key = key.into();
         // 1. Assert: Type(O) is Object.
@@ -188,7 +188,7 @@ impl GcObject {
     ) -> Result<bool>
     where
         K: Into<PropertyKey>,
-        V: Into<Value>,
+        V: Into<JsValue>,
     {
         // 1. Assert: Type(O) is Object.
         // 2. Assert: IsPropertyKey(P) is true.
@@ -216,7 +216,7 @@ impl GcObject {
     ) -> Result<bool>
     where
         K: Into<PropertyKey>,
-        V: Into<Value>,
+        V: Into<JsValue>,
     {
         let key = key.into();
         // 1. Assert: Type(O) is Object.
@@ -237,7 +237,7 @@ impl GcObject {
         let prop = self.__get_own_property__(key);
         if prop.is_none() {
             let parent = self.__get_prototype_of__();
-            return if let Value::Object(ref object) = parent {
+            return if let JsValue::Object(ref object) = parent {
                 object.__has_property__(key)
             } else {
                 false
@@ -286,16 +286,16 @@ impl GcObject {
     pub fn __get__(
         &self,
         key: &PropertyKey,
-        receiver: Value,
+        receiver: JsValue,
         context: &mut Context,
-    ) -> Result<Value> {
+    ) -> Result<JsValue> {
         match self.__get_own_property__(key) {
             None => {
                 // parent will either be null or an Object
                 if let Some(parent) = self.__get_prototype_of__().as_object() {
                     Ok(parent.__get__(key, receiver, context)?)
                 } else {
-                    Ok(Value::undefined())
+                    Ok(JsValue::undefined())
                 }
             }
             Some(ref desc) => match desc.kind() {
@@ -305,7 +305,7 @@ impl GcObject {
                 DescriptorKind::Accessor { get: Some(get), .. } if !get.is_undefined() => {
                     context.call(get, &receiver, &[])
                 }
-                _ => Ok(Value::undefined()),
+                _ => Ok(JsValue::undefined()),
             },
         }
     }
@@ -314,8 +314,8 @@ impl GcObject {
     pub fn __set__(
         &self,
         key: PropertyKey,
-        value: Value,
-        receiver: Value,
+        value: JsValue,
+        receiver: JsValue,
         context: &mut Context,
     ) -> Result<bool> {
         let _timer = BoaProfiler::global().start_event("Object::set", "object");
@@ -327,7 +327,7 @@ impl GcObject {
             return parent.__set__(key, value, receiver, context);
         } else {
             PropertyDescriptor::builder()
-                .value(Value::undefined())
+                .value(JsValue::undefined())
                 .writable(true)
                 .enumerable(true)
                 .configurable(true)
@@ -448,17 +448,17 @@ impl GcObject {
                 if matches!(desc.writable(), Some(true)) {
                     return false;
                 }
-                if matches!(desc.value(), Some(value) if !Value::same_value(value, current.expect_value()))
+                if matches!(desc.value(), Some(value) if !JsValue::same_value(value, current.expect_value()))
                 {
                     return false;
                 }
                 return true;
             }
         } else if !current.expect_configurable() {
-            if matches!(desc.set(), Some(set) if !Value::same_value(set, current.expect_set())) {
+            if matches!(desc.set(), Some(set) if !JsValue::same_value(set, current.expect_set())) {
                 return false;
             }
-            if matches!(desc.get(), Some(get) if !Value::same_value(get, current.expect_get())) {
+            if matches!(desc.get(), Some(get) if !JsValue::same_value(get, current.expect_get())) {
                 return false;
             }
             return true;
@@ -623,7 +623,7 @@ impl GcObject {
                 let result_str = string
                     .encode_utf16()
                     .nth(pos)
-                    .map(|utf16_val| Value::from(String::from_utf16_lossy(&[utf16_val])))?;
+                    .map(|utf16_val| JsValue::from(String::from_utf16_lossy(&[utf16_val])))?;
 
                 let desc = PropertyDescriptor::builder()
                     .value(result_str)
@@ -690,7 +690,7 @@ impl GcObject {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-object.defineproperties
     #[inline]
-    pub fn define_properties(&mut self, props: Value, context: &mut Context) -> Result<()> {
+    pub fn define_properties(&mut self, props: JsValue, context: &mut Context) -> Result<()> {
         let props = &props.to_object(context)?;
         let keys = props.own_property_keys();
         let mut descriptors: Vec<(PropertyKey, PropertyDescriptor)> = Vec::new();
@@ -724,10 +724,10 @@ impl GcObject {
     /// [spec]: https://tc39.es/ecma262/#sec-ordinary-object-internal-methods-and-internal-slots-setprototypeof-v
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/setPrototypeOf
     #[inline]
-    pub fn __set_prototype_of__(&mut self, val: Value) -> bool {
+    pub fn __set_prototype_of__(&mut self, val: JsValue) -> bool {
         debug_assert!(val.is_object() || val.is_null());
         let current = self.__get_prototype_of__();
-        if Value::same_value(&current, &val) {
+        if JsValue::same_value(&current, &val) {
             return true;
         }
         if !self.__is_extensible__() {
@@ -738,7 +738,7 @@ impl GcObject {
         while !done {
             if p.is_null() {
                 done = true
-            } else if Value::same_value(&Value::from(self.clone()), &p) {
+            } else if JsValue::same_value(&JsValue::new(self.clone()), &p) {
                 return false;
             } else {
                 let prototype = p
@@ -762,7 +762,7 @@ impl GcObject {
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getPrototypeOf
     #[inline]
     #[track_caller]
-    pub fn __get_prototype_of__(&self) -> Value {
+    pub fn __get_prototype_of__(&self) -> JsValue {
         self.borrow().prototype.clone()
     }
 
@@ -837,7 +837,7 @@ impl GcObject {
         &self,
         element_types: &[Type],
         context: &mut Context,
-    ) -> Result<Vec<Value>> {
+    ) -> Result<Vec<JsValue>> {
         // 1. If elementTypes is not present, set elementTypes to « Undefined, Null, Boolean, String, Symbol, Number, BigInt, Object ».
         let types = if element_types.is_empty() {
             &[

boa/src/object/mod.rs

@@ -15,7 +15,7 @@ use crate::{
     context::StandardConstructor,
     gc::{Finalize, Trace},
     property::{Attribute, PropertyDescriptor, PropertyKey},
-    BoaProfiler, Context, JsBigInt, JsString, JsSymbol, Value,
+    BoaProfiler, Context, JsBigInt, JsString, JsSymbol, JsValue,
 };
 use std::{
     any::Any,
@@ -68,7 +68,7 @@ pub struct Object {
     pub data: ObjectData,
     properties: PropertyMap,
     /// Instance prototype `__proto__`.
-    prototype: Value,
+    prototype: JsValue,
     /// Whether it can have new properties added to it.
     extensible: bool,
 }
@@ -78,7 +78,7 @@ pub struct Object {
 pub enum ObjectData {
     Array,
     ArrayIterator(ArrayIterator),
-    Map(OrderedMap<Value>),
+    Map(OrderedMap<JsValue>),
     MapIterator(MapIterator),
     RegExp(Box<RegExp>),
     RegExpStringIterator(RegExpStringIterator),
@@ -86,7 +86,7 @@ pub enum ObjectData {
     Boolean(bool),
     ForInIterator(ForInIterator),
     Function(Function),
-    Set(OrderedSet<Value>),
+    Set(OrderedSet<JsValue>),
     SetIterator(SetIterator),
     String(JsString),
     StringIterator(StringIterator),
@@ -138,7 +138,7 @@ impl Default for Object {
         Self {
             data: ObjectData::Ordinary,
             properties: PropertyMap::default(),
-            prototype: Value::null(),
+            prototype: JsValue::null(),
             extensible: true,
         }
     }
@@ -152,7 +152,7 @@ impl Object {
 
     /// Return a new ObjectData struct, with `kind` set to Ordinary
     #[inline]
-    pub fn function(function: Function, prototype: Value) -> Self {
+    pub fn function(function: Function, prototype: JsValue) -> Self {
         let _timer = BoaProfiler::global().start_event("Object::Function", "object");
 
         Self {
@@ -171,7 +171,7 @@ impl Object {
     /// [spec]: https://tc39.es/ecma262/#sec-objectcreate
     // TODO: proto should be a &Value here
     #[inline]
-    pub fn create(proto: Value) -> Self {
+    pub fn create(proto: JsValue) -> Self {
         let mut obj = Self::new();
         obj.prototype = proto;
         obj
@@ -183,7 +183,7 @@ impl Object {
         Self {
             data: ObjectData::Boolean(value),
             properties: PropertyMap::default(),
-            prototype: Value::null(),
+            prototype: JsValue::null(),
             extensible: true,
         }
     }
@@ -194,7 +194,7 @@ impl Object {
         Self {
             data: ObjectData::Number(value),
             properties: PropertyMap::default(),
-            prototype: Value::null(),
+            prototype: JsValue::null(),
             extensible: true,
         }
     }
@@ -208,7 +208,7 @@ impl Object {
         Self {
             data: ObjectData::String(value.into()),
             properties: PropertyMap::default(),
-            prototype: Value::null(),
+            prototype: JsValue::null(),
             extensible: true,
         }
     }
@@ -219,7 +219,7 @@ impl Object {
         Self {
             data: ObjectData::BigInt(value),
             properties: PropertyMap::default(),
-            prototype: Value::null(),
+            prototype: JsValue::null(),
             extensible: true,
         }
     }
@@ -233,7 +233,7 @@ impl Object {
         Self {
             data: ObjectData::NativeObject(Box::new(value)),
             properties: PropertyMap::default(),
-            prototype: Value::null(),
+            prototype: JsValue::null(),
             extensible: true,
         }
     }
@@ -335,7 +335,7 @@ impl Object {
     }
 
