Remove direct conversion from `&str` to `JsValue`/`PropertyKey`. (#3319)

* Remove direct conversion from `&str` to `JsValue`/`PropertyKey`.

* Allow unused static strings

* Introduce DHAT to benchmark data usage

* Create new release profile

* Fix docs

.gitignore

@@ -39,3 +39,7 @@ chrome_profiler.json
 # e2e test
 playwright-report
 test-results
+
+# dhat
+dhat-*.json
+perf.data*

Cargo.lock

@@ -342,6 +342,7 @@ dependencies = [
  "boa_runtime",
  "clap",
  "colored",
+ "dhat",
  "jemallocator",
  "phf",
  "pollster",
@@ -389,6 +390,7 @@ dependencies = [
  "num-traits",
  "num_enum",
  "once_cell",
+ "paste",
  "pollster",
  "rand",
  "regress",
@@ -954,6 +956,22 @@ dependencies = [
  "syn 2.0.37",
 ]
 
+[[package]]
+name = "dhat"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4f2aaf837aaf456f6706cb46386ba8dffd4013a757e36f4ea05c20dd46b209a3"
+dependencies = [
+ "backtrace",
+ "lazy_static",
+ "mintex",
+ "parking_lot 0.12.1",
+ "rustc-hash",
+ "serde",
+ "serde_json",
+ "thousands",
+]
+
 [[package]]
 name = "displaydoc"
 version = "0.2.4"
@@ -1882,6 +1900,16 @@ dependencies = [
  "adler",
 ]
 
+[[package]]
+name = "mintex"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fd7c5ba1c3b5a23418d7bbf98c71c3d4946a0125002129231da8d6b723d559cb"
+dependencies = [
+ "once_cell",
+ "sys-info",
+]
+
 [[package]]
 name = "mio"
 version = "0.8.8"
@@ -2083,6 +2111,12 @@ dependencies = [
  "windows-targets",
 ]
 
+[[package]]
+name = "paste"
+version = "1.0.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "de3145af08024dea9fa9914f381a17b8fc6034dfb00f3a84013f7ff43f29ed4c"
+
 [[package]]
 name = "percent-encoding"
 version = "2.3.0"
@@ -2831,6 +2865,16 @@ dependencies = [
  "unicode-xid",
 ]
 
+[[package]]
+name = "sys-info"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b3a0d0aba8bf96a0e1ddfdc352fc53b3df7f39318c71854910c3c4b024ae52c"
+dependencies = [
+ "cc",
+ "libc",
+]
+
 [[package]]
 name = "sys-locale"
 version = "0.3.1"
@@ -2892,6 +2936,12 @@ dependencies = [
  "syn 2.0.37",
 ]
 
+[[package]]
+name = "thousands"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3bf63baf9f5039dadc247375c29eb13706706cfde997d0330d05aa63a77d8820"
+
 [[package]]
 name = "thread_local"
 version = "1.1.7"

Cargo.toml

@@ -101,6 +101,10 @@ lto = "fat"
 # Makes sure that all code is compiled together, for LTO
 codegen-units = 1
 
+[profile.release-dbg]
+inherits = "release"
+debug = true
+
 # The test profile, used for `cargo test`.
 [profile.test]
 # Enables thin local LTO and some optimizations.

boa_cli/Cargo.toml

@@ -25,9 +25,11 @@ colored.workspace = true
 regex.workspace = true
 phf = { workspace = true, features = ["macros"] }
 pollster.workspace = true
+dhat = { version = "0.3.2", optional = true }
 
 [features]
 default = ["boa_engine/annex-b", "boa_engine/experimental", "boa_engine/intl"]
+dhat = ["dep:dhat"]
 
 [target.x86_64-unknown-linux-gnu.dependencies]
 jemallocator.workspace = true

boa_cli/src/debug/function.rs

@@ -1,4 +1,5 @@
 use boa_engine::{
+    js_string,
     object::ObjectInitializer,
     vm::flowgraph::{Direction, Graph},
     Context, JsArgs, JsNativeError, JsObject, JsResult, JsValue, NativeFunction,
@@ -67,8 +68,10 @@ fn flowgraph(_this: &JsValue, args: &[JsValue], context: &mut Context<'_>) -> Js
     let mut direction = Direction::LeftToRight;
     if let Some(arguments) = args.get(1) {
         if let Some(arguments) = arguments.as_object() {
-            format = flowgraph_parse_format_option(&arguments.get("format", context)?)?;
-            direction = flowgraph_parse_direction_option(&arguments.get("direction", context)?)?;
+            format = flowgraph_parse_format_option(&arguments.get(js_string!("format"), context)?)?;
+            direction = flowgraph_parse_direction_option(
+                &arguments.get(js_string!("direction"), context)?,
+            )?;
         } else if value.is_string() {
             format = flowgraph_parse_format_option(value)?;
         } else {
@@ -97,7 +100,7 @@ fn flowgraph(_this: &JsValue, args: &[JsValue], context: &mut Context<'_>) -> Js
         FlowgraphFormat::Mermaid => graph.to_mermaid_format(),
     };
 
-    Ok(JsValue::new(result))
+    Ok(JsValue::new(js_string!(result)))
 }
 
 fn bytecode(_: &JsValue, args: &[JsValue], context: &mut Context<'_>) -> JsResult<JsValue> {
@@ -122,7 +125,7 @@ fn bytecode(_: &JsValue, args: &[JsValue], context: &mut Context<'_>) -> JsResul
         JsNativeError::typ().with_message("native functions do not have bytecode")
     })?;
 
-    Ok(code.to_interned_string(context.interner()).into())
+    Ok(js_string!(code.to_interned_string(context.interner())).into())
 }
 
 fn set_trace_flag_in_function_object(object: &JsObject, value: bool) -> JsResult<()> {
@@ -176,9 +179,21 @@ fn traceable(_: &JsValue, args: &[JsValue], _: &mut Context<'_>) -> JsResult<JsV
 
 pub(super) fn create_object(context: &mut Context<'_>) -> JsObject {
     ObjectInitializer::new(context)
-        .function(NativeFunction::from_fn_ptr(flowgraph), "flowgraph", 1)
-        .function(NativeFunction::from_fn_ptr(bytecode), "bytecode", 1)
-        .function(NativeFunction::from_fn_ptr(trace), "trace", 1)
-        .function(NativeFunction::from_fn_ptr(traceable), "traceable", 2)
+        .function(
+            NativeFunction::from_fn_ptr(flowgraph),
+            js_string!("flowgraph"),
+            1,
+        )
+        .function(
+            NativeFunction::from_fn_ptr(bytecode),
+            js_string!("bytecode"),
+            1,
+        )
+        .function(NativeFunction::from_fn_ptr(trace), js_string!("trace"), 1)
+        .function(
+            NativeFunction::from_fn_ptr(traceable),
+            js_string!("traceable"),
+            2,
+        )
         .build()
 }

boa_cli/src/debug/gc.rs

@@ -1,4 +1,6 @@
-use boa_engine::{object::ObjectInitializer, Context, JsObject, JsResult, JsValue, NativeFunction};
+use boa_engine::{
+    js_string, object::ObjectInitializer, Context, JsObject, JsResult, JsValue, NativeFunction,
+};
 
 /// Trigger garbage collection.
 fn collect(_: &JsValue, _: &[JsValue], _: &mut Context<'_>) -> JsResult<JsValue> {
@@ -8,6 +10,10 @@ fn collect(_: &JsValue, _: &[JsValue], _: &mut Context<'_>) -> JsResult<JsValue>
 
 pub(super) fn create_object(context: &mut Context<'_>) -> JsObject {
     ObjectInitializer::new(context)
-        .function(NativeFunction::from_fn_ptr(collect), "collect", 0)
+        .function(
+            NativeFunction::from_fn_ptr(collect),
+            js_string!("collect"),
+            0,
+        )
         .build()
 }

boa_cli/src/debug/limits.rs

@@ -1,4 +1,5 @@
 use boa_engine::{
+    js_string,
     object::{FunctionObjectBuilder, ObjectInitializer},
     property::Attribute,
     Context, JsArgs, JsNativeError, JsObject, JsResult, JsValue, NativeFunction,
@@ -55,13 +56,13 @@ pub(super) fn create_object(context: &mut Context<'_>) -> JsObject {
             .build();
     ObjectInitializer::new(context)
         .accessor(
-            "loop",
+            js_string!("loop"),
             Some(get_loop),
             Some(set_loop),
             Attribute::WRITABLE | Attribute::CONFIGURABLE | Attribute::NON_ENUMERABLE,
         )
         .accessor(
-            "recursion",
+            js_string!("recursion"),
             Some(get_recursion),
             Some(set_recursion),
             Attribute::WRITABLE | Attribute::CONFIGURABLE | Attribute::NON_ENUMERABLE,

boa_cli/src/debug/mod.rs

@@ -1,7 +1,7 @@
 // Allow lint so it, doesn't warn about `JsResult<>` unneeded return on functions.
 #![allow(clippy::unnecessary_wraps)]
 
-use boa_engine::{object::ObjectInitializer, property::Attribute, Context, JsObject};
+use boa_engine::{js_string, object::ObjectInitializer, property::Attribute, Context, JsObject};
 
 mod function;
 mod gc;
@@ -22,37 +22,37 @@ fn create_boa_object(context: &mut Context<'_>) -> JsObject {
 
     ObjectInitializer::new(context)
         .property(
-            "function",
+            js_string!("function"),
             function_module,
             Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE,
         )
         .property(
-            "object",
+            js_string!("object"),
             object_module,
             Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE,
         )
         .property(
-            "shape",
+            js_string!("shape"),
             shape_module,
             Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE,
         )
         .property(
-            "optimizer",
+            js_string!("optimizer"),
             optimizer_module,
             Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE,
         )
         .property(
-            "gc",
+            js_string!("gc"),
             gc_module,
             Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE,
         )
         .property(
-            "realm",
+            js_string!("realm"),
             realm_module,
             Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE,
         )
         .property(
-            "limits",
+            js_string!("limits"),
             limits_module,
             Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE,
         )
@@ -63,7 +63,7 @@ pub(crate) fn init_boa_debug_object(context: &mut Context<'_>) {
     let boa_object = create_boa_object(context);
     context
         .register_global_property(
-            "$boa",
+            js_string!("$boa"),
             boa_object,
             Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE,
         )

boa_cli/src/debug/object.rs

@@ -1,5 +1,6 @@
 use boa_engine::{
-    object::ObjectInitializer, Context, JsNativeError, JsObject, JsResult, JsValue, NativeFunction,
+    js_string, object::ObjectInitializer, Context, JsNativeError, JsObject, JsResult, JsValue,
+    NativeFunction,
 };
 
 /// Returns objects pointer in memory.
@@ -17,11 +18,11 @@ fn id(_: &JsValue, args: &[JsValue], _: &mut Context<'_>) -> JsResult<JsValue> {
     };
 
     let ptr: *const _ = object.as_ref();
-    Ok(format!("0x{:X}", ptr as usize).into())
+    Ok(js_string!(format!("0x{:X}", ptr as usize)).into())
 }
 
 pub(super) fn create_object(context: &mut Context<'_>) -> JsObject {
     ObjectInitializer::new(context)
-        .function(NativeFunction::from_fn_ptr(id), "id", 1)
+        .function(NativeFunction::from_fn_ptr(id), js_string!("id"), 1)
         .build()
 }

boa_cli/src/debug/optimizer.rs

@@ -1,4 +1,5 @@
 use boa_engine::{
+    js_string,
     object::{FunctionObjectBuilder, ObjectInitializer},
     optimizer::OptimizerOptions,
     property::Attribute,
@@ -71,13 +72,13 @@ pub(super) fn create_object(context: &mut Context<'_>) -> JsObject {
             .build();
     ObjectInitializer::new(context)
         .accessor(
-            "constantFolding",
+            js_string!("constantFolding"),
             Some(get_constant_folding),
             Some(set_constant_folding),
             Attribute::WRITABLE | Attribute::CONFIGURABLE | Attribute::NON_ENUMERABLE,
         )
         .accessor(
-            "statistics",
+            js_string!("statistics"),
             Some(get_statistics),
             Some(set_statistics),
             Attribute::WRITABLE | Attribute::CONFIGURABLE | Attribute::NON_ENUMERABLE,

boa_cli/src/debug/realm.rs

@@ -1,4 +1,6 @@
-use boa_engine::{object::ObjectInitializer, Context, JsObject, JsResult, JsValue, NativeFunction};
+use boa_engine::{
+    js_string, object::ObjectInitializer, Context, JsObject, JsResult, JsValue, NativeFunction,
+};
 
 /// Creates a new ECMAScript Realm and returns the global object of the realm.
 fn create(_: &JsValue, _: &[JsValue], _: &mut Context<'_>) -> JsResult<JsValue> {
@@ -9,6 +11,6 @@ fn create(_: &JsValue, _: &[JsValue], _: &mut Context<'_>) -> JsResult<JsValue>
 
 pub(super) fn create_object(context: &mut Context<'_>) -> JsObject {
     ObjectInitializer::new(context)
-        .function(NativeFunction::from_fn_ptr(create), "create", 0)
+        .function(NativeFunction::from_fn_ptr(create), js_string!("create"), 0)
         .build()
 }

boa_cli/src/debug/shape.rs

@@ -23,7 +23,7 @@ fn id(_: &JsValue, args: &[JsValue], _: &mut Context<'_>) -> JsResult<JsValue> {
     let object = get_object(args, 0)?;
     let object = object.borrow();
     let shape = object.shape();
-    Ok(format!("0x{:X}", shape.to_addr_usize()).into())
+    Ok(js_string!(format!("0x{:X}", shape.to_addr_usize())).into())
 }
 
 /// Returns object's shape type.
@@ -62,8 +62,8 @@ fn same(_: &JsValue, args: &[JsValue], _: &mut Context<'_>) -> JsResult<JsValue>
 
 pub(super) fn create_object(context: &mut Context<'_>) -> JsObject {
     ObjectInitializer::new(context)
-        .function(NativeFunction::from_fn_ptr(id), "id", 1)
-        .function(NativeFunction::from_fn_ptr(r#type), "type", 1)
-        .function(NativeFunction::from_fn_ptr(same), "same", 2)
+        .function(NativeFunction::from_fn_ptr(id), js_string!("id"), 1)
+        .function(NativeFunction::from_fn_ptr(r#type), js_string!("type"), 1)
+        .function(NativeFunction::from_fn_ptr(same), js_string!("same"), 2)
         .build()
 }

boa_cli/src/main.rs

@@ -70,6 +70,7 @@ use boa_engine::{
     builtins::promise::PromiseState,
     context::ContextBuilder,
     job::{FutureJob, JobQueue, NativeJob},
+    js_string,
     module::{Module, ModuleLoader, SimpleModuleLoader},
     optimizer::OptimizerOptions,
     property::Attribute,
@@ -87,13 +88,22 @@ use std::{
     println,
 };
 
-#[cfg(all(target_arch = "x86_64", target_os = "linux", target_env = "gnu"))]
+#[cfg(all(
+    target_arch = "x86_64",
+    target_os = "linux",
+    target_env = "gnu",
+    not(feature = "dhat")
+))]
 #[cfg_attr(
     all(target_arch = "x86_64", target_os = "linux", target_env = "gnu"),
     global_allocator
 )]
 static ALLOC: jemallocator::Jemalloc = jemallocator::Jemalloc;
 
+#[cfg(feature = "dhat")]
+#[global_allocator]
+static ALLOC: dhat::Alloc = dhat::Alloc;
+
 /// CLI configuration for Boa.
 static CLI_HISTORY: &str = ".boa_history";
 
@@ -366,6 +376,9 @@ fn evaluate_files(
 }
 
 fn main() -> Result<(), io::Error> {
+    #[cfg(feature = "dhat")]
+    let _profiler = dhat::Profiler::new_heap();
+
     let args = Opt::parse();
 
     let queue: &dyn JobQueue = &Jobs::default();
@@ -480,7 +493,7 @@ fn main() -> Result<(), io::Error> {
 fn add_runtime(context: &mut Context<'_>) {
     let console = Console::init(context);
     context
-        .register_global_property(Console::NAME, console, Attribute::all())
+        .register_global_property(js_string!(Console::NAME), console, Attribute::all())
         .expect("the console object shouldn't exist");
 }
 

boa_engine/Cargo.toml

@@ -80,6 +80,7 @@ pollster.workspace = true
 thin-vec.workspace = true
 itertools = { version = "0.11.0", default-features = false }
 icu_normalizer = "~1.3.0"
+paste = "1.0"
 
 # intl deps
 boa_icu_provider = {workspace = true, features = ["std"], optional = true }

boa_engine/src/builtins/array/array_iterator.rs

@@ -11,6 +11,7 @@ use crate::{
     },
     context::intrinsics::Intrinsics,
     error::JsNativeError,
+    js_string,
     object::{JsObject, ObjectData},
     property::{Attribute, PropertyNameKind},
     realm::Realm,
@@ -37,7 +38,7 @@ pub struct ArrayIterator {
 
 impl IntrinsicObject for ArrayIterator {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event("ArrayIterator", "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         BuiltInBuilder::with_intrinsic::<Self>(realm)
             .prototype(
@@ -47,10 +48,10 @@ impl IntrinsicObject for ArrayIterator {
                     .iterator_prototypes()
                     .iterator(),
             )
-            .static_method(Self::next, "next", 0)
+            .static_method(Self::next, js_string!("next"), 0)
             .static_property(
                 JsSymbol::to_string_tag(),
-                "Array Iterator",
+                js_string!("Array Iterator"),
                 Attribute::CONFIGURABLE,
             )
             .build();

boa_engine/src/builtins/array/mod.rs

@@ -23,9 +23,10 @@ use crate::{
     object::{internal_methods::get_prototype_from_constructor, JsObject, ObjectData, CONSTRUCTOR},
     property::{Attribute, PropertyDescriptor, PropertyNameKind},
     realm::Realm,
+    string::common::StaticJsStrings,
     symbol::JsSymbol,
     value::{IntegerOrInfinity, JsValue},
-    Context, JsArgs, JsResult,
+    Context, JsArgs, JsResult, JsString,
 };
 use std::cmp::{max, min, Ordering};
 
@@ -49,13 +50,13 @@ pub(crate) struct Array;
 
 impl IntrinsicObject for Array {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         let symbol_iterator = JsSymbol::iterator();
         let symbol_unscopables = JsSymbol::unscopables();
 
         let get_species = BuiltInBuilder::callable(realm, Self::get_species)
-            .name("get [Symbol.species]")
+            .name(js_string!("get [Symbol.species]"))
             .build();
 
         let values_function = BuiltInBuilder::callable_with_object(
@@ -63,7 +64,7 @@ impl IntrinsicObject for Array {
             realm.intrinsics().objects().array_prototype_values().into(),
             Self::values,
         )
-        .name("values")
+        .name(js_string!("values"))
         .build();
 
         let to_string_function = BuiltInBuilder::callable_with_object(
@@ -75,7 +76,7 @@ impl IntrinsicObject for Array {
                 .into(),
             Self::to_string,
         )
-        .name("toString")
+        .name(js_string!("toString"))
         .build();
 
         let unscopables_object = Self::unscopables_object();
@@ -107,47 +108,47 @@ impl IntrinsicObject for Array {
                 unscopables_object,
                 Attribute::READONLY | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE,
             )
-            .method(Self::at, "at", 1)
-            .method(Self::concat, "concat", 1)
-            .method(Self::push, "push", 1)
-            .method(Self::index_of, "indexOf", 1)
-            .method(Self::last_index_of, "lastIndexOf", 1)
-            .method(Self::includes_value, "includes", 1)
-            .method(Self::map, "map", 1)
-            .method(Self::fill, "fill", 1)
-            .method(Self::for_each, "forEach", 1)
-            .method(Self::filter, "filter", 1)
-            .method(Self::pop, "pop", 0)
-            .method(Self::join, "join", 1)
+            .method(Self::at, js_string!("at"), 1)
+            .method(Self::concat, js_string!("concat"), 1)
+            .method(Self::push, js_string!("push"), 1)
+            .method(Self::index_of, js_string!("indexOf"), 1)
+            .method(Self::last_index_of, js_string!("lastIndexOf"), 1)
+            .method(Self::includes_value, js_string!("includes"), 1)
+            .method(Self::map, js_string!("map"), 1)
+            .method(Self::fill, js_string!("fill"), 1)
+            .method(Self::for_each, js_string!("forEach"), 1)
+            .method(Self::filter, js_string!("filter"), 1)
+            .method(Self::pop, js_string!("pop"), 0)
+            .method(Self::join, js_string!("join"), 1)
             .property(
                 utf16!("toString"),
                 to_string_function,
                 Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE,
             )
-            .method(Self::reverse, "reverse", 0)
-            .method(Self::shift, "shift", 0)
-            .method(Self::unshift, "unshift", 1)
-            .method(Self::every, "every", 1)
-            .method(Self::find, "find", 1)
-            .method(Self::find_index, "findIndex", 1)
-            .method(Self::find_last, "findLast", 1)
-            .method(Self::find_last_index, "findLastIndex", 1)
-            .method(Self::flat, "flat", 0)
-            .method(Self::flat_map, "flatMap", 1)
-            .method(Self::slice, "slice", 2)
-            .method(Self::some, "some", 1)
-            .method(Self::sort, "sort", 1)
-            .method(Self::splice, "splice", 2)
-            .method(Self::to_locale_string, "toLocaleString", 0)
-            .method(Self::reduce, "reduce", 1)
-            .method(Self::reduce_right, "reduceRight", 1)
-            .method(Self::keys, "keys", 0)
-            .method(Self::entries, "entries", 0)
-            .method(Self::copy_within, "copyWithin", 2)
+            .method(Self::reverse, js_string!("reverse"), 0)
+            .method(Self::shift, js_string!("shift"), 0)
+            .method(Self::unshift, js_string!("unshift"), 1)
+            .method(Self::every, js_string!("every"), 1)
+            .method(Self::find, js_string!("find"), 1)
+            .method(Self::find_index, js_string!("findIndex"), 1)
+            .method(Self::find_last, js_string!("findLast"), 1)
+            .method(Self::find_last_index, js_string!("findLastIndex"), 1)
+            .method(Self::flat, js_string!("flat"), 0)
+            .method(Self::flat_map, js_string!("flatMap"), 1)
+            .method(Self::slice, js_string!("slice"), 2)
+            .method(Self::some, js_string!("some"), 1)
+            .method(Self::sort, js_string!("sort"), 1)
+            .method(Self::splice, js_string!("splice"), 2)
+            .method(Self::to_locale_string, js_string!("toLocaleString"), 0)
+            .method(Self::reduce, js_string!("reduce"), 1)
+            .method(Self::reduce_right, js_string!("reduceRight"), 1)
+            .method(Self::keys, js_string!("keys"), 0)
+            .method(Self::entries, js_string!("entries"), 0)
+            .method(Self::copy_within, js_string!("copyWithin"), 2)
             // Static Methods
-            .static_method(Self::from, "from", 1)
-            .static_method(Self::is_array, "isArray", 1)
-            .static_method(Self::of, "of", 0)
+            .static_method(Self::from, js_string!("from"), 1)
+            .static_method(Self::is_array, js_string!("isArray"), 1)
+            .static_method(Self::of, js_string!("of"), 0)
             .build();
     }
 
@@ -157,7 +158,7 @@ impl IntrinsicObject for Array {
 }
 
 impl BuiltInObject for Array {
-    const NAME: &'static str = "Array";
+    const NAME: JsString = StaticJsStrings::ARRAY;
 }
 
 impl BuiltInConstructor for Array {

boa_engine/src/builtins/array/tests.rs

@@ -1,5 +1,7 @@
 use super::Array;
-use crate::{builtins::Number, run_test_actions, Context, JsNativeErrorKind, JsValue, TestAction};
+use crate::{
+    builtins::Number, js_string, run_test_actions, Context, JsNativeErrorKind, JsValue, TestAction,
+};
 use indoc::indoc;
 
 #[test]
@@ -36,7 +38,7 @@ fn of() {
         TestAction::assert("arrayEquals(Array.of(), [])"),
         TestAction::run("let a = Array.of.call(Date, 'a', undefined, 3);"),
         TestAction::assert("a instanceof Date"),
-        TestAction::assert_eq("a[0]", "a"),
+        TestAction::assert_eq("a[0]", js_string!("a")),
         TestAction::assert_eq("a[1]", JsValue::undefined()),
         TestAction::assert_eq("a[2]", 3),
         TestAction::assert_eq("a.length", 3),
@@ -72,18 +74,18 @@ fn copy_within() {
 #[test]
 fn join() {
     run_test_actions([
-        TestAction::assert_eq("[].join('.')", ""),
-        TestAction::assert_eq("['a'].join('.')", "a"),
-        TestAction::assert_eq("['a', 'b', 'c'].join('.')", "a.b.c"),
+        TestAction::assert_eq("[].join('.')", js_string!()),
+        TestAction::assert_eq("['a'].join('.')", js_string!("a")),
+        TestAction::assert_eq("['a', 'b', 'c'].join('.')", js_string!("a.b.c")),
     ]);
 }
 
 #[test]
 fn to_string() {
     run_test_actions([
-        TestAction::assert_eq("[].toString()", ""),
-        TestAction::assert_eq("['a'].toString()", "a"),
-        TestAction::assert_eq("['a', 'b', 'c'].toString()", "a,b,c"),
+        TestAction::assert_eq("[].toString()", js_string!()),
+        TestAction::assert_eq("['a'].toString()", js_string!("a")),
+        TestAction::assert_eq("['a', 'b', 'c'].toString()", js_string!("a,b,c")),
     ]);
 }
 
@@ -113,7 +115,7 @@ fn every() {
 fn find() {
     run_test_actions([TestAction::assert_eq(
         "['a', 'b', 'c'].find(e => e == 'a')",
-        "a",
+        js_string!("a"),
     )]);
 }
 
@@ -347,7 +349,7 @@ fn fill_obj_ref() {
                 let a = new Array(3).fill(obj);
                 obj.hi = 'hi'
             "#}),
-        TestAction::assert_eq("a[2].hi", "hi"),
+        TestAction::assert_eq("a[2].hi", js_string!("hi")),
     ]);
 }
 

boa_engine/src/builtins/array_buffer/mod.rs

@@ -14,13 +14,14 @@ use crate::{
     builtins::{typed_array::TypedArrayKind, BuiltInObject},
     context::intrinsics::{Intrinsics, StandardConstructor, StandardConstructors},
     error::JsNativeError,
+    js_string,
     object::{internal_methods::get_prototype_from_constructor, JsObject, ObjectData},
     property::Attribute,
     realm::Realm,
-    string::utf16,
+    string::common::StaticJsStrings,
     symbol::JsSymbol,
     value::{IntegerOrInfinity, Numeric},
-    Context, JsArgs, JsResult, JsValue,
+    Context, JsArgs, JsResult, JsString, JsValue,
 };
 use boa_gc::{Finalize, Trace};
 use boa_profiler::Profiler;
@@ -49,21 +50,21 @@ impl ArrayBuffer {
 
 impl IntrinsicObject for ArrayBuffer {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         let flag_attributes = Attribute::CONFIGURABLE | Attribute::NON_ENUMERABLE;
 
         let get_species = BuiltInBuilder::callable(realm, Self::get_species)
-            .name("get [Symbol.species]")
+            .name(js_string!("get [Symbol.species]"))
             .build();
 
         let get_byte_length = BuiltInBuilder::callable(realm, Self::get_byte_length)
-            .name("get byteLength")
+            .name(js_string!("get byteLength"))
             .build();
 
         BuiltInBuilder::from_standard_constructor::<Self>(realm)
             .accessor(
-                utf16!("byteLength"),
+                js_string!("byteLength"),
                 Some(get_byte_length),
                 None,
                 flag_attributes,
@@ -74,8 +75,8 @@ impl IntrinsicObject for ArrayBuffer {
                 None,
                 Attribute::CONFIGURABLE,
             )
-            .static_method(Self::is_view, "isView", 1)
-            .method(Self::slice, "slice", 2)
+            .static_method(Self::is_view, js_string!("isView"), 1)
+            .method(Self::slice, js_string!("slice"), 2)
             .property(
                 JsSymbol::to_string_tag(),
                 Self::NAME,
@@ -90,7 +91,7 @@ impl IntrinsicObject for ArrayBuffer {
 }
 
 impl BuiltInObject for ArrayBuffer {
-    const NAME: &'static str = "ArrayBuffer";
+    const NAME: JsString = StaticJsStrings::ARRAY_BUFFER;
 }
 
 impl BuiltInConstructor for ArrayBuffer {

boa_engine/src/builtins/async_function/mod.rs

@@ -12,8 +12,9 @@ use crate::{
     context::intrinsics::{Intrinsics, StandardConstructor, StandardConstructors},
     property::Attribute,
     realm::Realm,
+    string::common::StaticJsStrings,
     symbol::JsSymbol,
-    Context, JsResult, JsValue,
+    Context, JsResult, JsString, JsValue,
 };
 use boa_profiler::Profiler;
 
@@ -25,7 +26,7 @@ pub struct AsyncFunction;
 
 impl IntrinsicObject for AsyncFunction {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         BuiltInBuilder::from_standard_constructor::<Self>(realm)
             .prototype(realm.intrinsics().constructors().function().constructor())
@@ -46,7 +47,7 @@ impl IntrinsicObject for AsyncFunction {
 }
 
 impl BuiltInObject for AsyncFunction {
-    const NAME: &'static str = "AsyncFunction";
+    const NAME: JsString = StaticJsStrings::ASYNC_FUNCTION;
 }
 
 impl BuiltInConstructor for AsyncFunction {

boa_engine/src/builtins/async_generator/mod.rs

@@ -12,14 +12,16 @@ use crate::{
     },
     context::intrinsics::Intrinsics,
     error::JsNativeError,
+    js_string,
     native_function::NativeFunction,
     object::{FunctionObjectBuilder, JsObject, CONSTRUCTOR},
     property::Attribute,
     realm::Realm,
+    string::common::StaticJsStrings,
     symbol::JsSymbol,
     value::JsValue,
     vm::{CompletionRecord, GeneratorResumeKind},
-    Context, JsArgs, JsError, JsResult,
+    Context, JsArgs, JsError, JsResult, JsString,
 };
 use boa_gc::{Finalize, Trace};
 use boa_profiler::Profiler;
@@ -68,7 +70,7 @@ pub struct AsyncGenerator {
 
 impl IntrinsicObject for AsyncGenerator {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         BuiltInBuilder::with_intrinsic::<Self>(realm)
             .prototype(
@@ -78,9 +80,9 @@ impl IntrinsicObject for AsyncGenerator {
                     .iterator_prototypes()
                     .async_iterator(),
             )
-            .static_method(Self::next, "next", 1)
-            .static_method(Self::r#return, "return", 1)
-            .static_method(Self::throw, "throw", 1)
+            .static_method(Self::next, js_string!("next"), 1)
+            .static_method(Self::r#return, js_string!("return"), 1)
+            .static_method(Self::throw, js_string!("throw"), 1)
             .static_property(
                 JsSymbol::to_string_tag(),
                 Self::NAME,
@@ -104,7 +106,7 @@ impl IntrinsicObject for AsyncGenerator {
 }
 
 impl AsyncGenerator {
-    const NAME: &'static str = "AsyncGenerator";
+    const NAME: JsString = StaticJsStrings::ASYNC_GENERATOR;
 
     /// `AsyncGenerator.prototype.next ( value )`
     ///

boa_engine/src/builtins/async_generator_function/mod.rs

@@ -11,9 +11,10 @@ use crate::{
     object::{JsObject, PROTOTYPE},
     property::Attribute,
     realm::Realm,
+    string::common::StaticJsStrings,
     symbol::JsSymbol,
     value::JsValue,
-    Context, JsResult,
+    Context, JsResult, JsString,
 };
 use boa_profiler::Profiler;
 
@@ -25,7 +26,7 @@ pub struct AsyncGeneratorFunction;
 
 impl IntrinsicObject for AsyncGeneratorFunction {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         BuiltInBuilder::from_standard_constructor::<Self>(realm)
             .inherits(Some(
@@ -51,7 +52,7 @@ impl IntrinsicObject for AsyncGeneratorFunction {
 }
 
 impl BuiltInObject for AsyncGeneratorFunction {
-    const NAME: &'static str = "AsyncGeneratorFunction";
+    const NAME: JsString = StaticJsStrings::ASYNC_GENERATOR_FUNCTION;
 }
 
 impl BuiltInConstructor for AsyncGeneratorFunction {

boa_engine/src/builtins/bigint/mod.rs

@@ -16,12 +16,14 @@ use crate::{
     builtins::BuiltInObject,
     context::intrinsics::{Intrinsics, StandardConstructor, StandardConstructors},
     error::JsNativeError,
+    js_string,
     object::JsObject,
     property::Attribute,
     realm::Realm,
+    string::common::StaticJsStrings,
     symbol::JsSymbol,
     value::{IntegerOrInfinity, PreferredType},
-    Context, JsArgs, JsBigInt, JsResult, JsValue,
+    Context, JsArgs, JsBigInt, JsResult, JsString, JsValue,
 };
 use boa_profiler::Profiler;
 use num_bigint::ToBigInt;
@@ -37,13 +39,13 @@ pub struct BigInt;
 
 impl IntrinsicObject for BigInt {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         BuiltInBuilder::from_standard_constructor::<Self>(realm)
-            .method(Self::to_string, "toString", 0)
-            .method(Self::value_of, "valueOf", 0)
-            .static_method(Self::as_int_n, "asIntN", 2)
-            .static_method(Self::as_uint_n, "asUintN", 2)
+            .method(Self::to_string, js_string!("toString"), 0)
+            .method(Self::value_of, js_string!("valueOf"), 0)
+            .static_method(Self::as_int_n, js_string!("asIntN"), 2)
+            .static_method(Self::as_uint_n, js_string!("asUintN"), 2)
             .property(
                 JsSymbol::to_string_tag(),
                 Self::NAME,
@@ -58,7 +60,7 @@ impl IntrinsicObject for BigInt {
 }
 
 impl BuiltInObject for BigInt {
-    const NAME: &'static str = "BigInt";
+    const NAME: JsString = StaticJsStrings::BIG_INT;
 }
 
 impl BuiltInConstructor for BigInt {
@@ -179,7 +181,7 @@ impl BigInt {
         let radix_mv = if radix.is_undefined() {
             // 5. If radixMV = 10, return ! ToString(x).
             // Note: early return optimization.
-            return Ok(x.to_string().into());
+            return Ok(js_string!(x.to_string()).into());
         // 3. Else, let radixMV be ? ToIntegerOrInfinity(radix).
         } else {
             radix.to_integer_or_infinity(context)?
@@ -197,14 +199,14 @@ impl BigInt {
 
         // 5. If radixMV = 10, return ! ToString(x).
         if radix_mv == 10 {
-            return Ok(x.to_string().into());
+            return Ok(js_string!(x.to_string()).into());
         }
 
         // 1. Let x be ? thisBigIntValue(this value).
         // 6. Return the String representation of this Number value using the radix specified by radixMV.
         //    Letters a-z are used for digits with values 10 through 35.
         //    The precise algorithm is implementation-defined, however the algorithm should be a generalization of that specified in 6.1.6.2.23.
-        Ok(JsValue::new(x.to_string_radix(radix_mv as u32)))
+        Ok(JsValue::new(js_string!(x.to_string_radix(radix_mv as u32))))
     }
 
     /// `BigInt.prototype.valueOf()`

boa_engine/src/builtins/bigint/tests.rs

@@ -1,4 +1,4 @@
-use crate::{run_test_actions, JsBigInt, JsNativeErrorKind, TestAction};
+use crate::{js_string, run_test_actions, JsBigInt, JsNativeErrorKind, TestAction};
 
 #[test]
 fn equality() {
@@ -147,10 +147,10 @@ fn operations() {
 #[test]
 fn to_string() {
     run_test_actions([
-        TestAction::assert_eq("1000n.toString()", "1000"),
-        TestAction::assert_eq("1000n.toString(2)", "1111101000"),
-        TestAction::assert_eq("255n.toString(16)", "ff"),
-        TestAction::assert_eq("1000n.toString(36)", "rs"),
+        TestAction::assert_eq("1000n.toString()", js_string!("1000")),
+        TestAction::assert_eq("1000n.toString(2)", js_string!("1111101000")),
+        TestAction::assert_eq("255n.toString(16)", js_string!("ff")),
+        TestAction::assert_eq("1000n.toString(36)", js_string!("rs")),
     ]);
 }
 

boa_engine/src/builtins/boolean/mod.rs

@@ -16,9 +16,11 @@ use crate::{
     builtins::BuiltInObject,
     context::intrinsics::{Intrinsics, StandardConstructor, StandardConstructors},
     error::JsNativeError,
+    js_string,
     object::{internal_methods::get_prototype_from_constructor, JsObject, ObjectData},
     realm::Realm,
-    Context, JsResult, JsValue,
+    string::common::StaticJsStrings,
+    Context, JsResult, JsString, JsValue,
 };
 use boa_profiler::Profiler;
 