     #[inline]
-    pub fn as_map_ref(&self) -> Option<&OrderedMap<Value>> {
+    pub fn as_map_ref(&self) -> Option<&OrderedMap<JsValue>> {
         match self.data {
             ObjectData::Map(ref map) => Some(map),
             _ => None,
@@ -343,7 +343,7 @@ impl Object {
     }
 
     #[inline]
-    pub fn as_map_mut(&mut self) -> Option<&mut OrderedMap<Value>> {
+    pub fn as_map_mut(&mut self) -> Option<&mut OrderedMap<JsValue>> {
         match &mut self.data {
             ObjectData::Map(map) => Some(map),
             _ => None,
@@ -364,7 +364,7 @@ impl Object {
     }
 
     #[inline]
-    pub fn as_set_ref(&self) -> Option<&OrderedSet<Value>> {
+    pub fn as_set_ref(&self) -> Option<&OrderedSet<JsValue>> {
         match self.data {
             ObjectData::Set(ref set) => Some(set),
             _ => None,
@@ -372,7 +372,7 @@ impl Object {
     }
 
     #[inline]
-    pub fn as_set_mut(&mut self) -> Option<&mut OrderedSet<Value>> {
+    pub fn as_set_mut(&mut self) -> Option<&mut OrderedSet<JsValue>> {
         match &mut self.data {
             ObjectData::Set(set) => Some(set),
             _ => None,
@@ -506,7 +506,7 @@ impl Object {
     }
 
     #[inline]
-    pub fn prototype_instance(&self) -> &Value {
+    pub fn prototype_instance(&self) -> &JsValue {
         &self.prototype
     }
 
@@ -517,7 +517,7 @@ impl Object {
     /// [spec]: https://tc39.es/ecma262/#sec-invariants-of-the-essential-internal-methods
     #[inline]
     #[track_caller]
-    pub fn set_prototype_instance(&mut self, prototype: Value) -> bool {
+    pub fn set_prototype_instance(&mut self, prototype: JsValue) -> bool {
         assert!(prototype.is_null() || prototype.is_object());
         if self.extensible {
             self.prototype = prototype;
@@ -525,13 +525,13 @@ impl Object {
         } else {
             // If target is non-extensible, [[SetPrototypeOf]] must return false
             // unless V is the SameValue as the target's observed [[GetPrototypeOf]] value.
-            Value::same_value(&prototype, &self.prototype)
+            JsValue::same_value(&prototype, &self.prototype)
         }
     }
 
     /// Similar to `Value::new_object`, but you can pass a prototype to create from, plus a kind
     #[inline]
-    pub fn with_prototype(proto: Value, data: ObjectData) -> Object {
+    pub fn with_prototype(proto: JsValue, data: ObjectData) -> Object {
         let mut object = Object::new();
         object.data = data;
         object.set_prototype_instance(proto);
@@ -693,7 +693,7 @@ impl<'context> FunctionBuilder<'context> {
     #[inline]
     pub fn closure<F>(context: &'context mut Context, function: F) -> Self
     where
-        F: Fn(&Value, &[Value], &mut Context) -> Result<Value, Value> + 'static,
+        F: Fn(&JsValue, &[JsValue], &mut Context) -> Result<JsValue, JsValue> + 'static,
     {
         Self {
             context,
@@ -789,7 +789,7 @@ impl<'context> FunctionBuilder<'context> {
 /// # Examples
 ///
 /// ```
-/// # use boa::{Context, Value, object::ObjectInitializer, property::Attribute};
+/// # use boa::{Context, JsValue, object::ObjectInitializer, property::Attribute};
 /// let mut context = Context::new();
 /// let object = ObjectInitializer::new(&mut context)
 ///     .property(
@@ -802,7 +802,7 @@ impl<'context> FunctionBuilder<'context> {
 ///         1,
 ///         Attribute::all()
 ///     )
-///     .function(|_, _, _| Ok(Value::undefined()), "func", 0)
+///     .function(|_, _, _| Ok(JsValue::undefined()), "func", 0)
 ///     .build();
 /// ```
 ///
@@ -857,7 +857,7 @@ impl<'context> ObjectInitializer<'context> {
     pub fn property<K, V>(&mut self, key: K, value: V, attribute: Attribute) -> &mut Self
     where
         K: Into<PropertyKey>,
-        V: Into<Value>,
+        V: Into<JsValue>,
     {
         let property = PropertyDescriptor::builder()
             .value(value)
@@ -885,7 +885,7 @@ pub struct ConstructorBuilder<'context> {
     length: usize,
     callable: bool,
     constructable: bool,
-    inherit: Option<Value>,
+    inherit: Option<JsValue>,
 }
 
 impl Debug for ConstructorBuilder<'_> {
@@ -996,7 +996,7 @@ impl<'context> ConstructorBuilder<'context> {
     pub fn property<K, V>(&mut self, key: K, value: V, attribute: Attribute) -> &mut Self
     where
         K: Into<PropertyKey>,
-        V: Into<Value>,
+        V: Into<JsValue>,
     {
         let property = PropertyDescriptor::builder()
             .value(value)
@@ -1012,7 +1012,7 @@ impl<'context> ConstructorBuilder<'context> {
     pub fn static_property<K, V>(&mut self, key: K, value: V, attribute: Attribute) -> &mut Self
     where
         K: Into<PropertyKey>,
-        V: Into<Value>,
+        V: Into<JsValue>,
     {
         let property = PropertyDescriptor::builder()
             .value(value)
@@ -1132,7 +1132,7 @@ impl<'context> ConstructorBuilder<'context> {
     ///
     /// Default is `Object.prototype`
     #[inline]
-    pub fn inherit(&mut self, prototype: Value) -> &mut Self {
+    pub fn inherit(&mut self, prototype: JsValue) -> &mut Self {
         assert!(prototype.is_object() || prototype.is_null());
         self.inherit = Some(prototype);
         self

boa/src/property/mod.rs

@@ -16,7 +16,7 @@
 
 use crate::{
     gc::{Finalize, Trace},
-    JsString, JsSymbol, Value,
+    JsString, JsSymbol, JsValue,
 };
 use std::{convert::TryFrom, fmt};
 
@@ -55,12 +55,12 @@ pub struct PropertyDescriptor {
 #[derive(Debug, Clone, Trace, Finalize)]
 pub enum DescriptorKind {
     Data {
-        value: Option<Value>,
+        value: Option<JsValue>,
         writable: Option<bool>,
     },
     Accessor {
-        get: Option<Value>,
-        set: Option<Value>,
+        get: Option<JsValue>,
+        set: Option<JsValue>,
     },
     Generic,
 }
@@ -129,7 +129,7 @@ impl PropertyDescriptor {
     }
 
     #[inline]
-    pub fn value(&self) -> Option<&Value> {
+    pub fn value(&self) -> Option<&JsValue> {
         match &self.kind {
             DescriptorKind::Data { value, .. } => value.as_ref(),
             _ => None,
@@ -137,7 +137,7 @@ impl PropertyDescriptor {
     }
 
     #[inline]
-    pub fn get(&self) -> Option<&Value> {
+    pub fn get(&self) -> Option<&JsValue> {
         match &self.kind {
             DescriptorKind::Accessor { get, .. } => get.as_ref(),
             _ => None,
@@ -145,7 +145,7 @@ impl PropertyDescriptor {
     }
 
     #[inline]
-    pub fn set(&self) -> Option<&Value> {
+    pub fn set(&self) -> Option<&JsValue> {
         match &self.kind {
             DescriptorKind::Accessor { set, .. } => set.as_ref(),
             _ => None,
@@ -180,7 +180,7 @@ impl PropertyDescriptor {
     }
 
     #[inline]
-    pub fn expect_value(&self) -> &Value {
+    pub fn expect_value(&self) -> &JsValue {
         if let Some(value) = self.value() {
             value
         } else {
@@ -189,7 +189,7 @@ impl PropertyDescriptor {
     }
 
     #[inline]
-    pub fn expect_get(&self) -> &Value {
+    pub fn expect_get(&self) -> &JsValue {
         if let Some(get) = self.get() {
             get
         } else {
@@ -198,7 +198,7 @@ impl PropertyDescriptor {
     }
 
     #[inline]
-    pub fn expect_set(&self) -> &Value {
+    pub fn expect_set(&self) -> &JsValue {
         if let Some(set) = self.set() {
             set
         } else {
@@ -298,7 +298,7 @@ impl PropertyDescriptorBuilder {
         Self::default()
     }
 
-    pub fn value<V: Into<Value>>(mut self, value: V) -> Self {
+    pub fn value<V: Into<JsValue>>(mut self, value: V) -> Self {
         match self.inner.kind {
             DescriptorKind::Data {
                 value: ref mut v, ..
@@ -331,7 +331,7 @@ impl PropertyDescriptorBuilder {
         self
     }
 
-    pub fn get<V: Into<Value>>(mut self, get: V) -> Self {
+    pub fn get<V: Into<JsValue>>(mut self, get: V) -> Self {
         match self.inner.kind {
             DescriptorKind::Accessor { get: ref mut g, .. } => *g = Some(get.into()),
             // TODO: maybe panic when trying to convert data to accessor?
@@ -345,7 +345,7 @@ impl PropertyDescriptorBuilder {
         self
     }
 
-    pub fn set<V: Into<Value>>(mut self, set: V) -> Self {
+    pub fn set<V: Into<JsValue>>(mut self, set: V) -> Self {
         match self.inner.kind {
             DescriptorKind::Accessor { set: ref mut s, .. } => *s = Some(set.into()),
             // TODO: maybe panic when trying to convert data to accessor?
@@ -373,7 +373,7 @@ impl PropertyDescriptorBuilder {
         self
     }
 
-    pub fn maybe_value<V: Into<Value>>(mut self, value: Option<V>) -> Self {
+    pub fn maybe_value<V: Into<JsValue>>(mut self, value: Option<V>) -> Self {
         if let Some(value) = value {
             self = self.value(value);
         }
@@ -387,14 +387,14 @@ impl PropertyDescriptorBuilder {
         self
     }
 
-    pub fn maybe_get<V: Into<Value>>(mut self, get: Option<V>) -> Self {
+    pub fn maybe_get<V: Into<JsValue>>(mut self, get: Option<V>) -> Self {
         if let Some(get) = get {
             self = self.get(get);
         }
         self
     }
 
-    pub fn maybe_set<V: Into<Value>>(mut self, set: Option<V>) -> Self {
+    pub fn maybe_set<V: Into<JsValue>>(mut self, set: Option<V>) -> Self {
         if let Some(set) = set {
             self = self.set(set);
         }
@@ -414,7 +414,7 @@ impl PropertyDescriptorBuilder {
         match self.inner.kind {
             DescriptorKind::Generic => {
                 self.inner.kind = DescriptorKind::Data {
-                    value: Some(Value::undefined()),
+                    value: Some(JsValue::undefined()),
                     writable: Some(false),
                 }
             }
@@ -423,7 +423,7 @@ impl PropertyDescriptorBuilder {
                 ref mut writable,
             } => {
                 if value.is_none() {
-                    *value = Some(Value::undefined())
+                    *value = Some(JsValue::undefined())
                 }
                 if writable.is_none() {
                     *writable = Some(false)
@@ -434,10 +434,10 @@ impl PropertyDescriptorBuilder {
                 ref mut get,
             } => {
                 if set.is_none() {
-                    *set = Some(Value::undefined())
+                    *set = Some(JsValue::undefined())
                 }
                 if get.is_none() {
-                    *get = Some(Value::undefined())
+                    *get = Some(JsValue::undefined())
                 }
             }
         }
@@ -541,34 +541,34 @@ impl fmt::Display for PropertyKey {
     }
 }
 
-impl From<&PropertyKey> for Value {
+impl From<&PropertyKey> for JsValue {
     #[inline]
-    fn from(property_key: &PropertyKey) -> Value {
+    fn from(property_key: &PropertyKey) -> JsValue {
         match property_key {
             PropertyKey::String(ref string) => string.clone().into(),
             PropertyKey::Symbol(ref symbol) => symbol.clone().into(),
             PropertyKey::Index(index) => {
                 if let Ok(integer) = i32::try_from(*index) {
-                    Value::integer(integer)
+                    JsValue::new(integer)
                 } else {
-                    Value::number(*index)
+                    JsValue::new(*index)
                 }
             }
         }
     }
 }
 
-impl From<PropertyKey> for Value {
+impl From<PropertyKey> for JsValue {
     #[inline]
-    fn from(property_key: PropertyKey) -> Value {
+    fn from(property_key: PropertyKey) -> JsValue {
         match property_key {
             PropertyKey::String(ref string) => string.clone().into(),
             PropertyKey::Symbol(ref symbol) => symbol.clone().into(),
             PropertyKey::Index(index) => {
                 if let Ok(integer) = i32::try_from(index) {
-                    Value::integer(integer)
+                    JsValue::new(integer)
                 } else {
-                    Value::number(index)
+                    JsValue::new(index)
                 }
             }
         }

boa/src/syntax/ast/node/array/mod.rs

@@ -5,7 +5,7 @@ use crate::{
     builtins::{iterable, Array},
     exec::Executable,
     gc::{Finalize, Trace},
-    BoaProfiler, Context, Result, Value,
+    BoaProfiler, Context, JsValue, Result,
 };
 use std::fmt;
 
@@ -39,7 +39,7 @@ pub struct ArrayDecl {
 }
 
 impl Executable for ArrayDecl {
-    fn run(&self, context: &mut Context) -> Result<Value> {
+    fn run(&self, context: &mut Context) -> Result<JsValue> {
         let _timer = BoaProfiler::global().start_event("ArrayDecl", "exec");
         let array = Array::new_array(context);
         let mut elements = Vec::new();

boa/src/syntax/ast/node/await_expr/mod.rs

@@ -1,7 +1,7 @@
 //! Await expression node.
 
 use super::Node;
-use crate::{exec::Executable, BoaProfiler, Context, Result, Value};
+use crate::{exec::Executable, BoaProfiler, Context, JsValue, Result};
 use gc::{Finalize, Trace};
 use std::fmt;
 
@@ -27,10 +27,10 @@ pub struct AwaitExpr {
 }
 
 impl Executable for AwaitExpr {
-    fn run(&self, _: &mut Context) -> Result<Value> {
+    fn run(&self, _: &mut Context) -> Result<JsValue> {
         let _timer = BoaProfiler::global().start_event("AwaitExpression", "exec");
         // TODO: Implement AwaitExpr
-        Ok(Value::Undefined)
+        Ok(JsValue::undefined())
     }
 }
 

boa/src/syntax/ast/node/block/mod.rs

@@ -6,7 +6,7 @@ use crate::{
     exec::Executable,
     exec::InterpreterState,
     gc::{Finalize, Trace},
-    BoaProfiler, Context, Result, Value,
+    BoaProfiler, Context, JsValue, Result,
 };
 use std::fmt;
 
@@ -54,7 +54,7 @@ impl Block {
 }
 
 impl Executable for Block {
-    fn run(&self, context: &mut Context) -> Result<Value> {
+    fn run(&self, context: &mut Context) -> Result<JsValue> {
         let _timer = BoaProfiler::global().start_event("Block", "exec");
         {
             let env = context.get_current_environment();
@@ -63,7 +63,7 @@ impl Executable for Block {
 
         // https://tc39.es/ecma262/#sec-block-runtime-semantics-evaluation
         // The return value is uninitialized, which means it defaults to Value::Undefined
-        let mut obj = Value::default();
+        let mut obj = JsValue::default();
         for statement in self.items() {
             obj = statement.run(context).map_err(|e| {
                 // No matter how control leaves the Block the LexicalEnvironment is always

boa/src/syntax/ast/node/break_node/mod.rs

@@ -3,7 +3,7 @@ use crate::{
     exec::Executable,
     exec::InterpreterState,
     gc::{Finalize, Trace},
-    Context, Result, Value,
+    Context, JsValue, Result,
 };
 use std::fmt;
 
@@ -52,12 +52,12 @@ impl Break {
 }
 
 impl Executable for Break {
-    fn run(&self, context: &mut Context) -> Result<Value> {
+    fn run(&self, context: &mut Context) -> Result<JsValue> {
         context
             .executor()
             .set_current_state(InterpreterState::Break(self.label().map(Box::from)));
 
-        Ok(Value::undefined())
+        Ok(JsValue::undefined())
     }
 }
 

boa/src/syntax/ast/node/call/mod.rs

@@ -4,8 +4,7 @@ use crate::{
     exec::InterpreterState,
     gc::{Finalize, Trace},
     syntax::ast::node::{join_nodes, Node},
-    value::Value,
-    BoaProfiler, Context, Result,
+    BoaProfiler, Context, JsValue, Result,
 };
 use std::fmt;
 
@@ -61,13 +60,13 @@ impl Call {
 }
 
 impl Executable for Call {
-    fn run(&self, context: &mut Context) -> Result<Value> {
+    fn run(&self, context: &mut Context) -> Result<JsValue> {
         let _timer = BoaProfiler::global().start_event("Call", "exec");
         let (this, func) = match self.expr() {
             Node::GetConstField(ref get_const_field) => {
                 let mut obj = get_const_field.obj().run(context)?;
                 if !obj.is_object() {
-                    obj = Value::Object(obj.to_object(context)?);
+                    obj = JsValue::Object(obj.to_object(context)?);
                 }
                 (
                     obj.clone(),
@@ -77,7 +76,7 @@ impl Executable for Call {
             Node::GetField(ref get_field) => {
                 let mut obj = get_field.obj().run(context)?;
                 if !obj.is_object() {
-                    obj = Value::Object(obj.to_object(context)?);
+                    obj = JsValue::Object(obj.to_object(context)?);
                 }
                 let field = get_field.field().run(context)?;
                 (

boa/src/syntax/ast/node/conditional/conditional_op/mod.rs

@@ -2,7 +2,7 @@ use crate::{
     exec::Executable,
     gc::{Finalize, Trace},
     syntax::ast::node::Node,
-    Context, Result, Value,
+    Context, JsValue, Result,
 };
 use std::fmt;
 
@@ -60,7 +60,7 @@ impl ConditionalOp {
 }
 
 impl Executable for ConditionalOp {
-    fn run(&self, context: &mut Context) -> Result<Value> {
+    fn run(&self, context: &mut Context) -> Result<JsValue> {
         Ok(if self.cond().run(context)?.to_boolean() {
             self.if_true().run(context)?
         } else {

boa/src/syntax/ast/node/conditional/if_node/mod.rs

@@ -2,7 +2,7 @@ use crate::{
     exec::Executable,
     gc::{Finalize, Trace},
     syntax::ast::node::Node,
-    Context, Result, Value,
+    Context, JsValue, Result,
 };
 use std::fmt;
 