@@ -30,11 +32,11 @@ pub(crate) struct Boolean;
 
 impl IntrinsicObject for Boolean {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         BuiltInBuilder::from_standard_constructor::<Self>(realm)
-            .method(Self::to_string, "toString", 0)
-            .method(Self::value_of, "valueOf", 0)
+            .method(Self::to_string, js_string!("toString"), 0)
+            .method(Self::value_of, js_string!("valueOf"), 0)
             .build();
     }
 
@@ -44,7 +46,7 @@ impl IntrinsicObject for Boolean {
 }
 
 impl BuiltInObject for Boolean {
-    const NAME: &'static str = "Boolean";
+    const NAME: JsString = StaticJsStrings::BOOLEAN;
 }
 
 impl BuiltInConstructor for Boolean {
@@ -111,7 +113,7 @@ impl Boolean {
         _: &mut Context<'_>,
     ) -> JsResult<JsValue> {
         let boolean = Self::this_boolean_value(this)?;
-        Ok(JsValue::new(boolean.to_string()))
+        Ok(JsValue::new(js_string!(boolean.to_string())))
     }
 
     /// The valueOf() method returns the primitive value of a `Boolean` object.

boa_engine/src/builtins/dataview/mod.rs

@@ -11,13 +11,14 @@ use crate::{
     builtins::{array_buffer::SharedMemoryOrder, typed_array::TypedArrayKind, BuiltInObject},
     context::intrinsics::{Intrinsics, StandardConstructor, StandardConstructors},
     error::JsNativeError,
+    js_string,
     object::{internal_methods::get_prototype_from_constructor, JsObject, ObjectData},
     property::Attribute,
     realm::Realm,
-    string::utf16,
+    string::common::StaticJsStrings,
     symbol::JsSymbol,
     value::JsValue,
-    Context, JsArgs, JsResult,
+    Context, JsArgs, JsResult, JsString,
 };
 use boa_gc::{Finalize, Trace};
 
@@ -36,51 +37,56 @@ impl IntrinsicObject for DataView {
         let flag_attributes = Attribute::CONFIGURABLE | Attribute::NON_ENUMERABLE;
 
         let get_buffer = BuiltInBuilder::callable(realm, Self::get_buffer)
-            .name("get buffer")
+            .name(js_string!("get buffer"))
             .build();
 
         let get_byte_length = BuiltInBuilder::callable(realm, Self::get_byte_length)
-            .name("get byteLength")
+            .name(js_string!("get byteLength"))
             .build();
 
         let get_byte_offset = BuiltInBuilder::callable(realm, Self::get_byte_offset)
-            .name("get byteOffset")
+            .name(js_string!("get byteOffset"))
             .build();
 
         BuiltInBuilder::from_standard_constructor::<Self>(realm)
-            .accessor(utf16!("buffer"), Some(get_buffer), None, flag_attributes)
             .accessor(
-                utf16!("byteLength"),
+                js_string!("buffer"),
+                Some(get_buffer),
+                None,
+                flag_attributes,
+            )
+            .accessor(
+                js_string!("byteLength"),
                 Some(get_byte_length),
                 None,
                 flag_attributes,
             )
             .accessor(
-                utf16!("byteOffset"),
+                js_string!("byteOffset"),
                 Some(get_byte_offset),
                 None,
                 flag_attributes,
             )
-            .method(Self::get_big_int64, "getBigInt64", 1)
-            .method(Self::get_big_uint64, "getBigUint64", 1)
-            .method(Self::get_float32, "getFloat32", 1)
-            .method(Self::get_float64, "getFloat64", 1)
-            .method(Self::get_int8, "getInt8", 1)
-            .method(Self::get_int16, "getInt16", 1)
-            .method(Self::get_int32, "getInt32", 1)
-            .method(Self::get_uint8, "getUint8", 1)
-            .method(Self::get_uint16, "getUint16", 1)
-            .method(Self::get_uint32, "getUint32", 1)
-            .method(Self::set_big_int64, "setBigInt64", 2)
-            .method(Self::set_big_uint64, "setBigUint64", 2)
-            .method(Self::set_float32, "setFloat32", 2)
-            .method(Self::set_float64, "setFloat64", 2)
-            .method(Self::set_int8, "setInt8", 2)
-            .method(Self::set_int16, "setInt16", 2)
-            .method(Self::set_int32, "setInt32", 2)
-            .method(Self::set_uint8, "setUint8", 2)
-            .method(Self::set_uint16, "setUint16", 2)
-            .method(Self::set_uint32, "setUint32", 2)
+            .method(Self::get_big_int64, js_string!("getBigInt64"), 1)
+            .method(Self::get_big_uint64, js_string!("getBigUint64"), 1)
+            .method(Self::get_float32, js_string!("getFloat32"), 1)
+            .method(Self::get_float64, js_string!("getFloat64"), 1)
+            .method(Self::get_int8, js_string!("getInt8"), 1)
+            .method(Self::get_int16, js_string!("getInt16"), 1)
+            .method(Self::get_int32, js_string!("getInt32"), 1)
+            .method(Self::get_uint8, js_string!("getUint8"), 1)
+            .method(Self::get_uint16, js_string!("getUint16"), 1)
+            .method(Self::get_uint32, js_string!("getUint32"), 1)
+            .method(Self::set_big_int64, js_string!("setBigInt64"), 2)
+            .method(Self::set_big_uint64, js_string!("setBigUint64"), 2)
+            .method(Self::set_float32, js_string!("setFloat32"), 2)
+            .method(Self::set_float64, js_string!("setFloat64"), 2)
+            .method(Self::set_int8, js_string!("setInt8"), 2)
+            .method(Self::set_int16, js_string!("setInt16"), 2)
+            .method(Self::set_int32, js_string!("setInt32"), 2)
+            .method(Self::set_uint8, js_string!("setUint8"), 2)
+            .method(Self::set_uint16, js_string!("setUint16"), 2)
+            .method(Self::set_uint32, js_string!("setUint32"), 2)
             .property(
                 JsSymbol::to_string_tag(),
                 Self::NAME,
@@ -95,7 +101,7 @@ impl IntrinsicObject for DataView {
 }
 
 impl BuiltInObject for DataView {
-    const NAME: &'static str = "DataView";
+    const NAME: JsString = StaticJsStrings::DATA_VIEW;
 }
 
 impl BuiltInConstructor for DataView {

boa_engine/src/builtins/date/mod.rs

@@ -24,10 +24,10 @@ use crate::{
     object::{internal_methods::get_prototype_from_constructor, JsObject, ObjectData},
     property::Attribute,
     realm::Realm,
-    string::utf16,
+    string::{common::StaticJsStrings, utf16},
     symbol::JsSymbol,
     value::{IntegerOrNan, JsValue, PreferredType},
-    Context, JsArgs, JsError, JsResult,
+    Context, JsArgs, JsError, JsResult, JsString,
 };
 use boa_profiler::Profiler;
 use chrono::prelude::*;
@@ -94,73 +94,109 @@ impl Date {
 
 impl IntrinsicObject for Date {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         let to_utc_string = BuiltInBuilder::callable(realm, Self::to_utc_string)
-            .name("toUTCString")
+            .name(js_string!("toUTCString"))
             .length(0)
             .build();
 
         let to_primitive = BuiltInBuilder::callable(realm, Self::to_primitive)
-            .name("[Symbol.toPrimitive]")
+            .name(js_string!("[Symbol.toPrimitive]"))
             .length(1)
             .build();
 
         BuiltInBuilder::from_standard_constructor::<Self>(realm)
-            .static_method(Self::now, "now", 0)
-            .static_method(Self::parse, "parse", 1)
-            .static_method(Self::utc, "UTC", 7)
-            .method(Self::get_date::<true>, "getDate", 0)
-            .method(Self::get_day::<true>, "getDay", 0)
-            .method(Self::get_full_year::<true>, "getFullYear", 0)
-            .method(Self::get_hours::<true>, "getHours", 0)
-            .method(Self::get_milliseconds::<true>, "getMilliseconds", 0)
-            .method(Self::get_minutes::<true>, "getMinutes", 0)
-            .method(Self::get_month::<true>, "getMonth", 0)
-            .method(Self::get_seconds::<true>, "getSeconds", 0)
-            .method(Self::get_time, "getTime", 0)
-            .method(Self::get_timezone_offset, "getTimezoneOffset", 0)
-            .method(Self::get_date::<false>, "getUTCDate", 0)
-            .method(Self::get_day::<false>, "getUTCDay", 0)
-            .method(Self::get_full_year::<false>, "getUTCFullYear", 0)
-            .method(Self::get_hours::<false>, "getUTCHours", 0)
-            .method(Self::get_milliseconds::<false>, "getUTCMilliseconds", 0)
-            .method(Self::get_minutes::<false>, "getUTCMinutes", 0)
-            .method(Self::get_month::<false>, "getUTCMonth", 0)
-            .method(Self::get_seconds::<false>, "getUTCSeconds", 0)
-            .method(Self::get_year, "getYear", 0)
-            .method(Self::set_date::<true>, "setDate", 1)
-            .method(Self::set_full_year::<true>, "setFullYear", 3)
-            .method(Self::set_hours::<true>, "setHours", 4)
-            .method(Self::set_milliseconds::<true>, "setMilliseconds", 1)
-            .method(Self::set_minutes::<true>, "setMinutes", 3)
-            .method(Self::set_month::<true>, "setMonth", 2)
-            .method(Self::set_seconds::<true>, "setSeconds", 2)
-            .method(Self::set_time, "setTime", 1)
-            .method(Self::set_date::<false>, "setUTCDate", 1)
-            .method(Self::set_full_year::<false>, "setUTCFullYear", 3)
-            .method(Self::set_hours::<false>, "setUTCHours", 4)
-            .method(Self::set_milliseconds::<false>, "setUTCMilliseconds", 1)
-            .method(Self::set_minutes::<false>, "setUTCMinutes", 3)
-            .method(Self::set_month::<false>, "setUTCMonth", 2)
-            .method(Self::set_seconds::<false>, "setUTCSeconds", 2)
-            .method(Self::set_year, "setYear", 1)
-            .method(Self::to_date_string, "toDateString", 0)
-            .method(Self::to_iso_string, "toISOString", 0)
-            .method(Self::to_json, "toJSON", 1)
-            .method(Self::to_locale_date_string, "toLocaleDateString", 0)
-            .method(Self::to_locale_string, "toLocaleString", 0)
-            .method(Self::to_locale_time_string, "toLocaleTimeString", 0)
-            .method(Self::to_string, "toString", 0)
-            .method(Self::to_time_string, "toTimeString", 0)
-            .method(Self::value_of, "valueOf", 0)
+            .static_method(Self::now, js_string!("now"), 0)
+            .static_method(Self::parse, js_string!("parse"), 1)
+            .static_method(Self::utc, js_string!("UTC"), 7)
+            .method(Self::get_date::<true>, js_string!("getDate"), 0)
+            .method(Self::get_day::<true>, js_string!("getDay"), 0)
+            .method(Self::get_full_year::<true>, js_string!("getFullYear"), 0)
+            .method(Self::get_hours::<true>, js_string!("getHours"), 0)
+            .method(
+                Self::get_milliseconds::<true>,
+                js_string!("getMilliseconds"),
+                0,
+            )
+            .method(Self::get_minutes::<true>, js_string!("getMinutes"), 0)
+            .method(Self::get_month::<true>, js_string!("getMonth"), 0)
+            .method(Self::get_seconds::<true>, js_string!("getSeconds"), 0)
+            .method(Self::get_time, js_string!("getTime"), 0)
+            .method(
+                Self::get_timezone_offset,
+                js_string!("getTimezoneOffset"),
+                0,
+            )
+            .method(Self::get_date::<false>, js_string!("getUTCDate"), 0)
+            .method(Self::get_day::<false>, js_string!("getUTCDay"), 0)
+            .method(
+                Self::get_full_year::<false>,
+                js_string!("getUTCFullYear"),
+                0,
+            )
+            .method(Self::get_hours::<false>, js_string!("getUTCHours"), 0)
+            .method(
+                Self::get_milliseconds::<false>,
+                js_string!("getUTCMilliseconds"),
+                0,
+            )
+            .method(Self::get_minutes::<false>, js_string!("getUTCMinutes"), 0)
+            .method(Self::get_month::<false>, js_string!("getUTCMonth"), 0)
+            .method(Self::get_seconds::<false>, js_string!("getUTCSeconds"), 0)
+            .method(Self::get_year, js_string!("getYear"), 0)
+            .method(Self::set_date::<true>, js_string!("setDate"), 1)
+            .method(Self::set_full_year::<true>, js_string!("setFullYear"), 3)
+            .method(Self::set_hours::<true>, js_string!("setHours"), 4)
+            .method(
+                Self::set_milliseconds::<true>,
+                js_string!("setMilliseconds"),
+                1,
+            )
+            .method(Self::set_minutes::<true>, js_string!("setMinutes"), 3)
+            .method(Self::set_month::<true>, js_string!("setMonth"), 2)
+            .method(Self::set_seconds::<true>, js_string!("setSeconds"), 2)
+            .method(Self::set_time, js_string!("setTime"), 1)
+            .method(Self::set_date::<false>, js_string!("setUTCDate"), 1)
+            .method(
+                Self::set_full_year::<false>,
+                js_string!("setUTCFullYear"),
+                3,
+            )
+            .method(Self::set_hours::<false>, js_string!("setUTCHours"), 4)
+            .method(
+                Self::set_milliseconds::<false>,
+                js_string!("setUTCMilliseconds"),
+                1,
+            )
+            .method(Self::set_minutes::<false>, js_string!("setUTCMinutes"), 3)
+            .method(Self::set_month::<false>, js_string!("setUTCMonth"), 2)
+            .method(Self::set_seconds::<false>, js_string!("setUTCSeconds"), 2)
+            .method(Self::set_year, js_string!("setYear"), 1)
+            .method(Self::to_date_string, js_string!("toDateString"), 0)
+            .method(Self::to_iso_string, js_string!("toISOString"), 0)
+            .method(Self::to_json, js_string!("toJSON"), 1)
+            .method(
+                Self::to_locale_date_string,
+                js_string!("toLocaleDateString"),
+                0,
+            )
+            .method(Self::to_locale_string, js_string!("toLocaleString"), 0)
+            .method(
+                Self::to_locale_time_string,
+                js_string!("toLocaleTimeString"),
+                0,
+            )
+            .method(Self::to_string, js_string!("toString"), 0)
+            .method(Self::to_time_string, js_string!("toTimeString"), 0)
+            .method(Self::value_of, js_string!("valueOf"), 0)
             .property(
-                "toGMTString",
+                js_string!("toGMTString"),
                 to_utc_string.clone(),
                 Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE,
             )
             .property(
-                "toUTCString",
+                js_string!("toUTCString"),
                 to_utc_string,
                 Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE,
             )
@@ -178,7 +214,7 @@ impl IntrinsicObject for Date {
 }
 
 impl BuiltInObject for Date {
-    const NAME: &'static str = "Date";
+    const NAME: JsString = StaticJsStrings::DATE;
 }
 
 impl BuiltInConstructor for Date {
@@ -205,13 +241,11 @@ impl BuiltInConstructor for Date {
         if new_target.is_undefined() {
             // a. Let now be the time value (UTC) identifying the current time.
             // b. Return ToDateString(now).
-            return Ok(JsValue::new(
-                context
+            return Ok(JsValue::new(js_string!(context
                 .host_hooks()
                 .local_from_utc(context.host_hooks().utc_now())
                 .format("%a %b %d %Y %H:%M:%S GMT%:z")
-                    .to_string(),
-            ));
+                .to_string())));
         }
         // 2. Let numberOfArgs be the number of elements in values.
         let dv = match args {
@@ -1253,11 +1287,11 @@ impl Date {
 
         // 4. Let t be LocalTime(tv).
         // 5. Return DateString(t).
-        Ok(context
+        Ok(js_string!(context
             .host_hooks()
             .local_from_utc(tv)
             .format("%a %b %d %Y")
-            .to_string()
+            .to_string())
         .into())
     }
 
@@ -1280,10 +1314,10 @@ impl Date {
         let t = this_time_value(this)?
             .and_then(NaiveDateTime::from_timestamp_millis)
             .ok_or_else(|| JsNativeError::range().with_message("Invalid time value"))?;
-        Ok(Utc
+        Ok(js_string!(Utc
             .from_utc_datetime(&t)
             .format("%Y-%m-%dT%H:%M:%S.%3fZ")
-            .to_string()
+            .to_string())
         .into())
     }
 
@@ -1334,7 +1368,9 @@ impl Date {
         _args: &[JsValue],
         _context: &mut Context<'_>,
     ) -> JsResult<JsValue> {
-        Err(JsError::from_opaque(JsValue::new("Function Unimplemented")))
+        Err(JsError::from_opaque(JsValue::new(js_string!(
+            "Function Unimplemented"
+        ))))
     }
 
     /// [`Date.prototype.toLocaleString()`][spec].
@@ -1351,9 +1387,9 @@ impl Date {
         _: &[JsValue],
         _context: &mut Context<'_>,
     ) -> JsResult<JsValue> {
-        Err(JsError::from_opaque(JsValue::new(
-            "Function Unimplemented]",
-        )))
+        Err(JsError::from_opaque(JsValue::new(js_string!(
+            "Function Unimplemented]"
+        ))))
     }
 
     /// [`Date.prototype.toLocaleTimeString()`][spec].
@@ -1371,9 +1407,9 @@ impl Date {
         _args: &[JsValue],
         _context: &mut Context<'_>,
     ) -> JsResult<JsValue> {
-        Err(JsError::from_opaque(JsValue::new(
-            "Function Unimplemented]",
-        )))
+        Err(JsError::from_opaque(JsValue::new(js_string!(
+            "Function Unimplemented]"
+        ))))
     }
 
     /// [`Date.prototype.toString()`][spec].
@@ -1395,11 +1431,11 @@ impl Date {
         let Some(tv) = this_time_value(this)?.and_then(NaiveDateTime::from_timestamp_millis) else {
             return Ok(js_string!("Invalid Date").into());
         };
-        Ok(context
+        Ok(js_string!(context
             .host_hooks()
             .local_from_utc(tv)
             .format("%a %b %d %Y %H:%M:%S GMT%z")
-            .to_string()
+            .to_string())
         .into())
     }
 
@@ -1427,11 +1463,11 @@ impl Date {
 
         // 4. Let t be LocalTime(tv).
         // 5. Return the string-concatenation of TimeString(t) and TimeZoneString(tv).
-        Ok(context
+        Ok(js_string!(context
             .host_hooks()
             .local_from_utc(tv)
             .format("%H:%M:%S GMT%z")
-            .to_string()
+            .to_string())
         .into())
     }
 
@@ -1466,7 +1502,7 @@ impl Date {
         // code unit 0x0020 (SPACE), month, the code unit 0x0020 (SPACE), yearSign, paddedYear, the code
         // unit 0x0020 (SPACE), and TimeString(tv)
         let utc_string = t.format("%a, %d %b %Y %H:%M:%S GMT").to_string();
-        Ok(JsValue::new(utc_string))
+        Ok(JsValue::new(js_string!(utc_string)))
     }
 
     /// [`Date.prototype.valueOf()`][spec].

boa_engine/src/builtins/date/tests.rs

@@ -1,4 +1,4 @@
-use crate::{run_test_actions, JsNativeErrorKind, TestAction};
+use crate::{js_string, run_test_actions, JsNativeErrorKind, TestAction};
 use chrono::{Local, NaiveDate, NaiveDateTime, NaiveTime, TimeZone};
 use indoc::indoc;
 
@@ -762,7 +762,7 @@ fn date_proto_set_utc_seconds() {
 fn date_proto_to_date_string() {
     run_test_actions([TestAction::assert_eq(
         "new Date(2020, 6, 8, 9, 16, 15, 779).toDateString()",
-        "Wed Jul 08 2020",
+        js_string!("Wed Jul 08 2020"),
     )]);
 }
 
@@ -770,7 +770,7 @@ fn date_proto_to_date_string() {
 fn date_proto_to_gmt_string() {
     run_test_actions([TestAction::assert_eq(
         "new Date(Date.UTC(2020, 6, 8, 9, 16, 15, 779)).toGMTString()",
-        "Wed, 08 Jul 2020 09:16:15 GMT",
+        js_string!("Wed, 08 Jul 2020 09:16:15 GMT"),
     )]);
 }
 
@@ -778,7 +778,7 @@ fn date_proto_to_gmt_string() {
 fn date_proto_to_iso_string() {
     run_test_actions([TestAction::assert_eq(
         "new Date(Date.UTC(2020, 6, 8, 9, 16, 15, 779)).toISOString()",
-        "2020-07-08T09:16:15.779Z",
+        js_string!("2020-07-08T09:16:15.779Z"),
     )]);
 }
 
@@ -786,7 +786,7 @@ fn date_proto_to_iso_string() {
 fn date_proto_to_json() {
     run_test_actions([TestAction::assert_eq(
         "new Date(Date.UTC(2020, 6, 8, 9, 16, 15, 779)).toJSON()",
-        "2020-07-08T09:16:15.779Z",
+        js_string!("2020-07-08T09:16:15.779Z"),
     )]);
 }
 
@@ -794,7 +794,7 @@ fn date_proto_to_json() {
 fn date_proto_to_string() {
     run_test_actions([TestAction::assert_eq(
         "new Date(2020, 6, 8, 9, 16, 15, 779).toString()",
-        Local
+        js_string!(Local
             .from_local_datetime(&NaiveDateTime::new(
                 NaiveDate::from_ymd_opt(2020, 7, 8).unwrap(),
                 NaiveTime::from_hms_milli_opt(9, 16, 15, 779).unwrap(),
@@ -802,7 +802,7 @@ fn date_proto_to_string() {
             .earliest()
             .unwrap()
             .format("Wed Jul 08 2020 09:16:15 GMT%z")
-            .to_string(),
+            .to_string()),
     )]);
 }
 
@@ -810,7 +810,7 @@ fn date_proto_to_string() {
 fn date_proto_to_time_string() {
     run_test_actions([TestAction::assert_eq(
         "new Date(2020, 6, 8, 9, 16, 15, 779).toTimeString()",
-        Local
+        js_string!(Local
             .from_local_datetime(&NaiveDateTime::new(
                 NaiveDate::from_ymd_opt(2020, 7, 8).unwrap(),
                 NaiveTime::from_hms_milli_opt(9, 16, 15, 779).unwrap(),
@@ -818,7 +818,7 @@ fn date_proto_to_time_string() {
             .earliest()
             .unwrap()
             .format("09:16:15 GMT%z")
-            .to_string(),
+            .to_string()),
     )]);
 }
 
@@ -826,7 +826,7 @@ fn date_proto_to_time_string() {
 fn date_proto_to_utc_string() {
     run_test_actions([TestAction::assert_eq(
         "new Date(Date.UTC(2020, 6, 8, 9, 16, 15, 779)).toUTCString()",
-        "Wed, 08 Jul 2020 09:16:15 GMT",
+        js_string!("Wed, 08 Jul 2020 09:16:15 GMT"),
     )]);
 }
 
@@ -850,6 +850,6 @@ fn date_neg() {
 fn date_json() {
     run_test_actions([TestAction::assert_eq(
         "JSON.stringify({ date: new Date(Date.UTC(2020, 6, 8, 9, 16, 15, 779)) })",
-        r#"{"date":"2020-07-08T09:16:15.779Z"}"#,
+        js_string!(r#"{"date":"2020-07-08T09:16:15.779Z"}"#),
     )]);
 }

boa_engine/src/builtins/error/aggregate.rs

@@ -13,11 +13,12 @@ use crate::{
         IntrinsicObject,
     },
     context::intrinsics::{Intrinsics, StandardConstructor, StandardConstructors},
+    js_string,
     object::{internal_methods::get_prototype_from_constructor, JsObject, ObjectData},
     property::{Attribute, PropertyDescriptorBuilder},
     realm::Realm,
-    string::utf16,
-    Context, JsArgs, JsResult, JsValue,
+    string::{common::StaticJsStrings, utf16},
+    Context, JsArgs, JsResult, JsString, JsValue,
 };
 use boa_profiler::Profiler;
 
@@ -28,14 +29,14 @@ pub(crate) struct AggregateError;
 
 impl IntrinsicObject for AggregateError {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         let attribute = Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE;
         BuiltInBuilder::from_standard_constructor::<Self>(realm)
             .prototype(realm.intrinsics().constructors().error().constructor())
             .inherits(Some(realm.intrinsics().constructors().error().prototype()))
             .property(utf16!("name"), Self::NAME, attribute)
-            .property(utf16!("message"), "", attribute)
+            .property(utf16!("message"), js_string!(), attribute)
             .build();
     }
 
@@ -45,7 +46,7 @@ impl IntrinsicObject for AggregateError {
 }
 
 impl BuiltInObject for AggregateError {
-    const NAME: &'static str = "AggregateError";
+    const NAME: JsString = StaticJsStrings::AGGREGATE_ERROR;
 }
 
 impl BuiltInConstructor for AggregateError {

boa_engine/src/builtins/error/eval.rs

@@ -14,11 +14,12 @@
 use crate::{
     builtins::{BuiltInBuilder, BuiltInConstructor, BuiltInObject, IntrinsicObject},
     context::intrinsics::{Intrinsics, StandardConstructor, StandardConstructors},
+    js_string,
     object::{internal_methods::get_prototype_from_constructor, JsObject, ObjectData},
     property::Attribute,
     realm::Realm,
-    string::utf16,
-    Context, JsArgs, JsResult, JsValue,
+    string::{common::StaticJsStrings, utf16},
+    Context, JsArgs, JsResult, JsString, JsValue,
 };
 use boa_profiler::Profiler;
 
@@ -30,14 +31,14 @@ pub(crate) struct EvalError;
 
 impl IntrinsicObject for EvalError {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         let attribute = Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE;
         BuiltInBuilder::from_standard_constructor::<Self>(realm)
             .prototype(realm.intrinsics().constructors().error().constructor())
             .inherits(Some(realm.intrinsics().constructors().error().prototype()))
             .property(utf16!("name"), Self::NAME, attribute)
-            .property(utf16!("message"), "", attribute)
+            .property(utf16!("message"), js_string!(), attribute)
             .build();
     }
 
@@ -47,7 +48,7 @@ impl IntrinsicObject for EvalError {
 }
 
 impl BuiltInObject for EvalError {
-    const NAME: &'static str = "EvalError";
+    const NAME: JsString = StaticJsStrings::EVAL_ERROR;
 }
 
 impl BuiltInConstructor for EvalError {

boa_engine/src/builtins/error/mod.rs

@@ -18,8 +18,8 @@ use crate::{
     object::{internal_methods::get_prototype_from_constructor, JsObject, ObjectData},
     property::Attribute,
     realm::Realm,
-    string::utf16,
-    Context, JsArgs, JsResult, JsValue,
+    string::{common::StaticJsStrings, utf16},
+    Context, JsArgs, JsResult, JsString, JsValue,
 };
 use boa_profiler::Profiler;
 
@@ -129,13 +129,13 @@ pub(crate) struct Error;
 
 impl IntrinsicObject for Error {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         let attribute = Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE;
         BuiltInBuilder::from_standard_constructor::<Self>(realm)
             .property(utf16!("name"), Self::NAME, attribute)
-            .property(utf16!("message"), "", attribute)
-            .method(Self::to_string, "toString", 0)
+            .property(utf16!("message"), js_string!(), attribute)
+            .method(Self::to_string, js_string!("toString"), 0)
             .build();
     }
 
@@ -145,7 +145,7 @@ impl IntrinsicObject for Error {
 }
 
 impl BuiltInObject for Error {
-    const NAME: &'static str = "Error";
+    const NAME: JsString = StaticJsStrings::ERROR;
 }
 
 impl BuiltInConstructor for Error {

boa_engine/src/builtins/error/range.rs

@@ -12,11 +12,12 @@
 use crate::{
     builtins::{BuiltInBuilder, BuiltInConstructor, BuiltInObject, IntrinsicObject},
     context::intrinsics::{Intrinsics, StandardConstructor, StandardConstructors},
+    js_string,
     object::{internal_methods::get_prototype_from_constructor, JsObject, ObjectData},
     property::Attribute,
     realm::Realm,
-    string::utf16,
-    Context, JsArgs, JsResult, JsValue,
+    string::{common::StaticJsStrings, utf16},
+    Context, JsArgs, JsResult, JsString, JsValue,
 };
 use boa_profiler::Profiler;
 
@@ -28,14 +29,14 @@ pub(crate) struct RangeError;
 
 impl IntrinsicObject for RangeError {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         let attribute = Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE;
         BuiltInBuilder::from_standard_constructor::<Self>(realm)
             .prototype(realm.intrinsics().constructors().error().constructor())
             .inherits(Some(realm.intrinsics().constructors().error().prototype()))
             .property(utf16!("name"), Self::NAME, attribute)
-            .property(utf16!("message"), "", attribute)
+            .property(utf16!("message"), js_string!(), attribute)
             .build();
     }
 
@@ -45,7 +46,7 @@ impl IntrinsicObject for RangeError {
 }
 
 impl BuiltInObject for RangeError {
-    const NAME: &'static str = "RangeError";
+    const NAME: JsString = StaticJsStrings::RANGE_ERROR;
 }
 
 impl BuiltInConstructor for RangeError {

boa_engine/src/builtins/error/reference.rs

@@ -12,11 +12,12 @@
 use crate::{
     builtins::{BuiltInBuilder, BuiltInConstructor, BuiltInObject, IntrinsicObject},
     context::intrinsics::{Intrinsics, StandardConstructor, StandardConstructors},
+    js_string,
     object::{internal_methods::get_prototype_from_constructor, JsObject, ObjectData},
     property::Attribute,
     realm::Realm,
-    string::utf16,
-    Context, JsArgs, JsResult, JsValue,
+    string::{common::StaticJsStrings, utf16},
+    Context, JsArgs, JsResult, JsString, JsValue,
 };
 use boa_profiler::Profiler;
 
@@ -27,14 +28,14 @@ pub(crate) struct ReferenceError;
 
 impl IntrinsicObject for ReferenceError {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         let attribute = Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE;
         BuiltInBuilder::from_standard_constructor::<Self>(realm)
             .prototype(realm.intrinsics().constructors().error().constructor())
             .inherits(Some(realm.intrinsics().constructors().error().prototype()))
-            .property(utf16!("name"), Self::NAME, attribute)
-            .property(utf16!("message"), "", attribute)
+            .property(js_string!("name"), Self::NAME, attribute)
+            .property(js_string!("message"), js_string!(), attribute)
             .build();
     }
 
@@ -44,7 +45,7 @@ impl IntrinsicObject for ReferenceError {
 }
 
 impl BuiltInObject for ReferenceError {
-    const NAME: &'static str = "ReferenceError";
+    const NAME: JsString = StaticJsStrings::REFERENCE_ERROR;
 }
 
 impl BuiltInConstructor for ReferenceError {

boa_engine/src/builtins/error/syntax.rs

@@ -14,11 +14,12 @@
 use crate::{
     builtins::{BuiltInBuilder, BuiltInConstructor, BuiltInObject, IntrinsicObject},
     context::intrinsics::{Intrinsics, StandardConstructor, StandardConstructors},
+    js_string,
     object::{internal_methods::get_prototype_from_constructor, JsObject, ObjectData},
     property::Attribute,
     realm::Realm,
-    string::utf16,
-    Context, JsArgs, JsResult, JsValue,
+    string::{common::StaticJsStrings, utf16},
+    Context, JsArgs, JsResult, JsString, JsValue,
 };
 use boa_profiler::Profiler;
 
@@ -30,14 +31,14 @@ pub(crate) struct SyntaxError;
 
 impl IntrinsicObject for SyntaxError {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         let attribute = Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE;
         BuiltInBuilder::from_standard_constructor::<Self>(realm)
             .prototype(realm.intrinsics().constructors().error().constructor())
             .inherits(Some(realm.intrinsics().constructors().error().prototype()))
             .property(utf16!("name"), Self::NAME, attribute)
-            .property(utf16!("message"), "", attribute)
+            .property(utf16!("message"), js_string!(), attribute)
             .build();
     }
 
@@ -47,7 +48,7 @@ impl IntrinsicObject for SyntaxError {
 }
 
 impl BuiltInObject for SyntaxError {
-    const NAME: &'static str = "SyntaxError";
+    const NAME: JsString = StaticJsStrings::SYNTAX_ERROR;
 }
 
 impl BuiltInConstructor for SyntaxError {

boa_engine/src/builtins/error/tests.rs

@@ -1,24 +1,42 @@
-use crate::{run_test_actions, TestAction};
+use crate::{js_string, run_test_actions, TestAction};
 use indoc::indoc;
 
 #[test]
 fn error_to_string() {
     run_test_actions([
-        TestAction::assert_eq("(new Error('1')).toString()", "Error: 1"),
-        TestAction::assert_eq("(new RangeError('2')).toString()", "RangeError: 2"),
-        TestAction::assert_eq("(new ReferenceError('3')).toString()", "ReferenceError: 3"),
-        TestAction::assert_eq("(new SyntaxError('4')).toString()", "SyntaxError: 4"),
-        TestAction::assert_eq("(new TypeError('5')).toString()", "TypeError: 5"),
-        TestAction::assert_eq("(new EvalError('6')).toString()", "EvalError: 6"),
-        TestAction::assert_eq("(new URIError('7')).toString()", "URIError: 7"),
+        TestAction::assert_eq("(new Error('1')).toString()", js_string!("Error: 1")),
+        TestAction::assert_eq(
+            "(new RangeError('2')).toString()",
+            js_string!("RangeError: 2"),
+        ),
+        TestAction::assert_eq(
+            "(new ReferenceError('3')).toString()",
+            js_string!("ReferenceError: 3"),
+        ),
+        TestAction::assert_eq(
+            "(new SyntaxError('4')).toString()",
+            js_string!("SyntaxError: 4"),
+        ),
+        TestAction::assert_eq(
+            "(new TypeError('5')).toString()",
+            js_string!("TypeError: 5"),
+        ),
+        TestAction::assert_eq(
+            "(new EvalError('6')).toString()",
+            js_string!("EvalError: 6"),
+        ),
+        TestAction::assert_eq("(new URIError('7')).toString()", js_string!("URIError: 7")),
         // no message
-        TestAction::assert_eq("(new Error()).toString()", "Error"),
-        TestAction::assert_eq("(new RangeError()).toString()", "RangeError"),
-        TestAction::assert_eq("(new ReferenceError()).toString()", "ReferenceError"),
-        TestAction::assert_eq("(new SyntaxError()).toString()", "SyntaxError"),
-        TestAction::assert_eq("(new TypeError()).toString()", "TypeError"),
-        TestAction::assert_eq("(new EvalError()).toString()", "EvalError"),
-        TestAction::assert_eq("(new URIError()).toString()", "URIError"),
+        TestAction::assert_eq("(new Error()).toString()", js_string!("Error")),
+        TestAction::assert_eq("(new RangeError()).toString()", js_string!("RangeError")),
+        TestAction::assert_eq(
+            "(new ReferenceError()).toString()",
+            js_string!("ReferenceError"),
+        ),
+        TestAction::assert_eq("(new SyntaxError()).toString()", js_string!("SyntaxError")),
+        TestAction::assert_eq("(new TypeError()).toString()", js_string!("TypeError")),
+        TestAction::assert_eq("(new EvalError()).toString()", js_string!("EvalError")),
+        TestAction::assert_eq("(new URIError()).toString()", js_string!("URIError")),
         // no name
         TestAction::assert_eq(
             indoc! {r#"
@@ -26,7 +44,7 @@ fn error_to_string() {
                 message.name = '';
                 message.toString()
             "#},
-            "message",
+            js_string!("message"),
         ),
     ]);
 }
@@ -34,14 +52,14 @@ fn error_to_string() {
 #[test]
 fn error_names() {
     run_test_actions([
-        TestAction::assert_eq("Error.name", "Error"),
-        TestAction::assert_eq("EvalError.name", "EvalError"),
-        TestAction::assert_eq("RangeError.name", "RangeError"),
-        TestAction::assert_eq("ReferenceError.name", "ReferenceError"),
-        TestAction::assert_eq("SyntaxError.name", "SyntaxError"),
-        TestAction::assert_eq("URIError.name", "URIError"),
-        TestAction::assert_eq("TypeError.name", "TypeError"),
-        TestAction::assert_eq("AggregateError.name", "AggregateError"),
+        TestAction::assert_eq("Error.name", js_string!("Error")),
+        TestAction::assert_eq("EvalError.name", js_string!("EvalError")),
+        TestAction::assert_eq("RangeError.name", js_string!("RangeError")),
+        TestAction::assert_eq("ReferenceError.name", js_string!("ReferenceError")),
+        TestAction::assert_eq("SyntaxError.name", js_string!("SyntaxError")),
+        TestAction::assert_eq("URIError.name", js_string!("URIError")),
+        TestAction::assert_eq("TypeError.name", js_string!("TypeError")),
+        TestAction::assert_eq("AggregateError.name", js_string!("AggregateError")),
     ]);
 }
 

boa_engine/src/builtins/error/type.rs

@@ -22,11 +22,12 @@ use crate::{
     },
     context::intrinsics::{Intrinsics, StandardConstructor, StandardConstructors},
     error::JsNativeError,
+    js_string,
     object::{internal_methods::get_prototype_from_constructor, JsObject, ObjectData, ObjectKind},
     property::Attribute,
     realm::Realm,
-    string::utf16,
-    Context, JsArgs, JsResult, JsValue, NativeFunction,
+    string::{common::StaticJsStrings, utf16},
+    Context, JsArgs, JsResult, JsString, JsValue, NativeFunction,
 };
 use boa_profiler::Profiler;
 
@@ -38,14 +39,14 @@ pub(crate) struct TypeError;
 
 impl IntrinsicObject for TypeError {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         let attribute = Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE;
         BuiltInBuilder::from_standard_constructor::<Self>(realm)
             .prototype(realm.intrinsics().constructors().error().constructor())
             .inherits(Some(realm.intrinsics().constructors().error().prototype()))
             .property(utf16!("name"), Self::NAME, attribute)
-            .property(utf16!("message"), "", attribute)
+            .property(utf16!("message"), js_string!(), attribute)
             .build();
     }
 
@@ -55,7 +56,7 @@ impl IntrinsicObject for TypeError {
 }
 
 impl BuiltInObject for TypeError {
-    const NAME: &'static str = "TypeError";
+    const NAME: JsString = StaticJsStrings::TYPE_ERROR;
 }
 
 impl BuiltInConstructor for TypeError {
@@ -129,7 +130,7 @@ impl IntrinsicObject for ThrowTypeError {
         let obj = BuiltInBuilder::with_intrinsic::<Self>(realm)
             .prototype(realm.intrinsics().constructors().function().prototype())
             .static_property(utf16!("length"), 0, Attribute::empty())
-            .static_property(utf16!("name"), "", Attribute::empty())
+            .static_property(utf16!("name"), js_string!(), Attribute::empty())
             .build();
 
         let mut obj = obj.borrow_mut();

boa_engine/src/builtins/error/uri.rs

@@ -13,11 +13,12 @@
 use crate::{
     builtins::{BuiltInBuilder, BuiltInConstructor, BuiltInObject, IntrinsicObject},
     context::intrinsics::{Intrinsics, StandardConstructor, StandardConstructors},
+    js_string,
     object::{internal_methods::get_prototype_from_constructor, JsObject, ObjectData},
     property::Attribute,
     realm::Realm,
-    string::utf16,
-    Context, JsArgs, JsResult, JsValue,
+    string::{common::StaticJsStrings, utf16},
+    Context, JsArgs, JsResult, JsString, JsValue,
 };
 use boa_profiler::Profiler;
 
@@ -29,14 +30,14 @@ pub(crate) struct UriError;
 
 impl IntrinsicObject for UriError {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         let attribute = Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE;
         BuiltInBuilder::from_standard_constructor::<Self>(realm)
             .prototype(realm.intrinsics().constructors().error().constructor())
             .inherits(Some(realm.intrinsics().constructors().error().prototype()))
             .property(utf16!("name"), Self::NAME, attribute)
-            .property(utf16!("message"), "", attribute)
+            .property(utf16!("message"), js_string!(), attribute)
             .build();
     }
 
@@ -46,7 +47,7 @@ impl IntrinsicObject for UriError {
 }
 
 impl BuiltInObject for UriError {
-    const NAME: &'static str = "URIError";
+    const NAME: JsString = StaticJsStrings::URI_ERROR;
 }
 
 impl BuiltInConstructor for UriError {

boa_engine/src/builtins/escape/mod.rs

@@ -11,8 +11,8 @@
 //! [spec]: https://tc39.es/ecma262/#sec-additional-properties-of-the-global-object
 
 use crate::{
-    context::intrinsics::Intrinsics, js_string, realm::Realm, Context, JsArgs, JsObject, JsResult,
-    JsValue,
+    context::intrinsics::Intrinsics, js_string, realm::Realm, string::common::StaticJsStrings,
+    Context, JsArgs, JsObject, JsResult, JsString, JsValue,
 };
 
 use super::{BuiltInBuilder, BuiltInObject, IntrinsicObject};
@@ -34,7 +34,7 @@ impl IntrinsicObject for Escape {
 }
 
 impl BuiltInObject for Escape {
-    const NAME: &'static str = "escape";
+    const NAME: JsString = StaticJsStrings::ESCAPE;
 }
 
 /// Builtin JavaScript `escape ( string )` function.
@@ -106,7 +106,7 @@ impl IntrinsicObject for Unescape {
 }
 
 impl BuiltInObject for Unescape {
-    const NAME: &'static str = "unescape";
+    const NAME: JsString = StaticJsStrings::UNESCAPE;
 }
 
 /// Builtin JavaScript `unescape ( string )` function.

boa_engine/src/builtins/eval/mod.rs

@@ -17,6 +17,7 @@ use crate::{
     error::JsNativeError,
     object::JsObject,
     realm::Realm,
+    string::common::StaticJsStrings,
     vm::{CallFrame, Opcode},
     Context, JsArgs, JsResult, JsString, JsValue,
 };
@@ -33,7 +34,7 @@ pub(crate) struct Eval;
 
 impl IntrinsicObject for Eval {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         BuiltInBuilder::callable_with_intrinsic::<Self>(realm, Self::eval)
             .name(Self::NAME)
@@ -47,7 +48,7 @@ impl IntrinsicObject for Eval {
 }
 
 impl BuiltInObject for Eval {
-    const NAME: &'static str = "eval";
+    const NAME: JsString = StaticJsStrings::EVAL;
 }
 
 impl Eval {

boa_engine/src/builtins/function/mod.rs

@@ -23,7 +23,7 @@ use crate::{
     object::{JsFunction, PrivateElement, PrivateName},
     property::{Attribute, PropertyDescriptor, PropertyKey},
     realm::Realm,
-    string::utf16,
+    string::{common::StaticJsStrings, utf16},
     symbol::JsSymbol,
     value::IntegerOrInfinity,
     vm::{ActiveRunnable, CodeBlock},
@@ -461,20 +461,20 @@ pub struct BuiltInFunctionObject;
 
 impl IntrinsicObject for BuiltInFunctionObject {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event("function", "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         let has_instance = BuiltInBuilder::callable(realm, Self::has_instance)
-            .name("[Symbol.hasInstance]")
+            .name(js_string!("[Symbol.hasInstance]"))
             .length(1)
             .build();
 
         let throw_type_error = realm.intrinsics().objects().throw_type_error();
 
         BuiltInBuilder::from_standard_constructor::<Self>(realm)
-            .method(Self::apply, "apply", 2)
-            .method(Self::bind, "bind", 1)
-            .method(Self::call, "call", 1)
-            .method(Self::to_string, "toString", 0)
+            .method(Self::apply, js_string!("apply"), 2)
+            .method(Self::bind, js_string!("bind"), 1)
+            .method(Self::call, js_string!("call"), 1)
+            .method(Self::to_string, js_string!("toString"), 0)
             .property(JsSymbol::has_instance(), has_instance, Attribute::default())
             .accessor(
                 utf16!("caller"),
@@ -493,7 +493,7 @@ impl IntrinsicObject for BuiltInFunctionObject {
         let prototype = realm.intrinsics().constructors().function().prototype();
 
         BuiltInBuilder::callable_with_object(realm, prototype.clone(), Self::prototype)
-            .name("")
+            .name(js_string!())
             .length(0)
             .build();
 
@@ -506,7 +506,7 @@ impl IntrinsicObject for BuiltInFunctionObject {
 }
 
 impl BuiltInObject for BuiltInFunctionObject {
-    const NAME: &'static str = "Function";
+    const NAME: JsString = StaticJsStrings::FUNCTION;
 }
 
 impl BuiltInConstructor for BuiltInFunctionObject {

boa_engine/src/builtins/function/tests.rs

@@ -50,7 +50,7 @@ fn self_mutating_function_when_constructing() {
 #[test]
 fn function_prototype() {
     run_test_actions([
-        TestAction::assert_eq("Function.prototype.name", ""),
+        TestAction::assert_eq("Function.prototype.name", js_string!()),
         TestAction::assert_eq("Function.prototype.length", 0),
         TestAction::assert_eq("Function.prototype()", JsValue::undefined()),
         TestAction::assert_eq(
@@ -69,7 +69,7 @@ fn function_prototype() {
 fn function_prototype_call() {
     run_test_actions([TestAction::assert_eq(
         "Object.prototype.toString.call(new Error())",
-        "[object Error]",
+        js_string!("[object Error]"),
     )]);
 }
 
@@ -134,9 +134,9 @@ fn closure_capture_clone() {
             let object = JsObject::with_object_proto(ctx.intrinsics());
             object
                 .define_property_or_throw(
-                    "key",
+                    js_string!("key"),
                     PropertyDescriptor::builder()
-                        .value(" world!")
+                        .value(js_string!(" world!"))
                         .writable(false)
                         .enumerable(false)
                         .configurable(false),
@@ -153,7 +153,7 @@ fn closure_capture_clone() {
                         let hw = js_string!(
                             string,
                             &object
-                                .__get_own_property__(&"key".into(), context)?
+                                .__get_own_property__(&js_string!("key").into(), context)?
                                 .and_then(|prop| prop.value().cloned())
                                 .and_then(|val| val.as_string().cloned())
                                 .ok_or_else(
@@ -168,10 +168,10 @@ fn closure_capture_clone() {
             .name("closure")
             .build();
 
-            ctx.register_global_property("closure", func, Attribute::default())
+            ctx.register_global_property(js_string!("closure"), func, Attribute::default())
                 .unwrap();
         }),
-        TestAction::assert_eq("closure()", "Hello world!"),
+        TestAction::assert_eq("closure()", js_string!("Hello world!")),
     ]);
 }
 

boa_engine/src/builtins/generator/mod.rs

@@ -14,13 +14,15 @@ use crate::{
     context::intrinsics::Intrinsics,
     environments::EnvironmentStack,
     error::JsNativeError,
+    js_string,
     object::{JsObject, CONSTRUCTOR},
     property::Attribute,
     realm::Realm,
+    string::common::StaticJsStrings,
     symbol::JsSymbol,
     value::JsValue,
     vm::{CallFrame, CompletionRecord, GeneratorResumeKind},
-    Context, JsArgs, JsError, JsResult,
+    Context, JsArgs, JsError, JsResult, JsString,
 };
 use boa_gc::{custom_trace, Finalize, Trace};
 use boa_profiler::Profiler;
@@ -136,7 +138,7 @@ pub struct Generator {
 
 impl IntrinsicObject for Generator {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         BuiltInBuilder::with_intrinsic::<Self>(realm)
             .prototype(
@@ -146,9 +148,9 @@ impl IntrinsicObject for Generator {
                     .iterator_prototypes()
                     .iterator(),
             )
-            .static_method(Self::next, "next", 1)
-            .static_method(Self::r#return, "return", 1)
-            .static_method(Self::throw, "throw", 1)
+            .static_method(Self::next, js_string!("next"), 1)
+            .static_method(Self::r#return, js_string!("return"), 1)
+            .static_method(Self::throw, js_string!("throw"), 1)
             .static_property(
                 JsSymbol::to_string_tag(),
                 Self::NAME,
@@ -172,7 +174,7 @@ impl IntrinsicObject for Generator {
 }
 
 impl Generator {
-    const NAME: &'static str = "Generator";
+    const NAME: JsString = StaticJsStrings::GENERATOR;
 
     /// `Generator.prototype.next ( value )`
     ///

boa_engine/src/builtins/generator_function/mod.rs

@@ -16,9 +16,10 @@ use crate::{
     object::PROTOTYPE,
     property::Attribute,
     realm::Realm,
+    string::common::StaticJsStrings,
     symbol::JsSymbol,
     value::JsValue,
-    Context, JsResult,
+    Context, JsResult, JsString,
 };
 use boa_profiler::Profiler;
 
@@ -30,7 +31,7 @@ pub struct GeneratorFunction;
 
 impl IntrinsicObject for GeneratorFunction {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         BuiltInBuilder::from_standard_constructor::<Self>(realm)
             .inherits(Some(
@@ -56,7 +57,7 @@ impl IntrinsicObject for GeneratorFunction {
 }
 
 impl BuiltInObject for GeneratorFunction {
-    const NAME: &'static str = "GeneratorFunction";
+    const NAME: JsString = StaticJsStrings::GENERATOR_FUNCTION;
 }
 
 impl BuiltInConstructor for GeneratorFunction {

boa_engine/src/builtins/intl/collator/mod.rs

@@ -19,6 +19,7 @@ use crate::{
         intrinsics::{Intrinsics, StandardConstructor, StandardConstructors},
         BoaProvider,
     },
+    js_string,
     native_function::NativeFunction,
     object::{
         internal_methods::get_prototype_from_constructor, FunctionObjectBuilder, JsFunction,
@@ -26,9 +27,9 @@ use crate::{
     },
     property::Attribute,
     realm::Realm,
-    string::utf16,
+    string::{common::StaticJsStrings, utf16},
     symbol::JsSymbol,
-    Context, JsArgs, JsNativeError, JsResult, JsValue,
+    Context, JsArgs, JsNativeError, JsResult, JsString, JsValue,
 };
 
 use super::{
@@ -149,26 +150,30 @@ impl Service for Collator {
 
 impl IntrinsicObject for Collator {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         let compare = BuiltInBuilder::callable(realm, Self::compare)
-            .name("get compare")
+            .name(js_string!("get compare"))
             .build();
 
         BuiltInBuilder::from_standard_constructor::<Self>(realm)
-            .static_method(Self::supported_locales_of, "supportedLocalesOf", 1)
+            .static_method(
+                Self::supported_locales_of,
+                js_string!("supportedLocalesOf"),
+                1,
+            )
             .property(
                 JsSymbol::to_string_tag(),
-                "Intl.Collator",
+                js_string!("Intl.Collator"),
                 Attribute::CONFIGURABLE,
             )
             .accessor(
-                utf16!("compare"),
+                js_string!("compare"),
                 Some(compare),
                 None,
                 Attribute::CONFIGURABLE,
             )
-            .method(Self::resolved_options, "resolvedOptions", 0)
+            .method(Self::resolved_options, js_string!("resolvedOptions"), 0)
             .build();
     }
 
@@ -178,7 +183,7 @@ impl IntrinsicObject for Collator {
 }
 
 impl BuiltInObject for Collator {
-    const NAME: &'static str = "Collator";
+    const NAME: JsString = StaticJsStrings::COLLATOR;
 }
 
 impl BuiltInConstructor for Collator {
@@ -510,14 +515,18 @@ impl Collator {
         //         i. Perform ! CreateDataPropertyOrThrow(options, p, v).
         // 5. Return options.
         options
-            .create_data_property_or_throw(utf16!("locale"), collator.locale.to_string(), context)
+            .create_data_property_or_throw(
+                utf16!("locale"),
+                js_string!(collator.locale.to_string()),
+                context,
+            )
             .expect("operation must not fail per the spec");
         options
             .create_data_property_or_throw(
                 utf16!("usage"),
                 match collator.usage {
-                    Usage::Search => "search",
-                    Usage::Sort => "sort",
+                    Usage::Search => js_string!("search"),
+                    Usage::Sort => js_string!("sort"),
                 },
                 context,
             )
@@ -526,25 +535,25 @@ impl Collator {
             .create_data_property_or_throw(
                 utf16!("sensitivity"),
                 match collator.sensitivity {
-                    Sensitivity::Base => "base",
-                    Sensitivity::Accent => "accent",
-                    Sensitivity::Case => "case",
-                    Sensitivity::Variant => "variant",
+                    Sensitivity::Base => js_string!("base"),
+                    Sensitivity::Accent => js_string!("accent"),
+                    Sensitivity::Case => js_string!("case"),
+                    Sensitivity::Variant => js_string!("variant"),
                 },
                 context,
             )
             .expect("operation must not fail per the spec");
         options
             .create_data_property_or_throw(
-                utf16!("ignorePunctuation"),
+                js_string!("ignorePunctuation"),
                 collator.ignore_punctuation,
                 context,
             )
             .expect("operation must not fail per the spec");
         options
             .create_data_property_or_throw(
-                utf16!("collation"),
-                collator.collation.to_string(),
+                js_string!("collation"),
+                js_string!(collator.collation.to_string()),
                 context,
             )
             .expect("operation must not fail per the spec");
@@ -554,11 +563,11 @@ impl Collator {
         if let Some(kf) = collator.case_first {
             options
                 .create_data_property_or_throw(
-                    utf16!("caseFirst"),
+                    js_string!("caseFirst"),
                     match kf {
-                        CaseFirst::Off => "false",
-                        CaseFirst::LowerFirst => "lower",
-                        CaseFirst::UpperFirst => "upper",
+                        CaseFirst::Off => js_string!("false"),
+                        CaseFirst::LowerFirst => js_string!("lower"),
+                        CaseFirst::UpperFirst => js_string!("upper"),
                         _ => unreachable!(),
                     },
                     context,

boa_engine/src/builtins/intl/date_time_format.rs

@@ -16,7 +16,7 @@ use crate::{
     js_string,
     object::{internal_methods::get_prototype_from_constructor, JsObject, ObjectData},
     realm::Realm,
-    string::utf16,
+    string::{common::StaticJsStrings, utf16},
     Context, JsResult, JsString, JsValue,
 };
 
@@ -64,7 +64,7 @@ pub struct DateTimeFormat {
 
 impl IntrinsicObject for DateTimeFormat {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         BuiltInBuilder::from_standard_constructor::<Self>(realm).build();
     }
@@ -75,7 +75,7 @@ impl IntrinsicObject for DateTimeFormat {
 }
 
 impl BuiltInObject for DateTimeFormat {
-    const NAME: &'static str = "DateTimeFormat";
+    const NAME: JsString = StaticJsStrings::DATE_TIME_FORMAT;
 }
 
 impl BuiltInConstructor for DateTimeFormat {
@@ -272,7 +272,7 @@ pub(crate) fn to_date_time_options(
         // a. For each property name prop of « "year", "month", "day" », do
         for property in [utf16!("year"), utf16!("month"), utf16!("day")] {
             // i. Perform ? CreateDataPropertyOrThrow(options, prop, "numeric").
-            options.create_data_property_or_throw(property, "numeric", context)?;
+            options.create_data_property_or_throw(property, js_string!("numeric"), context)?;
         }
     }
 
@@ -281,7 +281,7 @@ pub(crate) fn to_date_time_options(
         // a. For each property name prop of « "hour", "minute", "second" », do
         for property in [utf16!("hour"), utf16!("minute"), utf16!("second")] {
             // i. Perform ? CreateDataPropertyOrThrow(options, prop, "numeric").
-            options.create_data_property_or_throw(property, "numeric", context)?;
+            options.create_data_property_or_throw(property, js_string!("numeric"), context)?;
         }
     }
 

boa_engine/src/builtins/intl/list_format/mod.rs

@@ -11,10 +11,11 @@ use crate::{
         Array, BuiltInBuilder, BuiltInConstructor, BuiltInObject, IntrinsicObject,
     },
     context::intrinsics::{Intrinsics, StandardConstructor, StandardConstructors},
+    js_string,
     object::{internal_methods::get_prototype_from_constructor, JsObject, ObjectData},
     property::Attribute,
     realm::Realm,
-    string::utf16,
+    string::{common::StaticJsStrings, utf16},
     symbol::JsSymbol,
     Context, JsArgs, JsNativeError, JsResult, JsString, JsValue,
 };
@@ -44,18 +45,22 @@ impl Service for ListFormat {
 
 impl IntrinsicObject for ListFormat {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         BuiltInBuilder::from_standard_constructor::<Self>(realm)
-            .static_method(Self::supported_locales_of, "supportedLocalesOf", 1)
+            .static_method(
+                Self::supported_locales_of,
+                js_string!("supportedLocalesOf"),
+                1,
+            )
             .property(
                 JsSymbol::to_string_tag(),
-                "Intl.ListFormat",
+                js_string!("Intl.ListFormat"),
                 Attribute::CONFIGURABLE,
             )
-            .method(Self::format, "format", 1)
-            .method(Self::format_to_parts, "formatToParts", 1)
-            .method(Self::resolved_options, "resolvedOptions", 0)
+            .method(Self::format, js_string!("format"), 1)
+            .method(Self::format_to_parts, js_string!("formatToParts"), 1)
+            .method(Self::resolved_options, js_string!("resolvedOptions"), 0)
             .build();
     }
 
@@ -65,7 +70,7 @@ impl IntrinsicObject for ListFormat {
 }
 
 impl BuiltInObject for ListFormat {
-    const NAME: &'static str = "ListFormat";
+    const NAME: JsString = StaticJsStrings::LIST_FORMAT;
 }
 
 impl BuiltInConstructor for ListFormat {
@@ -229,11 +234,12 @@ impl ListFormat {
         // TODO: support for UTF-16 unpaired surrogates formatting
         let strings = string_list_from_iterable(args.get_or_undefined(0), context)?;
 
-        // 4. Return ! FormatList(lf, stringList).
-        Ok(lf
+        let formatted = lf
             .native
-            .format_to_string(strings.into_iter().map(|s| s.to_std_string_escaped()))
-            .into())
+            .format_to_string(strings.into_iter().map(|s| s.to_std_string_escaped()));
+
+        // 4. Return ! FormatList(lf, stringList).
+        Ok(js_string!(formatted).into())
     }
 
     /// [`Intl.ListFormat.prototype.formatToParts ( list )`][spec].
@@ -375,11 +381,11 @@ impl ListFormat {
                 .create(ObjectData::ordinary(), vec![]);
 
             // b. Perform ! CreateDataPropertyOrThrow(O, "type", part.[[Type]]).
-            o.create_data_property_or_throw(utf16!("type"), part.typ(), context)
+            o.create_data_property_or_throw(utf16!("type"), js_string!(part.typ()), context)
                 .expect("operation must not fail per the spec");
 
             // c. Perform ! CreateDataPropertyOrThrow(O, "value", part.[[Value]]).
-            o.create_data_property_or_throw(utf16!("value"), part.value(), context)
+            o.create_data_property_or_throw(utf16!("value"), js_string!(part.value()), context)
                 .expect("operation must not fail per the spec");
 
             // d. Perform ! CreateDataPropertyOrThrow(result, ! ToString(n), O).
@@ -433,26 +439,30 @@ impl ListFormat {
         //     c. Assert: v is not undefined.
         //     d. Perform ! CreateDataPropertyOrThrow(options, p, v).
         options
-            .create_data_property_or_throw(utf16!("locale"), lf.locale.to_string(), context)
+            .create_data_property_or_throw(
+                utf16!("locale"),
+                js_string!(lf.locale.to_string()),
+                context,
+            )
             .expect("operation must not fail per the spec");
         options
             .create_data_property_or_throw(
-                utf16!("type"),
+                js_string!("type"),
                 match lf.typ {
-                    ListFormatType::Conjunction => "conjunction",
-                    ListFormatType::Disjunction => "disjunction",
-                    ListFormatType::Unit => "unit",
+                    ListFormatType::Conjunction => js_string!("conjunction"),
+                    ListFormatType::Disjunction => js_string!("disjunction"),
+                    ListFormatType::Unit => js_string!("unit"),
                 },
                 context,
             )
             .expect("operation must not fail per the spec");
         options
             .create_data_property_or_throw(
-                utf16!("style"),
+                js_string!("style"),
                 match lf.style {
-                    ListLength::Wide => "long",
-                    ListLength::Short => "short",
-                    ListLength::Narrow => "narrow",
+                    ListLength::Wide => js_string!("long"),
+                    ListLength::Short => js_string!("short"),
+                    ListLength::Narrow => js_string!("narrow"),
                     _ => unreachable!(),
                 },
                 context,

boa_engine/src/builtins/intl/locale/mod.rs

@@ -1,4 +1,8 @@
-use crate::{builtins::options::get_option, realm::Realm, string::utf16};
+use crate::{
+    builtins::options::get_option,
+    realm::Realm,
+    string::{common::StaticJsStrings, utf16},
+};
 use boa_profiler::Profiler;
 use icu_collator::CaseFirst;
 use icu_datetime::options::preferences::HourCycle;
@@ -33,113 +37,113 @@ pub(crate) struct Locale;
 
 impl IntrinsicObject for Locale {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         let base_name = BuiltInBuilder::callable(realm, Self::base_name)
-            .name("get baseName")
+            .name(js_string!("get baseName"))
             .build();
 
         let calendar = BuiltInBuilder::callable(realm, Self::calendar)
-            .name("get calendar")
+            .name(js_string!("get calendar"))
             .build();
 
         let case_first = BuiltInBuilder::callable(realm, Self::case_first)
-            .name("get caseFirst")
+            .name(js_string!("get caseFirst"))
             .build();
 
         let collation = BuiltInBuilder::callable(realm, Self::collation)
-            .name("get collation")
+            .name(js_string!("get collation"))
             .build();
 
         let hour_cycle = BuiltInBuilder::callable(realm, Self::hour_cycle)
-            .name("get hourCycle")
+            .name(js_string!("get hourCycle"))
             .build();
 
         let numeric = BuiltInBuilder::callable(realm, Self::numeric)
-            .name("get numeric")
+            .name(js_string!("get numeric"))
             .build();
 
         let numbering_system = BuiltInBuilder::callable(realm, Self::numbering_system)
-            .name("get numberingSystem")
+            .name(js_string!("get numberingSystem"))
             .build();
 
         let language = BuiltInBuilder::callable(realm, Self::language)
-            .name("get language")
+            .name(js_string!("get language"))
             .build();
 
         let script = BuiltInBuilder::callable(realm, Self::script)
-            .name("get script")
+            .name(js_string!("get script"))
             .build();
 
         let region = BuiltInBuilder::callable(realm, Self::region)
-            .name("get region")
+            .name(js_string!("get region"))
             .build();
 
         BuiltInBuilder::from_standard_constructor::<Self>(realm)
             .property(
                 JsSymbol::to_string_tag(),
-                "Intl.Locale",
+                js_string!("Intl.Locale"),
                 Attribute::CONFIGURABLE,
             )
-            .method(Self::maximize, "maximize", 0)
-            .method(Self::minimize, "minimize", 0)
-            .method(Self::to_string, "toString", 0)
+            .method(Self::maximize, js_string!("maximize"), 0)
+            .method(Self::minimize, js_string!("minimize"), 0)
+            .method(Self::to_string, js_string!("toString"), 0)
             .accessor(
-                utf16!("baseName"),
+                js_string!("baseName"),
                 Some(base_name),
                 None,
                 Attribute::CONFIGURABLE,
             )
             .accessor(
-                utf16!("calendar"),
+                js_string!("calendar"),
                 Some(calendar),
                 None,
                 Attribute::CONFIGURABLE,
             )
             .accessor(
-                utf16!("caseFirst"),
+                js_string!("caseFirst"),
                 Some(case_first),
                 None,
                 Attribute::CONFIGURABLE,
             )
             .accessor(
-                utf16!("collation"),
+                js_string!("collation"),
                 Some(collation),
                 None,
                 Attribute::CONFIGURABLE,
             )
             .accessor(
-                utf16!("hourCycle"),
+                js_string!("hourCycle"),
                 Some(hour_cycle),
                 None,
                 Attribute::CONFIGURABLE,
             )
             .accessor(
-                utf16!("numeric"),
+                js_string!("numeric"),
                 Some(numeric),
                 None,
                 Attribute::CONFIGURABLE,
             )
             .accessor(
-                utf16!("numberingSystem"),
+                js_string!("numberingSystem"),
                 Some(numbering_system),
                 None,
                 Attribute::CONFIGURABLE,
             )
             .accessor(
-                utf16!("language"),
+                js_string!("language"),
                 Some(language),
                 None,
                 Attribute::CONFIGURABLE,
             )
             .accessor(
-                utf16!("script"),
+                js_string!("script"),
                 Some(script),
                 None,
                 Attribute::CONFIGURABLE,
             )
             .accessor(
-                utf16!("region"),
+                js_string!("region"),
                 Some(region),
                 None,
                 Attribute::CONFIGURABLE,
@@ -153,7 +157,7 @@ impl IntrinsicObject for Locale {
 }
 
 impl BuiltInObject for Locale {
-    const NAME: &'static str = "Locale";
+    const NAME: JsString = StaticJsStrings::LOCALE;
 }
 
 impl BuiltInConstructor for Locale {

boa_engine/src/builtins/intl/locale/utils.rs

@@ -8,6 +8,7 @@ use crate::{
         Array,
     },
     context::{icu::Icu, BoaProvider},
+    js_string,
     object::JsObject,
     string::utf16,
     Context, JsNativeError, JsResult, JsValue,
@@ -563,7 +564,9 @@ where
 
     // 5. Return CreateArrayFromList(supportedLocales).
     Ok(Array::create_array_from_list(
-        elements.into_iter().map(|loc| loc.to_string().into()),
+        elements
+            .into_iter()
+            .map(|loc| js_string!(loc.to_string()).into()),
         context,
     ))
 }

boa_engine/src/builtins/intl/mod.rs

@@ -16,11 +16,13 @@
 use crate::{
     builtins::{Array, BuiltInBuilder, BuiltInObject, IntrinsicObject},
     context::{intrinsics::Intrinsics, BoaProvider},
+    js_string,
     object::JsObject,
     property::Attribute,
     realm::Realm,
+    string::common::StaticJsStrings,
     symbol::JsSymbol,
-    Context, JsArgs, JsResult, JsValue,
+    Context, JsArgs, JsResult, JsString, JsValue,
 };
 
 use boa_profiler::Profiler;
@@ -47,7 +49,7 @@ pub(crate) struct Intl;
 
 impl IntrinsicObject for Intl {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         BuiltInBuilder::with_intrinsic::<Self>(realm)
             .static_property(
@@ -97,7 +99,11 @@ impl IntrinsicObject for Intl {
                     .constructor(),
                 DateTimeFormat::ATTRIBUTE,
             )
-            .static_method(Self::get_canonical_locales, "getCanonicalLocales", 1)
+            .static_method(
+                Self::get_canonical_locales,
+                js_string!("getCanonicalLocales"),
+                1,
+            )
             .build();
     }
 
@@ -107,7 +113,7 @@ impl IntrinsicObject for Intl {
 }
 
 impl BuiltInObject for Intl {
-    const NAME: &'static str = "Intl";
+    const NAME: JsString = StaticJsStrings::INTL;
 }
 
 impl Intl {
@@ -133,7 +139,7 @@ impl Intl {
 
         // 2. Return CreateArrayFromList(ll).
         Ok(JsValue::Object(Array::create_array_from_list(
-            ll.into_iter().map(|loc| loc.to_string().into()),
+            ll.into_iter().map(|loc| js_string!(loc.to_string()).into()),
             context,
         )))
     }

boa_engine/src/builtins/intl/plural_rules/mod.rs

@@ -19,6 +19,7 @@ use crate::{
     object::{internal_methods::get_prototype_from_constructor, ObjectData, ObjectInitializer},
     property::Attribute,
     realm::Realm,
+    string::common::StaticJsStrings,
     Context, JsArgs, JsNativeError, JsObject, JsResult, JsString, JsSymbol, JsValue,
 };
 
@@ -48,17 +49,21 @@ impl Service for PluralRules {
 
 impl IntrinsicObject for PluralRules {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         BuiltInBuilder::from_standard_constructor::<Self>(realm)
-            .static_method(Self::supported_locales_of, "supportedLocalesOf", 1)
+            .static_method(
+                Self::supported_locales_of,
+                js_string!("supportedLocalesOf"),
+                1,
+            )
             .property(
                 JsSymbol::to_string_tag(),
-                "Intl.PluralRules",
+                js_string!("Intl.PluralRules"),
                 Attribute::CONFIGURABLE,
             )
-            .method(Self::resolved_options, "resolvedOptions", 0)
-            .method(Self::select, "select", 1)
+            .method(Self::resolved_options, js_string!("resolvedOptions"), 0)
+            .method(Self::select, js_string!("select"), 1)
             .build();
     }
 
@@ -68,7 +73,7 @@ impl IntrinsicObject for PluralRules {
 }
 
 impl BuiltInObject for PluralRules {
-    const NAME: &'static str = "PluralRules";
+    const NAME: JsString = StaticJsStrings::PLURAL_RULES;
 }
 
 impl BuiltInConstructor for PluralRules {
@@ -263,15 +268,15 @@ impl PluralRules {
         options
             .property(
                 js_string!("locale"),
-                plural_rules.locale.to_string(),
+                js_string!(plural_rules.locale.to_string()),
                 Attribute::all(),
             )
             .property(
                 js_string!("type"),
                 match plural_rules.rule_type {
-                    PluralRuleType::Cardinal => "cardinal",
-                    PluralRuleType::Ordinal => "ordinal",
-                    _ => "unknown",
+                    PluralRuleType::Cardinal => js_string!("cardinal"),
+                    PluralRuleType::Ordinal => js_string!("ordinal"),
+                    _ => js_string!("unknown"),
                 },
                 Attribute::all(),
             )
@@ -318,7 +323,7 @@ impl PluralRules {
         options
             .property(
                 js_string!("roundingMode"),
-                plural_rules.format_options.rounding_mode.to_string(),
+                js_string!(plural_rules.format_options.rounding_mode.to_string()),
                 Attribute::all(),
             )
             .property(
@@ -328,10 +333,10 @@ impl PluralRules {
             )
             .property(
                 js_string!("trailingZeroDisplay"),
-                plural_rules
+                js_string!(plural_rules
                     .format_options
                     .trailing_zero_display
-                    .to_string(),
+                    .to_string()),
                 Attribute::all(),
             );
 
@@ -360,7 +365,7 @@ impl PluralRules {
         //     a. Perform ! CreateDataPropertyOrThrow(options, "roundingPriority", "auto").
         options.property(
             js_string!("roundingPriority"),
-            plural_rules.format_options.rounding_priority.to_string(),
+            js_string!(plural_rules.format_options.rounding_priority.to_string()),
             Attribute::all(),
         );
 

boa_engine/src/builtins/intl/segmenter/mod.rs

@@ -19,6 +19,7 @@ use crate::{
     },
     property::Attribute,
     realm::Realm,
+    string::common::StaticJsStrings,
     Context, JsArgs, JsNativeError, JsResult, JsString, JsSymbol, JsValue,
 };
 
@@ -77,17 +78,21 @@ impl Service for Segmenter {
 
 impl IntrinsicObject for Segmenter {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         BuiltInBuilder::from_standard_constructor::<Self>(realm)
-            .static_method(Self::supported_locales_of, "supportedLocalesOf", 1)
+            .static_method(
+                Self::supported_locales_of,
+                js_string!("supportedLocalesOf"),
+                1,
+            )
             .property(
                 JsSymbol::to_string_tag(),
-                "Intl.Segmenter",
+                js_string!("Intl.Segmenter"),
                 Attribute::CONFIGURABLE,
             )
-            .method(Self::resolved_options, "resolvedOptions", 0)
-            .method(Self::segment, "segment", 1)
+            .method(Self::resolved_options, js_string!("resolvedOptions"), 0)
+            .method(Self::segment, js_string!("segment"), 1)
             .build();
     }
 
@@ -97,7 +102,7 @@ impl IntrinsicObject for Segmenter {
 }
 
 impl BuiltInObject for Segmenter {
-    const NAME: &'static str = "Segmenter";
+    const NAME: JsString = StaticJsStrings::SEGMENTER;
 }
 
 impl BuiltInConstructor for Segmenter {
@@ -247,12 +252,12 @@ impl Segmenter {
         let options = ObjectInitializer::new(context)
             .property(
                 js_string!("locale"),
-                segmenter.locale.to_string(),
+                js_string!(segmenter.locale.to_string()),
                 Attribute::all(),
             )
             .property(
                 js_string!("granularity"),
-                segmenter.native.granularity().to_string(),
+                js_string!(segmenter.native.granularity().to_string()),
                 Attribute::all(),
             )
             .build();

boa_engine/src/builtins/intl/segmenter/segments.rs

@@ -24,7 +24,7 @@ impl IntrinsicObject for Segments {
         let _timer = Profiler::global().start_event("%SegmentsPrototype%", "init");
 