@@ -79,13 +79,13 @@ impl If {
 }
 
 impl Executable for If {
-    fn run(&self, context: &mut Context) -> Result<Value> {
+    fn run(&self, context: &mut Context) -> Result<JsValue> {
         Ok(if self.cond().run(context)?.to_boolean() {
             self.body().run(context)?
         } else if let Some(else_e) = self.else_node() {
             else_e.run(context)?
         } else {
-            Value::undefined()
+            JsValue::undefined()
         })
     }
 }

boa/src/syntax/ast/node/declaration/arrow_function_decl/mod.rs

@@ -3,7 +3,7 @@ use crate::{
     exec::Executable,
     gc::{Finalize, Trace},
     syntax::ast::node::{join_nodes, FormalParameter, Node, StatementList},
-    Context, Result, Value,
+    Context, JsValue, Result,
 };
 use std::fmt;
 
@@ -72,7 +72,7 @@ impl ArrowFunctionDecl {
 }
 
 impl Executable for ArrowFunctionDecl {
-    fn run(&self, context: &mut Context) -> Result<Value> {
+    fn run(&self, context: &mut Context) -> Result<JsValue> {
         context.create_function(
             "",
             self.params().to_vec(),

boa/src/syntax/ast/node/declaration/async_function_decl/mod.rs

@@ -3,7 +3,7 @@
 use crate::{
     exec::Executable,
     syntax::ast::node::{join_nodes, FormalParameter, Node, StatementList},
-    BoaProfiler, Context, Result, Value,
+    BoaProfiler, Context, JsValue, Result,
 };
 use gc::{Finalize, Trace};
 use std::fmt;
@@ -79,10 +79,10 @@ impl AsyncFunctionDecl {
 }
 
 impl Executable for AsyncFunctionDecl {
-    fn run(&self, _: &mut Context) -> Result<Value> {
+    fn run(&self, _: &mut Context) -> Result<JsValue> {
         let _timer = BoaProfiler::global().start_event("AsyncFunctionDecl", "exec");
         // TODO: Implement AsyncFunctionDecl
-        Ok(Value::undefined())
+        Ok(JsValue::undefined())
     }
 }
 

boa/src/syntax/ast/node/declaration/async_function_expr/mod.rs

@@ -3,7 +3,7 @@
 use crate::{
     exec::Executable,
     syntax::ast::node::{join_nodes, FormalParameter, Node, StatementList},
-    Context, Result, Value,
+    Context, JsValue, Result,
 };
 use gc::{Finalize, Trace};
 use std::fmt;
@@ -81,9 +81,9 @@ impl AsyncFunctionExpr {
 }
 
 impl Executable for AsyncFunctionExpr {
-    fn run(&self, _: &mut Context) -> Result<Value> {
+    fn run(&self, _: &mut Context) -> Result<JsValue> {
         // TODO: Implement AsyncFunctionExpr
-        Ok(Value::Undefined)
+        Ok(JsValue::undefined())
     }
 }
 

boa/src/syntax/ast/node/declaration/function_decl/mod.rs

@@ -4,7 +4,7 @@ use crate::{
     exec::Executable,
     gc::{Finalize, Trace},
     syntax::ast::node::{join_nodes, FormalParameter, Node, StatementList},
-    BoaProfiler, Context, Result, Value,
+    BoaProfiler, Context, JsValue, Result,
 };
 use std::fmt;
 
@@ -86,7 +86,7 @@ impl FunctionDecl {
 }
 
 impl Executable for FunctionDecl {
-    fn run(&self, context: &mut Context) -> Result<Value> {
+    fn run(&self, context: &mut Context) -> Result<JsValue> {
         let _timer = BoaProfiler::global().start_event("FunctionDecl", "exec");
         let val = context.create_function(
             self.name(),
@@ -106,7 +106,7 @@ impl Executable for FunctionDecl {
 
             context.initialize_binding(self.name(), val)?;
         }
-        Ok(Value::undefined())
+        Ok(JsValue::undefined())
     }
 }
 

boa/src/syntax/ast/node/declaration/function_expr/mod.rs

@@ -3,7 +3,7 @@ use crate::{
     exec::Executable,
     gc::{Finalize, Trace},
     syntax::ast::node::{join_nodes, FormalParameter, Node, StatementList},
-    Context, Result, Value,
+    Context, JsValue, Result,
 };
 use std::fmt;
 
@@ -98,7 +98,7 @@ impl FunctionExpr {
 }
 
 impl Executable for FunctionExpr {
-    fn run(&self, context: &mut Context) -> Result<Value> {
+    fn run(&self, context: &mut Context) -> Result<JsValue> {
         let val = context.create_function(
             self.name().unwrap_or(""),
             self.parameters().to_vec(),

boa/src/syntax/ast/node/declaration/mod.rs

@@ -4,7 +4,7 @@ use crate::{
     exec::Executable,
     gc::{Finalize, Trace},
     syntax::ast::node::{join_nodes, Identifier, Node},
-    Context, Result, Value,
+    Context, JsValue, Result,
 };
 use std::fmt;
 
@@ -90,7 +90,7 @@ pub enum DeclarationList {
 }
 
 impl Executable for DeclarationList {
-    fn run(&self, context: &mut Context) -> Result<Value> {
+    fn run(&self, context: &mut Context) -> Result<JsValue> {
         for decl in self.as_ref() {
             use DeclarationList::*;
             let val = match decl.init() {
@@ -98,7 +98,7 @@ impl Executable for DeclarationList {
                     return context.throw_syntax_error("missing = in const declaration")
                 }
                 Some(init) => init.run(context)?,
-                None => Value::undefined(),
+                None => JsValue::undefined(),
             };
 
             if self.is_var() && context.has_binding(decl.name()) {
@@ -129,7 +129,7 @@ impl Executable for DeclarationList {
             context.initialize_binding(decl.name(), val)?;
         }
 
-        Ok(Value::undefined())
+        Ok(JsValue::undefined())
     }
 }
 

boa/src/syntax/ast/node/field/get_const_field/mod.rs

@@ -2,8 +2,7 @@ use crate::{
     exec::Executable,
     gc::{Finalize, Trace},
     syntax::ast::node::Node,
-    value::Value,
-    Context, Result,
+    Context, JsValue, Result,
 };
 use std::fmt;
 
@@ -63,10 +62,10 @@ impl GetConstField {
 }
 
 impl Executable for GetConstField {
-    fn run(&self, context: &mut Context) -> Result<Value> {
+    fn run(&self, context: &mut Context) -> Result<JsValue> {
         let mut obj = self.obj().run(context)?;
         if !obj.is_object() {
-            obj = Value::Object(obj.to_object(context)?);
+            obj = JsValue::Object(obj.to_object(context)?);
         }
 
         obj.get_field(self.field(), context)

boa/src/syntax/ast/node/field/get_field/mod.rs

@@ -2,8 +2,7 @@ use crate::{
     exec::Executable,
     gc::{Finalize, Trace},
     syntax::ast::node::Node,
-    value::Value,
-    Context, Result,
+    Context, JsValue, Result,
 };
 use std::fmt;
 
@@ -62,10 +61,10 @@ impl GetField {
 }
 
 impl Executable for GetField {
-    fn run(&self, context: &mut Context) -> Result<Value> {
+    fn run(&self, context: &mut Context) -> Result<JsValue> {
         let mut obj = self.obj().run(context)?;
         if !obj.is_object() {
-            obj = Value::Object(obj.to_object(context)?);
+            obj = JsValue::Object(obj.to_object(context)?);
         }
         let field = self.field().run(context)?;
 

boa/src/syntax/ast/node/identifier/mod.rs

@@ -4,7 +4,7 @@ use crate::{
     exec::Executable,
     gc::{Finalize, Trace},
     syntax::ast::node::Node,
-    BoaProfiler, Context, Result, Value,
+    BoaProfiler, Context, JsValue, Result,
 };
 use std::fmt;
 
@@ -34,7 +34,7 @@ pub struct Identifier {
 }
 
 impl Executable for Identifier {
-    fn run(&self, context: &mut Context) -> Result<Value> {
+    fn run(&self, context: &mut Context) -> Result<JsValue> {
         let _timer = BoaProfiler::global().start_event("Identifier", "exec");
         context.get_binding_value(self.as_ref())
     }

boa/src/syntax/ast/node/iteration/continue_node/mod.rs

@@ -2,7 +2,7 @@ use crate::{
     exec::{Executable, InterpreterState},
     gc::{Finalize, Trace},
     syntax::ast::node::Node,
-    Context, Result, Value,
+    Context, JsValue, Result,
 };
 use std::fmt;
 
@@ -46,12 +46,12 @@ impl Continue {
 }
 
 impl Executable for Continue {
-    fn run(&self, context: &mut Context) -> Result<Value> {
+    fn run(&self, context: &mut Context) -> Result<JsValue> {
         context
             .executor()
             .set_current_state(InterpreterState::Continue(self.label().map(Box::from)));
 
-        Ok(Value::undefined())
+        Ok(JsValue::undefined())
     }
 }
 

boa/src/syntax/ast/node/iteration/do_while_loop/mod.rs

@@ -2,7 +2,7 @@ use crate::{
     exec::{Executable, InterpreterState},
     gc::{Finalize, Trace},
     syntax::ast::node::Node,
-    Context, Result, Value,
+    Context, JsValue, Result,
 };
 use std::fmt;
 
@@ -74,7 +74,7 @@ impl DoWhileLoop {
 }
 
 impl Executable for DoWhileLoop {
-    fn run(&self, context: &mut Context) -> Result<Value> {
+    fn run(&self, context: &mut Context) -> Result<JsValue> {
         let mut result;
         loop {
             result = self.body().run(context)?;

boa/src/syntax/ast/node/iteration/for_in_loop/mod.rs

@@ -7,7 +7,7 @@ use crate::{
     exec::{Executable, InterpreterState},
     gc::{Finalize, Trace},
     syntax::ast::node::Node,
-    BoaProfiler, Context, Result, Value,
+    BoaProfiler, Context, JsValue, Result,
 };
 use std::fmt;
 