         BuiltInBuilder::with_intrinsic::<Self>(realm)
-            .static_method(Self::containing, "containing", 1)
+            .static_method(Self::containing, js_string!("containing"), 1)
             .static_method(
                 Self::iterator,
                 (JsSymbol::iterator(), js_string!("[Symbol.iterator]")),

boa_engine/src/builtins/iterable/async_from_sync_iterator.rs

@@ -5,6 +5,7 @@ use crate::{
         BuiltInBuilder, IntrinsicObject, Promise,
     },
     context::intrinsics::Intrinsics,
+    js_string,
     native_function::NativeFunction,
     object::{FunctionObjectBuilder, JsObject, ObjectData},
     realm::Realm,
@@ -28,7 +29,7 @@ pub struct AsyncFromSyncIterator {
 
 impl IntrinsicObject for AsyncFromSyncIterator {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event("AsyncFromSyncIteratorPrototype", "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         BuiltInBuilder::with_intrinsic::<Self>(realm)
             .prototype(
@@ -38,9 +39,9 @@ impl IntrinsicObject for AsyncFromSyncIterator {
                     .iterator_prototypes()
                     .async_iterator(),
             )
-            .static_method(Self::next, "next", 1)
-            .static_method(Self::r#return, "return", 1)
-            .static_method(Self::throw, "throw", 1)
+            .static_method(Self::next, js_string!("next"), 1)
+            .static_method(Self::r#return, js_string!("return"), 1)
+            .static_method(Self::throw, js_string!("throw"), 1)
             .build();
     }
 

boa_engine/src/builtins/json/mod.rs

@@ -26,7 +26,7 @@ use crate::{
     object::JsObject,
     property::{Attribute, PropertyNameKind},
     realm::Realm,
-    string::{utf16, CodePoint},
+    string::{common::StaticJsStrings, utf16, CodePoint},
     symbol::JsSymbol,
     value::IntegerOrInfinity,
     vm::CallFrame,
@@ -48,14 +48,14 @@ pub(crate) struct Json;
 
 impl IntrinsicObject for Json {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         let to_string_tag = JsSymbol::to_string_tag();
         let attribute = Attribute::READONLY | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE;
 
         BuiltInBuilder::with_intrinsic::<Self>(realm)
-            .static_method(Self::parse, "parse", 2)
-            .static_method(Self::stringify, "stringify", 3)
+            .static_method(Self::parse, js_string!("parse"), 2)
+            .static_method(Self::stringify, js_string!("stringify"), 3)
             .static_property(to_string_tag, Self::NAME, attribute)
             .build();
     }
@@ -66,7 +66,7 @@ impl IntrinsicObject for Json {
 }
 
 impl BuiltInObject for Json {
-    const NAME: &'static str = "JSON";
+    const NAME: JsString = StaticJsStrings::JSON;
 }
 
 impl Json {

boa_engine/src/builtins/json/tests.rs

@@ -1,12 +1,15 @@
 use indoc::indoc;
 
-use crate::{run_test_actions, JsNativeErrorKind, JsValue, TestAction};
+use crate::{js_string, run_test_actions, JsNativeErrorKind, JsValue, TestAction};
 
 #[test]
 fn json_sanity() {
     run_test_actions([
-        TestAction::assert_eq(r#"JSON.parse('{"aaa":"bbb"}').aaa"#, "bbb"),
-        TestAction::assert_eq(r#"JSON.stringify({aaa: 'bbb'})"#, r#"{"aaa":"bbb"}"#),
+        TestAction::assert_eq(r#"JSON.parse('{"aaa":"bbb"}').aaa"#, js_string!("bbb")),
+        TestAction::assert_eq(
+            r#"JSON.stringify({aaa: 'bbb'})"#,
+            js_string!(r#"{"aaa":"bbb"}"#),
+        ),
     ]);
 }
 
@@ -14,7 +17,7 @@ fn json_sanity() {
 fn json_stringify_remove_undefined_values_from_objects() {
     run_test_actions([TestAction::assert_eq(
         r#"JSON.stringify({ aaa: undefined, bbb: 'ccc' })"#,
-        r#"{"bbb":"ccc"}"#,
+        js_string!(r#"{"bbb":"ccc"}"#),
     )]);
 }
 
@@ -22,7 +25,7 @@ fn json_stringify_remove_undefined_values_from_objects() {
 fn json_stringify_remove_function_values_from_objects() {
     run_test_actions([TestAction::assert_eq(
         r#"JSON.stringify({ aaa: () => {}, bbb: 'ccc' })"#,
-        r#"{"bbb":"ccc"}"#,
+        js_string!(r#"{"bbb":"ccc"}"#),
     )]);
 }
 
@@ -30,7 +33,7 @@ fn json_stringify_remove_function_values_from_objects() {
 fn json_stringify_remove_symbols_from_objects() {
     run_test_actions([TestAction::assert_eq(
         r#"JSON.stringify({ aaa: Symbol(), bbb: 'ccc' })"#,
-        r#"{"bbb":"ccc"}"#,
+        js_string!(r#"{"bbb":"ccc"}"#),
     )]);
 }
 
@@ -38,7 +41,7 @@ fn json_stringify_remove_symbols_from_objects() {
 fn json_stringify_replacer_array_strings() {
     run_test_actions([TestAction::assert_eq(
         r#"JSON.stringify({aaa: 'bbb', bbb: 'ccc', ccc: 'ddd'}, ['aaa', 'bbb'])"#,
-        r#"{"aaa":"bbb","bbb":"ccc"}"#,
+        js_string!(r#"{"aaa":"bbb","bbb":"ccc"}"#),
     )]);
 }
 
@@ -46,7 +49,7 @@ fn json_stringify_replacer_array_strings() {
 fn json_stringify_replacer_array_numbers() {
     run_test_actions([TestAction::assert_eq(
         r#"JSON.stringify({ 0: 'aaa', 1: 'bbb', 2: 'ccc'}, [1, 2])"#,
-        r#"{"1":"bbb","2":"ccc"}"#,
+        js_string!(r#"{"1":"bbb","2":"ccc"}"#),
     )]);
 }
 
@@ -62,7 +65,7 @@ fn json_stringify_replacer_function() {
                 return value;
             })
         "#},
-        r#"{"bbb":2}"#,
+        js_string!(r#"{"bbb":2}"#),
     )]);
 }
 
@@ -70,7 +73,7 @@ fn json_stringify_replacer_function() {
 fn json_stringify_arrays() {
     run_test_actions([TestAction::assert_eq(
         "JSON.stringify(['a', 'b'])",
-        r#"["a","b"]"#,
+        js_string!(r#"["a","b"]"#),
     )]);
 }
 
@@ -78,7 +81,7 @@ fn json_stringify_arrays() {
 fn json_stringify_object_array() {
     run_test_actions([TestAction::assert_eq(
         "JSON.stringify([{a: 'b'}, {b: 'c'}])",
-        r#"[{"a":"b"},{"b":"c"}]"#,
+        js_string!(r#"[{"a":"b"},{"b":"c"}]"#),
     )]);
 }
 
@@ -86,7 +89,7 @@ fn json_stringify_object_array() {
 fn json_stringify_array_converts_undefined_to_null() {
     run_test_actions([TestAction::assert_eq(
         "JSON.stringify([undefined])",
-        "[null]",
+        js_string!("[null]"),
     )]);
 }
 
@@ -94,7 +97,7 @@ fn json_stringify_array_converts_undefined_to_null() {
 fn json_stringify_array_converts_function_to_null() {
     run_test_actions([TestAction::assert_eq(
         "JSON.stringify([() => {}])",
-        "[null]",
+        js_string!("[null]"),
     )]);
 }
 
@@ -102,7 +105,7 @@ fn json_stringify_array_converts_function_to_null() {
 fn json_stringify_array_converts_symbol_to_null() {
     run_test_actions([TestAction::assert_eq(
         "JSON.stringify([Symbol()])",
-        "[null]",
+        js_string!("[null]"),
     )]);
 }
 #[test]
@@ -147,19 +150,22 @@ fn json_stringify_no_args() {
 
 #[test]
 fn json_stringify_fractional_numbers() {
-    run_test_actions([TestAction::assert_eq("JSON.stringify(1.2)", "1.2")]);
+    run_test_actions([TestAction::assert_eq(
+        "JSON.stringify(1.2)",
+        js_string!("1.2"),
+    )]);
 }
 
 #[test]
 fn json_stringify_pretty_print() {
     run_test_actions([TestAction::assert_eq(
         r#"JSON.stringify({a: "b", b: "c"}, undefined, 4)"#,
-        indoc! {r#"
+        js_string!(indoc! {r#"
             {
                 "a": "b",
                 "b": "c"
             }"#
-        },
+        }),
     )]);
 }
 
@@ -167,12 +173,12 @@ fn json_stringify_pretty_print() {
 fn json_stringify_pretty_print_four_spaces() {
     run_test_actions([TestAction::assert_eq(
         r#"JSON.stringify({a: "b", b: "c"}, undefined, 4.3)"#,
-        indoc! {r#"
+        js_string!(indoc! {r#"
             {
                 "a": "b",
                 "b": "c"
             }"#
-        },
+        }),
     )]);
 }
 
@@ -180,12 +186,12 @@ fn json_stringify_pretty_print_four_spaces() {
 fn json_stringify_pretty_print_twenty_spaces() {
     run_test_actions([TestAction::assert_eq(
         r#"JSON.stringify({a: "b", b: "c"}, undefined, 20)"#,
-        indoc! {r#"
+        js_string!(indoc! {r#"
             {
                       "a": "b",
                       "b": "c"
             }"#
-        },
+        }),
     )]);
 }
 
@@ -193,12 +199,12 @@ fn json_stringify_pretty_print_twenty_spaces() {
 fn json_stringify_pretty_print_with_number_object() {
     run_test_actions([TestAction::assert_eq(
         r#"JSON.stringify({a: "b", b: "c"}, undefined, new Number(10))"#,
-        indoc! {r#"
+        js_string!(indoc! {r#"
             {
                       "a": "b",
                       "b": "c"
             }"#
-        },
+        }),
     )]);
 }
 
@@ -206,7 +212,7 @@ fn json_stringify_pretty_print_with_number_object() {
 fn json_stringify_pretty_print_bad_space_argument() {
     run_test_actions([TestAction::assert_eq(
         r#"JSON.stringify({a: "b", b: "c"}, undefined, [])"#,
-        r#"{"a":"b","b":"c"}"#,
+        js_string!(r#"{"a":"b","b":"c"}"#),
     )]);
 }
 
@@ -214,12 +220,12 @@ fn json_stringify_pretty_print_bad_space_argument() {
 fn json_stringify_pretty_print_with_too_long_string() {
     run_test_actions([TestAction::assert_eq(
         r#"JSON.stringify({a: "b", b: "c"}, undefined, "abcdefghijklmn")"#,
-        indoc! {r#"
+        js_string!(indoc! {r#"
             {
             abcdefghij"a": "b",
             abcdefghij"b": "c"
             }"#
-        },
+        }),
     )]);
 }
 
@@ -227,12 +233,12 @@ fn json_stringify_pretty_print_with_too_long_string() {
 fn json_stringify_pretty_print_with_string_object() {
     run_test_actions([TestAction::assert_eq(
         r#"JSON.stringify({a: "b", b: "c"}, undefined, new String("abcd"))"#,
-        indoc! {r#"
+        js_string!(indoc! {r#"
             {
             abcd"a": "b",
             abcd"b": "c"
             }"#
-        },
+        }),
     )]);
 }
 
@@ -272,8 +278,8 @@ fn json_parse_object_with_reviver() {
 
                 var jsonObj = JSON.parse(jsonString, dataReviver);
             "#}),
-        TestAction::assert_eq("jsonObj.firstname", "boa"),
-        TestAction::assert_eq("jsonObj.lastname", "interpreter"),
+        TestAction::assert_eq("jsonObj.firstname", js_string!("boa")),
+        TestAction::assert_eq("jsonObj.lastname", js_string!("interpreter")),
     ]);
 }
 

boa_engine/src/builtins/map/map_iterator.rs

@@ -12,6 +12,7 @@ use crate::{
     },
     context::intrinsics::Intrinsics,
     error::JsNativeError,
+    js_string,
     object::{JsObject, ObjectData},
     property::{Attribute, PropertyNameKind},
     realm::Realm,
@@ -38,7 +39,7 @@ pub struct MapIterator {
 
 impl IntrinsicObject for MapIterator {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event("MapIterator", "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         BuiltInBuilder::with_intrinsic::<Self>(realm)
             .prototype(
@@ -48,10 +49,10 @@ impl IntrinsicObject for MapIterator {
                     .iterator_prototypes()
                     .iterator(),
             )
-            .static_method(Self::next, "next", 0)
+            .static_method(Self::next, js_string!("next"), 0)
             .static_property(
                 JsSymbol::to_string_tag(),
-                "Map Iterator",
+                js_string!("Map Iterator"),
                 Attribute::CONFIGURABLE,
             )
             .build();

boa_engine/src/builtins/map/mod.rs

@@ -14,12 +14,13 @@ use crate::{
     builtins::BuiltInObject,
     context::intrinsics::{Intrinsics, StandardConstructor, StandardConstructors},
     error::JsNativeError,
+    js_string,
     object::{internal_methods::get_prototype_from_constructor, JsObject, ObjectData},
     property::{Attribute, PropertyNameKind},
     realm::Realm,
-    string::utf16,
+    string::{common::StaticJsStrings, utf16},
     symbol::JsSymbol,
-    Context, JsArgs, JsResult, JsValue,
+    Context, JsArgs, JsResult, JsString, JsValue,
 };
 use boa_profiler::Profiler;
 use num_traits::Zero;
@@ -39,18 +40,18 @@ pub(crate) struct Map;
 
 impl IntrinsicObject for Map {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         let get_species = BuiltInBuilder::callable(realm, Self::get_species)
-            .name("get [Symbol.species]")
+            .name(js_string!("get [Symbol.species]"))
             .build();
 
         let get_size = BuiltInBuilder::callable(realm, Self::get_size)
-            .name("get size")
+            .name(js_string!("get size"))
             .build();
 
         let entries_function = BuiltInBuilder::callable(realm, Self::entries)
-            .name("entries")
+            .name(js_string!("entries"))
             .build();
 
         BuiltInBuilder::from_standard_constructor::<Self>(realm)
@@ -75,16 +76,16 @@ impl IntrinsicObject for Map {
                 Self::NAME,
                 Attribute::READONLY | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE,
             )
-            .method(Self::clear, "clear", 0)
-            .method(Self::delete, "delete", 1)
-            .method(Self::for_each, "forEach", 1)
-            .method(Self::get, "get", 1)
-            .method(Self::has, "has", 1)
-            .method(Self::keys, "keys", 0)
-            .method(Self::set, "set", 2)
-            .method(Self::values, "values", 0)
+            .method(Self::clear, js_string!("clear"), 0)
+            .method(Self::delete, js_string!("delete"), 1)
+            .method(Self::for_each, js_string!("forEach"), 1)
+            .method(Self::get, js_string!("get"), 1)
+            .method(Self::has, js_string!("has"), 1)
+            .method(Self::keys, js_string!("keys"), 0)
+            .method(Self::set, js_string!("set"), 2)
+            .method(Self::values, js_string!("values"), 0)
             .accessor(
-                utf16!("size"),
+                js_string!("size"),
                 Some(get_size),
                 None,
                 Attribute::CONFIGURABLE,
@@ -98,7 +99,7 @@ impl IntrinsicObject for Map {
 }
 
 impl BuiltInObject for Map {
-    const NAME: &'static str = "Map";
+    const NAME: JsString = StaticJsStrings::MAP;
 }
 
 impl BuiltInConstructor for Map {

boa_engine/src/builtins/map/tests.rs

@@ -1,4 +1,4 @@
-use crate::{run_test_actions, JsNativeErrorKind, JsValue, TestAction};
+use crate::{js_string, run_test_actions, JsNativeErrorKind, JsValue, TestAction};
 use indoc::indoc;
 
 #[test]
@@ -74,7 +74,7 @@ fn merge() {
                 let merged2 = new Map([...second, ...third]);
             "#}),
         TestAction::assert_eq("merged1.size", 3),
-        TestAction::assert_eq("merged1.get('2')", "second two"),
+        TestAction::assert_eq("merged1.get('2')", js_string!("second two")),
         TestAction::assert_eq("merged2.size", 4),
     ]);
 }
@@ -85,8 +85,8 @@ fn get() {
         TestAction::run(indoc! {r#"
                 let map = new Map([["1", "one"], ["2", "two"]]);
             "#}),
-        TestAction::assert_eq("map.get('1')", "one"),
-        TestAction::assert_eq("map.get('2')", "two"),
+        TestAction::assert_eq("map.get('1')", js_string!("one")),
+        TestAction::assert_eq("map.get('2')", js_string!("two")),
         TestAction::assert_eq("map.get('3')", JsValue::undefined()),
         TestAction::assert_eq("map.get()", JsValue::undefined()),
     ]);
@@ -98,7 +98,7 @@ fn set() {
         TestAction::run("let map = new Map();"),
         TestAction::assert("map.set(); map.has(undefined)"),
         TestAction::assert_eq("map.get()", JsValue::undefined()),
-        TestAction::assert_eq("map.set('1', 'one'); map.get('1')", "one"),
+        TestAction::assert_eq("map.set('1', 'one'); map.get('1')", js_string!("one")),
         TestAction::assert("map.set('2'); map.has('2')"),
         TestAction::assert_eq("map.get('2')", JsValue::undefined()),
     ]);
@@ -148,7 +148,7 @@ fn keys() {
                 let item2 = keysIterator.next();
                 let item3 = keysIterator.next();
             "#}),
-        TestAction::assert_eq("item1.value", "0"),
+        TestAction::assert_eq("item1.value", js_string!("0")),
         TestAction::assert_eq("item2.value", 1),
         TestAction::assert("item3.done"),
     ]);
@@ -187,8 +187,8 @@ fn values() {
                 let item2 = valuesIterator.next();
                 let item3 = valuesIterator.next();
             "#}),
-        TestAction::assert_eq("item1.value", "foo"),
-        TestAction::assert_eq("item2.value", "bar"),
+        TestAction::assert_eq("item1.value", js_string!("foo")),
+        TestAction::assert_eq("item2.value", js_string!("bar")),
         TestAction::assert("item3.done"),
     ]);
 }
@@ -201,7 +201,7 @@ fn modify_key() {
                 let map = new Map([[obj, "one"]]);
                 obj.field = "Value";
             "#}),
-        TestAction::assert_eq("map.get(obj)", "one"),
+        TestAction::assert_eq("map.get(obj)", js_string!("one")),
     ]);
 }
 

boa_engine/src/builtins/math/mod.rs

@@ -12,9 +12,9 @@
 //! [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math
 
 use crate::{
-    builtins::BuiltInObject, context::intrinsics::Intrinsics, object::JsObject,
-    property::Attribute, realm::Realm, string::utf16, symbol::JsSymbol, Context, JsArgs, JsResult,
-    JsValue,
+    builtins::BuiltInObject, context::intrinsics::Intrinsics, js_string, object::JsObject,
+    property::Attribute, realm::Realm, string::common::StaticJsStrings, symbol::JsSymbol, Context,
+    JsArgs, JsResult, JsString, JsValue,
 };
 use boa_profiler::Profiler;
 
@@ -29,57 +29,57 @@ pub(crate) struct Math;
 
 impl IntrinsicObject for Math {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         let attribute = Attribute::READONLY | Attribute::NON_ENUMERABLE | Attribute::PERMANENT;
         BuiltInBuilder::with_intrinsic::<Self>(realm)
-            .static_property(utf16!("E"), std::f64::consts::E, attribute)
-            .static_property(utf16!("LN10"), std::f64::consts::LN_10, attribute)
-            .static_property(utf16!("LN2"), std::f64::consts::LN_2, attribute)
-            .static_property(utf16!("LOG10E"), std::f64::consts::LOG10_E, attribute)
-            .static_property(utf16!("LOG2E"), std::f64::consts::LOG2_E, attribute)
-            .static_property(utf16!("PI"), std::f64::consts::PI, attribute)
+            .static_property(js_string!("E"), std::f64::consts::E, attribute)
+            .static_property(js_string!("LN10"), std::f64::consts::LN_10, attribute)
+            .static_property(js_string!("LN2"), std::f64::consts::LN_2, attribute)
+            .static_property(js_string!("LOG10E"), std::f64::consts::LOG10_E, attribute)
+            .static_property(js_string!("LOG2E"), std::f64::consts::LOG2_E, attribute)
+            .static_property(js_string!("PI"), std::f64::consts::PI, attribute)
             .static_property(
-                utf16!("SQRT1_2"),
+                js_string!("SQRT1_2"),
                 std::f64::consts::FRAC_1_SQRT_2,
                 attribute,
             )
-            .static_property(utf16!("SQRT2"), std::f64::consts::SQRT_2, attribute)
-            .static_method(Self::abs, "abs", 1)
-            .static_method(Self::acos, "acos", 1)
-            .static_method(Self::acosh, "acosh", 1)
-            .static_method(Self::asin, "asin", 1)
-            .static_method(Self::asinh, "asinh", 1)
-            .static_method(Self::atan, "atan", 1)
-            .static_method(Self::atanh, "atanh", 1)
-            .static_method(Self::atan2, "atan2", 2)
-            .static_method(Self::cbrt, "cbrt", 1)
-            .static_method(Self::ceil, "ceil", 1)
-            .static_method(Self::clz32, "clz32", 1)
-            .static_method(Self::cos, "cos", 1)
-            .static_method(Self::cosh, "cosh", 1)
-            .static_method(Self::exp, "exp", 1)
-            .static_method(Self::expm1, "expm1", 1)
-            .static_method(Self::floor, "floor", 1)
-            .static_method(Self::fround, "fround", 1)
-            .static_method(Self::hypot, "hypot", 2)
-            .static_method(Self::imul, "imul", 2)
-            .static_method(Self::log, "log", 1)
-            .static_method(Self::log1p, "log1p", 1)
-            .static_method(Self::log10, "log10", 1)
-            .static_method(Self::log2, "log2", 1)
-            .static_method(Self::max, "max", 2)
-            .static_method(Self::min, "min", 2)
-            .static_method(Self::pow, "pow", 2)
-            .static_method(Self::random, "random", 0)
-            .static_method(Self::round, "round", 1)
-            .static_method(Self::sign, "sign", 1)
-            .static_method(Self::sin, "sin", 1)
-            .static_method(Self::sinh, "sinh", 1)
-            .static_method(Self::sqrt, "sqrt", 1)
-            .static_method(Self::tan, "tan", 1)
-            .static_method(Self::tanh, "tanh", 1)
-            .static_method(Self::trunc, "trunc", 1)
+            .static_property(js_string!("SQRT2"), std::f64::consts::SQRT_2, attribute)
+            .static_method(Self::abs, js_string!("abs"), 1)
+            .static_method(Self::acos, js_string!("acos"), 1)
+            .static_method(Self::acosh, js_string!("acosh"), 1)
+            .static_method(Self::asin, js_string!("asin"), 1)
+            .static_method(Self::asinh, js_string!("asinh"), 1)
+            .static_method(Self::atan, js_string!("atan"), 1)
+            .static_method(Self::atanh, js_string!("atanh"), 1)
+            .static_method(Self::atan2, js_string!("atan2"), 2)
+            .static_method(Self::cbrt, js_string!("cbrt"), 1)
+            .static_method(Self::ceil, js_string!("ceil"), 1)
+            .static_method(Self::clz32, js_string!("clz32"), 1)
+            .static_method(Self::cos, js_string!("cos"), 1)
+            .static_method(Self::cosh, js_string!("cosh"), 1)
+            .static_method(Self::exp, js_string!("exp"), 1)
+            .static_method(Self::expm1, js_string!("expm1"), 1)
+            .static_method(Self::floor, js_string!("floor"), 1)
+            .static_method(Self::fround, js_string!("fround"), 1)
+            .static_method(Self::hypot, js_string!("hypot"), 2)
+            .static_method(Self::imul, js_string!("imul"), 2)
+            .static_method(Self::log, js_string!("log"), 1)
+            .static_method(Self::log1p, js_string!("log1p"), 1)
+            .static_method(Self::log10, js_string!("log10"), 1)
+            .static_method(Self::log2, js_string!("log2"), 1)
+            .static_method(Self::max, js_string!("max"), 2)
+            .static_method(Self::min, js_string!("min"), 2)
+            .static_method(Self::pow, js_string!("pow"), 2)
+            .static_method(Self::random, js_string!("random"), 0)
+            .static_method(Self::round, js_string!("round"), 1)
+            .static_method(Self::sign, js_string!("sign"), 1)
+            .static_method(Self::sin, js_string!("sin"), 1)
+            .static_method(Self::sinh, js_string!("sinh"), 1)
+            .static_method(Self::sqrt, js_string!("sqrt"), 1)
+            .static_method(Self::tan, js_string!("tan"), 1)
+            .static_method(Self::tanh, js_string!("tanh"), 1)
+            .static_method(Self::trunc, js_string!("trunc"), 1)
             .static_property(
                 JsSymbol::to_string_tag(),
                 Self::NAME,
@@ -94,7 +94,7 @@ impl IntrinsicObject for Math {
 }
 
 impl BuiltInObject for Math {
-    const NAME: &'static str = "Math";
+    const NAME: JsString = StaticJsStrings::MATH;
 }
 
 impl Math {

boa_engine/src/builtins/mod.rs

@@ -137,7 +137,7 @@ pub(crate) trait BuiltInObject: IntrinsicObject {
     /// E.g. If you want access the properties of a `Complex` built-in with the name `Cplx` you must
     /// assign `"Cplx"` to this constant, making any property inside it accessible from ECMAScript
     /// as `Cplx.prop`
-    const NAME: &'static str;
+    const NAME: JsString;
 
     /// Property attribute flags of the built-in. Check [`Attribute`] for more information.
     const ATTRIBUTE: Attribute = Attribute::WRITABLE
@@ -649,8 +649,8 @@ impl BuiltInConstructorWithPrototype<'_> {
     /// Specify the name of the constructor function.
     ///
     /// Default is `""`
-    fn name<N: Into<JsString>>(mut self, name: N) -> Self {
-        self.name = name.into();
+    fn name(mut self, name: JsString) -> Self {
+        self.name = name;
         self
     }
 
@@ -826,8 +826,8 @@ impl BuiltInConstructorWithPrototype<'_> {
         let length = self.length;
         let name = self.name.clone();
         let prototype = self.prototype.clone();
-        self = self.static_property("length", length, Attribute::CONFIGURABLE);
-        self = self.static_property("name", name, Attribute::CONFIGURABLE);
+        self = self.static_property(js_string!("length"), length, Attribute::CONFIGURABLE);
+        self = self.static_property(js_string!("name"), name, Attribute::CONFIGURABLE);
         self = self.static_property(PROTOTYPE, prototype, Attribute::empty());
 
         let attributes = self.attributes;
@@ -877,8 +877,8 @@ impl BuiltInConstructorWithPrototype<'_> {
 
         let length = self.length;
         let name = self.name.clone();
-        self = self.static_property("length", length, Attribute::CONFIGURABLE);
-        self = self.static_property("name", name, Attribute::CONFIGURABLE);
+        self = self.static_property(js_string!("length"), length, Attribute::CONFIGURABLE);
+        self = self.static_property(js_string!("name"), name, Attribute::CONFIGURABLE);
 
         let mut object = self.object.borrow_mut();
         *object.kind_mut() = ObjectKind::Function(function);
@@ -916,8 +916,8 @@ impl BuiltInCallable<'_> {
     /// Specify the name of the constructor function.
     ///
     /// Default is `""`
-    fn name<N: Into<JsString>>(mut self, name: N) -> Self {
-        self.name = name.into();
+    fn name(mut self, name: JsString) -> Self {
+        self.name = name;
         self
     }
 
@@ -1074,8 +1074,8 @@ impl<FnTyp> BuiltInBuilder<'_, Callable<FnTyp>> {
     /// Specify the name of the constructor function.
     ///
     /// Default is `""`
-    fn name<N: Into<JsString>>(mut self, name: N) -> Self {
-        self.kind.name = name.into();
+    fn name(mut self, name: JsString) -> Self {
+        self.kind.name = name;
         self
     }
 }

boa_engine/src/builtins/number/globals.rs

@@ -5,8 +5,8 @@ use crate::{
     context::intrinsics::Intrinsics,
     object::JsObject,
     realm::Realm,
-    string::Utf16Trim,
-    Context, JsArgs, JsResult, JsValue,
+    string::{common::StaticJsStrings, Utf16Trim},
+    Context, JsArgs, JsResult, JsString, JsValue,
 };
 
 use num_traits::Num;
@@ -50,7 +50,7 @@ impl IntrinsicObject for IsFinite {
 }
 
 impl BuiltInObject for IsFinite {
-    const NAME: &'static str = "isFinite";
+    const NAME: JsString = StaticJsStrings::IS_FINITE;
 }
 
 /// Builtin javascript 'isNaN(number)' function.
@@ -96,7 +96,7 @@ impl IntrinsicObject for IsNaN {
 }
 
 impl BuiltInObject for IsNaN {
-    const NAME: &'static str = "isNaN";
+    const NAME: JsString = StaticJsStrings::IS_NAN;
 }
 
 /// Builtin javascript 'parseInt(str, radix)' function.
@@ -237,7 +237,7 @@ impl IntrinsicObject for ParseInt {
 }
 
 impl BuiltInObject for ParseInt {
-    const NAME: &'static str = "parseInt";
+    const NAME: JsString = StaticJsStrings::PARSE_INT;
 }
 
 /// Builtin javascript 'parseFloat(str)' function.
@@ -310,5 +310,5 @@ impl IntrinsicObject for ParseFloat {
 }
 
 impl BuiltInObject for ParseFloat {
-    const NAME: &'static str = "parseFloat";
+    const NAME: JsString = StaticJsStrings::PARSE_FLOAT;
 }

boa_engine/src/builtins/number/mod.rs

@@ -17,12 +17,13 @@ use crate::{
     builtins::BuiltInObject,
     context::intrinsics::{Intrinsics, StandardConstructor, StandardConstructors},
     error::JsNativeError,
+    js_string,
     object::{internal_methods::get_prototype_from_constructor, JsObject, ObjectData},
     property::Attribute,
     realm::Realm,
-    string::utf16,
+    string::common::StaticJsStrings,
     value::{AbstractRelation, IntegerOrInfinity, JsValue},
-    Context, JsArgs, JsResult,
+    Context, JsArgs, JsResult, JsString,
 };
 use boa_profiler::Profiler;
 use num_traits::float::FloatCore;
@@ -47,47 +48,51 @@ pub(crate) struct Number;
 
 impl IntrinsicObject for Number {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         let attribute = Attribute::READONLY | Attribute::NON_ENUMERABLE | Attribute::PERMANENT;
 
         BuiltInBuilder::from_standard_constructor::<Self>(realm)
-            .static_property(utf16!("EPSILON"), f64::EPSILON, attribute)
+            .static_property(js_string!("EPSILON"), f64::EPSILON, attribute)
             .static_property(
-                utf16!("MAX_SAFE_INTEGER"),
+                js_string!("MAX_SAFE_INTEGER"),
                 Self::MAX_SAFE_INTEGER,
                 attribute,
             )
             .static_property(
-                utf16!("MIN_SAFE_INTEGER"),
+                js_string!("MIN_SAFE_INTEGER"),
                 Self::MIN_SAFE_INTEGER,
                 attribute,
             )
-            .static_property(utf16!("MAX_VALUE"), Self::MAX_VALUE, attribute)
-            .static_property(utf16!("MIN_VALUE"), Self::MIN_VALUE, attribute)
-            .static_property(utf16!("NEGATIVE_INFINITY"), f64::NEG_INFINITY, attribute)
-            .static_property(utf16!("POSITIVE_INFINITY"), f64::INFINITY, attribute)
-            .static_property(utf16!("NaN"), f64::NAN, attribute)
+            .static_property(js_string!("MAX_VALUE"), Self::MAX_VALUE, attribute)
+            .static_property(js_string!("MIN_VALUE"), Self::MIN_VALUE, attribute)
             .static_property(
-                utf16!("parseInt"),
+                js_string!("NEGATIVE_INFINITY"),
+                f64::NEG_INFINITY,
+                attribute,
+            )
+            .static_property(js_string!("POSITIVE_INFINITY"), f64::INFINITY, attribute)
+            .static_property(js_string!("NaN"), f64::NAN, attribute)
+            .static_property(
+                js_string!("parseInt"),
                 realm.intrinsics().objects().parse_int(),
                 Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE,
             )
             .static_property(
-                utf16!("parseFloat"),
+                js_string!("parseFloat"),
                 realm.intrinsics().objects().parse_float(),
                 Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE,
             )
-            .static_method(Self::number_is_finite, "isFinite", 1)
-            .static_method(Self::number_is_nan, "isNaN", 1)
-            .static_method(Self::is_safe_integer, "isSafeInteger", 1)
-            .static_method(Self::number_is_integer, "isInteger", 1)
-            .method(Self::to_exponential, "toExponential", 1)
-            .method(Self::to_fixed, "toFixed", 1)
-            .method(Self::to_locale_string, "toLocaleString", 0)
-            .method(Self::to_precision, "toPrecision", 1)
-            .method(Self::to_string, "toString", 1)
-            .method(Self::value_of, "valueOf", 0)
+            .static_method(Self::number_is_finite, js_string!("isFinite"), 1)
+            .static_method(Self::number_is_nan, js_string!("isNaN"), 1)
+            .static_method(Self::is_safe_integer, js_string!("isSafeInteger"), 1)
+            .static_method(Self::number_is_integer, js_string!("isInteger"), 1)
+            .method(Self::to_exponential, js_string!("toExponential"), 1)
+            .method(Self::to_fixed, js_string!("toFixed"), 1)
+            .method(Self::to_locale_string, js_string!("toLocaleString"), 0)
+            .method(Self::to_precision, js_string!("toPrecision"), 1)
+            .method(Self::to_string, js_string!("toString"), 1)
+            .method(Self::value_of, js_string!("valueOf"), 0)
             .build();
     }
 
@@ -97,7 +102,7 @@ impl IntrinsicObject for Number {
 }
 
 impl BuiltInObject for Number {
-    const NAME: &'static str = "Number";
+    const NAME: JsString = StaticJsStrings::NUMBER;
 }
 
 impl BuiltInConstructor for Number {
@@ -222,7 +227,7 @@ impl Number {
         };
         // 4. If x is not finite, return ! Number::toString(x).
         if !this_num.is_finite() {
-            return Ok(JsValue::new(Self::to_native_string(this_num)));
+            return Ok(JsValue::new(Self::to_js_string(this_num)));
         }
         // Get rid of the '-' sign for -0.0
         let this_num = if this_num == 0. { 0. } else { this_num };
@@ -276,7 +281,7 @@ impl Number {
 
         // 6. If x is not finite, return ! Number::toString(x).
         if !this_num.is_finite() {
-            Ok(JsValue::new(Self::to_native_string(this_num)))
+            Ok(JsValue::new(Self::to_js_string(this_num)))
         // 10. If x ≥ 10^21, then let m be ! ToString(𝔽(x)).
         } else if this_num >= 1.0e21 {
             Ok(JsValue::new(f64_to_exponential(this_num)))
@@ -284,7 +289,7 @@ impl Number {
             // Get rid of the '-' sign for -0.0 because of 9. If x < 0, then set s to "-".
             let this_num = if this_num == 0_f64 { 0_f64 } else { this_num };
             let this_fixed_num = format!("{this_num:.precision$}");
-            Ok(JsValue::new(this_fixed_num))
+            Ok(JsValue::new(js_string!(this_fixed_num)))
         }
     }
 
@@ -309,7 +314,7 @@ impl Number {
     ) -> JsResult<JsValue> {
         let this_num = Self::this_number_value(this)?;
         let this_str_num = this_num.to_string();
-        Ok(JsValue::new(this_str_num))
+        Ok(JsValue::new(js_string!(this_str_num)))
     }
 
     /// `flt_str_to_exp` - used in `to_precision`
@@ -494,14 +499,14 @@ impl Number {
                 // iv, v
                 suffix.push_str(&exponent.to_string());
 
-                return Ok(JsValue::new(prefix + &suffix));
+                return Ok(JsValue::new(js_string!(prefix + &suffix)));
             }
         }
 
         // 11
         let e_inc = exponent + 1;
         if e_inc == precision_i32 {
-            return Ok(JsValue::new(prefix + &suffix));
+            return Ok(JsValue::new(js_string!(prefix + &suffix)));
         }
 
         // 12
@@ -515,7 +520,7 @@ impl Number {
         }
 
         // 14
-        Ok(JsValue::new(prefix + &suffix))
+        Ok(JsValue::new(js_string!(prefix + &suffix)))
     }
 
     // https://golang.org/src/math/nextafter.go
@@ -535,7 +540,7 @@ impl Number {
 
     // https://chromium.googlesource.com/v8/v8/+/refs/heads/master/src/numbers/conversions.cc#1230
     #[allow(clippy::wrong_self_convention)]
-    pub(crate) fn to_native_string_radix(mut value: f64, radix: u8) -> String {
+    pub(crate) fn to_js_string_radix(mut value: f64, radix: u8) -> JsString {
         assert!(radix >= 2);
         assert!(radix <= 36);
         assert!(value.is_finite());
@@ -639,13 +644,15 @@ impl Number {
 
         let integer_cursor = int_iter.next().expect("integer buffer exhausted").0 + 1;
         let fraction_cursor = fraction_cursor + BUF_SIZE / 2;
-        String::from_utf8_lossy(&buffer[integer_cursor..fraction_cursor]).into()
+        js_string!(&*String::from_utf8_lossy(
+            &buffer[integer_cursor..fraction_cursor]
+        ))
     }
 
     #[allow(clippy::wrong_self_convention)]
-    pub(crate) fn to_native_string(x: f64) -> String {
+    pub(crate) fn to_js_string(x: f64) -> JsString {
         let mut buffer = ryu_js::Buffer::new();
-        buffer.format(x).to_string()
+        js_string!(buffer.format(x).to_string())
     }
 
     /// `Number.prototype.toString( [radix] )`
@@ -686,17 +693,17 @@ impl Number {
 
         // 5. If radixNumber = 10, return ! ToString(x).
         if radix_number == 10 {
-            return Ok(JsValue::new(Self::to_native_string(x)));
+            return Ok(JsValue::new(Self::to_js_string(x)));
         }
 
         if x == -0. {
-            return Ok(JsValue::new("0"));
+            return Ok(JsValue::new(js_string!("0")));
         } else if x.is_nan() {
-            return Ok(JsValue::new("NaN"));
+            return Ok(JsValue::new(js_string!("NaN")));
         } else if x.is_infinite() && x.is_sign_positive() {
-            return Ok(JsValue::new("Infinity"));
+            return Ok(JsValue::new(js_string!("Infinity")));
         } else if x.is_infinite() && x.is_sign_negative() {
-            return Ok(JsValue::new("-Infinity"));
+            return Ok(JsValue::new(js_string!("-Infinity")));
         }
 
         // This is a Optimization from the v8 source code to print values that can fit in a single character
@@ -708,7 +715,7 @@ impl Number {
         // }
 
         // 6. Return the String representation of this Number value using the radix specified by radixNumber.
-        Ok(JsValue::new(Self::to_native_string_radix(x, radix_number)))
+        Ok(JsValue::new(Self::to_js_string_radix(x, radix_number)))
     }
 
     /// `Number.prototype.toString()`
@@ -920,22 +927,22 @@ impl Number {
 }
 
 /// Helper function that formats a float as a ES6-style exponential number string.
-fn f64_to_exponential(n: f64) -> String {
-    match n.abs() {
+fn f64_to_exponential(n: f64) -> JsString {
+    js_string!(match n.abs() {
         x if x >= 1.0 || x == 0.0 => format!("{n:e}").replace('e', "e+"),
         _ => format!("{n:e}"),
-    }
+    })
 }
 
 /// Helper function that formats a float as a ES6-style exponential number string with a given precision.
 // We can't use the same approach as in `f64_to_exponential`
 // because in cases like (0.999).toExponential(0) the result will be 1e0.
 // Instead we get the index of 'e', and if the next character is not '-' we insert the plus sign
-fn f64_to_exponential_with_precision(n: f64, prec: usize) -> String {
+fn f64_to_exponential_with_precision(n: f64, prec: usize) -> JsString {
     let mut res = format!("{n:.prec$e}");
     let idx = res.find('e').expect("'e' not found in exponential string");
     if res.as_bytes()[idx + 1] != b'-' {
         res.insert(idx + 1, '+');
     }
-    res
+    js_string!(res)
 }

boa_engine/src/builtins/number/tests.rs

@@ -1,10 +1,11 @@
 use crate::{
-    builtins::Number, run_test_actions, value::AbstractRelation, JsNativeErrorKind, TestAction,
+    builtins::Number, js_string, run_test_actions, value::AbstractRelation, JsNativeErrorKind,
+    TestAction,
 };
 
 #[test]
 fn integer_number_primitive_to_number_object() {
-    run_test_actions([TestAction::assert_eq("(100).toString()", "100")]);
+    run_test_actions([TestAction::assert_eq("(100).toString()", js_string!("100"))]);
 }
 
 #[test]
@@ -24,23 +25,29 @@ fn call_number() {
 #[test]
 fn to_exponential() {
     run_test_actions([
-        TestAction::assert_eq("Number().toExponential()", "0e+0"),
-        TestAction::assert_eq("Number(5).toExponential()", "5e+0"),
-        TestAction::assert_eq("Number(1.234).toExponential()", "1.234e+0"),
-        TestAction::assert_eq("Number(1234).toExponential()", "1.234e+3"),
-        TestAction::assert_eq("Number('I am also not a number').toExponential()", "NaN"),
-        TestAction::assert_eq("Number('1.23e+2').toExponential()", "1.23e+2"),
+        TestAction::assert_eq("Number().toExponential()", js_string!("0e+0")),
+        TestAction::assert_eq("Number(5).toExponential()", js_string!("5e+0")),
+        TestAction::assert_eq("Number(1.234).toExponential()", js_string!("1.234e+0")),
+        TestAction::assert_eq("Number(1234).toExponential()", js_string!("1.234e+3")),
+        TestAction::assert_eq(
+            "Number('I am also not a number').toExponential()",
+            js_string!("NaN"),
+        ),
+        TestAction::assert_eq("Number('1.23e+2').toExponential()", js_string!("1.23e+2")),
     ]);
 }
 
 #[test]
 fn to_fixed() {
     run_test_actions([
-        TestAction::assert_eq("Number().toFixed()", "0"),
-        TestAction::assert_eq("Number('3.456e+4').toFixed()", "34560"),
-        TestAction::assert_eq("Number('3.456e-4').toFixed()", "0"),
-        TestAction::assert_eq("Number(5).toFixed()", "5"),
-        TestAction::assert_eq("Number('I am also not a number').toFixed()", "NaN"),
+        TestAction::assert_eq("Number().toFixed()", js_string!("0")),
+        TestAction::assert_eq("Number('3.456e+4').toFixed()", js_string!("34560")),
+        TestAction::assert_eq("Number('3.456e-4').toFixed()", js_string!("0")),
+        TestAction::assert_eq("Number(5).toFixed()", js_string!("5")),
+        TestAction::assert_eq(
+            "Number('I am also not a number').toFixed()",
+            js_string!("NaN"),
+        ),
     ]);
 }
 
@@ -49,10 +56,10 @@ fn to_locale_string() {
     // TODO: We don't actually do any locale checking here
     // To honor the spec we should print numbers according to user locale.
     run_test_actions([
-        TestAction::assert_eq("Number().toLocaleString()", "0"),
-        TestAction::assert_eq("Number(5).toLocaleString()", "5"),
-        TestAction::assert_eq("Number('345600').toLocaleString()", "345600"),
-        TestAction::assert_eq("Number(-25).toLocaleString()", "-25"),
+        TestAction::assert_eq("Number().toLocaleString()", js_string!("0")),
+        TestAction::assert_eq("Number(5).toLocaleString()", js_string!("5")),
+        TestAction::assert_eq("Number('345600').toLocaleString()", js_string!("345600")),
+        TestAction::assert_eq("Number(-25).toLocaleString()", js_string!("-25")),
     ]);
 }
 
@@ -60,21 +67,21 @@ fn to_locale_string() {
 fn to_precision() {
     const ERROR: &str = "precision must be an integer at least 1 and no greater than 100";
     run_test_actions([
-        TestAction::assert_eq("(1/0).toPrecision(3)", "Infinity"),
-        TestAction::assert_eq("Number().toPrecision()", "0"),
-        TestAction::assert_eq("Number().toPrecision(undefined)", "0"),
-        TestAction::assert_eq("(123456789).toPrecision(1)", "1e+8"),
-        TestAction::assert_eq("(123456789).toPrecision(4)", "1.235e+8"),
-        TestAction::assert_eq("(123456789).toPrecision(9)", "123456789"),
-        TestAction::assert_eq("(-123456789).toPrecision(4)", "-1.235e+8"),
+        TestAction::assert_eq("(1/0).toPrecision(3)", js_string!("Infinity")),
+        TestAction::assert_eq("Number().toPrecision()", js_string!("0")),
+        TestAction::assert_eq("Number().toPrecision(undefined)", js_string!("0")),
+        TestAction::assert_eq("(123456789).toPrecision(1)", js_string!("1e+8")),
+        TestAction::assert_eq("(123456789).toPrecision(4)", js_string!("1.235e+8")),
+        TestAction::assert_eq("(123456789).toPrecision(9)", js_string!("123456789")),
+        TestAction::assert_eq("(-123456789).toPrecision(4)", js_string!("-1.235e+8")),
         TestAction::assert_eq(
             "(123456789).toPrecision(50)",
-            "123456789.00000000000000000000000000000000000000000",
+            js_string!("123456789.00000000000000000000000000000000000000000"),
         ),
-        TestAction::assert_eq("(0.1).toPrecision(4)", "0.1000"),
+        TestAction::assert_eq("(0.1).toPrecision(4)", js_string!("0.1000")),
         TestAction::assert_eq(
             "(1/3).toPrecision(60)",
-            "0.333333333333333314829616256247390992939472198486328125000000",
+            js_string!("0.333333333333333314829616256247390992939472198486328125000000"),
         ),
         TestAction::assert_native_error("(1).toPrecision(101)", JsNativeErrorKind::Range, ERROR),
         TestAction::assert_native_error("(1).toPrecision(0)", JsNativeErrorKind::Range, ERROR),
@@ -86,90 +93,132 @@ fn to_precision() {
 #[test]
 fn to_string() {
     run_test_actions([
-        TestAction::assert_eq("Number(NaN).toString()", "NaN"),
-        TestAction::assert_eq("Number(1/0).toString()", "Infinity"),
-        TestAction::assert_eq("Number(-1/0).toString()", "-Infinity"),
-        TestAction::assert_eq("Number(0).toString()", "0"),
-        TestAction::assert_eq("Number(9).toString()", "9"),
-        TestAction::assert_eq("Number(90).toString()", "90"),
-        TestAction::assert_eq("Number(90.12).toString()", "90.12"),
-        TestAction::assert_eq("Number(0.1).toString()", "0.1"),
-        TestAction::assert_eq("Number(0.01).toString()", "0.01"),
-        TestAction::assert_eq("Number(0.0123).toString()", "0.0123"),
-        TestAction::assert_eq("Number(0.00001).toString()", "0.00001"),
-        TestAction::assert_eq("Number(0.000001).toString()", "0.000001"),
-        TestAction::assert_eq("Number(NaN).toString(16)", "NaN"),
-        TestAction::assert_eq("Number(1/0).toString(16)", "Infinity"),
-        TestAction::assert_eq("Number(-1/0).toString(16)", "-Infinity"),
-        TestAction::assert_eq("Number(0).toString(16)", "0"),
-        TestAction::assert_eq("Number(9).toString(16)", "9"),
-        TestAction::assert_eq("Number(90).toString(16)", "5a"),
-        TestAction::assert_eq("Number(90.12).toString(16)", "5a.1eb851eb852"),
-        TestAction::assert_eq("Number(0.1).toString(16)", "0.1999999999999a"),
-        TestAction::assert_eq("Number(0.01).toString(16)", "0.028f5c28f5c28f6"),
-        TestAction::assert_eq("Number(0.0123).toString(16)", "0.032617c1bda511a"),
+        TestAction::assert_eq("Number(NaN).toString()", js_string!("NaN")),
+        TestAction::assert_eq("Number(1/0).toString()", js_string!("Infinity")),
+        TestAction::assert_eq("Number(-1/0).toString()", js_string!("-Infinity")),
+        TestAction::assert_eq("Number(0).toString()", js_string!("0")),
+        TestAction::assert_eq("Number(9).toString()", js_string!("9")),
+        TestAction::assert_eq("Number(90).toString()", js_string!("90")),
+        TestAction::assert_eq("Number(90.12).toString()", js_string!("90.12")),
+        TestAction::assert_eq("Number(0.1).toString()", js_string!("0.1")),
+        TestAction::assert_eq("Number(0.01).toString()", js_string!("0.01")),
+        TestAction::assert_eq("Number(0.0123).toString()", js_string!("0.0123")),
+        TestAction::assert_eq("Number(0.00001).toString()", js_string!("0.00001")),
+        TestAction::assert_eq("Number(0.000001).toString()", js_string!("0.000001")),
+        TestAction::assert_eq("Number(NaN).toString(16)", js_string!("NaN")),
+        TestAction::assert_eq("Number(1/0).toString(16)", js_string!("Infinity")),
+        TestAction::assert_eq("Number(-1/0).toString(16)", js_string!("-Infinity")),
+        TestAction::assert_eq("Number(0).toString(16)", js_string!("0")),
+        TestAction::assert_eq("Number(9).toString(16)", js_string!("9")),
+        TestAction::assert_eq("Number(90).toString(16)", js_string!("5a")),
+        TestAction::assert_eq("Number(90.12).toString(16)", js_string!("5a.1eb851eb852")),
+        TestAction::assert_eq("Number(0.1).toString(16)", js_string!("0.1999999999999a")),
+        TestAction::assert_eq("Number(0.01).toString(16)", js_string!("0.028f5c28f5c28f6")),
+        TestAction::assert_eq(
+            "Number(0.0123).toString(16)",
+            js_string!("0.032617c1bda511a"),
+        ),
         TestAction::assert_eq(
             "Number(111111111111111111111).toString(16)",
-            "605f9f6dd18bc8000",
+            js_string!("605f9f6dd18bc8000"),
         ),
         TestAction::assert_eq(
             "Number(1111111111111111111111).toString(16)",
-            "3c3bc3a4a2f75c0000",
+            js_string!("3c3bc3a4a2f75c0000"),
         ),
         TestAction::assert_eq(
             "Number(11111111111111111111111).toString(16)",
-            "25a55a46e5da9a00000",
+            js_string!("25a55a46e5da9a00000"),
+        ),
+        TestAction::assert_eq(
+            "Number(0.00001).toString(16)",
+            js_string!("0.0000a7c5ac471b4788"),
+        ),
+        TestAction::assert_eq(
+            "Number(0.000001).toString(16)",
+            js_string!("0.000010c6f7a0b5ed8d"),
+        ),
+        TestAction::assert_eq(
+            "Number(0.0000001).toString(16)",
+            js_string!("0.000001ad7f29abcaf48"),
+        ),
+        TestAction::assert_eq(
+            "Number(0.00000012).toString(16)",
+            js_string!("0.000002036565348d256"),
+        ),
+        TestAction::assert_eq(
+            "Number(0.000000123).toString(16)",
+            js_string!("0.0000021047ee22aa466"),
+        ),
+        TestAction::assert_eq(
+            "Number(0.00000001).toString(16)",
+            js_string!("0.0000002af31dc4611874"),
+        ),
+        TestAction::assert_eq(
+            "Number(0.000000012).toString(16)",
+            js_string!("0.000000338a23b87483be"),
         ),
-        TestAction::assert_eq("Number(0.00001).toString(16)", "0.0000a7c5ac471b4788"),
-        TestAction::assert_eq("Number(0.000001).toString(16)", "0.000010c6f7a0b5ed8d"),
-        TestAction::assert_eq("Number(0.0000001).toString(16)", "0.000001ad7f29abcaf48"),
-        TestAction::assert_eq("Number(0.00000012).toString(16)", "0.000002036565348d256"),
-        TestAction::assert_eq("Number(0.000000123).toString(16)", "0.0000021047ee22aa466"),
-        TestAction::assert_eq("Number(0.00000001).toString(16)", "0.0000002af31dc4611874"),
-        TestAction::assert_eq("Number(0.000000012).toString(16)", "0.000000338a23b87483be"),
         TestAction::assert_eq(
             "Number(0.0000000123).toString(16)",
-            "0.00000034d3fe36aaa0a2",
+            js_string!("0.00000034d3fe36aaa0a2"),
         ),
-        TestAction::assert_eq("Number(-0).toString(16)", "0"),
-        TestAction::assert_eq("Number(-9).toString(16)", "-9"),
+        TestAction::assert_eq("Number(-0).toString(16)", js_string!("0")),
+        TestAction::assert_eq("Number(-9).toString(16)", js_string!("-9")),
         //
-        TestAction::assert_eq("Number(-90).toString(16)", "-5a"),
-        TestAction::assert_eq("Number(-90.12).toString(16)", "-5a.1eb851eb852"),
-        TestAction::assert_eq("Number(-0.1).toString(16)", "-0.1999999999999a"),
-        TestAction::assert_eq("Number(-0.01).toString(16)", "-0.028f5c28f5c28f6"),
-        TestAction::assert_eq("Number(-0.0123).toString(16)", "-0.032617c1bda511a"),
+        TestAction::assert_eq("Number(-90).toString(16)", js_string!("-5a")),
+        TestAction::assert_eq("Number(-90.12).toString(16)", js_string!("-5a.1eb851eb852")),
+        TestAction::assert_eq("Number(-0.1).toString(16)", js_string!("-0.1999999999999a")),
+        TestAction::assert_eq(
+            "Number(-0.01).toString(16)",
+            js_string!("-0.028f5c28f5c28f6"),
+        ),
+        TestAction::assert_eq(
+            "Number(-0.0123).toString(16)",
+            js_string!("-0.032617c1bda511a"),
+        ),
         TestAction::assert_eq(
             "Number(-111111111111111111111).toString(16)",
-            "-605f9f6dd18bc8000",
+            js_string!("-605f9f6dd18bc8000"),
         ),
         TestAction::assert_eq(
             "Number(-1111111111111111111111).toString(16)",
-            "-3c3bc3a4a2f75c0000",
+            js_string!("-3c3bc3a4a2f75c0000"),
         ),
         TestAction::assert_eq(
             "Number(-11111111111111111111111).toString(16)",
-            "-25a55a46e5da9a00000",
+            js_string!("-25a55a46e5da9a00000"),
+        ),
+        TestAction::assert_eq(
+            "Number(-0.00001).toString(16)",
+            js_string!("-0.0000a7c5ac471b4788"),
+        ),
+        TestAction::assert_eq(
+            "Number(-0.000001).toString(16)",
+            js_string!("-0.000010c6f7a0b5ed8d"),
+        ),
+        TestAction::assert_eq(
+            "Number(-0.0000001).toString(16)",
+            js_string!("-0.000001ad7f29abcaf48"),
+        ),
+        TestAction::assert_eq(
+            "Number(-0.00000012).toString(16)",
+            js_string!("-0.000002036565348d256"),
         ),
-        TestAction::assert_eq("Number(-0.00001).toString(16)", "-0.0000a7c5ac471b4788"),
-        TestAction::assert_eq("Number(-0.000001).toString(16)", "-0.000010c6f7a0b5ed8d"),
-        TestAction::assert_eq("Number(-0.0000001).toString(16)", "-0.000001ad7f29abcaf48"),
-        TestAction::assert_eq("Number(-0.00000012).toString(16)", "-0.000002036565348d256"),
         TestAction::assert_eq(
             "Number(-0.000000123).toString(16)",
-            "-0.0000021047ee22aa466",
+            js_string!("-0.0000021047ee22aa466"),
         ),
         TestAction::assert_eq(
             "Number(-0.00000001).toString(16)",
-            "-0.0000002af31dc4611874",
+            js_string!("-0.0000002af31dc4611874"),
         ),
         TestAction::assert_eq(
             "Number(-0.000000012).toString(16)",
-            "-0.000000338a23b87483be",
+            js_string!("-0.000000338a23b87483be"),
         ),
         TestAction::assert_eq(
             "Number(-0.0000000123).toString(16)",
-            "-0.00000034d3fe36aaa0a2",
+            js_string!("-0.00000034d3fe36aaa0a2"),
         ),
     ]);
 }
@@ -177,26 +226,26 @@ fn to_string() {
 #[test]
 fn num_to_string_exponential() {
     run_test_actions([
-        TestAction::assert_eq("(0).toString()", "0"),
-        TestAction::assert_eq("(-0).toString()", "0"),
+        TestAction::assert_eq("(0).toString()", js_string!("0")),
+        TestAction::assert_eq("(-0).toString()", js_string!("0")),
         TestAction::assert_eq(
             "(111111111111111111111).toString()",
-            "111111111111111110000",
+            js_string!("111111111111111110000"),
         ),
         TestAction::assert_eq(
             "(1111111111111111111111).toString()",
-            "1.1111111111111111e+21",
+            js_string!("1.1111111111111111e+21"),
         ),
         TestAction::assert_eq(
             "(11111111111111111111111).toString()",
-            "1.1111111111111111e+22",
-        ),
-        TestAction::assert_eq("(0.0000001).toString()", "1e-7"),
-        TestAction::assert_eq("(0.00000012).toString()", "1.2e-7"),
-        TestAction::assert_eq("(0.000000123).toString()", "1.23e-7"),
-        TestAction::assert_eq("(0.00000001).toString()", "1e-8"),
-        TestAction::assert_eq("(0.000000012).toString()", "1.2e-8"),
-        TestAction::assert_eq("(0.0000000123).toString()", "1.23e-8"),
+            js_string!("1.1111111111111111e+22"),
+        ),
+        TestAction::assert_eq("(0.0000001).toString()", js_string!("1e-7")),
+        TestAction::assert_eq("(0.00000012).toString()", js_string!("1.2e-7")),
+        TestAction::assert_eq("(0.000000123).toString()", js_string!("1.23e-7")),
+        TestAction::assert_eq("(0.00000001).toString()", js_string!("1e-8")),
+        TestAction::assert_eq("(0.000000012).toString()", js_string!("1.2e-8")),
+        TestAction::assert_eq("(0.0000000123).toString()", js_string!("1.23e-8")),
     ]);
 }
 
@@ -475,7 +524,13 @@ fn number_is_safe_integer() {
 #[test]
 fn issue_2717() {
     run_test_actions([
-        TestAction::assert_eq("(0.1600057092765239).toString(36)", "0.5rd85dm1ixq"),
-        TestAction::assert_eq("(0.23046743672210102).toString(36)", "0.8aoosla2phj"),
+        TestAction::assert_eq(
+            "(0.1600057092765239).toString(36)",
+            js_string!("0.5rd85dm1ixq"),
+        ),
+        TestAction::assert_eq(
+            "(0.23046743672210102).toString(36)",
+            js_string!("0.8aoosla2phj"),
+        ),
     ]);
 }

boa_engine/src/builtins/object/for_in_iterator.rs

@@ -12,6 +12,7 @@ use crate::{
     builtins::{iterable::create_iter_result_object, BuiltInBuilder, IntrinsicObject},
     context::intrinsics::Intrinsics,
     error::JsNativeError,
+    js_string,
     object::{JsObject, ObjectData},
     property::PropertyKey,
     realm::Realm,
@@ -39,7 +40,7 @@ pub struct ForInIterator {
 
 impl IntrinsicObject for ForInIterator {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event("ForInIterator", "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         BuiltInBuilder::with_intrinsic::<Self>(realm)
             .prototype(
@@ -49,7 +50,7 @@ impl IntrinsicObject for ForInIterator {
                     .iterator_prototypes()
                     .iterator(),
             )
-            .static_method(Self::next, "next", 0)
+            .static_method(Self::next, js_string!("next"), 0)
             .build();
     }
 

boa_engine/src/builtins/object/mod.rs

@@ -28,7 +28,7 @@ use crate::{
     },
     property::{Attribute, PropertyDescriptor, PropertyKey, PropertyNameKind},
     realm::Realm,
-    string::utf16,
+    string::{common::StaticJsStrings, utf16},
     symbol::JsSymbol,
     value::JsValue,
     Context, JsArgs, JsResult, JsString,
@@ -46,14 +46,14 @@ pub struct Object;
 
 impl IntrinsicObject for Object {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         let legacy_proto_getter = BuiltInBuilder::callable(realm, Self::legacy_proto_getter)
-            .name("get __proto__")
+            .name(js_string!("get __proto__"))
             .build();
 
         let legacy_setter_proto = BuiltInBuilder::callable(realm, Self::legacy_proto_setter)
-            .name("set __proto__")
+            .name(js_string!("set __proto__"))
             .build();
 
         BuiltInBuilder::from_standard_constructor::<Self>(realm)
@@ -64,46 +64,74 @@ impl IntrinsicObject for Object {
                 Some(legacy_setter_proto),
                 Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE,
             )
-            .method(Self::has_own_property, "hasOwnProperty", 1)
-            .method(Self::property_is_enumerable, "propertyIsEnumerable", 1)
-            .method(Self::to_string, "toString", 0)
-            .method(Self::to_locale_string, "toLocaleString", 0)
-            .method(Self::value_of, "valueOf", 0)
-            .method(Self::is_prototype_of, "isPrototypeOf", 1)
-            .method(Self::legacy_define_getter, "__defineGetter__", 2)
-            .method(Self::legacy_define_setter, "__defineSetter__", 2)
-            .method(Self::legacy_lookup_getter, "__lookupGetter__", 1)
-            .method(Self::legacy_lookup_setter, "__lookupSetter__", 1)
-            .static_method(Self::create, "create", 2)
-            .static_method(Self::set_prototype_of, "setPrototypeOf", 2)
-            .static_method(Self::get_prototype_of, "getPrototypeOf", 1)
-            .static_method(Self::define_property, "defineProperty", 3)
-            .static_method(Self::define_properties, "defineProperties", 2)
-            .static_method(Self::assign, "assign", 2)
-            .static_method(Self::is, "is", 2)
-            .static_method(Self::keys, "keys", 1)
-            .static_method(Self::values, "values", 1)
-            .static_method(Self::entries, "entries", 1)
-            .static_method(Self::seal, "seal", 1)
-            .static_method(Self::is_sealed, "isSealed", 1)
-            .static_method(Self::freeze, "freeze", 1)
-            .static_method(Self::is_frozen, "isFrozen", 1)
-            .static_method(Self::prevent_extensions, "preventExtensions", 1)
-            .static_method(Self::is_extensible, "isExtensible", 1)
+            .method(Self::has_own_property, js_string!("hasOwnProperty"), 1)
+            .method(
+                Self::property_is_enumerable,
+                js_string!("propertyIsEnumerable"),
+                1,
+            )
+            .method(Self::to_string, js_string!("toString"), 0)
+            .method(Self::to_locale_string, js_string!("toLocaleString"), 0)
+            .method(Self::value_of, js_string!("valueOf"), 0)
+            .method(Self::is_prototype_of, js_string!("isPrototypeOf"), 1)
+            .method(
+                Self::legacy_define_getter,
+                js_string!("__defineGetter__"),
+                2,
+            )
+            .method(
+                Self::legacy_define_setter,
+                js_string!("__defineSetter__"),
+                2,
+            )
+            .method(
+                Self::legacy_lookup_getter,
+                js_string!("__lookupGetter__"),
+                1,
+            )
+            .method(
+                Self::legacy_lookup_setter,
+                js_string!("__lookupSetter__"),
+                1,
+            )
+            .static_method(Self::create, js_string!("create"), 2)
+            .static_method(Self::set_prototype_of, js_string!("setPrototypeOf"), 2)
+            .static_method(Self::get_prototype_of, js_string!("getPrototypeOf"), 1)
+            .static_method(Self::define_property, js_string!("defineProperty"), 3)
+            .static_method(Self::define_properties, js_string!("defineProperties"), 2)
+            .static_method(Self::assign, js_string!("assign"), 2)
+            .static_method(Self::is, js_string!("is"), 2)
+            .static_method(Self::keys, js_string!("keys"), 1)
+            .static_method(Self::values, js_string!("values"), 1)
+            .static_method(Self::entries, js_string!("entries"), 1)
+            .static_method(Self::seal, js_string!("seal"), 1)
+            .static_method(Self::is_sealed, js_string!("isSealed"), 1)
+            .static_method(Self::freeze, js_string!("freeze"), 1)
+            .static_method(Self::is_frozen, js_string!("isFrozen"), 1)
+            .static_method(Self::prevent_extensions, js_string!("preventExtensions"), 1)
+            .static_method(Self::is_extensible, js_string!("isExtensible"), 1)
             .static_method(
                 Self::get_own_property_descriptor,
-                "getOwnPropertyDescriptor",
+                js_string!("getOwnPropertyDescriptor"),
                 2,
             )
             .static_method(
                 Self::get_own_property_descriptors,
-                "getOwnPropertyDescriptors",
+                js_string!("getOwnPropertyDescriptors"),
+                1,
+            )
+            .static_method(
+                Self::get_own_property_names,
+                js_string!("getOwnPropertyNames"),
                 1,
             )
-            .static_method(Self::get_own_property_names, "getOwnPropertyNames", 1)
-            .static_method(Self::get_own_property_symbols, "getOwnPropertySymbols", 1)
-            .static_method(Self::has_own, "hasOwn", 2)
-            .static_method(Self::from_entries, "fromEntries", 1)
+            .static_method(
+                Self::get_own_property_symbols,
+                js_string!("getOwnPropertySymbols"),
+                1,
+            )
+            .static_method(Self::has_own, js_string!("hasOwn"), 2)
+            .static_method(Self::from_entries, js_string!("fromEntries"), 1)
             .build();
     }
 
@@ -113,7 +141,7 @@ impl IntrinsicObject for Object {
 }
 
 impl BuiltInObject for Object {
-    const NAME: &'static str = "Object";
+    const NAME: JsString = StaticJsStrings::OBJECT;
 }
 
 impl BuiltInConstructor for Object {
@@ -791,11 +819,11 @@ impl Object {
     ) -> JsResult<JsValue> {
         // 1. If the this value is undefined, return "[object Undefined]".
         if this.is_undefined() {
-            return Ok("[object Undefined]".into());
+            return Ok(js_string!("[object Undefined]").into());
         }
         // 2. If the this value is null, return "[object Null]".
         if this.is_null() {
-            return Ok("[object Null]".into());
+            return Ok(js_string!("[object Null]").into());
         }
         // 3. Let O be ! ToObject(this value).
         let o = this.to_object(context).expect("toObject cannot fail here");
@@ -1391,7 +1419,9 @@ fn get_own_property_keys(
         match (r#type, &next_key) {
             (PropertyKeyType::String, PropertyKey::String(_))
             | (PropertyKeyType::Symbol, PropertyKey::Symbol(_)) => Some(next_key.into()),
-            (PropertyKeyType::String, PropertyKey::Index(index)) => Some(index.to_string().into()),
+            (PropertyKeyType::String, PropertyKey::Index(index)) => {
+                Some(js_string!(index.to_string()).into())
+            }
             _ => None,
         }
     });

boa_engine/src/builtins/object/tests.rs

@@ -1,4 +1,4 @@
-use crate::{run_test_actions, JsNativeErrorKind, JsValue, TestAction};
+use crate::{js_string, run_test_actions, JsNativeErrorKind, JsValue, TestAction};
 use indoc::indoc;
 
 #[test]
@@ -137,18 +137,21 @@ fn object_to_string() {
             "#}),
         TestAction::assert_eq(
             "Object.prototype.toString.call(undefined)",
-            "[object Undefined]",
+            js_string!("[object Undefined]"),
         ),
-        TestAction::assert_eq("Object.prototype.toString.call(null)", "[object Null]"),
-        TestAction::assert_eq("[].toString()", "[object Array]"),
-        TestAction::assert_eq("(() => {}).toString()", "[object Function]"),
-        TestAction::assert_eq("(new Error('')).toString()", "[object Error]"),
-        TestAction::assert_eq("Boolean().toString()", "[object Boolean]"),
-        TestAction::assert_eq("Number(42).toString()", "[object Number]"),
-        TestAction::assert_eq("String('boa').toString()", "[object String]"),
-        TestAction::assert_eq("(new Date()).toString()", "[object Date]"),
-        TestAction::assert_eq("/boa/.toString()", "[object RegExp]"),
-        TestAction::assert_eq("({}).toString()", "[object Object]"),
+        TestAction::assert_eq(
+            "Object.prototype.toString.call(null)",
+            js_string!("[object Null]"),
+        ),
+        TestAction::assert_eq("[].toString()", js_string!("[object Array]")),
+        TestAction::assert_eq("(() => {}).toString()", js_string!("[object Function]")),
+        TestAction::assert_eq("(new Error('')).toString()", js_string!("[object Error]")),
+        TestAction::assert_eq("Boolean().toString()", js_string!("[object Boolean]")),
+        TestAction::assert_eq("Number(42).toString()", js_string!("[object Number]")),
+        TestAction::assert_eq("String('boa').toString()", js_string!("[object String]")),
+        TestAction::assert_eq("(new Date()).toString()", js_string!("[object Date]")),
+        TestAction::assert_eq("/boa/.toString()", js_string!("[object RegExp]")),
+        TestAction::assert_eq("({}).toString()", js_string!("[object Object]")),
     ]);
 }
 
@@ -160,7 +163,7 @@ fn define_symbol_property() {
                 let sym = Symbol("key");
                 Object.defineProperty(obj, sym, { value: "val" });
             "#}),
-        TestAction::assert_eq("obj[sym]", "val"),
+        TestAction::assert_eq("obj[sym]", js_string!("val")),
     ]);
 }
 

boa_engine/src/builtins/promise/mod.rs

@@ -9,6 +9,7 @@ use crate::{
     context::intrinsics::{Intrinsics, StandardConstructor, StandardConstructors},
     error::JsNativeError,
     job::{JobCallback, NativeJob},
+    js_string,
     native_function::NativeFunction,
     object::{
         internal_methods::get_prototype_from_constructor, FunctionObjectBuilder, JsFunction,
@@ -16,10 +17,10 @@ use crate::{
     },
     property::Attribute,
     realm::Realm,
-    string::utf16,
+    string::{common::StaticJsStrings, utf16},
     symbol::JsSymbol,
     value::JsValue,
-    Context, JsArgs, JsError, JsResult,
+    Context, JsArgs, JsError, JsResult, JsString,
 };
 use boa_gc::{custom_trace, Finalize, Gc, GcRefCell, Trace};
 use boa_profiler::Profiler;
@@ -332,28 +333,28 @@ impl PromiseCapability {
 
 impl IntrinsicObject for Promise {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         let get_species = BuiltInBuilder::callable(realm, Self::get_species)
-            .name("get [Symbol.species]")
+            .name(js_string!("get [Symbol.species]"))
             .build();
 
         let builder = BuiltInBuilder::from_standard_constructor::<Self>(realm)
-            .static_method(Self::all, "all", 1)
-            .static_method(Self::all_settled, "allSettled", 1)
-            .static_method(Self::any, "any", 1)
-            .static_method(Self::race, "race", 1)
-            .static_method(Self::reject, "reject", 1)
-            .static_method(Self::resolve, "resolve", 1)
+            .static_method(Self::all, js_string!("all"), 1)
+            .static_method(Self::all_settled, js_string!("allSettled"), 1)
+            .static_method(Self::any, js_string!("any"), 1)
+            .static_method(Self::race, js_string!("race"), 1)
+            .static_method(Self::reject, js_string!("reject"), 1)
+            .static_method(Self::resolve, js_string!("resolve"), 1)
             .static_accessor(
                 JsSymbol::species(),
                 Some(get_species),
                 None,
                 Attribute::CONFIGURABLE,
             )
-            .method(Self::then, "then", 2)
-            .method(Self::catch, "catch", 1)
-            .method(Self::finally, "finally", 1)
+            .method(Self::then, js_string!("then"), 2)
+            .method(Self::catch, js_string!("catch"), 1)
+            .method(Self::finally, js_string!("finally"), 1)
             // <https://tc39.es/ecma262/#sec-promise.prototype-@@tostringtag>
             .property(
                 JsSymbol::to_string_tag(),
@@ -374,7 +375,7 @@ impl IntrinsicObject for Promise {
 }
 
 impl BuiltInObject for Promise {
-    const NAME: &'static str = "Promise";
+    const NAME: JsString = StaticJsStrings::PROMISE;
 }
 
 impl BuiltInConstructor for Promise {
@@ -901,7 +902,11 @@ impl Promise {
                         let obj = JsObject::with_object_proto(context.intrinsics());
 
                         // 10. Perform ! CreateDataPropertyOrThrow(obj, "status", "fulfilled").
-                        obj.create_data_property_or_throw(utf16!("status"), "fulfilled", context)
+                        obj.create_data_property_or_throw(
+                            utf16!("status"),
+                            js_string!("fulfilled"),
+                            context,
+                        )
                         .expect("cannot fail per spec");
 
                         // 11. Perform ! CreateDataPropertyOrThrow(obj, "value", x).
@@ -987,7 +992,11 @@ impl Promise {
                         let obj = JsObject::with_object_proto(context.intrinsics());
 
                         // 10. Perform ! CreateDataPropertyOrThrow(obj, "status", "rejected").
-                        obj.create_data_property_or_throw(utf16!("status"), "rejected", context)
+                        obj.create_data_property_or_throw(
+                            utf16!("status"),
+                            js_string!("rejected"),
+                            context,
+                        )
                         .expect("cannot fail per spec");
 
                         // 11. Perform ! CreateDataPropertyOrThrow(obj, "reason", x).