@@ -80,16 +80,16 @@ impl From<ForInLoop> for Node {
 }
 
 impl Executable for ForInLoop {
-    fn run(&self, context: &mut Context) -> Result<Value> {
+    fn run(&self, context: &mut Context) -> Result<JsValue> {
         let _timer = BoaProfiler::global().start_event("ForIn", "exec");
         let object = self.expr().run(context)?;
-        let mut result = Value::undefined();
+        let mut result = JsValue::undefined();
 
         if object.is_null_or_undefined() {
             return Ok(result);
         }
         let object = object.to_object(context)?;
-        let for_in_iterator = ForInIterator::create_for_in_iterator(context, Value::from(object));
+        let for_in_iterator = ForInIterator::create_for_in_iterator(context, JsValue::new(object));
         let next_function = for_in_iterator
             .get_property("next")
             .as_ref()

boa/src/syntax/ast/node/iteration/for_loop/mod.rs

@@ -3,7 +3,7 @@ use crate::{
     exec::{Executable, InterpreterState},
     gc::{Finalize, Trace},
     syntax::ast::node::Node,
-    BoaProfiler, Context, Result, Value,
+    BoaProfiler, Context, JsValue, Result,
 };
 use std::fmt;
 
@@ -98,7 +98,7 @@ impl ForLoop {
 }
 
 impl Executable for ForLoop {
-    fn run(&self, context: &mut Context) -> Result<Value> {
+    fn run(&self, context: &mut Context) -> Result<JsValue> {
         // Create the block environment.
         let _timer = BoaProfiler::global().start_event("ForLoop", "exec");
         {
@@ -143,7 +143,7 @@ impl Executable for ForLoop {
         // pop the block env
         let _ = context.pop_environment();
 
-        Ok(Value::undefined())
+        Ok(JsValue::undefined())
     }
 }
 

boa/src/syntax/ast/node/iteration/for_of_loop/mod.rs

@@ -7,7 +7,7 @@ use crate::{
     exec::{Executable, InterpreterState},
     gc::{Finalize, Trace},
     syntax::ast::node::Node,
-    BoaProfiler, Context, Result, Value,
+    BoaProfiler, Context, JsValue, Result,
 };
 use std::fmt;
 
@@ -80,11 +80,11 @@ impl From<ForOfLoop> for Node {
 }
 
 impl Executable for ForOfLoop {
-    fn run(&self, context: &mut Context) -> Result<Value> {
+    fn run(&self, context: &mut Context) -> Result<JsValue> {
         let _timer = BoaProfiler::global().start_event("ForOf", "exec");
         let iterable = self.iterable().run(context)?;
         let iterator = get_iterator(context, iterable)?;
-        let mut result = Value::undefined();
+        let mut result = JsValue::undefined();
 
         loop {
             {

boa/src/syntax/ast/node/iteration/while_loop/mod.rs

@@ -2,7 +2,7 @@ use crate::{
     exec::{Executable, InterpreterState},
     gc::{Finalize, Trace},
     syntax::ast::node::Node,
-    Context, Result, Value,
+    Context, JsValue, Result,
 };
 use std::fmt;
 
@@ -72,8 +72,8 @@ impl WhileLoop {
 }
 
 impl Executable for WhileLoop {
-    fn run(&self, context: &mut Context) -> Result<Value> {
-        let mut result = Value::undefined();
+    fn run(&self, context: &mut Context) -> Result<JsValue> {
+        let mut result = JsValue::undefined();
         while self.cond().run(context)?.to_boolean() {
             result = self.body().run(context)?;
             match context.executor().get_current_state() {

boa/src/syntax/ast/node/mod.rs

@@ -50,7 +50,7 @@ use super::Const;
 use crate::{
     exec::Executable,
     gc::{empty_trace, Finalize, Trace},
-    BoaProfiler, Context, Result, Value,
+    BoaProfiler, Context, JsValue, Result,
 };
 use std::{
     cmp::Ordering,
@@ -307,23 +307,23 @@ impl Node {
 }
 
 impl Executable for Node {
-    fn run(&self, context: &mut Context) -> Result<Value> {
+    fn run(&self, context: &mut Context) -> Result<JsValue> {
         let _timer = BoaProfiler::global().start_event("Executable", "exec");
         match *self {
             Node::AsyncFunctionDecl(ref decl) => decl.run(context),
             Node::AsyncFunctionExpr(ref function_expr) => function_expr.run(context),
             Node::AwaitExpr(ref expr) => expr.run(context),
             Node::Call(ref call) => call.run(context),
-            Node::Const(Const::Null) => Ok(Value::null()),
-            Node::Const(Const::Num(num)) => Ok(Value::rational(num)),
-            Node::Const(Const::Int(num)) => Ok(Value::integer(num)),
-            Node::Const(Const::BigInt(ref num)) => Ok(Value::from(num.clone())),
-            Node::Const(Const::Undefined) => Ok(Value::Undefined),
+            Node::Const(Const::Null) => Ok(JsValue::null()),
+            Node::Const(Const::Num(num)) => Ok(JsValue::new(num)),
+            Node::Const(Const::Int(num)) => Ok(JsValue::new(num)),
+            Node::Const(Const::BigInt(ref num)) => Ok(JsValue::new(num.clone())),
+            Node::Const(Const::Undefined) => Ok(JsValue::undefined()),
             // we can't move String from Const into value, because const is a garbage collected value
             // Which means Drop() get's called on Const, but str will be gone at that point.
             // Do Const values need to be garbage collected? We no longer need them once we've generated Values
-            Node::Const(Const::String(ref value)) => Ok(Value::string(value.to_string())),
-            Node::Const(Const::Bool(value)) => Ok(Value::boolean(value)),
+            Node::Const(Const::String(ref value)) => Ok(JsValue::new(value.to_string())),
+            Node::Const(Const::Bool(value)) => Ok(JsValue::new(value)),
             Node::Block(ref block) => block.run(context),
             Node::Identifier(ref identifier) => identifier.run(context),
             Node::GetConstField(ref get_const_field_node) => get_const_field_node.run(context),
@@ -362,7 +362,7 @@ impl Executable for Node {
             Node::Try(ref try_node) => try_node.run(context),
             Node::Break(ref break_node) => break_node.run(context),
             Node::Continue(ref continue_node) => continue_node.run(context),
-            Node::Empty => Ok(Value::Undefined),
+            Node::Empty => Ok(JsValue::undefined()),
         }
     }
 }

boa/src/syntax/ast/node/new/mod.rs

@@ -3,7 +3,7 @@ use crate::{
     exec::Executable,
     gc::{Finalize, Trace},
     syntax::ast::node::{Call, Node},
-    value::Value,
+    value::JsValue,
     BoaProfiler, Context, Result,
 };
 use std::fmt;
@@ -48,7 +48,7 @@ impl New {
 }
 
 impl Executable for New {
-    fn run(&self, context: &mut Context) -> Result<Value> {
+    fn run(&self, context: &mut Context) -> Result<JsValue> {
         let _timer = BoaProfiler::global().start_event("New", "exec");
 
         let func_object = self.expr().run(context)?;
@@ -72,7 +72,9 @@ impl Executable for New {
         }
 
         match func_object {
-            Value::Object(ref object) => object.construct(&v_args, &object.clone().into(), context),
+            JsValue::Object(ref object) => {
+                object.construct(&v_args, &object.clone().into(), context)
+            }
             _ => context
                 .throw_type_error(format!("{} is not a constructor", self.expr().to_string(),)),
         }

boa/src/syntax/ast/node/object/mod.rs

@@ -5,7 +5,7 @@ use crate::{
     gc::{Finalize, Trace},
     property::PropertyDescriptor,
     syntax::ast::node::{join_nodes, MethodDefinitionKind, Node, PropertyDefinition},
-    BoaProfiler, Context, Result, Value,
+    BoaProfiler, Context, JsValue, Result,
 };
 use std::fmt;
 
@@ -87,9 +87,9 @@ impl Object {
 }
 
 impl Executable for Object {
-    fn run(&self, context: &mut Context) -> Result<Value> {
+    fn run(&self, context: &mut Context) -> Result<JsValue> {
         let _timer = BoaProfiler::global().start_event("object", "exec");
-        let obj = Value::new_object(context);
+        let obj = JsValue::new_object(context);
 
         // TODO: Implement the rest of the property types.
         for property in self.properties().iter() {

boa/src/syntax/ast/node/operator/assign/mod.rs

@@ -3,7 +3,7 @@ use crate::{
     exec::Executable,
     gc::{Finalize, Trace},
     syntax::ast::node::Node,
-    BoaProfiler, Context, Result, Value,
+    BoaProfiler, Context, JsValue, Result,
 };
 use std::fmt;
 
@@ -53,7 +53,7 @@ impl Assign {
 }
 
 impl Executable for Assign {
-    fn run(&self, context: &mut Context) -> Result<Value> {
+    fn run(&self, context: &mut Context) -> Result<JsValue> {
         let _timer = BoaProfiler::global().start_event("Assign", "exec");
         let val = self.rhs().run(context)?;
         match self.lhs() {

boa/src/syntax/ast/node/operator/bin_op/mod.rs

@@ -6,7 +6,7 @@ use crate::{
         node::Node,
         op::{self, AssignOp, BitOp, CompOp, LogOp, NumOp},
     },
-    Context, Result, Value,
+    Context, JsValue, Result,
 };
 use std::fmt;
 