boa_engine/src/builtins/proxy/mod.rs

@@ -14,11 +14,12 @@ use crate::{
     builtins::BuiltInObject,
     context::intrinsics::{Intrinsics, StandardConstructor, StandardConstructors},
     error::JsNativeError,
+    js_string,
     native_function::NativeFunction,
     object::{FunctionObjectBuilder, JsFunction, JsObject, ObjectData},
     realm::Realm,
-    string::utf16,
-    Context, JsArgs, JsResult, JsValue,
+    string::{common::StaticJsStrings, utf16},
+    Context, JsArgs, JsResult, JsString, JsValue,
 };
 use boa_gc::{Finalize, GcRefCell, Trace};
 use boa_profiler::Profiler;
@@ -33,10 +34,10 @@ pub struct Proxy {
 
 impl IntrinsicObject for Proxy {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         BuiltInBuilder::from_standard_constructor::<Self>(realm)
-            .static_method(Self::revocable, "revocable", 2)
+            .static_method(Self::revocable, js_string!("revocable"), 2)
             .build_without_prototype();
     }
 
@@ -46,7 +47,7 @@ impl IntrinsicObject for Proxy {
 }
 
 impl BuiltInObject for Proxy {
-    const NAME: &'static str = "Proxy";
+    const NAME: JsString = StaticJsStrings::PROXY;
 }
 
 impl BuiltInConstructor for Proxy {

boa_engine/src/builtins/reflect/mod.rs

@@ -15,11 +15,13 @@ use crate::{
     builtins::{self, BuiltInObject},
     context::intrinsics::Intrinsics,
     error::JsNativeError,
+    js_string,
     object::JsObject,
     property::Attribute,
     realm::Realm,
+    string::common::StaticJsStrings,
     symbol::JsSymbol,
-    Context, JsArgs, JsResult, JsValue,
+    Context, JsArgs, JsResult, JsString, JsValue,
 };
 use boa_profiler::Profiler;
 
@@ -32,28 +34,28 @@ pub(crate) struct Reflect;
 
 impl IntrinsicObject for Reflect {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         let to_string_tag = JsSymbol::to_string_tag();
 
         BuiltInBuilder::with_intrinsic::<Self>(realm)
-            .static_method(Self::apply, "apply", 3)
-            .static_method(Self::construct, "construct", 2)
-            .static_method(Self::define_property, "defineProperty", 3)
-            .static_method(Self::delete_property, "deleteProperty", 2)
-            .static_method(Self::get, "get", 2)
+            .static_method(Self::apply, js_string!("apply"), 3)
+            .static_method(Self::construct, js_string!("construct"), 2)
+            .static_method(Self::define_property, js_string!("defineProperty"), 3)
+            .static_method(Self::delete_property, js_string!("deleteProperty"), 2)
+            .static_method(Self::get, js_string!("get"), 2)
             .static_method(
                 Self::get_own_property_descriptor,
-                "getOwnPropertyDescriptor",
+                js_string!("getOwnPropertyDescriptor"),
                 2,
             )
-            .static_method(Self::get_prototype_of, "getPrototypeOf", 1)
-            .static_method(Self::has, "has", 2)
-            .static_method(Self::is_extensible, "isExtensible", 1)
-            .static_method(Self::own_keys, "ownKeys", 1)
-            .static_method(Self::prevent_extensions, "preventExtensions", 1)
-            .static_method(Self::set, "set", 3)
-            .static_method(Self::set_prototype_of, "setPrototypeOf", 2)
+            .static_method(Self::get_prototype_of, js_string!("getPrototypeOf"), 1)
+            .static_method(Self::has, js_string!("has"), 2)
+            .static_method(Self::is_extensible, js_string!("isExtensible"), 1)
+            .static_method(Self::own_keys, js_string!("ownKeys"), 1)
+            .static_method(Self::prevent_extensions, js_string!("preventExtensions"), 1)
+            .static_method(Self::set, js_string!("set"), 3)
+            .static_method(Self::set_prototype_of, js_string!("setPrototypeOf"), 2)
             .static_property(
                 to_string_tag,
                 Self::NAME,
@@ -68,7 +70,7 @@ impl IntrinsicObject for Reflect {
 }
 
 impl BuiltInObject for Reflect {
-    const NAME: &'static str = "Reflect";
+    const NAME: JsString = StaticJsStrings::REFLECT;
 }
 
 impl Reflect {

boa_engine/src/builtins/reflect/tests.rs

@@ -1,4 +1,4 @@
-use crate::{run_test_actions, JsValue, TestAction};
+use crate::{js_string, run_test_actions, JsValue, TestAction};
 use indoc::indoc;
 
 #[test]
@@ -68,7 +68,10 @@ fn get_prototype_of() {
                 function F() { this.p = 42 };
                 let f = new F();
             "#}),
-        TestAction::assert_eq("Reflect.getPrototypeOf(f).constructor.name", "F"),
+        TestAction::assert_eq(
+            "Reflect.getPrototypeOf(f).constructor.name",
+            js_string!("F"),
+        ),
     ]);
 }
 
@@ -131,6 +134,6 @@ fn set_prototype_of() {
                 let obj = {}
                 Reflect.setPrototypeOf(obj, F);
             "#}),
-        TestAction::assert_eq("Reflect.getPrototypeOf(obj).name", "F"),
+        TestAction::assert_eq("Reflect.getPrototypeOf(obj).name", js_string!("F")),
     ]);
 }

boa_engine/src/builtins/regexp/mod.rs

@@ -20,7 +20,7 @@ use crate::{
     },
     property::{Attribute, PropertyDescriptorBuilder},
     realm::Realm,
-    string::{utf16, CodePoint},
+    string::{common::StaticJsStrings, utf16, CodePoint},
     symbol::JsSymbol,
     value::JsValue,
     Context, JsArgs, JsResult, JsString,
@@ -49,40 +49,40 @@ pub struct RegExp {
 
 impl IntrinsicObject for RegExp {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         let get_species = BuiltInBuilder::callable(realm, Self::get_species)
-            .name("get [Symbol.species]")
+            .name(js_string!("get [Symbol.species]"))
             .build();
 
         let flag_attributes = Attribute::CONFIGURABLE | Attribute::NON_ENUMERABLE;
 
         let get_has_indices = BuiltInBuilder::callable(realm, Self::get_has_indices)
-            .name("get hasIndices")
+            .name(js_string!("get hasIndices"))
             .build();
         let get_global = BuiltInBuilder::callable(realm, Self::get_global)
-            .name("get global")
+            .name(js_string!("get global"))
             .build();
         let get_ignore_case = BuiltInBuilder::callable(realm, Self::get_ignore_case)
-            .name("get ignoreCase")
+            .name(js_string!("get ignoreCase"))
             .build();
         let get_multiline = BuiltInBuilder::callable(realm, Self::get_multiline)
-            .name("get multiline")
+            .name(js_string!("get multiline"))
             .build();
         let get_dot_all = BuiltInBuilder::callable(realm, Self::get_dot_all)
-            .name("get dotAll")
+            .name(js_string!("get dotAll"))
             .build();
         let get_unicode = BuiltInBuilder::callable(realm, Self::get_unicode)
-            .name("get unicode")
+            .name(js_string!("get unicode"))
             .build();
         let get_sticky = BuiltInBuilder::callable(realm, Self::get_sticky)
-            .name("get sticky")
+            .name(js_string!("get sticky"))
             .build();
         let get_flags = BuiltInBuilder::callable(realm, Self::get_flags)
-            .name("get flags")
+            .name(js_string!("get flags"))
             .build();
         let get_source = BuiltInBuilder::callable(realm, Self::get_source)
-            .name("get source")
+            .name(js_string!("get source"))
             .build();
         let regexp = BuiltInBuilder::from_standard_constructor::<Self>(realm)
             .static_accessor(
@@ -91,46 +91,87 @@ impl IntrinsicObject for RegExp {
                 None,
                 Attribute::CONFIGURABLE,
             )
-            .property(utf16!("lastIndex"), 0, Attribute::all())
-            .method(Self::test, "test", 1)
-            .method(Self::exec, "exec", 1)
-            .method(Self::to_string, "toString", 0)
-            .method(Self::r#match, (JsSymbol::r#match(), "[Symbol.match]"), 1)
+            .property(js_string!("lastIndex"), 0, Attribute::all())
+            .method(Self::test, js_string!("test"), 1)
+            .method(Self::exec, js_string!("exec"), 1)
+            .method(Self::to_string, js_string!("toString"), 0)
+            .method(
+                Self::r#match,
+                (JsSymbol::r#match(), js_string!("[Symbol.match]")),
+                1,
+            )
             .method(
                 Self::match_all,
-                (JsSymbol::match_all(), "[Symbol.matchAll]"),
+                (JsSymbol::match_all(), js_string!("[Symbol.matchAll]")),
+                1,
+            )
+            .method(
+                Self::replace,
+                (JsSymbol::replace(), js_string!("[Symbol.replace]")),
+                2,
+            )
+            .method(
+                Self::search,
+                (JsSymbol::search(), js_string!("[Symbol.search]")),
                 1,
             )
-            .method(Self::replace, (JsSymbol::replace(), "[Symbol.replace]"), 2)
-            .method(Self::search, (JsSymbol::search(), "[Symbol.search]"), 1)
-            .method(Self::split, (JsSymbol::split(), "[Symbol.split]"), 2)
+            .method(
+                Self::split,
+                (JsSymbol::split(), js_string!("[Symbol.split]")),
+                2,
+            )
             .accessor(
-                utf16!("hasIndices"),
+                js_string!("hasIndices"),
                 Some(get_has_indices),
                 None,
                 flag_attributes,
             )
-            .accessor(utf16!("global"), Some(get_global), None, flag_attributes)
             .accessor(
-                utf16!("ignoreCase"),
+                js_string!("global"),
+                Some(get_global),
+                None,
+                flag_attributes,
+            )
+            .accessor(
+                js_string!("ignoreCase"),
                 Some(get_ignore_case),
                 None,
                 flag_attributes,
             )
             .accessor(
-                utf16!("multiline"),
+                js_string!("multiline"),
                 Some(get_multiline),
                 None,
                 flag_attributes,
             )
-            .accessor(utf16!("dotAll"), Some(get_dot_all), None, flag_attributes)
-            .accessor(utf16!("unicode"), Some(get_unicode), None, flag_attributes)
-            .accessor(utf16!("sticky"), Some(get_sticky), None, flag_attributes)
-            .accessor(utf16!("flags"), Some(get_flags), None, flag_attributes)
-            .accessor(utf16!("source"), Some(get_source), None, flag_attributes);
+            .accessor(
+                js_string!("dotAll"),
+                Some(get_dot_all),
+                None,
+                flag_attributes,
+            )
+            .accessor(
+                js_string!("unicode"),
+                Some(get_unicode),
+                None,
+                flag_attributes,
+            )
+            .accessor(
+                js_string!("sticky"),
+                Some(get_sticky),
+                None,
+                flag_attributes,
+            )
+            .accessor(js_string!("flags"), Some(get_flags), None, flag_attributes)
+            .accessor(
+                js_string!("source"),
+                Some(get_source),
+                None,
+                flag_attributes,
+            );
 
         #[cfg(feature = "annex-b")]
-        let regexp = regexp.method(Self::compile, "compile", 2);
+        let regexp = regexp.method(Self::compile, js_string!("compile"), 2);
 
         regexp.build();
     }
@@ -141,7 +182,7 @@ impl IntrinsicObject for RegExp {
 }
 
 impl BuiltInObject for RegExp {
-    const NAME: &'static str = "RegExp";
+    const NAME: JsString = StaticJsStrings::REG_EXP;
 }
 
 impl BuiltInConstructor for RegExp {
@@ -210,12 +251,12 @@ impl BuiltInConstructor for RegExp {
             (p, f)
         } else if let Some(pattern) = pattern_is_regexp {
             // a. Let P be ? Get(pattern, "source").
-            let p = pattern.get("source", context)?;
+            let p = pattern.get(js_string!("source"), context)?;
 
             // b. If flags is undefined, then
             let f = if flags.is_undefined() {
                 // i. Let F be ? Get(pattern, "flags").
-                pattern.get("flags", context)?
+                pattern.get(js_string!("flags"), context)?
             // c. Else,
             } else {
                 // i. Let F be flags.
@@ -641,7 +682,7 @@ impl RegExp {
             }
 
             // 18. Return result.
-            return Ok(result.into());
+            return Ok(js_string!(result).into());
         }
 
         Err(JsNativeError::typ()
@@ -684,7 +725,7 @@ impl RegExp {
                     this,
                     &JsValue::new(context.intrinsics().constructors().regexp().prototype()),
                 ) {
-                    Ok(JsValue::new("(?:)"))
+                    Ok(JsValue::new(js_string!("(?:)")))
                 } else {
                     Err(JsNativeError::typ()
                         .with_message("RegExp.prototype.source method called on incompatible value")
@@ -1064,12 +1105,13 @@ impl RegExp {
             // ii. Perform ! CreateDataPropertyOrThrow(groups, s, capturedValue).
             // iii. Append s to groupNames.
             for (name, range) in named_groups {
+                let name = js_string!(name);
                 if let Some(range) = range {
                     // TODO: Full UTF-16 regex support
                     let value = js_string!(&lossy_input[range.clone()]);
 
                     groups
-                        .create_data_property_or_throw(name, value, context)
+                        .create_data_property_or_throw(name.clone(), value, context)
                         .expect("this CreateDataPropertyOrThrow call must not fail");
 
                     // 22.2.7.8 MakeMatchIndicesIndexPairArray ( S, indices, groupNames, hasGroups )
@@ -1079,7 +1121,7 @@ impl RegExp {
                     // d. Perform ! CreateDataPropertyOrThrow(A, ! ToString(𝔽(i)), matchIndexPair).
                     group_names
                         .create_data_property_or_throw(
-                            name,
+                            name.clone(),
                             Array::create_array_from_list(
                                 [range.start.into(), range.end.into()],
                                 context,
@@ -1089,7 +1131,7 @@ impl RegExp {
                         .expect("this CreateDataPropertyOrThrow call must not fail");
                 } else {
                     groups
-                        .create_data_property_or_throw(name, JsValue::undefined(), context)
+                        .create_data_property_or_throw(name.clone(), JsValue::undefined(), context)
                         .expect("this CreateDataPropertyOrThrow call must not fail");
 
                     // 22.2.7.8 MakeMatchIndicesIndexPairArray ( S, indices, groupNames, hasGroups )

boa_engine/src/builtins/regexp/regexp_string_iterator.rs

@@ -14,6 +14,7 @@ use crate::{
     builtins::{iterable::create_iter_result_object, regexp, BuiltInBuilder, IntrinsicObject},
     context::intrinsics::Intrinsics,
     error::JsNativeError,
+    js_string,
     object::{JsObject, ObjectData},
     property::Attribute,
     realm::Realm,
@@ -42,7 +43,7 @@ pub struct RegExpStringIterator {
 
 impl IntrinsicObject for RegExpStringIterator {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event("RegExpStringIterator", "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         BuiltInBuilder::with_intrinsic::<Self>(realm)
             .prototype(
@@ -52,10 +53,10 @@ impl IntrinsicObject for RegExpStringIterator {
                     .iterator_prototypes()
                     .iterator(),
             )
-            .static_method(Self::next, "next", 0)
+            .static_method(Self::next, js_string!("next"), 0)
             .static_property(
                 JsSymbol::to_string_tag(),
-                "RegExp String Iterator",
+                js_string!("RegExp String Iterator"),
                 Attribute::CONFIGURABLE,
             )
             .build();

boa_engine/src/builtins/regexp/tests.rs

@@ -1,4 +1,6 @@
-use crate::{object::JsObject, run_test_actions, JsNativeErrorKind, JsValue, TestAction};
+use crate::{
+    js_string, object::JsObject, run_test_actions, JsNativeErrorKind, JsValue, TestAction,
+};
 use indoc::indoc;
 
 #[test]
@@ -33,7 +35,7 @@ fn species() {
         // return-value
         TestAction::assert("Object.is(accessor.call(thisVal), thisVal)"),
         // symbol-species-name
-        TestAction::assert_eq("name.value", "get [Symbol.species]"),
+        TestAction::assert_eq("name.value", js_string!("get [Symbol.species]")),
         TestAction::assert("!name.enumerable"),
         TestAction::assert("!name.writable"),
         TestAction::assert("name.configurable"),
@@ -61,7 +63,7 @@ fn flags() {
         TestAction::assert("!re_gi.dotAll"),
         TestAction::assert("!re_gi.unicode"),
         TestAction::assert("!re_gi.sticky"),
-        TestAction::assert_eq("re_gi.flags", "gi"),
+        TestAction::assert_eq("re_gi.flags", js_string!("gi")),
         //
         TestAction::assert("!re_sm.global"),
         TestAction::assert("!re_sm.ignoreCase"),
@@ -69,7 +71,7 @@ fn flags() {
         TestAction::assert("re_sm.dotAll"),
         TestAction::assert("!re_sm.unicode"),
         TestAction::assert("!re_sm.sticky"),
-        TestAction::assert_eq("re_sm.flags", "ms"),
+        TestAction::assert_eq("re_sm.flags", js_string!("ms")),
         //
         TestAction::assert("!re_u.global"),
         TestAction::assert("!re_u.ignoreCase"),
@@ -77,7 +79,7 @@ fn flags() {
         TestAction::assert("!re_u.dotAll"),
         TestAction::assert("re_u.unicode"),
         TestAction::assert("!re_u.sticky"),
-        TestAction::assert_eq("re_u.flags", "u"),
+        TestAction::assert_eq("re_u.flags", js_string!("u")),
     ]);
 }
 
@@ -110,7 +112,7 @@ fn exec() {
         TestAction::assert_eq("result.index", 4),
         TestAction::assert_eq(
             "result.input",
-            "The Quick Brown Fox Jumps Over The Lazy Dog",
+            js_string!("The Quick Brown Fox Jumps Over The Lazy Dog"),
         ),
     ]);
 }
@@ -134,11 +136,11 @@ fn no_panic_on_parse_fail() {
 #[test]
 fn to_string() {
     run_test_actions([
-        TestAction::assert_eq("(new RegExp('a+b+c')).toString()", "/a+b+c/"),
-        TestAction::assert_eq("(new RegExp('bar', 'g')).toString()", "/bar/g"),
-        TestAction::assert_eq(r"(new RegExp('\\n', 'g')).toString()", r"/\n/g"),
-        TestAction::assert_eq(r"/\n/g.toString()", r"/\n/g"),
-        TestAction::assert_eq(r"/,\;/.toString()", r"/,\;/"),
+        TestAction::assert_eq("(new RegExp('a+b+c')).toString()", js_string!("/a+b+c/")),
+        TestAction::assert_eq("(new RegExp('bar', 'g')).toString()", js_string!("/bar/g")),
+        TestAction::assert_eq(r"(new RegExp('\\n', 'g')).toString()", js_string!(r"/\n/g")),
+        TestAction::assert_eq(r"/\n/g.toString()", js_string!(r"/\n/g")),
+        TestAction::assert_eq(r"/,\;/.toString()", js_string!(r"/,\;/")),
     ]);
 }
 #[test]
@@ -160,7 +162,7 @@ fn search() {
         TestAction::assert("!length.writable"),
         TestAction::assert("length.configurable"),
         // name
-        TestAction::assert_eq("name.value", "[Symbol.search]"),
+        TestAction::assert_eq("name.value", js_string!("[Symbol.search]")),
         TestAction::assert("!name.enumerable"),
         TestAction::assert("!name.writable"),
         TestAction::assert("name.configurable"),

boa_engine/src/builtins/set/mod.rs

@@ -22,12 +22,13 @@ use crate::{
     builtins::{BuiltInBuilder, BuiltInConstructor, BuiltInObject, IntrinsicObject},
     context::intrinsics::{Intrinsics, StandardConstructor, StandardConstructors},
     error::JsNativeError,
+    js_string,
     object::{internal_methods::get_prototype_from_constructor, JsObject, ObjectData},
     property::{Attribute, PropertyNameKind},
     realm::Realm,
-    string::utf16,
+    string::{common::StaticJsStrings, utf16},
     symbol::JsSymbol,
-    Context, JsArgs, JsResult, JsValue,
+    Context, JsArgs, JsResult, JsString, JsValue,
 };
 use boa_profiler::Profiler;
 use num_traits::Zero;
@@ -42,18 +43,18 @@ impl IntrinsicObject for Set {
         Self::STANDARD_CONSTRUCTOR(intrinsics.constructors()).constructor()
     }
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         let get_species = BuiltInBuilder::callable(realm, Self::get_species)
-            .name("get [Symbol.species]")
+            .name(js_string!("get [Symbol.species]"))
             .build();
 
         let size_getter = BuiltInBuilder::callable(realm, Self::size_getter)
-            .name("get size")
+            .name(js_string!("get size"))
             .build();
 
         let values_function = BuiltInBuilder::callable(realm, Self::values)
-            .name("values")
+            .name(js_string!("values"))
             .build();
 
         BuiltInBuilder::from_standard_constructor::<Self>(realm)
@@ -63,12 +64,12 @@ impl IntrinsicObject for Set {
                 None,
                 Attribute::CONFIGURABLE,
             )
-            .method(Self::add, "add", 1)
-            .method(Self::clear, "clear", 0)
-            .method(Self::delete, "delete", 1)
-            .method(Self::entries, "entries", 0)
-            .method(Self::for_each, "forEach", 1)
-            .method(Self::has, "has", 1)
+            .method(Self::add, js_string!("add"), 1)
+            .method(Self::clear, js_string!("clear"), 0)
+            .method(Self::delete, js_string!("delete"), 1)
+            .method(Self::entries, js_string!("entries"), 0)
+            .method(Self::for_each, js_string!("forEach"), 1)
+            .method(Self::has, js_string!("has"), 1)
             .property(
                 utf16!("keys"),
                 values_function.clone(),
@@ -100,7 +101,7 @@ impl IntrinsicObject for Set {
 }
 
 impl BuiltInObject for Set {
-    const NAME: &'static str = "Set";
+    const NAME: JsString = StaticJsStrings::SET;
 }
 
 impl BuiltInConstructor for Set {

boa_engine/src/builtins/set/set_iterator.rs

@@ -12,6 +12,7 @@ use crate::{
     },
     context::intrinsics::Intrinsics,
     error::JsNativeError,
+    js_string,
     object::{JsObject, ObjectData},
     property::{Attribute, PropertyNameKind},
     realm::Realm,
@@ -38,7 +39,7 @@ pub struct SetIterator {
 
 impl IntrinsicObject for SetIterator {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event("SetIterator", "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         BuiltInBuilder::with_intrinsic::<Self>(realm)
             .prototype(
@@ -48,10 +49,10 @@ impl IntrinsicObject for SetIterator {
                     .iterator_prototypes()
                     .iterator(),
             )
-            .static_method(Self::next, "next", 0)
+            .static_method(Self::next, js_string!("next"), 0)
             .static_property(
                 JsSymbol::to_string_tag(),
-                "Set Iterator",
+                js_string!("Set Iterator"),
                 Attribute::CONFIGURABLE,
             )
             .build();

boa_engine/src/builtins/string/mod.rs

@@ -17,7 +17,7 @@ use crate::{
     object::{internal_methods::get_prototype_from_constructor, JsObject, ObjectData},
     property::{Attribute, PropertyDescriptor},
     realm::Realm,
-    string::utf16,
+    string::{common::StaticJsStrings, utf16},
     string::{CodePoint, Utf16Trim},
     symbol::JsSymbol,
     value::IntegerOrInfinity,
@@ -76,18 +76,18 @@ pub(crate) struct String;
 
 impl IntrinsicObject for String {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         let symbol_iterator = JsSymbol::iterator();
 
         let trim_start = BuiltInBuilder::callable(realm, Self::trim_start)
             .length(0)
-            .name("trimStart")
+            .name(js_string!("trimStart"))
             .build();
 
         let trim_end = BuiltInBuilder::callable(realm, Self::trim_end)
             .length(0)
-            .name("trimEnd")
+            .name(js_string!("trimEnd"))
             .build();
 
         #[cfg(feature = "annex-b")]
@@ -98,81 +98,93 @@ impl IntrinsicObject for String {
 
         let attribute = Attribute::READONLY | Attribute::NON_ENUMERABLE | Attribute::PERMANENT;
         let builder = BuiltInBuilder::from_standard_constructor::<Self>(realm)
-            .property(utf16!("length"), 0, attribute)
+            .property(js_string!("length"), 0, attribute)
             .property(
-                utf16!("trimStart"),
+                js_string!("trimStart"),
                 trim_start,
                 Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE,
             )
             .property(
-                utf16!("trimEnd"),
+                js_string!("trimEnd"),
                 trim_end,
                 Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE,
             )
-            .static_method(Self::raw, "raw", 1)
-            .static_method(Self::from_char_code, "fromCharCode", 1)
-            .static_method(Self::from_code_point, "fromCodePoint", 1)
-            .method(Self::char_at, "charAt", 1)
-            .method(Self::char_code_at, "charCodeAt", 1)
-            .method(Self::code_point_at, "codePointAt", 1)
-            .method(Self::to_string, "toString", 0)
-            .method(Self::concat, "concat", 1)
-            .method(Self::repeat, "repeat", 1)
-            .method(Self::slice, "slice", 2)
-            .method(Self::starts_with, "startsWith", 1)
-            .method(Self::ends_with, "endsWith", 1)
-            .method(Self::includes, "includes", 1)
-            .method(Self::index_of, "indexOf", 1)
-            .method(Self::is_well_formed, "isWellFormed", 0)
-            .method(Self::last_index_of, "lastIndexOf", 1)
-            .method(Self::locale_compare, "localeCompare", 1)
-            .method(Self::r#match, "match", 1)
-            .method(Self::normalize, "normalize", 0)
-            .method(Self::pad_end, "padEnd", 1)
-            .method(Self::pad_start, "padStart", 1)
-            .method(Self::trim, "trim", 0)
-            .method(Self::to_case::<false>, "toLowerCase", 0)
-            .method(Self::to_case::<true>, "toUpperCase", 0)
-            .method(Self::to_well_formed, "toWellFormed", 0)
-            .method(Self::to_locale_case::<false>, "toLocaleLowerCase", 0)
-            .method(Self::to_locale_case::<true>, "toLocaleUpperCase", 0)
-            .method(Self::substring, "substring", 2)
-            .method(Self::split, "split", 2)
-            .method(Self::value_of, "valueOf", 0)
-            .method(Self::match_all, "matchAll", 1)
-            .method(Self::replace, "replace", 2)
-            .method(Self::replace_all, "replaceAll", 2)
-            .method(Self::iterator, (symbol_iterator, "[Symbol.iterator]"), 0)
-            .method(Self::search, "search", 1)
-            .method(Self::at, "at", 1);
+            .static_method(Self::raw, js_string!("raw"), 1)
+            .static_method(Self::from_char_code, js_string!("fromCharCode"), 1)
+            .static_method(Self::from_code_point, js_string!("fromCodePoint"), 1)
+            .method(Self::char_at, js_string!("charAt"), 1)
+            .method(Self::char_code_at, js_string!("charCodeAt"), 1)
+            .method(Self::code_point_at, js_string!("codePointAt"), 1)
+            .method(Self::to_string, js_string!("toString"), 0)
+            .method(Self::concat, js_string!("concat"), 1)
+            .method(Self::repeat, js_string!("repeat"), 1)
+            .method(Self::slice, js_string!("slice"), 2)
+            .method(Self::starts_with, js_string!("startsWith"), 1)
+            .method(Self::ends_with, js_string!("endsWith"), 1)
+            .method(Self::includes, js_string!("includes"), 1)
+            .method(Self::index_of, js_string!("indexOf"), 1)
+            .method(Self::is_well_formed, js_string!("isWellFormed"), 0)
+            .method(Self::last_index_of, js_string!("lastIndexOf"), 1)
+            .method(Self::locale_compare, js_string!("localeCompare"), 1)
+            .method(Self::r#match, js_string!("match"), 1)
+            .method(Self::normalize, js_string!("normalize"), 0)
+            .method(Self::pad_end, js_string!("padEnd"), 1)
+            .method(Self::pad_start, js_string!("padStart"), 1)
+            .method(Self::trim, js_string!("trim"), 0)
+            .method(Self::to_case::<false>, js_string!("toLowerCase"), 0)
+            .method(Self::to_case::<true>, js_string!("toUpperCase"), 0)
+            .method(Self::to_well_formed, js_string!("toWellFormed"), 0)
+            .method(
+                Self::to_locale_case::<false>,
+                js_string!("toLocaleLowerCase"),
+                0,
+            )
+            .method(
+                Self::to_locale_case::<true>,
+                js_string!("toLocaleUpperCase"),
+                0,
+            )
+            .method(Self::substring, js_string!("substring"), 2)
+            .method(Self::split, js_string!("split"), 2)
+            .method(Self::value_of, js_string!("valueOf"), 0)
+            .method(Self::match_all, js_string!("matchAll"), 1)
+            .method(Self::replace, js_string!("replace"), 2)
+            .method(Self::replace_all, js_string!("replaceAll"), 2)
+            .method(
+                Self::iterator,
+                (symbol_iterator, js_string!("[Symbol.iterator]")),
+                0,
+            )
+            .method(Self::search, js_string!("search"), 1)
+            .method(Self::at, js_string!("at"), 1);
 
         #[cfg(feature = "annex-b")]
         let builder = {
             builder
                 .property(
-                    utf16!("trimLeft"),
+                    js_string!("trimLeft"),
                     trim_left,
                     Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE,
                 )
                 .property(
-                    utf16!("trimRight"),
+                    js_string!("trimRight"),
                     trim_right,
                     Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE,
                 )
-                .method(Self::substr, "substr", 2)
-                .method(Self::anchor, "anchor", 1)
-                .method(Self::big, "big", 0)
-                .method(Self::blink, "blink", 0)
-                .method(Self::bold, "bold", 0)
-                .method(Self::fixed, "fixed", 0)
-                .method(Self::fontcolor, "fontcolor", 1)
-                .method(Self::fontsize, "fontsize", 1)
-                .method(Self::italics, "italics", 0)
-                .method(Self::link, "link", 1)
-                .method(Self::small, "small", 0)
-                .method(Self::strike, "strike", 0)
-                .method(Self::sub, "sub", 0)
-                .method(Self::sup, "sup", 0)
+                .method(Self::substr, js_string!("substr"), 2)
+                .method(Self::anchor, js_string!("anchor"), 1)
+                .method(Self::big, js_string!("big"), 0)
+                .method(Self::blink, js_string!("blink"), 0)
+                .method(Self::bold, js_string!("bold"), 0)
+                .method(Self::fixed, js_string!("fixed"), 0)
+                .method(Self::fontcolor, js_string!("fontcolor"), 1)
+                .method(Self::fontsize, js_string!("fontsize"), 1)
+                .method(Self::italics, js_string!("italics"), 0)
+                .method(Self::link, js_string!("link"), 1)
+                .method(Self::small, js_string!("small"), 0)
+                .method(Self::strike, js_string!("strike"), 0)
+                .method(Self::sub, js_string!("sub"), 0)
+                .method(Self::sup, js_string!("sup"), 0)
         };
 
         builder.build();
@@ -184,7 +196,7 @@ impl IntrinsicObject for String {
 }
 
 impl BuiltInObject for String {
-    const NAME: &'static str = "String";
+    const NAME: JsString = StaticJsStrings::STRING;
 }
 
 impl BuiltInConstructor for String {
@@ -1835,7 +1847,7 @@ impl String {
             .collect::<std::string::String>();
 
         // 7. Return result.
-        Ok(result.into())
+        Ok(js_string!(result).into())
     }
 
     /// `String.prototype.substring( indexStart[, indexEnd] )`

boa_engine/src/builtins/string/string_iterator.rs

@@ -33,7 +33,7 @@ pub struct StringIterator {
 
 impl IntrinsicObject for StringIterator {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event("StringIterator", "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         BuiltInBuilder::with_intrinsic::<Self>(realm)
             .prototype(
@@ -43,10 +43,10 @@ impl IntrinsicObject for StringIterator {
                     .iterator_prototypes()
                     .iterator(),
             )
-            .static_method(Self::next, "next", 0)
+            .static_method(Self::next, js_string!("next"), 0)
             .static_property(
                 JsSymbol::to_string_tag(),
-                "String Iterator",
+                js_string!("String Iterator"),
                 Attribute::CONFIGURABLE,
             )
             .build();

boa_engine/src/builtins/string/tests.rs

@@ -56,9 +56,12 @@ fn concat() {
             "#}),
         TestAction::assert_eq(
             "hello.concat(world, nice)",
-            "Hello, world! Have a nice day.",
+            js_string!("Hello, world! Have a nice day."),
+        ),
+        TestAction::assert_eq(
+            "hello + world + nice",
+            js_string!("Hello, world! Have a nice day."),
         ),
-        TestAction::assert_eq("hello + world + nice", "Hello, world! Have a nice day."),
     ]);
 }
 
@@ -69,7 +72,10 @@ fn generic_concat() {
                 Number.prototype.concat = String.prototype.concat;
                 let number = new Number(100);
             "#}),
-        TestAction::assert_eq("number.concat(' - 50', ' = 50')", "100 - 50 = 50"),
+        TestAction::assert_eq(
+            "number.concat(' - 50', ' = 50')",
+            js_string!("100 - 50 = 50"),
+        ),
     ]);
 }
 
@@ -90,12 +96,12 @@ fn repeat() {
             var en = new String('english');
             var zh = new String('中文');
         "#}),
-        TestAction::assert_eq("empty.repeat(0)", ""),
-        TestAction::assert_eq("empty.repeat(1)", ""),
-        TestAction::assert_eq("en.repeat(0)", ""),
-        TestAction::assert_eq("zh.repeat(0)", ""),
-        TestAction::assert_eq("en.repeat(1)", "english"),
-        TestAction::assert_eq("zh.repeat(2)", "中文中文"),
+        TestAction::assert_eq("empty.repeat(0)", js_string!()),
+        TestAction::assert_eq("empty.repeat(1)", js_string!()),
+        TestAction::assert_eq("en.repeat(0)", js_string!()),
+        TestAction::assert_eq("zh.repeat(0)", js_string!()),
+        TestAction::assert_eq("en.repeat(1)", js_string!("english")),
+        TestAction::assert_eq("zh.repeat(2)", js_string!("中文中文")),
     ]);
 }
 
@@ -133,10 +139,10 @@ fn repeat_throws_when_count_overflows_max_length() {
 fn repeat_generic() {
     run_test_actions([
         TestAction::run("Number.prototype.repeat = String.prototype.repeat;"),
-        TestAction::assert_eq("(0).repeat(0)", ""),
-        TestAction::assert_eq("(1).repeat(1)", "1"),
-        TestAction::assert_eq("(1).repeat(5)", "11111"),
-        TestAction::assert_eq("(12).repeat(3)", "121212"),
+        TestAction::assert_eq("(0).repeat(0)", js_string!()),
+        TestAction::assert_eq("(1).repeat(1)", js_string!("1")),
+        TestAction::assert_eq("(1).repeat(5)", js_string!("11111")),
+        TestAction::assert_eq("(12).repeat(3)", js_string!("121212")),
     ]);
 }
 
@@ -146,7 +152,7 @@ fn replace() {
         indoc! {r#"
             "abc".replace("a", "2")
         "#},
-        "2bc",
+        js_string!("2bc"),
     )]);
 }
 
@@ -156,7 +162,7 @@ fn replace_no_match() {
         indoc! {r#"
             "abc".replace(/d/, "$&$&")
         "#},
-        "abc",
+        js_string!("abc"),
     )]);
 }
 
@@ -166,7 +172,7 @@ fn replace_with_capture_groups() {
         indoc! {r#"
             "John Smith".replace(/(\w+)\s(\w+)/, '$2, $1')
         "#},
-        "Smith, John",
+        js_string!("Smith, John"),
     )]);
 }
 
@@ -177,7 +183,7 @@ fn replace_with_tenth_capture_group() {
             var re = /(\d)(\d)(\d)(\d)(\d)(\d)(\d)(\d)(\d)(\d)/;
             "0123456789".replace(re, '$10')
         "#},
-        "9",
+        js_string!("9"),
     )]);
 }
 
@@ -193,11 +199,11 @@ fn replace_substitutions() {
             var end = a.replace(re, " $' ");
             var no_sub = a.replace(re, " $_ ");
         "#}),
-        TestAction::assert_eq("a.replace(re, \" $$ \")", "one $ three"),
-        TestAction::assert_eq("a.replace(re, \"$&$&\")", "one two  two three"),
-        TestAction::assert_eq("a.replace(re, \" $` \")", "one one three"),
-        TestAction::assert_eq("a.replace(re, \" $' \")", "one three three"),
-        TestAction::assert_eq("a.replace(re, \" $_ \")", "one $_ three"),
+        TestAction::assert_eq("a.replace(re, \" $$ \")", js_string!("one $ three")),
+        TestAction::assert_eq("a.replace(re, \"$&$&\")", js_string!("one two  two three")),
+        TestAction::assert_eq("a.replace(re, \" $` \")", js_string!("one one three")),
+        TestAction::assert_eq("a.replace(re, \" $' \")", js_string!("one three three")),
+        TestAction::assert_eq("a.replace(re, \" $_ \")", js_string!("one $_ three")),
     ]);
 }
 