@@ -58,7 +58,7 @@ impl BinOp {
     }
 
     /// Runs the assignment operators.
-    fn run_assign(op: AssignOp, x: Value, y: &Node, context: &mut Context) -> Result<Value> {
+    fn run_assign(op: AssignOp, x: JsValue, y: &Node, context: &mut Context) -> Result<JsValue> {
         match op {
             AssignOp::Add => x.add(&y.run(context)?, context),
             AssignOp::Sub => x.sub(&y.run(context)?, context),
@@ -98,7 +98,7 @@ impl BinOp {
 }
 
 impl Executable for BinOp {
-    fn run(&self, context: &mut Context) -> Result<Value> {
+    fn run(&self, context: &mut Context) -> Result<JsValue> {
         match self.op() {
             op::BinOp::Num(op) => {
                 let x = self.lhs().run(context)?;
@@ -127,7 +127,7 @@ impl Executable for BinOp {
             op::BinOp::Comp(op) => {
                 let x = self.lhs().run(context)?;
                 let y = self.rhs().run(context)?;
-                Ok(Value::from(match op {
+                Ok(JsValue::new(match op {
                     CompOp::Equal => x.equals(&y, context)?,
                     CompOp::NotEqual => !x.equals(&y, context)?,
                     CompOp::StrictEqual => x.strict_equals(&y),
@@ -213,7 +213,7 @@ impl Executable for BinOp {
                     v_r_a.set_field(get_const_field.field(), value.clone(), false, context)?;
                     Ok(value)
                 }
-                _ => Ok(Value::undefined()),
+                _ => Ok(JsValue::undefined()),
             },
             op::BinOp::Comma => {
                 self.lhs().run(context)?;

boa/src/syntax/ast/node/operator/unary_op/mod.rs

@@ -2,7 +2,7 @@ use crate::{
     exec::Executable,
     gc::{Finalize, Trace},
     syntax::ast::{node::Node, op},
-    Context, JsBigInt, Result, Value,
+    Context, JsBigInt, JsValue, Result,
 };
 use std::fmt;
 
@@ -50,10 +50,10 @@ impl UnaryOp {
 }
 
 impl Executable for UnaryOp {
-    fn run(&self, context: &mut Context) -> Result<Value> {
+    fn run(&self, context: &mut Context) -> Result<JsValue> {
         Ok(match self.op() {
             op::UnaryOp::Minus => self.target().run(context)?.neg(context)?,
-            op::UnaryOp::Plus => Value::from(self.target().run(context)?.to_number(context)?),
+            op::UnaryOp::Plus => JsValue::new(self.target().run(context)?.to_number(context)?),
             op::UnaryOp::IncrementPost => {
                 let x = self.target().run(context)?;
                 let ret = x.clone();
@@ -81,16 +81,16 @@ impl Executable for UnaryOp {
                 let expr = self.target().run(context)?;
                 let old_v = expr.to_numeric(context)?;
                 match old_v {
-                    Numeric::Number(x) => Value::from(Number::not(x)),
-                    Numeric::BigInt(x) => Value::from(JsBigInt::not(&x)),
+                    Numeric::Number(x) => JsValue::new(Number::not(x)),
+                    Numeric::BigInt(x) => JsValue::new(JsBigInt::not(&x)),
                 }
             }
             op::UnaryOp::Void => {
                 self.target().run(context)?;
-                Value::undefined()
+                JsValue::undefined()
             }
             op::UnaryOp::Delete => match *self.target() {
-                Node::GetConstField(ref get_const_field) => Value::boolean(
+                Node::GetConstField(ref get_const_field) => JsValue::new(
                     get_const_field
                         .obj()
                         .run(context)?
@@ -103,9 +103,9 @@ impl Executable for UnaryOp {
                     let res = obj
                         .to_object(context)?
                         .__delete__(&field.to_property_key(context)?);
-                    return Ok(Value::boolean(res));
+                    return Ok(JsValue::new(res));
                 }
-                Node::Identifier(_) => Value::boolean(false),
+                Node::Identifier(_) => JsValue::new(false),
                 Node::ArrayDecl(_)
                 | Node::Block(_)
                 | Node::Const(_)
@@ -113,10 +113,10 @@ impl Executable for UnaryOp {
                 | Node::FunctionExpr(_)
                 | Node::New(_)
                 | Node::Object(_)
-                | Node::UnaryOp(_) => Value::boolean(true),
+                | Node::UnaryOp(_) => JsValue::new(true),
                 _ => return context.throw_syntax_error(format!("wrong delete argument {}", self)),
             },
-            op::UnaryOp::TypeOf => Value::from(self.target().run(context)?.type_of()),
+            op::UnaryOp::TypeOf => JsValue::new(self.target().run(context)?.type_of()),
         })
     }
 }

boa/src/syntax/ast/node/return_smt/mod.rs

@@ -2,7 +2,7 @@ use crate::{
     exec::{Executable, InterpreterState},
     gc::{Finalize, Trace},
     syntax::ast::node::Node,
-    Context, Result, Value,
+    Context, JsValue, Result,
 };
 use std::fmt;
 
@@ -61,10 +61,10 @@ impl Return {
 }
 
 impl Executable for Return {
-    fn run(&self, context: &mut Context) -> Result<Value> {
+    fn run(&self, context: &mut Context) -> Result<JsValue> {
         let result = match self.expr() {
             Some(v) => v.run(context),
-            None => Ok(Value::undefined()),
+            None => Ok(JsValue::undefined()),
         };
         // Set flag for return
         context

boa/src/syntax/ast/node/spread/mod.rs

@@ -2,7 +2,7 @@ use crate::{
     exec::Executable,
     gc::{Finalize, Trace},
     syntax::ast::node::Node,
-    Context, Result, Value,
+    Context, JsValue, Result,
 };
 use std::fmt;
 
@@ -52,7 +52,7 @@ impl Spread {
 }
 
 impl Executable for Spread {
-    fn run(&self, context: &mut Context) -> Result<Value> {
+    fn run(&self, context: &mut Context) -> Result<JsValue> {
         // TODO: for now we can do nothing but return the value as-is
         self.val().run(context)
     }

boa/src/syntax/ast/node/statement_list/mod.rs

@@ -4,7 +4,7 @@ use crate::{
     exec::{Executable, InterpreterState},
     gc::{empty_trace, Finalize, Trace},
     syntax::ast::node::Node,
-    BoaProfiler, Context, Result, Value,
+    BoaProfiler, Context, JsValue, Result,
 };
 use std::{collections::HashSet, fmt, ops::Deref, rc::Rc};
 
@@ -92,12 +92,12 @@ impl StatementList {
 }
 
 impl Executable for StatementList {
-    fn run(&self, context: &mut Context) -> Result<Value> {
+    fn run(&self, context: &mut Context) -> Result<JsValue> {
         let _timer = BoaProfiler::global().start_event("StatementList", "exec");
 
         // https://tc39.es/ecma262/#sec-block-runtime-semantics-evaluation
         // The return value is uninitialized, which means it defaults to Value::Undefined
-        let mut obj = Value::default();
+        let mut obj = JsValue::default();
         context
             .executor()
             .set_current_state(InterpreterState::Executing);

boa/src/syntax/ast/node/switch/mod.rs

@@ -4,7 +4,7 @@ use crate::{
     exec::{Executable, InterpreterState},
     gc::{Finalize, Trace},
     syntax::ast::node::Node,
-    Context, Result, Value,
+    Context, JsValue, Result,
 };
 use std::fmt;
 
@@ -123,9 +123,9 @@ impl Switch {
 }
 
 impl Executable for Switch {
-    fn run(&self, context: &mut Context) -> Result<Value> {
+    fn run(&self, context: &mut Context) -> Result<JsValue> {
         let val = self.val().run(context)?;
-        let mut result = Value::null();
+        let mut result = JsValue::null();
         let mut matched = false;
         context
             .executor()

boa/src/syntax/ast/node/template/mod.rs

@@ -1,7 +1,7 @@
 //! Template literal node.
 
 use super::Node;
-use crate::{builtins::Array, exec::Executable, BoaProfiler, Context, Result, Value};
+use crate::{builtins::Array, exec::Executable, BoaProfiler, Context, JsValue, Result};
 use gc::{Finalize, Trace};
 
 #[cfg(feature = "deser")]
@@ -32,7 +32,7 @@ impl TemplateLit {
 }
 
 impl Executable for TemplateLit {
-    fn run(&self, context: &mut Context) -> Result<Value> {
+    fn run(&self, context: &mut Context) -> Result<JsValue> {
         let _timer = BoaProfiler::global().start_event("TemplateLiteral", "exec");
         let mut result = String::new();
 
@@ -90,21 +90,21 @@ impl TaggedTemplate {
 }
 
 impl Executable for TaggedTemplate {
-    fn run(&self, context: &mut Context) -> Result<Value> {
+    fn run(&self, context: &mut Context) -> Result<JsValue> {
         let _timer = BoaProfiler::global().start_event("TaggedTemplate", "exec");
 
         let template_object = Array::new_array(context);
         let raw_array = Array::new_array(context);
 
         for (i, raw) in self.raws.iter().enumerate() {
-            raw_array.set_field(i, Value::from(raw), false, context)?;
+            raw_array.set_field(i, JsValue::new(raw.as_ref()), false, context)?;
         }
 
         for (i, cooked) in self.cookeds.iter().enumerate() {
             if let Some(cooked) = cooked {
-                template_object.set_field(i, Value::from(cooked), false, context)?;
+                template_object.set_field(i, JsValue::new(cooked.as_ref()), false, context)?;
             } else {
-                template_object.set_field(i, Value::undefined(), false, context)?;
+                template_object.set_field(i, JsValue::undefined(), false, context)?;
             }
         }
         template_object.set_field("raw", raw_array, false, context)?;
@@ -113,7 +113,7 @@ impl Executable for TaggedTemplate {
             Node::GetConstField(ref get_const_field) => {
                 let mut obj = get_const_field.obj().run(context)?;
                 if !obj.is_object() {
-                    obj = Value::Object(obj.to_object(context)?);
+                    obj = JsValue::Object(obj.to_object(context)?);
                 }
                 (
                     obj.clone(),

boa/src/syntax/ast/node/throw/mod.rs

@@ -2,7 +2,7 @@ use crate::{
     exec::Executable,
     gc::{Finalize, Trace},
     syntax::ast::node::Node,
-    Context, Result, Value,
+    Context, JsValue, Result,
 };
 use std::fmt;
 
@@ -50,7 +50,7 @@ impl Throw {
 
 impl Executable for Throw {
     #[inline]
-    fn run(&self, context: &mut Context) -> Result<Value> {
+    fn run(&self, context: &mut Context) -> Result<JsValue> {
         Err(self.expr().run(context)?)
     }
 }

boa/src/syntax/ast/node/try_node/mod.rs

@@ -6,7 +6,7 @@ use crate::{
     exec::Executable,
     gc::{Finalize, Trace},
     syntax::ast::node::{Block, Identifier, Node},
-    BoaProfiler, Context, Result, Value,
+    BoaProfiler, Context, JsValue, Result,
 };
 use std::fmt;
 
@@ -95,7 +95,7 @@ impl Try {
 }
 
 impl Executable for Try {
-    fn run(&self, context: &mut Context) -> Result<Value> {
+    fn run(&self, context: &mut Context) -> Result<JsValue> {
         let _timer = BoaProfiler::global().start_event("Try", "exec");
         let res = self.block().run(context).map_or_else(
             |err| {

boa/src/value/conversions.rs

@@ -1,60 +1,36 @@
 use super::*;
 use std::convert::TryFrom;
 
-impl From<&Value> for Value {
+impl From<&JsValue> for JsValue {
     #[inline]
-    fn from(value: &Value) -> Self {
+    fn from(value: &JsValue) -> Self {
         value.clone()
     }
 }
 
-impl From<String> for Value {
+impl<T> From<T> for JsValue
+where
+    T: Into<JsString>,
+{
     #[inline]
-    fn from(value: String) -> Self {
+    fn from(value: T) -> Self {
         let _timer = BoaProfiler::global().start_event("From<String>", "value");
-        Self::string(value)
-    }
-}
-
-impl From<Box<str>> for Value {
-    #[inline]
-    fn from(value: Box<str>) -> Self {
-        Self::string(String::from(value))
-    }
-}
-
-impl From<&str> for Value {
-    #[inline]
-    fn from(value: &str) -> Value {
-        Value::string(value)
-    }
-}
 
-impl From<&Box<str>> for Value {
-    #[inline]
-    fn from(value: &Box<str>) -> Self {
-        Self::string(value.as_ref())
+        Self::String(value.into())
     }
 }
 
-impl From<char> for Value {
+impl From<char> for JsValue {
     #[inline]
     fn from(value: char) -> Self {
-        Value::string(value.to_string())
+        JsValue::new(value.to_string())
     }
 }
 
-impl From<JsString> for Value {
-    #[inline]
-    fn from(value: JsString) -> Self {
-        Value::String(value)
-    }
-}
-
-impl From<JsSymbol> for Value {
+impl From<JsSymbol> for JsValue {
     #[inline]
     fn from(value: JsSymbol) -> Self {
-        Value::Symbol(value)
+        JsValue::Symbol(value)
     }
 }
 
@@ -67,81 +43,86 @@ impl Display for TryFromCharError {
     }
 }
 
-impl From<f64> for Value {
+impl From<f64> for JsValue {
+    #[allow(clippy::float_cmp)]
     #[inline]
     fn from(value: f64) -> Self {
-        Self::rational(value)
+        // if value as i32 as f64 == value {
+        //     JsValue::Integer(value as i32)
+        // } else {
+        JsValue::Rational(value)
+        // }
     }
 }
 
-impl From<u32> for Value {
+impl From<u32> for JsValue {
     #[inline]
-    fn from(value: u32) -> Value {
+    fn from(value: u32) -> JsValue {
         if let Ok(integer) = i32::try_from(value) {
-            Value::integer(integer)
+            JsValue::Integer(integer)
         } else {
-            Value::rational(value)
+            JsValue::Rational(value.into())
         }
     }
 }
 
-impl From<i32> for Value {
+impl From<i32> for JsValue {
     #[inline]
-    fn from(value: i32) -> Value {
-        Value::integer(value)
+    fn from(value: i32) -> JsValue {
+        JsValue::Integer(value)
     }
 }
 
-impl From<JsBigInt> for Value {
+impl From<JsBigInt> for JsValue {
     #[inline]
     fn from(value: JsBigInt) -> Self {
-        Value::BigInt(value)
+        JsValue::BigInt(value)
     }
 }
 
-impl From<usize> for Value {
+impl From<usize> for JsValue {
     #[inline]
-    fn from(value: usize) -> Value {
+    fn from(value: usize) -> JsValue {
         if let Ok(value) = i32::try_from(value) {
-            Value::integer(value)
+            JsValue::Integer(value)
         } else {
-            Value::rational(value as f64)
+            JsValue::Rational(value as f64)
         }
     }
 }
 
-impl From<u64> for Value {
+impl From<u64> for JsValue {
     #[inline]
-    fn from(value: u64) -> Value {
+    fn from(value: u64) -> JsValue {
         if let Ok(value) = i32::try_from(value) {
-            Value::integer(value)
+            JsValue::Integer(value)
         } else {
-            Value::rational(value as f64)
+            JsValue::Rational(value as f64)
         }
     }
 }
 
-impl From<i64> for Value {
+impl From<i64> for JsValue {
     #[inline]
-    fn from(value: i64) -> Value {
+    fn from(value: i64) -> JsValue {
         if let Ok(value) = i32::try_from(value) {
-            Value::integer(value)
+            JsValue::Integer(value)
         } else {
-            Value::rational(value as f64)
+            JsValue::Rational(value as f64)
         }
     }
 }
 
-impl From<bool> for Value {
+impl From<bool> for JsValue {
     #[inline]
     fn from(value: bool) -> Self {
-        Value::boolean(value)
+        JsValue::Boolean(value)
     }
 }
 
-impl<T> From<&[T]> for Value
+impl<T> From<&[T]> for JsValue
 where
-    T: Clone + Into<Value>,
+    T: Clone + Into<JsValue>,
 {
     fn from(value: &[T]) -> Self {
         let mut array = Object::default();
@@ -159,9 +140,9 @@ where
     }
 }
 
-impl<T> From<Vec<T>> for Value
+impl<T> From<Vec<T>> for JsValue
 where
-    T: Into<Value>,
+    T: Into<JsValue>,
 {
     fn from(value: Vec<T>) -> Self {
         let mut array = Object::default();
@@ -175,22 +156,23 @@ where
                     .configurable(true),
             );
         }
-        Value::from(array)
+        JsValue::new(array)
     }
 }
 
-impl From<Object> for Value {
+impl From<Object> for JsValue {
+    #[inline]
     fn from(object: Object) -> Self {
         let _timer = BoaProfiler::global().start_event("From<Object>", "value");
-        Value::object(object)
+        JsValue::Object(GcObject::new(object))
     }
 }
 
-impl From<GcObject> for Value {
+impl From<GcObject> for JsValue {
     #[inline]
     fn from(object: GcObject) -> Self {
         let _timer = BoaProfiler::global().start_event("From<GcObject>", "value");
-        Value::Object(object)
+        JsValue::Object(object)
     }
 }
 
@@ -204,22 +186,22 @@ impl Display for TryFromObjectError {
     }
 }
 
-impl From<()> for Value {
+impl From<()> for JsValue {
     #[inline]
     fn from(_: ()) -> Self {
-        Value::null()
+        JsValue::null()
     }
 }
 
-impl<T> From<Option<T>> for Value
+impl<T> From<Option<T>> for JsValue
 where
-    T: Into<Value>,
+    T: Into<JsValue>,
 {
     #[inline]
     fn from(value: Option<T>) -> Self {
         match value {
             Some(value) => value.into(),
-            None => Value::null(),
+            None => JsValue::null(),
         }
     }
 }

boa/src/value/display.rs

@@ -3,7 +3,7 @@ use super::*;
 /// This object is used for displaying a `Value`.
 #[derive(Debug, Clone, Copy)]
 pub struct ValueDisplay<'value> {
-    pub(super) value: &'value Value,
+    pub(super) value: &'value JsValue,
 }
 
 /// A helper macro for printing objects
@@ -80,10 +80,10 @@ macro_rules! print_obj_value {
     };
 }
 
-pub(crate) fn log_string_from(x: &Value, print_internals: bool, print_children: bool) -> String {
+pub(crate) fn log_string_from(x: &JsValue, print_internals: bool, print_children: bool) -> String {
     match x {
         // We don't want to print private (compiler) or prototype properties
-        Value::Object(ref v) => {
+        JsValue::Object(ref v) => {
             // Can use the private "type" field of an Object to match on
             // which type of Object it represents for special printing
             match v.borrow().data {
@@ -122,7 +122,7 @@ pub(crate) fn log_string_from(x: &Value, print_internals: bool, print_children:
                                         .as_ref()
                                         // FIXME: handle accessor descriptors
                                         .and_then(|p| p.value())
-                                        .unwrap_or(&Value::Undefined),
+                                        .unwrap_or(&JsValue::Undefined),
                                     print_internals,
                                     false,
                                 )
@@ -177,13 +177,13 @@ pub(crate) fn log_string_from(x: &Value, print_internals: bool, print_children:
                 _ => display_obj(x, print_internals),
             }
         }
-        Value::Symbol(ref symbol) => symbol.to_string(),
+        JsValue::Symbol(ref symbol) => symbol.to_string(),
         _ => format!("{}", x.display()),
     }
 }
 