@@ -216,11 +222,11 @@ fn replace_with_function() {
             "#}),
         TestAction::assert_eq(
             "\"ecmascript is cool\".replace(/c(o)(o)(l)/, replacer)",
-            "ecmascript is awesome!",
+            js_string!("ecmascript is awesome!"),
         ),
-        TestAction::assert_eq("p1", "o"),
-        TestAction::assert_eq("p2", "o"),
-        TestAction::assert_eq("p3", "l"),
+        TestAction::assert_eq("p1", js_string!("o")),
+        TestAction::assert_eq("p2", js_string!("o")),
+        TestAction::assert_eq("p3", js_string!("l")),
         TestAction::assert_eq("length", 14),
     ]);
 }
@@ -323,7 +329,7 @@ fn match_all_one() {
             )
         "#}),
         TestAction::assert_eq("m1.value.index", 0),
-        TestAction::assert_eq("m1.value.input", "test1test2"),
+        TestAction::assert_eq("m1.value.input", js_string!("test1test2")),
         TestAction::assert_eq("m1.value.groups", JsValue::undefined()),
         TestAction::assert(indoc! {r#"
             arrayEquals(
@@ -332,7 +338,7 @@ fn match_all_one() {
             )
         "#}),
         TestAction::assert_eq("m2.value.index", 5),
-        TestAction::assert_eq("m2.value.input", "test1test2"),
+        TestAction::assert_eq("m2.value.input", js_string!("test1test2")),
         TestAction::assert_eq("m2.value.groups", JsValue::undefined()),
         TestAction::assert_eq("m3.value", JsValue::undefined()),
     ]);
@@ -360,7 +366,7 @@ fn match_all_two() {
             )
         "#}),
         TestAction::assert_eq("m1.value.index", 6),
-        TestAction::assert_eq("m1.value.input", "table football, foosball"),
+        TestAction::assert_eq("m1.value.input", js_string!("table football, foosball")),
         TestAction::assert_eq("m1.value.groups", JsValue::undefined()),
         TestAction::assert(indoc! {r#"
             arrayEquals(
@@ -369,7 +375,7 @@ fn match_all_two() {
             )
         "#}),
         TestAction::assert_eq("m2.value.index", 16),
-        TestAction::assert_eq("m2.value.input", "table football, foosball"),
+        TestAction::assert_eq("m2.value.input", js_string!("table football, foosball")),
         TestAction::assert_eq("m2.value.groups", JsValue::undefined()),
         TestAction::assert_eq("m3.value", JsValue::undefined()),
     ]);
@@ -395,7 +401,7 @@ fn test_match() {
         TestAction::assert_eq("result1.index", 4),
         TestAction::assert_eq(
             "result1.input",
-            "The Quick Brown Fox Jumps Over The Lazy Dog",
+            js_string!("The Quick Brown Fox Jumps Over The Lazy Dog"),
         ),
         TestAction::assert(indoc! {r#"
                 arrayEquals(
@@ -412,7 +418,7 @@ fn test_match() {
         TestAction::assert_eq("result3.index", 0),
         TestAction::assert_eq(
             "result3.input",
-            "The Quick Brown Fox Jumps Over The Lazy Dog",
+            js_string!("The Quick Brown Fox Jumps Over The Lazy Dog"),
         ),
         TestAction::assert(indoc! {r#"
                 arrayEquals(
@@ -426,30 +432,30 @@ fn test_match() {
 #[test]
 fn trim() {
     run_test_actions([
-        TestAction::assert_eq(r"'Hello'.trim()", "Hello"),
-        TestAction::assert_eq(r"' \nHello'.trim()", "Hello"),
-        TestAction::assert_eq(r"'Hello \n\r'.trim()", "Hello"),
-        TestAction::assert_eq(r"' Hello '.trim()", "Hello"),
+        TestAction::assert_eq(r"'Hello'.trim()", js_string!("Hello")),
+        TestAction::assert_eq(r"' \nHello'.trim()", js_string!("Hello")),
+        TestAction::assert_eq(r"'Hello \n\r'.trim()", js_string!("Hello")),
+        TestAction::assert_eq(r"' Hello '.trim()", js_string!("Hello")),
     ]);
 }
 
 #[test]
 fn trim_start() {
     run_test_actions([
-        TestAction::assert_eq(r"'Hello'.trimStart()", "Hello"),
-        TestAction::assert_eq(r"' \nHello'.trimStart()", "Hello"),
-        TestAction::assert_eq(r"'Hello \n\r'.trimStart()", "Hello \n\r"),
-        TestAction::assert_eq(r"' Hello '.trimStart()", "Hello "),
+        TestAction::assert_eq(r"'Hello'.trimStart()", js_string!("Hello")),
+        TestAction::assert_eq(r"' \nHello'.trimStart()", js_string!("Hello")),
+        TestAction::assert_eq(r"'Hello \n\r'.trimStart()", js_string!("Hello \n\r")),
+        TestAction::assert_eq(r"' Hello '.trimStart()", js_string!("Hello ")),
     ]);
 }
 
 #[test]
 fn trim_end() {
     run_test_actions([
-        TestAction::assert_eq(r"'Hello'.trimEnd()", "Hello"),
-        TestAction::assert_eq(r"' \nHello'.trimEnd()", " \nHello"),
-        TestAction::assert_eq(r"'Hello \n\r'.trimEnd()", "Hello"),
-        TestAction::assert_eq(r"' Hello '.trimEnd()", " Hello"),
+        TestAction::assert_eq(r"'Hello'.trimEnd()", js_string!("Hello")),
+        TestAction::assert_eq(r"' \nHello'.trimEnd()", js_string!(" \nHello")),
+        TestAction::assert_eq(r"'Hello \n\r'.trimEnd()", js_string!("Hello")),
+        TestAction::assert_eq(r"' Hello '.trimEnd()", js_string!(" Hello")),
     ]);
 }
 
@@ -572,7 +578,7 @@ fn split_with_symbol_split_method() {
                 sep_a[Symbol.split] = function(s, limit) { return s + limit.toString(); };
                 'hello'.split(sep_a, 10)
             "#},
-            "hello10",
+            js_string!("hello10"),
         ),
         TestAction::assert(indoc! {r#"
                 let sep_b = {};
@@ -745,11 +751,11 @@ fn last_index_non_integer_position_argument() {
 #[test]
 fn char_at() {
     run_test_actions([
-        TestAction::assert_eq("'abc'.charAt(-1)", ""),
-        TestAction::assert_eq("'abc'.charAt(1)", "b"),
-        TestAction::assert_eq("'abc'.charAt(9)", ""),
-        TestAction::assert_eq("'abc'.charAt()", "a"),
-        TestAction::assert_eq("'abc'.charAt(null)", "a"),
+        TestAction::assert_eq("'abc'.charAt(-1)", js_string!()),
+        TestAction::assert_eq("'abc'.charAt(1)", js_string!("b")),
+        TestAction::assert_eq("'abc'.charAt(9)", js_string!()),
+        TestAction::assert_eq("'abc'.charAt()", js_string!("a")),
+        TestAction::assert_eq("'abc'.charAt(null)", js_string!("a")),
         TestAction::assert_eq(r"'\uDBFF'.charAt(0)", js_string!(&[0xDBFFu16])),
     ]);
 }
@@ -788,11 +794,11 @@ fn code_point_at() {
 #[test]
 fn slice() {
     run_test_actions([
-        TestAction::assert_eq("'abc'.slice()", "abc"),
-        TestAction::assert_eq("'abc'.slice(1)", "bc"),
-        TestAction::assert_eq("'abc'.slice(-1)", "c"),
-        TestAction::assert_eq("'abc'.slice(0, 9)", "abc"),
-        TestAction::assert_eq("'abc'.slice(9, 10)", ""),
+        TestAction::assert_eq("'abc'.slice()", js_string!("abc")),
+        TestAction::assert_eq("'abc'.slice(1)", js_string!("bc")),
+        TestAction::assert_eq("'abc'.slice(-1)", js_string!("c")),
+        TestAction::assert_eq("'abc'.slice(0, 9)", js_string!("abc")),
+        TestAction::assert_eq("'abc'.slice(9, 10)", js_string!()),
     ]);
 }
 
@@ -838,8 +844,8 @@ fn unicode_iter() {
 fn string_get_property() {
     run_test_actions([
         TestAction::assert_eq("'abc'[-1]", JsValue::undefined()),
-        TestAction::assert_eq("'abc'[1]", "b"),
-        TestAction::assert_eq("'abc'[2]", "c"),
+        TestAction::assert_eq("'abc'[1]", js_string!("b")),
+        TestAction::assert_eq("'abc'[2]", js_string!("c")),
         TestAction::assert_eq("'abc'[3]", JsValue::undefined()),
         TestAction::assert_eq("'abc'['foo']", JsValue::undefined()),
         TestAction::assert_eq("'😀'[0]", js_string!(&[0xD83D])),
@@ -860,9 +866,9 @@ fn search() {
 fn from_code_point() {
     // Taken from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/fromCodePoint
     run_test_actions([
-        TestAction::assert_eq("String.fromCodePoint(42)", "*"),
-        TestAction::assert_eq("String.fromCodePoint(65, 90)", "AZ"),
-        TestAction::assert_eq("String.fromCodePoint(0x404)", "Є"),
+        TestAction::assert_eq("String.fromCodePoint(42)", js_string!("*")),
+        TestAction::assert_eq("String.fromCodePoint(65, 90)", js_string!("AZ")),
+        TestAction::assert_eq("String.fromCodePoint(0x404)", js_string!("Є")),
         TestAction::assert_eq(
             "String.fromCodePoint(0x2f804)",
             js_string!(&[0xD87E, 0xDC04]),
@@ -876,7 +882,10 @@ fn from_code_point() {
             "String.fromCharCode(0xD800, 0xD8FF)",
             js_string!(&[0xD800, 0xD8FF]),
         ),
-        TestAction::assert_eq("String.fromCodePoint(9731, 9733, 9842, 0x4F60)", "☃★♲你"),
+        TestAction::assert_eq(
+            "String.fromCodePoint(9731, 9733, 9842, 0x4F60)",
+            js_string!("☃★♲你"),
+        ),
         TestAction::assert_native_error(
             "String.fromCodePoint('_')",
             JsNativeErrorKind::Range,

boa_engine/src/builtins/symbol/mod.rs

@@ -28,7 +28,7 @@ use crate::{
     object::JsObject,
     property::Attribute,
     realm::Realm,
-    string::utf16,
+    string::common::StaticJsStrings,
     symbol::JsSymbol,
     value::JsValue,
     Context, JsArgs, JsResult, JsString,
@@ -93,7 +93,7 @@ pub struct Symbol;
 
 impl IntrinsicObject for Symbol {
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
         let symbol_async_iterator = JsSymbol::async_iterator();
         let symbol_has_instance = JsSymbol::has_instance();
@@ -112,46 +112,50 @@ impl IntrinsicObject for Symbol {
         let attribute = Attribute::READONLY | Attribute::NON_ENUMERABLE | Attribute::PERMANENT;
 
         let to_primitive = BuiltInBuilder::callable(realm, Self::to_primitive)
-            .name("[Symbol.toPrimitive]")
+            .name(js_string!("[Symbol.toPrimitive]"))
             .length(1)
             .build();
 
         let get_description = BuiltInBuilder::callable(realm, Self::get_description)
-            .name("get description")
+            .name(js_string!("get description"))
             .build();
 
         BuiltInBuilder::from_standard_constructor::<Self>(realm)
-            .static_method(Self::for_, "for", 1)
-            .static_method(Self::key_for, "keyFor", 1)
-            .static_property(utf16!("asyncIterator"), symbol_async_iterator, attribute)
-            .static_property(utf16!("hasInstance"), symbol_has_instance, attribute)
+            .static_method(Self::for_, js_string!("for"), 1)
+            .static_method(Self::key_for, js_string!("keyFor"), 1)
             .static_property(
-                utf16!("isConcatSpreadable"),
+                js_string!("asyncIterator"),
+                symbol_async_iterator,
+                attribute,
+            )
+            .static_property(js_string!("hasInstance"), symbol_has_instance, attribute)
+            .static_property(
+                js_string!("isConcatSpreadable"),
                 symbol_is_concat_spreadable,
                 attribute,
             )
-            .static_property(utf16!("iterator"), symbol_iterator, attribute)
-            .static_property(utf16!("match"), symbol_match, attribute)
-            .static_property(utf16!("matchAll"), symbol_match_all, attribute)
-            .static_property(utf16!("replace"), symbol_replace, attribute)
-            .static_property(utf16!("search"), symbol_search, attribute)
-            .static_property(utf16!("species"), symbol_species, attribute)
-            .static_property(utf16!("split"), symbol_split, attribute)
+            .static_property(js_string!("iterator"), symbol_iterator, attribute)
+            .static_property(js_string!("match"), symbol_match, attribute)
+            .static_property(js_string!("matchAll"), symbol_match_all, attribute)
+            .static_property(js_string!("replace"), symbol_replace, attribute)
+            .static_property(js_string!("search"), symbol_search, attribute)
+            .static_property(js_string!("species"), symbol_species, attribute)
+            .static_property(js_string!("split"), symbol_split, attribute)
             .static_property(
-                utf16!("toPrimitive"),
+                js_string!("toPrimitive"),
                 symbol_to_primitive.clone(),
                 attribute,
             )
             .static_property(
-                utf16!("toStringTag"),
+                js_string!("toStringTag"),
                 symbol_to_string_tag.clone(),
                 attribute,
             )
-            .static_property(utf16!("unscopables"), symbol_unscopables, attribute)
-            .method(Self::to_string, "toString", 0)
-            .method(Self::value_of, "valueOf", 0)
+            .static_property(js_string!("unscopables"), symbol_unscopables, attribute)
+            .method(Self::to_string, js_string!("toString"), 0)
+            .method(Self::value_of, js_string!("valueOf"), 0)
             .accessor(
-                utf16!("description"),
+                js_string!("description"),
                 Some(get_description),
                 None,
                 Attribute::CONFIGURABLE | Attribute::NON_ENUMERABLE,
@@ -175,7 +179,7 @@ impl IntrinsicObject for Symbol {
 }
 
 impl BuiltInObject for Symbol {
-    const NAME: &'static str = "Symbol";
+    const NAME: JsString = StaticJsStrings::SYMBOL;
 }
 
 impl BuiltInConstructor for Symbol {

boa_engine/src/builtins/symbol/tests.rs

@@ -1,4 +1,4 @@
-use crate::{run_test_actions, JsValue, TestAction};
+use crate::{js_string, run_test_actions, JsValue, TestAction};
 use indoc::indoc;
 
 #[test]
@@ -12,7 +12,7 @@ fn call_symbol_and_check_return_type() {
 fn print_symbol_expect_description() {
     run_test_actions([TestAction::assert_eq(
         "String(Symbol('Hello'))",
-        "Symbol(Hello)",
+        js_string!("Symbol(Hello)"),
     )]);
 }
 

boa_engine/src/builtins/typed_array/mod.rs

@@ -29,22 +29,25 @@ use crate::{
     },
     property::{Attribute, PropertyNameKind},
     realm::Realm,
-    string::utf16,
+    string::{common::StaticJsStrings, utf16},
     symbol::JsSymbol,
     value::{IntegerOrInfinity, JsValue},
-    Context, JsArgs, JsResult,
+    Context, JsArgs, JsResult, JsString,
 };
 use boa_profiler::Profiler;
 use num_traits::Zero;
+use paste::paste;
 use std::cmp::Ordering;
 
 pub mod integer_indexed_object;
 
 macro_rules! typed_array {
-    ($ty:ident, $variant:ident, $name:literal, $global_object_name:ident) => {
-        #[doc = concat!("JavaScript `", $name, "` built-in implementation.")]
+    ($ty:ident, $variant:ident, $name:literal, $js_name:expr, $global_object_name:ident) => {
+        paste! {
+            #[doc = "JavaScript `" $name "` built-in implementation."]
             #[derive(Debug, Clone, Copy)]
             pub struct $ty;
+        }
 
         impl IntrinsicObject for $ty {
             fn get(intrinsics: &Intrinsics) -> JsObject {
@@ -52,10 +55,10 @@ macro_rules! typed_array {
             }
 
             fn init(realm: &Realm) {
-                let _timer = Profiler::global().start_event(Self::NAME, "init");
+                let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
 
                 let get_species = BuiltInBuilder::callable(realm, TypedArray::get_species)
-                    .name("get [Symbol.species]")
+                    .name(js_string!("get [Symbol.species]"))
                     .build();
 
                 BuiltInBuilder::from_standard_constructor::<Self>(realm)
@@ -76,12 +79,12 @@ macro_rules! typed_array {
                         Attribute::CONFIGURABLE,
                     )
                     .property(
-                        utf16!("BYTES_PER_ELEMENT"),
+                        js_string!("BYTES_PER_ELEMENT"),
                         TypedArrayKind::$variant.element_size(),
                         Attribute::READONLY | Attribute::NON_ENUMERABLE | Attribute::PERMANENT,
                     )
                     .static_property(
-                        utf16!("BYTES_PER_ELEMENT"),
+                        js_string!("BYTES_PER_ELEMENT"),
                         TypedArrayKind::$variant.element_size(),
                         Attribute::READONLY | Attribute::NON_ENUMERABLE | Attribute::PERMANENT,
                     )
@@ -90,7 +93,7 @@ macro_rules! typed_array {
         }
 
         impl BuiltInObject for $ty {
-            const NAME: &'static str = $name;
+            const NAME: JsString = $js_name;
 
             const ATTRIBUTE: Attribute = Attribute::WRITABLE
                 .union(Attribute::NON_ENUMERABLE)
@@ -244,31 +247,31 @@ pub(crate) struct TypedArray;
 impl IntrinsicObject for TypedArray {
     fn init(realm: &Realm) {
         let get_species = BuiltInBuilder::callable(realm, Self::get_species)
-            .name("get [Symbol.species]")
+            .name(js_string!("get [Symbol.species]"))
             .build();
 
         let get_buffer = BuiltInBuilder::callable(realm, Self::buffer)
-            .name("get buffer")
+            .name(js_string!("get buffer"))
             .build();
 
         let get_byte_length = BuiltInBuilder::callable(realm, Self::byte_length)
-            .name("get byteLength")
+            .name(js_string!("get byteLength"))
             .build();
 
         let get_byte_offset = BuiltInBuilder::callable(realm, Self::byte_offset)
-            .name("get byteOffset")
+            .name(js_string!("get byteOffset"))
             .build();
 
         let get_length = BuiltInBuilder::callable(realm, Self::length)
-            .name("get length")
+            .name(js_string!("get length"))
             .build();
 
         let get_to_string_tag = BuiltInBuilder::callable(realm, Self::to_string_tag)
-            .name("get [Symbol.toStringTag]")
+            .name(js_string!("get [Symbol.toStringTag]"))
             .build();
 
         let values_function = BuiltInBuilder::callable(realm, Self::values)
-            .name("values")
+            .name(js_string!("values"))
             .length(0)
             .build();
 
@@ -314,44 +317,44 @@ impl IntrinsicObject for TypedArray {
                 None,
                 Attribute::CONFIGURABLE | Attribute::NON_ENUMERABLE,
             )
-            .static_method(Self::from, "from", 1)
-            .static_method(Self::of, "of", 0)
-            .method(Self::at, "at", 1)
-            .method(Self::copy_within, "copyWithin", 2)
-            .method(Self::entries, "entries", 0)
-            .method(Self::every, "every", 1)
-            .method(Self::fill, "fill", 1)
-            .method(Self::filter, "filter", 1)
-            .method(Self::find, "find", 1)
-            .method(Self::find_index, "findIndex", 1)
-            .method(Self::find_last, "findLast", 1)
-            .method(Self::find_last_index, "findLastIndex", 1)
-            .method(Self::foreach, "forEach", 1)
-            .method(Self::includes, "includes", 1)
-            .method(Self::index_of, "indexOf", 1)
-            .method(Self::join, "join", 1)
-            .method(Self::keys, "keys", 0)
-            .method(Self::last_index_of, "lastIndexOf", 1)
-            .method(Self::map, "map", 1)
-            .method(Self::reduce, "reduce", 1)
-            .method(Self::reduceright, "reduceRight", 1)
-            .method(Self::reverse, "reverse", 0)
-            .method(Self::set, "set", 1)
-            .method(Self::slice, "slice", 2)
-            .method(Self::some, "some", 1)
-            .method(Self::sort, "sort", 1)
-            .method(Self::subarray, "subarray", 2)
-            .method(Self::to_locale_string, "toLocaleString", 0)
+            .static_method(Self::from, js_string!("from"), 1)
+            .static_method(Self::of, js_string!("of"), 0)
+            .method(Self::at, js_string!("at"), 1)
+            .method(Self::copy_within, js_string!("copyWithin"), 2)
+            .method(Self::entries, js_string!("entries"), 0)
+            .method(Self::every, js_string!("every"), 1)
+            .method(Self::fill, js_string!("fill"), 1)
+            .method(Self::filter, js_string!("filter"), 1)
+            .method(Self::find, js_string!("find"), 1)
+            .method(Self::find_index, js_string!("findIndex"), 1)
+            .method(Self::find_last, js_string!("findLast"), 1)
+            .method(Self::find_last_index, js_string!("findLastIndex"), 1)
+            .method(Self::foreach, js_string!("forEach"), 1)
+            .method(Self::includes, js_string!("includes"), 1)
+            .method(Self::index_of, js_string!("indexOf"), 1)
+            .method(Self::join, js_string!("join"), 1)
+            .method(Self::keys, js_string!("keys"), 0)
+            .method(Self::last_index_of, js_string!("lastIndexOf"), 1)
+            .method(Self::map, js_string!("map"), 1)
+            .method(Self::reduce, js_string!("reduce"), 1)
+            .method(Self::reduceright, js_string!("reduceRight"), 1)
+            .method(Self::reverse, js_string!("reverse"), 0)
+            .method(Self::set, js_string!("set"), 1)
+            .method(Self::slice, js_string!("slice"), 2)
+            .method(Self::some, js_string!("some"), 1)
+            .method(Self::sort, js_string!("sort"), 1)
+            .method(Self::subarray, js_string!("subarray"), 2)
+            .method(Self::to_locale_string, js_string!("toLocaleString"), 0)
             // 23.2.3.29 %TypedArray%.prototype.toString ( )
             // The initial value of the %TypedArray%.prototype.toString data property is the same
             // built-in function object as the Array.prototype.toString method defined in 23.1.3.30.
             .property(
-                utf16!("toString"),
+                js_string!("toString"),
                 realm.intrinsics().objects().array_prototype_to_string(),
                 Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE,
             )
             .property(
-                "values",
+                js_string!("values"),
                 values_function,
                 Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE,
             )
@@ -364,7 +367,7 @@ impl IntrinsicObject for TypedArray {
 }
 
 impl BuiltInObject for TypedArray {
-    const NAME: &'static str = "TypedArray";
+    const NAME: JsString = StaticJsStrings::TYPED_ARRAY;
 }
 
 impl BuiltInConstructor for TypedArray {
@@ -3676,19 +3679,19 @@ impl TypedArrayKind {
     }
 
     /// Gets the name of this typed array name.
-    pub(crate) const fn name(&self) -> &str {
+    pub(crate) const fn name(self) -> JsString {
         match self {
-            Self::Int8 => "Int8Array",
-            Self::Uint8 => "Uint8Array",
-            Self::Uint8Clamped => "Uint8ClampedArray",
-            Self::Int16 => "Int16Array",
-            Self::Uint16 => "Uint16Array",
-            Self::Int32 => "Int32Array",
-            Self::Uint32 => "Uint32Array",
-            Self::BigInt64 => "BigInt64Array",
-            Self::BigUint64 => "BigUint64Array",
-            Self::Float32 => "Float32Array",
-            Self::Float64 => "Float64Array",
+            Self::Int8 => StaticJsStrings::INT8_ARRAY,
+            Self::Uint8 => StaticJsStrings::UINT8_ARRAY,
+            Self::Uint8Clamped => StaticJsStrings::UINT8_CLAMPED_ARRAY,
+            Self::Int16 => StaticJsStrings::INT16_ARRAY,
+            Self::Uint16 => StaticJsStrings::UINT16_ARRAY,
+            Self::Int32 => StaticJsStrings::INT32_ARRAY,
+            Self::Uint32 => StaticJsStrings::UINT32_ARRAY,
+            Self::BigInt64 => StaticJsStrings::BIG_INT64_ARRAY,
+            Self::BigUint64 => StaticJsStrings::BIG_UINT64_ARRAY,
+            Self::Float32 => StaticJsStrings::FLOAT32_ARRAY,
+            Self::Float64 => StaticJsStrings::FLOAT64_ARRAY,
         }
     }
 
@@ -3697,29 +3700,80 @@ impl TypedArrayKind {
     }
 }
 
-typed_array!(Int8Array, Int8, "Int8Array", typed_int8_array);
-typed_array!(Uint8Array, Uint8, "Uint8Array", typed_uint8_array);
+typed_array!(
+    Int8Array,
+    Int8,
+    "Int8Array",
+    StaticJsStrings::INT8_ARRAY,
+    typed_int8_array
+);
+typed_array!(
+    Uint8Array,
+    Uint8,
+    "UInt8Array",
+    StaticJsStrings::UINT8_ARRAY,
+    typed_uint8_array
+);
 typed_array!(
     Uint8ClampedArray,
     Uint8Clamped,
-    "Uint8ClampedArray",
+    "UInt8ClampedArray",
+    StaticJsStrings::UINT8_CLAMPED_ARRAY,
     typed_uint8clamped_array
 );
-typed_array!(Int16Array, Int16, "Int16Array", typed_int16_array);
-typed_array!(Uint16Array, Uint16, "Uint16Array", typed_uint16_array);
-typed_array!(Int32Array, Int32, "Int32Array", typed_int32_array);
-typed_array!(Uint32Array, Uint32, "Uint32Array", typed_uint32_array);
+typed_array!(
+    Int16Array,
+    Int16,
+    "Int16Array",
+    StaticJsStrings::INT16_ARRAY,
+    typed_int16_array
+);
+typed_array!(
+    Uint16Array,
+    Uint16,
+    "UInt16Array",
+    StaticJsStrings::UINT16_ARRAY,
+    typed_uint16_array
+);
+typed_array!(
+    Int32Array,
+    Int32,
+    "Int32Array",
+    StaticJsStrings::INT32_ARRAY,
+    typed_int32_array
+);
+typed_array!(
+    Uint32Array,
+    Uint32,
+    "UInt32Array",
+    StaticJsStrings::UINT32_ARRAY,
+    typed_uint32_array
+);
 typed_array!(
     BigInt64Array,
     BigInt64,
     "BigInt64Array",
+    StaticJsStrings::BIG_INT64_ARRAY,
     typed_bigint64_array
 );
 typed_array!(
     BigUint64Array,
     BigUint64,
     "BigUint64Array",
+    StaticJsStrings::BIG_UINT64_ARRAY,
     typed_biguint64_array
 );
-typed_array!(Float32Array, Float32, "Float32Array", typed_float32_array);
-typed_array!(Float64Array, Float64, "Float64Array", typed_float64_array);
+typed_array!(
+    Float32Array,
+    Float32,
+    "Float32Array",
+    StaticJsStrings::FLOAT32_ARRAY,
+    typed_float32_array
+);
+typed_array!(
+    Float64Array,
+    Float64,
+    "Float64Array",
+    StaticJsStrings::FLOAT64_ARRAY,
+    typed_float64_array
+);

boa_engine/src/builtins/uri/mod.rs

@@ -25,7 +25,7 @@ use crate::{
     js_string,
     object::{JsFunction, JsObject},
     realm::Realm,
-    string::CodePoint,
+    string::{common::StaticJsStrings, CodePoint},
     Context, JsArgs, JsNativeError, JsResult, JsString, JsValue,
 };
 
@@ -93,7 +93,7 @@ impl IntrinsicObject for DecodeUri {
 }
 
 impl BuiltInObject for DecodeUri {
-    const NAME: &'static str = "decodeURI";
+    const NAME: JsString = StaticJsStrings::DECODE_URI;
 }
 
 pub(crate) struct DecodeUriComponent;
@@ -115,7 +115,7 @@ impl IntrinsicObject for DecodeUriComponent {
 }
 
 impl BuiltInObject for DecodeUriComponent {
-    const NAME: &'static str = "decodeURIComponent";
+    const NAME: JsString = StaticJsStrings::DECODE_URI_COMPONENT;
 }
 
 pub(crate) struct EncodeUri;
@@ -133,7 +133,7 @@ impl IntrinsicObject for EncodeUri {
 }
 
 impl BuiltInObject for EncodeUri {
-    const NAME: &'static str = "encodeURI";
+    const NAME: JsString = StaticJsStrings::ENCODE_URI;
 }
 pub(crate) struct EncodeUriComponent;
 
@@ -154,7 +154,7 @@ impl IntrinsicObject for EncodeUriComponent {
 }
 
 impl BuiltInObject for EncodeUriComponent {
-    const NAME: &'static str = "encodeURIComponent";
+    const NAME: JsString = StaticJsStrings::ENCODE_URI_COMPONENT;
 }
 
 /// Builtin JavaScript `decodeURI ( encodedURI )` function.

boa_engine/src/builtins/weak/weak_ref.rs

@@ -4,11 +4,13 @@ use boa_profiler::Profiler;
 use crate::{
     builtins::{BuiltInBuilder, BuiltInConstructor, BuiltInObject, IntrinsicObject},
     context::intrinsics::{Intrinsics, StandardConstructor, StandardConstructors},
+    js_string,
     object::{internal_methods::get_prototype_from_constructor, JsObject, ObjectData},
     property::Attribute,
     realm::Realm,
+    string::common::StaticJsStrings,
     symbol::JsSymbol,
-    Context, JsArgs, JsNativeError, JsResult, JsValue,
+    Context, JsArgs, JsNativeError, JsResult, JsString, JsValue,
 };
 
 /// Boa's implementation of ECMAScript's `WeakRef` builtin object.
@@ -30,20 +32,20 @@ impl IntrinsicObject for WeakRef {
     }
 
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
         BuiltInBuilder::from_standard_constructor::<Self>(realm)
             .property(
                 JsSymbol::to_string_tag(),
-                "WeakRef",
+                js_string!("WeakRef"),
                 Attribute::CONFIGURABLE,
             )
-            .method(Self::deref, "deref", 0)
+            .method(Self::deref, js_string!("deref"), 0)
             .build();
     }
 }
 
 impl BuiltInObject for WeakRef {
-    const NAME: &'static str = "WeakRef";
+    const NAME: JsString = StaticJsStrings::WEAK_REF;
 
     const ATTRIBUTE: Attribute = Attribute::WRITABLE.union(Attribute::CONFIGURABLE);
 }

boa_engine/src/builtins/weak_map/mod.rs

@@ -13,12 +13,13 @@ use crate::{
         IntrinsicObject,
     },
     context::intrinsics::{Intrinsics, StandardConstructor, StandardConstructors},
+    js_string,
     object::{internal_methods::get_prototype_from_constructor, JsObject, ObjectData},
     property::Attribute,
     realm::Realm,
-    string::utf16,
+    string::{common::StaticJsStrings, utf16},
     symbol::JsSymbol,
-    Context, JsArgs, JsNativeError, JsResult, JsValue,
+    Context, JsArgs, JsNativeError, JsResult, JsString, JsValue,
 };
 use boa_gc::{Finalize, Trace};
 use boa_profiler::Profiler;
@@ -32,23 +33,23 @@ impl IntrinsicObject for WeakMap {
     }
 
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
         BuiltInBuilder::from_standard_constructor::<Self>(realm)
             .property(
                 JsSymbol::to_string_tag(),
                 Self::NAME,
                 Attribute::READONLY | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE,
             )
-            .method(Self::delete, "delete", 1)
-            .method(Self::get, "get", 1)
-            .method(Self::has, "has", 1)
-            .method(Self::set, "set", 2)
+            .method(Self::delete, js_string!("delete"), 1)
+            .method(Self::get, js_string!("get"), 1)
+            .method(Self::has, js_string!("has"), 1)
+            .method(Self::set, js_string!("set"), 2)
             .build();
     }
 }
 
 impl BuiltInObject for WeakMap {
-    const NAME: &'static str = "WeakMap";
+    const NAME: JsString = StaticJsStrings::WEAK_MAP;
 
     const ATTRIBUTE: Attribute = Attribute::WRITABLE.union(Attribute::CONFIGURABLE);
 }

boa_engine/src/builtins/weak_set/mod.rs

@@ -10,12 +10,13 @@
 use crate::{
     builtins::{BuiltInBuilder, BuiltInConstructor, BuiltInObject, IntrinsicObject},
     context::intrinsics::{Intrinsics, StandardConstructor, StandardConstructors},
+    js_string,
     object::{internal_methods::get_prototype_from_constructor, JsObject, ObjectData},
     property::Attribute,
     realm::Realm,
-    string::utf16,
+    string::{common::StaticJsStrings, utf16},
     symbol::JsSymbol,
-    Context, JsArgs, JsNativeError, JsResult, JsValue,
+    Context, JsArgs, JsNativeError, JsResult, JsString, JsValue,
 };
 use boa_gc::{Finalize, Trace, WeakMap};
 use boa_profiler::Profiler;
@@ -29,22 +30,22 @@ impl IntrinsicObject for WeakSet {
     }
 
     fn init(realm: &Realm) {
-        let _timer = Profiler::global().start_event(Self::NAME, "init");
+        let _timer = Profiler::global().start_event(std::any::type_name::<Self>(), "init");
         BuiltInBuilder::from_standard_constructor::<Self>(realm)
             .property(
                 JsSymbol::to_string_tag(),
                 Self::NAME,
                 Attribute::READONLY | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE,
             )
-            .method(Self::add, "add", 1)
-            .method(Self::delete, "delete", 1)
-            .method(Self::has, "has", 1)
+            .method(Self::add, js_string!("add"), 1)
+            .method(Self::delete, js_string!("delete"), 1)
+            .method(Self::has, js_string!("has"), 1)
             .build();
     }
 }
 
 impl BuiltInObject for WeakSet {
-    const NAME: &'static str = "WeakSet";
+    const NAME: JsString = StaticJsStrings::WEAK_SET;
 
     const ATTRIBUTE: Attribute = Attribute::WRITABLE.union(Attribute::CONFIGURABLE);
 }

boa_engine/src/class.rs

@@ -67,6 +67,7 @@
 
 use crate::{
     error::JsNativeError,
+    js_string,
     native_function::NativeFunction,
     object::{ConstructorBuilder, JsFunction, JsObject, NativeObject, ObjectData, PROTOTYPE},
     property::{Attribute, PropertyDescriptor, PropertyKey},
@@ -121,7 +122,7 @@ impl<T: Class> ClassConstructor for T {
                 .into());
         }
 
-        let class = context.global_object().get(T::NAME, context)?;
+        let class = context.global_object().get(js_string!(T::NAME), context)?;
         let JsValue::Object(ref class_constructor) = class else {
             return Err(JsNativeError::typ()
                 .with_message(format!(
@@ -190,7 +191,8 @@ impl<'ctx, 'host> ClassBuilder<'ctx, 'host> {
     where
         N: AsRef<str>,
     {
-        self.builder.method(function, name.as_ref(), length);
+        self.builder
+            .method(function, js_string!(name.as_ref()), length);
         self
     }
 