 /// A helper function for specifically printing object values
-pub(crate) fn display_obj(v: &Value, print_internals: bool) -> String {
+pub(crate) fn display_obj(v: &JsValue, print_internals: bool) -> String {
     // A simple helper for getting the address of a value
     // TODO: Find a more general place for this, as it can be used in other situations as well
     fn address_of<T>(t: &T) -> usize {
@@ -195,20 +195,20 @@ pub(crate) fn display_obj(v: &Value, print_internals: bool) -> String {
     // in-memory address in this set
     let mut encounters = HashSet::new();
 
-    if let Value::Object(object) = v {
+    if let JsValue::Object(object) = v {
         if object.borrow().is_error() {
             let name = v
                 .get_property("name")
                 .as_ref()
                 .and_then(|d| d.value())
-                .unwrap_or(&Value::Undefined)
+                .unwrap_or(&JsValue::Undefined)
                 .display()
                 .to_string();
             let message = v
                 .get_property("message")
                 .as_ref()
                 .and_then(|d| d.value())
-                .unwrap_or(&Value::Undefined)
+                .unwrap_or(&JsValue::Undefined)
                 .display()
                 .to_string();
             return format!("{}: {}", name, message);
@@ -216,12 +216,12 @@ pub(crate) fn display_obj(v: &Value, print_internals: bool) -> String {
     }
 
     fn display_obj_internal(
-        data: &Value,
+        data: &JsValue,
         encounters: &mut HashSet<usize>,
         indent: usize,
         print_internals: bool,
     ) -> String {
-        if let Value::Object(ref v) = *data {
+        if let JsValue::Object(ref v) = *data {
             // The in-memory address of the current object
             let addr = address_of(v.as_ref());
 
@@ -261,18 +261,18 @@ pub(crate) fn display_obj(v: &Value, print_internals: bool) -> String {
 impl Display for ValueDisplay<'_> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self.value {
-            Value::Null => write!(f, "null"),
-            Value::Undefined => write!(f, "undefined"),
-            Value::Boolean(v) => write!(f, "{}", v),
-            Value::Symbol(ref symbol) => match symbol.description() {
+            JsValue::Null => write!(f, "null"),
+            JsValue::Undefined => write!(f, "undefined"),
+            JsValue::Boolean(v) => write!(f, "{}", v),
+            JsValue::Symbol(ref symbol) => match symbol.description() {
                 Some(description) => write!(f, "Symbol({})", description),
                 None => write!(f, "Symbol()"),
             },
-            Value::String(ref v) => write!(f, "\"{}\"", v),
-            Value::Rational(v) => format_rational(*v, f),
-            Value::Object(_) => write!(f, "{}", log_string_from(self.value, true, true)),
-            Value::Integer(v) => write!(f, "{}", v),
-            Value::BigInt(ref num) => write!(f, "{}n", num),
+            JsValue::String(ref v) => write!(f, "\"{}\"", v),
+            JsValue::Rational(v) => format_rational(*v, f),
+            JsValue::Object(_) => write!(f, "{}", log_string_from(self.value, true, true)),
+            JsValue::Integer(v) => write!(f, "{}", v),
+            JsValue::BigInt(ref num) => write!(f, "{}n", num),
         }
     }
 }

boa/src/value/equality.rs

@@ -1,7 +1,7 @@
 use super::*;
 use crate::{builtins::Number, Context};
 
-impl Value {
+impl JsValue {
     /// Strict equality comparison.
     ///
     /// This method is executed when doing strict equality comparisons with the `===` operator.
@@ -80,10 +80,10 @@ impl Value {
             },
 
             // 8. If Type(x) is Boolean, return the result of the comparison ! ToNumber(x) == y.
-            (Self::Boolean(x), _) => return other.equals(&Value::from(*x as i32), context),
+            (Self::Boolean(x), _) => return other.equals(&JsValue::new(*x as i32), context),
 
             // 9. If Type(y) is Boolean, return the result of the comparison x == ! ToNumber(y).
-            (_, Self::Boolean(y)) => return self.equals(&Value::from(*y as i32), context),
+            (_, Self::Boolean(y)) => return self.equals(&JsValue::new(*y as i32), context),
 
             // 10. If Type(x) is either String, Number, BigInt, or Symbol and Type(y) is Object, return the result
             // of the comparison x == ? ToPrimitive(y).
@@ -119,7 +119,7 @@ impl Value {
     ///  - [ECMAScript][spec]
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-samevalue
-    pub fn same_value(x: &Value, y: &Value) -> bool {
+    pub fn same_value(x: &JsValue, y: &JsValue) -> bool {
         // 1. If Type(x) is different from Type(y), return false.
         if x.get_type() != y.get_type() {
             return false;
@@ -128,11 +128,11 @@ impl Value {
         match (x, y) {
             // 2. If Type(x) is Number or BigInt, then
             //    a. Return ! Type(x)::SameValue(x, y).
-            (Value::BigInt(x), Value::BigInt(y)) => JsBigInt::same_value(x, y),
-            (Value::Rational(x), Value::Rational(y)) => Number::same_value(*x, *y),
-            (Value::Rational(x), Value::Integer(y)) => Number::same_value(*x, f64::from(*y)),
-            (Value::Integer(x), Value::Rational(y)) => Number::same_value(f64::from(*x), *y),
-            (Value::Integer(x), Value::Integer(y)) => x == y,
+            (JsValue::BigInt(x), JsValue::BigInt(y)) => JsBigInt::same_value(x, y),
+            (JsValue::Rational(x), JsValue::Rational(y)) => Number::same_value(*x, *y),
+            (JsValue::Rational(x), JsValue::Integer(y)) => Number::same_value(*x, f64::from(*y)),
+            (JsValue::Integer(x), JsValue::Rational(y)) => Number::same_value(f64::from(*x), *y),
+            (JsValue::Integer(x), JsValue::Integer(y)) => x == y,
 
             // 3. Return ! SameValueNonNumeric(x, y).
             (_, _) => Self::same_value_non_numeric(x, y),
@@ -148,7 +148,7 @@ impl Value {
     ///  - [ECMAScript][spec]
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-samevaluezero
-    pub fn same_value_zero(x: &Value, y: &Value) -> bool {
+    pub fn same_value_zero(x: &JsValue, y: &JsValue) -> bool {
         if x.get_type() != y.get_type() {
             return false;
         }
@@ -156,26 +156,30 @@ impl Value {
         match (x, y) {
             // 2. If Type(x) is Number or BigInt, then
             //    a. Return ! Type(x)::SameValueZero(x, y).
-            (Value::BigInt(x), Value::BigInt(y)) => JsBigInt::same_value_zero(x, y),
+            (JsValue::BigInt(x), JsValue::BigInt(y)) => JsBigInt::same_value_zero(x, y),
 
-            (Value::Rational(x), Value::Rational(y)) => Number::same_value_zero(*x, *y),
-            (Value::Rational(x), Value::Integer(y)) => Number::same_value_zero(*x, f64::from(*y)),
-            (Value::Integer(x), Value::Rational(y)) => Number::same_value_zero(f64::from(*x), *y),
-            (Value::Integer(x), Value::Integer(y)) => x == y,
+            (JsValue::Rational(x), JsValue::Rational(y)) => Number::same_value_zero(*x, *y),
+            (JsValue::Rational(x), JsValue::Integer(y)) => {
+                Number::same_value_zero(*x, f64::from(*y))
+            }
+            (JsValue::Integer(x), JsValue::Rational(y)) => {
+                Number::same_value_zero(f64::from(*x), *y)
+            }
+            (JsValue::Integer(x), JsValue::Integer(y)) => x == y,
 
             // 3. Return ! SameValueNonNumeric(x, y).
             (_, _) => Self::same_value_non_numeric(x, y),
         }
     }
 
-    fn same_value_non_numeric(x: &Value, y: &Value) -> bool {
+    fn same_value_non_numeric(x: &JsValue, y: &JsValue) -> bool {
         debug_assert!(x.get_type() == y.get_type());
         match (x, y) {
-            (Value::Null, Value::Null) | (Value::Undefined, Value::Undefined) => true,
-            (Value::String(ref x), Value::String(ref y)) => x == y,
-            (Value::Boolean(x), Value::Boolean(y)) => x == y,
-            (Value::Object(ref x), Value::Object(ref y)) => GcObject::equals(x, y),
-            (Value::Symbol(ref x), Value::Symbol(ref y)) => x == y,
+            (JsValue::Null, JsValue::Null) | (JsValue::Undefined, JsValue::Undefined) => true,
+            (JsValue::String(ref x), JsValue::String(ref y)) => x == y,
+            (JsValue::Boolean(x), JsValue::Boolean(y)) => x == y,
+            (JsValue::Object(ref x), JsValue::Object(ref y)) => GcObject::equals(x, y),
+            (JsValue::Symbol(ref x), JsValue::Symbol(ref y)) => x == y,
             _ => false,
         }
     }

boa/src/value/hash.rs

@@ -3,13 +3,13 @@ use super::*;
 use crate::builtins::Number;
 use std::hash::{Hash, Hasher};
 
-impl PartialEq for Value {
+impl PartialEq for JsValue {
     fn eq(&self, other: &Self) -> bool {
         Self::same_value_zero(self, other)
     }
 }
 
-impl Eq for Value {}
+impl Eq for JsValue {}
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 struct UndefinedHashable;
@@ -36,7 +36,7 @@ impl Hash for RationalHashable {
     }
 }
 
-impl Hash for Value {
+impl Hash for JsValue {
     fn hash<H: Hasher>(&self, state: &mut H) {
         match self {
             Self::Undefined => UndefinedHashable.hash(state),