@@ -206,7 +208,8 @@ impl<'ctx, 'host> ClassBuilder<'ctx, 'host> {
     where
         N: AsRef<str>,
     {
-        self.builder.static_method(function, name.as_ref(), length);
+        self.builder
+            .static_method(function, js_string!(name.as_ref()), length);
         self
     }
 

boa_engine/src/context/intrinsics.rs

@@ -191,7 +191,7 @@ impl Default for StandardConstructors {
             )),
             string: StandardConstructor::with_prototype(JsObject::from_proto_and_data(
                 None,
-                ObjectData::string("".into()),
+                ObjectData::string(js_string!()),
             )),
             regexp: StandardConstructor::default(),
             symbol: StandardConstructor::default(),

boa_engine/src/context/mod.rs

@@ -20,6 +20,7 @@ use crate::{
     builtins,
     class::{Class, ClassBuilder},
     job::{JobQueue, NativeJob, SimpleJobQueue},
+    js_string,
     module::{IdleModuleLoader, ModuleLoader, SimpleModuleLoader},
     native_function::NativeFunction,
     object::{shape::RootShape, FunctionObjectBuilder, JsObject},
@@ -28,7 +29,7 @@ use crate::{
     realm::Realm,
     script::Script,
     vm::{ActiveRunnable, CallFrame, Vm},
-    JsResult, JsValue, Source,
+    JsResult, JsString, JsValue, Source,
 };
 use boa_ast::{expression::Identifier, StatementList};
 use boa_interner::Interner;
@@ -48,6 +49,7 @@ use crate::vm::RuntimeLimits;
 ///
 /// ```rust
 /// use boa_engine::{
+///     js_string,
 ///     object::ObjectInitializer,
 ///     property::{Attribute, PropertyDescriptor},
 ///     Context, Source,
@@ -69,9 +71,9 @@ use crate::vm::RuntimeLimits;
 ///
 /// // Create an object that can be used in eval calls.
 /// let arg = ObjectInitializer::new(&mut context)
-///     .property("x", 12, Attribute::READONLY)
+///     .property(js_string!("x"), 12, Attribute::READONLY)
 ///     .build();
-/// context.register_global_property("arg", arg, Attribute::all());
+/// context.register_global_property(js_string!("arg"), arg, Attribute::all());
 ///
 /// let value = context.eval(Source::from_bytes("test(arg)")).unwrap();
 ///
@@ -196,6 +198,7 @@ impl<'host> Context<'host> {
     /// # Example
     /// ```
     /// use boa_engine::{
+    ///     js_string,
     ///     object::ObjectInitializer,
     ///     property::{Attribute, PropertyDescriptor},
     ///     Context,
@@ -204,15 +207,23 @@ impl<'host> Context<'host> {
     /// let mut context = Context::default();
     ///
     /// context
-    ///     .register_global_property("myPrimitiveProperty", 10, Attribute::all())
+    ///     .register_global_property(
+    ///         js_string!("myPrimitiveProperty"),
+    ///         10,
+    ///         Attribute::all(),
+    ///     )
     ///     .expect("property shouldn't exist");
     ///
     /// let object = ObjectInitializer::new(&mut context)
-    ///     .property("x", 0, Attribute::all())
-    ///     .property("y", 1, Attribute::all())
+    ///     .property(js_string!("x"), 0, Attribute::all())
+    ///     .property(js_string!("y"), 1, Attribute::all())
     ///     .build();
     /// context
-    ///     .register_global_property("myObjectProperty", object, Attribute::all())
+    ///     .register_global_property(
+    ///         js_string!("myObjectProperty"),
+    ///         object,
+    ///         Attribute::all(),
+    ///     )
     ///     .expect("property shouldn't exist");
     /// ```
     pub fn register_global_property<K, V>(
@@ -251,12 +262,12 @@ impl<'host> Context<'host> {
     /// can use the [`FunctionObjectBuilder`] API.
     pub fn register_global_callable(
         &mut self,
-        name: &str,
+        name: JsString,
         length: usize,
         body: NativeFunction,
     ) -> JsResult<()> {
         let function = FunctionObjectBuilder::new(&self.realm, body)
-            .name(name)
+            .name(name.clone())
             .length(length)
             .constructor(true)
             .build();
@@ -284,12 +295,12 @@ impl<'host> Context<'host> {
     /// `constructable`. Usage of the function as a constructor will produce a `TypeError`.
     pub fn register_global_builtin_callable(
         &mut self,
-        name: &str,
+        name: JsString,
         length: usize,
         body: NativeFunction,
     ) -> JsResult<()> {
         let function = FunctionObjectBuilder::new(&self.realm, body)
-            .name(name)
+            .name(name.clone())
             .length(length)
             .constructor(false)
             .build();
@@ -336,7 +347,7 @@ impl<'host> Context<'host> {
             .configurable(T::ATTRIBUTES.configurable());
 
         self.global_object()
-            .define_property_or_throw(T::NAME, property, self)?;
+            .define_property_or_throw(js_string!(T::NAME), property, self)?;
 
         Ok(())
     }

boa_engine/src/error.rs

@@ -2,6 +2,7 @@
 
 use crate::{
     builtins::{error::ErrorKind, Array},
+    js_string,
     object::JsObject,
     object::ObjectData,
     property::PropertyDescriptor,
@@ -28,11 +29,11 @@ use thiserror::Error;
 /// # Examples
 ///
 /// ```rust
-/// # use boa_engine::{JsError, JsNativeError, JsNativeErrorKind, JsValue};
-/// let cause = JsError::from_opaque("error!".into());
+/// # use boa_engine::{JsError, JsNativeError, JsNativeErrorKind, JsValue, js_string};
+/// let cause = JsError::from_opaque(js_string!("error!").into());
 ///
 /// assert!(cause.as_opaque().is_some());
-/// assert_eq!(cause.as_opaque().unwrap(), &JsValue::from("error!"));
+/// assert_eq!(cause.as_opaque().unwrap(), &JsValue::from(js_string!("error!")));
 ///
 /// let native_error: JsError = JsNativeError::typ()
 ///     .with_message("invalid type!")
@@ -228,21 +229,23 @@ impl JsError {
                     .as_error()
                     .ok_or_else(|| TryNativeError::NotAnErrorObject(val.clone()))?;
 
-                let try_get_property = |key, context: &mut Context<'_>| {
-                    obj.has_property(key, context)
+                let try_get_property = |key: JsString, name, context: &mut Context<'_>| {
+                    obj.has_property(key.clone(), context)
                         .map_err(|e| TryNativeError::InaccessibleProperty {
-                            property: key,
+                            property: name,
                             source: e,
                         })?
                         .then(|| obj.get(key, context))
                         .transpose()
                         .map_err(|e| TryNativeError::InaccessibleProperty {
-                            property: key,
+                            property: name,
                             source: e,
                         })
                 };
 
-                let message = if let Some(msg) = try_get_property("message", context)? {
+                let message = if let Some(msg) =
+                    try_get_property(js_string!("message"), "message", context)?
+                {
                     msg.as_string()
                         .map(JsString::to_std_string)
                         .transpose()
@@ -253,7 +256,7 @@ impl JsError {
                     Box::default()
                 };
 
-                let cause = try_get_property("cause", context)?;
+                let cause = try_get_property(js_string!("cause"), "cause", context)?;
 
                 let kind = match error {
                     ErrorKind::Error => JsNativeErrorKind::Error,
@@ -297,7 +300,7 @@ impl JsError {
                     }
                 };
 
-                let realm = try_get_property("constructor", context)?
+                let realm = try_get_property(js_string!("constructor"), "constructor", context)?
                     .as_ref()
                     .and_then(JsValue::as_constructor)
                     .ok_or(TryNativeError::InvalidConstructor)?
@@ -769,14 +772,17 @@ impl JsNativeError {
     /// # Examples
     ///
     /// ```rust
-    /// # use boa_engine::{Context, JsError, JsNativeError};
+    /// # use boa_engine::{Context, JsError, JsNativeError, js_string};
     /// let context = &mut Context::default();
     ///
     /// let error = JsNativeError::error().with_message("error!");
     /// let error_obj = error.to_opaque(context);
     ///
     /// assert!(error_obj.borrow().is_error());
-    /// assert_eq!(error_obj.get("message", context).unwrap(), "error!".into())
+    /// assert_eq!(
+    ///     error_obj.get(js_string!("message"), context).unwrap(),
+    ///     js_string!("error!").into()
+    /// )
     /// ```
     ///
     /// # Panics
@@ -828,11 +834,15 @@ impl JsNativeError {
             ObjectData::error(tag),
         );
 
-        o.create_non_enumerable_data_property_or_throw(utf16!("message"), &**message, context);
+        o.create_non_enumerable_data_property_or_throw(
+            js_string!("message"),
+            js_string!(&**message),
+            context,
+        );
 
         if let Some(cause) = cause {
             o.create_non_enumerable_data_property_or_throw(
-                utf16!("cause"),
+                js_string!("cause"),
                 cause.to_opaque(context),
                 context,
             );
@@ -845,7 +855,7 @@ impl JsNativeError {
                 .collect::<Vec<_>>();
             let errors = Array::create_array_from_list(errors, context);
             o.define_property_or_throw(
-                utf16!("errors"),
+                js_string!("errors"),
                 PropertyDescriptor::builder()
                     .configurable(true)
                     .enumerable(false)

boa_engine/src/object/builtins/jsdate.rs

@@ -18,7 +18,9 @@ use crate::{
 /// Create a `JsDate` object and set date to December 4 1995
 ///
 /// ```
-/// use boa_engine::{object::builtins::JsDate, Context, JsResult, JsValue};
+/// use boa_engine::{
+///     js_string, object::builtins::JsDate, Context, JsResult, JsValue,
+/// };
 ///
 /// fn main() -> JsResult<()> {
 ///     // JS mutable Context
@@ -30,7 +32,7 @@ use crate::{
 ///
 ///     assert_eq!(
 ///         date.to_date_string(context)?,
-///         JsValue::from("Mon Dec 04 1995")
+///         JsValue::from(js_string!("Mon Dec 04 1995"))
 ///     );
 ///
 ///     Ok(())

boa_engine/src/object/builtins/jsmap.rs

@@ -20,7 +20,7 @@ use std::ops::Deref;
 /// ```
 /// # use boa_engine::{
 /// #  object::builtins::JsMap,
-/// #  Context, JsValue, JsResult,
+/// #  Context, JsValue, JsResult, js_string
 /// # };
 /// # fn main() -> JsResult<()> {
 /// // Create default `Context`
@@ -30,8 +30,8 @@ use std::ops::Deref;
 /// let map = JsMap::new(context);
 ///
 /// // Set key-value pairs for the `JsMap`.
-/// map.set("Key-1", "Value-1", context)?;
-/// map.set("Key-2", 10, context)?;
+/// map.set(js_string!("Key-1"), js_string!("Value-1"), context)?;
+/// map.set(js_string!("Key-2"), 10, context)?;
 ///
 /// assert_eq!(map.get_size(context)?, 2.into());
 /// # Ok(())
@@ -42,7 +42,7 @@ use std::ops::Deref;
 /// ```
 /// # use boa_engine::{
 /// #    object::builtins::{JsArray, JsMap},
-/// #    Context, JsValue, JsResult,
+/// #    Context, JsValue, JsResult, js_string
 /// # };
 /// # fn main() -> JsResult<()> {
 /// // Create a default `Context`
@@ -52,7 +52,10 @@ use std::ops::Deref;
 /// let js_array = JsArray::new(context);
 ///
 /// // Create a `[key, value]` pair of JsValues
-/// let vec_one: Vec<JsValue> = vec![JsValue::new("first-key"), JsValue::new("first-value")];
+/// let vec_one: Vec<JsValue> = vec![
+///     js_string!("first-key").into(),
+///     js_string!("first-value").into()
+/// ];
 ///
 /// // We create an push our `[key, value]` pair onto our array as a `JsArray`
 /// js_array.push(JsArray::from_iter(vec_one, context), context)?;
@@ -61,8 +64,8 @@ use std::ops::Deref;
 /// let js_iterable_map = JsMap::from_js_iterable(&js_array.into(), context)?;
 ///
 /// assert_eq!(
-///     js_iterable_map.get("first-key", context)?,
-///     "first-value".into()
+///     js_iterable_map.get(js_string!("first-key"), context)?,
+///     js_string!("first-value").into()
 /// );
 ///
 /// # Ok(())
@@ -99,7 +102,7 @@ impl JsMap {
     /// ```
     /// # use boa_engine::{
     /// #    object::builtins::{JsArray, JsMap},
-    /// #    Context, JsResult, JsValue,
+    /// #    Context, JsResult, JsValue, js_string
     /// # };
     /// # fn main() -> JsResult<()> {
     /// # // Create a default `Context`
@@ -108,7 +111,10 @@ impl JsMap {
     /// let js_array = JsArray::new(context);
     ///
     /// // Create a `[key, value]` pair of JsValues and add it to the `JsArray` as a `JsArray`
-    /// let vec_one: Vec<JsValue> = vec![JsValue::new("first-key"), JsValue::new("first-value")];
+    /// let vec_one: Vec<JsValue> = vec![
+    ///     js_string!("first-key").into(),
+    ///     js_string!("first-value").into()
+    /// ];
     /// js_array.push(JsArray::from_iter(vec_one, context), context)?;
     ///
     /// // Create a `JsMap` from the `JsArray` using it's iterable property.
@@ -217,16 +223,19 @@ impl JsMap {
     /// ```
     /// # use boa_engine::{
     /// #    object::builtins::JsMap,
-    /// #    Context, JsValue, JsResult,
+    /// #    Context, JsValue, JsResult, js_string
     /// # };
     /// # fn main() -> JsResult<()> {
     /// # let context = &mut Context::default();
     /// let js_map = JsMap::new(context);
     ///
-    /// js_map.set("foo", "bar", context)?;
+    /// js_map.set(js_string!("foo"), js_string!("bar"), context)?;
     /// js_map.set(2, 4, context)?;
     ///
-    /// assert_eq!(js_map.get("foo", context)?, "bar".into());
+    /// assert_eq!(
+    ///     js_map.get(js_string!("foo"), context)?,
+    ///     js_string!("bar").into()
+    /// );
     /// assert_eq!(js_map.get(2, context)?, 4.into());
     /// # Ok(())
     /// # }
@@ -250,13 +259,13 @@ impl JsMap {
     /// ```
     /// # use boa_engine::{
     /// #    object::builtins::JsMap,
-    /// #    Context, JsValue, JsResult,
+    /// #    Context, JsValue, JsResult, js_string
     /// # };
     /// # fn main() -> JsResult<()> {
     /// # let context = &mut Context::default();
     /// let js_map = JsMap::new(context);
     ///
-    /// js_map.set("foo", "bar", context)?;
+    /// js_map.set(js_string!("foo"), js_string!("bar"), context)?;
     ///
     /// let map_size = js_map.get_size(context)?;
     ///
@@ -276,18 +285,21 @@ impl JsMap {
     /// ```
     /// # use boa_engine::{
     /// #    object::builtins::JsMap,
-    /// #    Context, JsValue, JsResult,
+    /// #    Context, JsValue, JsResult, js_string
     /// # };
     /// # fn main() -> JsResult<()> {
     /// # let context = &mut Context::default();
     /// let js_map = JsMap::new(context);
-    /// js_map.set("foo", "bar", context)?;
-    /// js_map.set("hello", "world", context)?;
+    /// js_map.set(js_string!("foo"), js_string!("bar"), context)?;
+    /// js_map.set(js_string!("hello"), js_string!("world"), context)?;
     ///
-    /// js_map.delete("foo", context)?;
+    /// js_map.delete(js_string!("foo"), context)?;
     ///
     /// assert_eq!(js_map.get_size(context)?, 1.into());
-    /// assert_eq!(js_map.get("foo", context)?, JsValue::undefined());
+    /// assert_eq!(
+    ///     js_map.get(js_string!("foo"), context)?,
+    ///     JsValue::undefined()
+    /// );
     /// # Ok(())
     /// # }
     /// ```
@@ -305,16 +317,16 @@ impl JsMap {
     /// ```
     /// # use boa_engine::{
     /// #    object::builtins::JsMap,
-    /// #    Context, JsValue, JsResult,
+    /// #    Context, JsValue, JsResult, js_string
     /// # };
     /// # fn main() -> JsResult<()> {
     /// # let context = &mut Context::default();
     /// let js_map = JsMap::new(context);
-    /// js_map.set("foo", "bar", context)?;
+    /// js_map.set(js_string!("foo"), js_string!("bar"), context)?;
     ///
-    /// let retrieved_value = js_map.get("foo", context)?;
+    /// let retrieved_value = js_map.get(js_string!("foo"), context)?;
     ///
-    /// assert_eq!(retrieved_value, "bar".into());
+    /// assert_eq!(retrieved_value, js_string!("bar").into());
     /// # Ok(())
     /// # }
     /// ```
@@ -332,13 +344,13 @@ impl JsMap {
     /// ```
     /// # use boa_engine::{
     /// #    object::builtins::JsMap,
-    /// #    Context, JsValue, JsResult,
+    /// #    Context, JsValue, JsResult, js_string
     /// # };
     /// # fn main() -> JsResult<()> {
     /// # let context = &mut Context::default();
     /// let js_map = JsMap::new(context);
-    /// js_map.set("foo", "bar", context)?;
-    /// js_map.set("hello", "world", context)?;
+    /// js_map.set(js_string!("foo"), js_string!("bar"), context)?;
+    /// js_map.set(js_string!("hello"), js_string!("world"), context)?;
     ///
     /// js_map.clear(context)?;
     ///
@@ -358,14 +370,14 @@ impl JsMap {
     /// ```
     /// # use boa_engine::{
     /// #    object::builtins::JsMap,
-    /// #    Context, JsValue, JsResult,
+    /// #    Context, JsValue, JsResult, js_string
     /// # };
     /// # fn main() -> JsResult<()> {
     /// # let context = &mut Context::default();
     /// let js_map = JsMap::new(context);
-    /// js_map.set("foo", "bar", context)?;
+    /// js_map.set(js_string!("foo"), js_string!("bar"), context)?;
     ///
-    /// let has_key = js_map.has("foo", context)?;
+    /// let has_key = js_map.has(js_string!("foo"), context)?;
     ///
     /// assert_eq!(has_key, true.into());
     /// # Ok(())

boa_engine/src/object/builtins/jspromise.rs

@@ -35,7 +35,11 @@ use boa_gc::{Finalize, Gc, GcRefCell, Trace};
 /// # fn main() -> Result<(), Box<dyn Error>> {
 /// let context = &mut Context::default();
 ///
-/// context.register_global_property("finally", false, Attribute::all());
+/// context.register_global_property(
+///     js_string!("finally"),
+///     false,
+///     Attribute::all(),
+/// );
 ///
 /// let promise = JsPromise::new(
 ///     |resolvers, context| {
@@ -82,7 +86,7 @@ use boa_gc::{Finalize, Gc, GcRefCell, Trace};
 ///             context.realm(),
 ///             NativeFunction::from_fn_ptr(|_, _, context| {
 ///                 context.global_object().clone().set(
-///                     "finally",
+///                     js_string!("finally"),
 ///                     JsValue::from(true),
 ///                     true,
 ///                     context,
@@ -102,7 +106,10 @@ use boa_gc::{Finalize, Gc, GcRefCell, Trace};
 /// );
 ///
 /// assert_eq!(
-///     context.global_object().clone().get("finally", context)?,
+///     context
+///         .global_object()
+///         .clone()
+///         .get(js_string!("finally"), context)?,
 ///     JsValue::from(true)
 /// );
 ///
@@ -617,12 +624,16 @@ impl JsPromise {
     /// # use boa_engine::{
     /// #     object::{builtins::JsPromise, FunctionObjectBuilder},
     /// #     property::Attribute,
-    /// #     Context, JsNativeError, JsValue, NativeFunction,
+    /// #     Context, JsNativeError, JsValue, NativeFunction, js_string
     /// # };
     /// # fn main() -> Result<(), Box<dyn Error>> {
     /// let context = &mut Context::default();
     ///
-    /// context.register_global_property("finally", false, Attribute::all());
+    /// context.register_global_property(
+    ///     js_string!("finally"),
+    ///     false,
+    ///     Attribute::all(),
+    /// );
     ///
     /// let promise = JsPromise::new(
     ///     |resolvers, context| {
@@ -642,7 +653,7 @@ impl JsPromise {
     ///         context.realm(),
     ///         NativeFunction::from_fn_ptr(|_, _, context| {
     ///             context.global_object().clone().set(
-    ///                 "finally",
+    ///                 js_string!("finally"),
     ///                 JsValue::from(true),
     ///                 true,
     ///                 context,
@@ -657,7 +668,10 @@ impl JsPromise {
     /// context.run_jobs();
     ///
     /// assert_eq!(
-    ///     context.global_object().clone().get("finally", context)?,
+    ///     context
+    ///         .global_object()
+    ///         .clone()
+    ///         .get(js_string!("finally"), context)?,
     ///     JsValue::from(true)
     /// );
     ///
@@ -788,19 +802,28 @@ impl JsPromise {
     /// let array = JsArray::from_object(array)?;
     ///
     /// let a = array.at(0, context)?.as_object().unwrap().clone();
-    /// assert_eq!(a.get("status", context)?, js_string!("fulfilled").into());
-    /// assert_eq!(a.get("value", context)?, 1.into());
+    /// assert_eq!(
+    ///     a.get(js_string!("status"), context)?,
+    ///     js_string!("fulfilled").into()
+    /// );
+    /// assert_eq!(a.get(js_string!("value"), context)?, 1.into());
     ///
     /// let b = array.at(1, context)?.as_object().unwrap().clone();
-    /// assert_eq!(b.get("status", context)?, js_string!("rejected").into());
     /// assert_eq!(
-    ///     b.get("reason", context)?.to_string(context)?,
+    ///     b.get(js_string!("status"), context)?,
+    ///     js_string!("rejected").into()
+    /// );
+    /// assert_eq!(
+    ///     b.get(js_string!("reason"), context)?.to_string(context)?,
     ///     js_string!("TypeError")
     /// );
     ///
     /// let c = array.at(2, context)?.as_object().unwrap().clone();
-    /// assert_eq!(c.get("status", context)?, js_string!("fulfilled").into());
-    /// assert_eq!(c.get("value", context)?, 3.into());
+    /// assert_eq!(
+    ///     c.get(js_string!("status"), context)?,
+    ///     js_string!("fulfilled").into()
+    /// );
+    /// assert_eq!(c.get(js_string!("value"), context)?, 3.into());
     ///
     /// # Ok(())
     /// # }

boa_engine/src/object/builtins/jsregexp.rs

@@ -18,16 +18,16 @@ use std::ops::Deref;
 /// ```
 /// # use boa_engine::{
 /// #  object::builtins::JsRegExp,
-/// #  Context, JsValue, JsResult,
+/// #  Context, JsValue, JsResult,js_string
 /// # };
 /// # fn main() -> JsResult<()> {
 /// // Initialize the `Context`
 /// let context = &mut Context::default();
 ///
 /// // Create a new RegExp with pattern and flags
-/// let regexp = JsRegExp::new("foo", "gi", context)?;
+/// let regexp = JsRegExp::new(js_string!("foo"), js_string!("gi"), context)?;
 ///
-/// let test_result = regexp.test("football", context)?;
+/// let test_result = regexp.test(js_string!("football"), context)?;
 /// assert!(test_result);
 ///
 /// let to_string = regexp.to_string(context)?;
@@ -45,14 +45,14 @@ impl JsRegExp {
     /// ```
     /// # use boa_engine::{
     /// #  object::builtins::JsRegExp,
-    /// #  Context, JsValue, JsResult,
+    /// #  Context, JsValue, JsResult, js_string
     /// # };
     /// # fn main() -> JsResult<()> {
     /// // Initialize the `Context`
     /// let context = &mut Context::default();
     ///
     /// // Create a new RegExp with pattern and flags
-    /// let regexp = JsRegExp::new("foo", "gi", context)?;
+    /// let regexp = JsRegExp::new(js_string!("foo"), js_string!("gi"), context)?;
     /// # Ok(())
     /// # }
     /// ```
@@ -141,11 +141,11 @@ impl JsRegExp {
     /// ```
     /// # use boa_engine::{
     /// #  object::builtins::JsRegExp,
-    /// #  Context, JsValue, JsResult,
+    /// #  Context, JsValue, JsResult, js_string
     /// # };
     /// # fn main() -> JsResult<()> {
     /// # let context = &mut Context::default();
-    /// let regexp = JsRegExp::new("foo", "gi", context)?;
+    /// let regexp = JsRegExp::new(js_string!("foo"), js_string!("gi"), context)?;
     ///
     /// let flags = regexp.flags(context)?;
     /// assert_eq!(flags, String::from("gi"));
@@ -166,11 +166,11 @@ impl JsRegExp {
     /// ```
     /// # use boa_engine::{
     /// #  object::builtins::JsRegExp,
-    /// #  Context, JsValue, JsResult,
+    /// #  Context, JsValue, JsResult, js_string
     /// # };
     /// # fn main() -> JsResult<()> {
     /// # let context = &mut Context::default();
-    /// let regexp = JsRegExp::new("foo", "gi", context)?;
+    /// let regexp = JsRegExp::new(js_string!("foo"), js_string!("gi"), context)?;
     ///
     /// let src = regexp.source(context)?;
     /// assert_eq!(src, String::from("foo"));
@@ -191,13 +191,13 @@ impl JsRegExp {
     /// ```
     /// # use boa_engine::{
     /// #  object::builtins::JsRegExp,
-    /// #  Context, JsValue, JsResult,
+    /// #  Context, JsValue, JsResult, js_string
     /// # };
     /// # fn main() -> JsResult<()> {
     /// # let context = &mut Context::default();
-    /// let regexp = JsRegExp::new("foo", "gi", context)?;
+    /// let regexp = JsRegExp::new(js_string!("foo"), js_string!("gi"), context)?;
     ///
-    /// let test_result = regexp.test("football", context)?;
+    /// let test_result = regexp.test(js_string!("football"), context)?;
     /// assert!(test_result);
     /// # Ok(())
     /// # }
@@ -233,14 +233,14 @@ impl JsRegExp {
     /// ```
     /// # use boa_engine::{
     /// #  object::builtins::JsRegExp,
-    /// #  Context, JsValue, JsResult,
+    /// #  Context, JsValue, JsResult, js_string
     /// # };
     /// # fn main() -> JsResult<()> {
     /// # let context = &mut Context::default();
-    /// let regexp = JsRegExp::new("foo", "gi", context)?;
+    /// let regexp = JsRegExp::new(js_string!("foo"), js_string!("gi"), context)?;
     ///
     /// let to_string = regexp.to_string(context)?;
-    /// assert_eq!(to_string, String::from("/foo/gi"));
+    /// assert_eq!(to_string, "/foo/gi");
     /// # Ok(())
     /// # }
     /// ```

boa_engine/src/object/internal_methods/integer_indexed.rs

@@ -45,7 +45,7 @@ fn canonical_numeric_index_string(argument: &JsString) -> Option<f64> {
     let n = argument.to_number();
 
     // 3. If ! ToString(n) is argument, return n.
-    if &JsString::from(Number::to_native_string(n)) == argument {
+    if &Number::to_js_string(n) == argument {
         return Some(n);
     }
 

boa_engine/src/object/jsobject.rs

@@ -10,6 +10,7 @@ use super::{
 use crate::{
     context::intrinsics::Intrinsics,
     error::JsNativeError,
+    js_string,
     object::{ObjectData, ObjectKind},
     property::{PropertyDescriptor, PropertyKey},
     string::utf16,
@@ -245,7 +246,7 @@ impl JsObject {
             // we're in a recursive object, bail
             return Ok(match hint {
                 PreferredType::Number => JsValue::new(0),
-                PreferredType::String => JsValue::new(""),
+                PreferredType::String => JsValue::new(js_string!()),
                 PreferredType::Default => unreachable!("checked type hint in step 2"),
             });
         }

boa_engine/src/object/mod.rs

@@ -2013,30 +2013,6 @@ pub struct FunctionBinding {
     pub(crate) name: JsString,
 }
 
-impl From<&str> for FunctionBinding {
-    #[inline]
-    fn from(name: &str) -> Self {
-        let name: JsString = name.into();
-
-        Self {
-            binding: name.clone().into(),
-            name,
-        }
-    }
-}
-
-impl From<String> for FunctionBinding {
-    #[inline]
-    fn from(name: String) -> Self {
-        let name: JsString = name.into();
-
-        Self {
-            binding: name.clone().into(),
-            name,
-        }
-    }
-}
-
 impl From<JsString> for FunctionBinding {
     #[inline]
     fn from(name: JsString) -> Self {
@@ -2146,15 +2122,16 @@ impl<'realm> FunctionObjectBuilder<'realm> {
 /// #     JsValue,
 /// #     NativeFunction,
 /// #     object::ObjectInitializer,
-/// #     property::Attribute
+/// #     property::Attribute,
+/// #     js_string,
 /// # };
 /// let mut context = Context::default();
 /// let object = ObjectInitializer::new(&mut context)
-///     .property("hello", "world", Attribute::all())
+///     .property(js_string!("hello"), js_string!("world"), Attribute::all())
 ///     .property(1, 1, Attribute::all())
 ///     .function(
 ///         NativeFunction::from_fn_ptr(|_, _, _| Ok(JsValue::undefined())),
-///         "func",
+///         js_string!("func"),
 ///         0,
 ///     )
 ///     .build();

boa_engine/src/optimizer/pass/constant_folding.rs

@@ -82,7 +82,7 @@ impl ConstantFolding {
                 },
             ),
             (literal, UnaryOp::TypeOf) => Ok(JsValue::new(
-                literal_to_js_value(literal, context).type_of(),
+                literal_to_js_value(literal, context).js_type_of(),
             )),
             (_, UnaryOp::Delete) => {
                 return PassAction::Replace(Expression::Literal(Literal::Bool(true)))

boa_engine/src/property/mod.rs

@@ -678,28 +678,6 @@ impl From<JsString> for PropertyKey {
     }
 }
 
-impl From<&str> for PropertyKey {
-    #[inline]
-    fn from(string: &str) -> Self {
-        parse_u32_index(string.bytes()).map_or_else(|| Self::String(string.into()), Self::Index)
-    }
-}
-
-impl From<String> for PropertyKey {
-    #[inline]
-    fn from(string: String) -> Self {
-        parse_u32_index(string.bytes()).map_or_else(|| Self::String(string.into()), Self::Index)
-    }
-}
-
-impl From<Box<str>> for PropertyKey {
-    #[inline]
-    fn from(string: Box<str>) -> Self {
-        parse_u32_index(string.bytes())
-            .map_or_else(|| Self::String(string.as_ref().into()), Self::Index)
-    }
-}
-
 impl From<JsSymbol> for PropertyKey {
     #[inline]
     fn from(symbol: JsSymbol) -> Self {
@@ -737,7 +715,7 @@ impl From<PropertyKey> for JsValue {
         match property_key {
             PropertyKey::String(ref string) => string.clone().into(),
             PropertyKey::Symbol(ref symbol) => symbol.clone().into(),
-            PropertyKey::Index(index) => index.to_string().into(),
+            PropertyKey::Index(index) => js_string!(index.to_string()).into(),
         }
     }
 }

boa_engine/src/string/common.rs

@@ -4,17 +4,20 @@ use crate::tagged::Tagged;
 
 use super::JsString;
 use boa_macros::utf16;
+use paste::paste;
 use rustc_hash::{FxHashMap, FxHasher};
 
 macro_rules! well_known_statics {
     ( $( $(#[$attr:meta])* ($name:ident, $string:literal) ),+$(,)? ) => {
         $(
-            $(#[$attr])* pub(crate) const fn $name() -> JsString {
-                JsString {
+            paste!{
+                #[doc = "Gets the static `JsString` for `\"" $string "\"`."]
+                #[allow(unused)]
+                pub(crate) const $name: JsString = JsString {
                     ptr: Tagged::from_tag(
                         Self::find_index(utf16!($string)),
                     ),
-                }
+                };
             }
         )+
     };
@@ -74,35 +77,89 @@ impl StaticJsStrings {
         RAW_STATICS.get(index).copied()
     }
 
+    // Some consts are only used on certain features, which triggers the unused lint.
     well_known_statics! {
-        /// Gets the empty string (`""`) `JsString`.
-        (empty_string, ""),
-        /// Gets the static `JsString` for `"Symbol.asyncIterator"`.
-        (symbol_async_iterator, "Symbol.asyncIterator"),
-        /// Gets the static `JsString` for `"Symbol.hasInstance"`.
-        (symbol_has_instance, "Symbol.hasInstance"),
-        /// Gets the static `JsString` for `"Symbol.isConcatSpreadable"`.
-        (symbol_is_concat_spreadable, "Symbol.isConcatSpreadable"),
-        /// Gets the static `JsString` for `"Symbol.iterator"`.
-        (symbol_iterator, "Symbol.iterator"),
-        /// Gets the static `JsString` for `"Symbol.match"`.
-        (symbol_match, "Symbol.match"),
-        /// Gets the static `JsString` for `"Symbol.matchAll"`.
-        (symbol_match_all, "Symbol.matchAll"),
-        /// Gets the static `JsString` for `"Symbol.replace"`.
-        (symbol_replace, "Symbol.replace"),
-        /// Gets the static `JsString` for `"Symbol.search"`.
-        (symbol_search, "Symbol.search"),
-        /// Gets the static `JsString` for `"Symbol.species"`.
-        (symbol_species, "Symbol.species"),
-        /// Gets the static `JsString` for `"Symbol.split"`.
-        (symbol_split, "Symbol.split"),
-        /// Gets the static `JsString` for `"Symbol.toPrimitive"`.
-        (symbol_to_primitive, "Symbol.toPrimitive"),
-        /// Gets the static `JsString` for `"Symbol.toStringTag"`.
-        (symbol_to_string_tag, "Symbol.toStringTag"),
-        /// Gets the static `JsString` for `"Symbol.unscopables"`.
-        (symbol_unscopables, "Symbol.unscopables"),
+        (EMPTY_STRING, ""),
+        // Symbols
+        (SYMBOL_ASYNC_ITERATOR, "Symbol.asyncIterator"),
+        (SYMBOL_HAS_INSTANCE, "Symbol.hasInstance"),
+        (SYMBOL_IS_CONCAT_SPREADABLE, "Symbol.isConcatSpreadable"),
+        (SYMBOL_ITERATOR, "Symbol.iterator"),
+        (SYMBOL_MATCH, "Symbol.match"),
+        (SYMBOL_MATCH_ALL, "Symbol.matchAll"),
+        (SYMBOL_REPLACE, "Symbol.replace"),
+        (SYMBOL_SEARCH, "Symbol.search"),
+        (SYMBOL_SPECIES, "Symbol.species"),
+        (SYMBOL_SPLIT, "Symbol.split"),
+        (SYMBOL_TO_PRIMITIVE, "Symbol.toPrimitive"),
+        (SYMBOL_TO_STRING_TAG, "Symbol.toStringTag"),
+        (SYMBOL_UNSCOPABLES, "Symbol.unscopables"),
+        // Builtins
+        (ARRAY, "Array"),
+        (ARRAY_BUFFER, "ArrayBuffer"),
+        (ASYNC_FUNCTION, "AsyncFunction"),
+        (ASYNC_GENERATOR, "AsyncGenerator"),
+        (ASYNC_GENERATOR_FUNCTION, "AsyncGeneratorFunction"),
+        (BIG_INT, "BigInt"),
+        (BOOLEAN, "Boolean"),
+        (DATA_VIEW, "DataView"),
+        (DATE, "Date"),
+        (ERROR, "Error"),
+        (AGGREGATE_ERROR, "AggregateError"),
+        (EVAL_ERROR, "EvalError"),
+        (RANGE_ERROR, "RangeError"),
+        (REFERENCE_ERROR, "ReferenceError"),
+        (SYNTAX_ERROR, "SyntaxError"),
+        (TYPE_ERROR, "TypeError"),
+        (URI_ERROR, "URIError"),
+        (ESCAPE, "escape"),
+        (UNESCAPE, "unescape"),
+        (EVAL, "eval"),
+        (FUNCTION, "Function"),
+        (GENERATOR, "Generator"),
+        (GENERATOR_FUNCTION, "GeneratorFunction"),
+        (INTL, "Intl"),
+        (COLLATOR, "Collator"),
+        (LIST_FORMAT, "ListFormat"),
+        (LOCALE, "Locale"),
+        (PLURAL_RULES, "PluralRules"),
+        (SEGMENTER, "Segmenter"),
+        (DATE_TIME_FORMAT, "DateTimeFormat"),
+        (JSON, "JSON"),
+        (MAP, "Map"),
+        (MATH, "Math"),
+        (NUMBER, "Number"),
+        (IS_FINITE, "isFinite"),
+        (IS_NAN, "isNaN"),
+        (PARSE_INT, "parseInt"),
+        (PARSE_FLOAT, "parseFloat"),
+        (OBJECT, "Object"),
+        (PROMISE, "Promise"),
+        (PROXY, "Proxy"),
+        (REFLECT, "Reflect"),
+        (REG_EXP, "RegExp"),
+        (SET, "Set"),
+        (STRING, "String"),
+        (SYMBOL, "Symbol"),
+        (TYPED_ARRAY, "TypedArray"),
+        (INT8_ARRAY, "Int8Array"),
+        (UINT8_ARRAY, "Uint8Array"),
+        (UINT8_CLAMPED_ARRAY, "Uint8ClampedArray"),
+        (INT16_ARRAY, "Int16Array"),
+        (UINT16_ARRAY, "Uint16Array"),
+        (INT32_ARRAY, "Int32Array"),
+        (UINT32_ARRAY, "Uint32Array"),
+        (BIG_INT64_ARRAY, "BigInt64Array"),
+        (BIG_UINT64_ARRAY, "BigUint64Array"),
+        (FLOAT32_ARRAY, "Float32Array"),
+        (FLOAT64_ARRAY, "Float64Array"),
+        (ENCODE_URI, "encodeURI"),
+        (ENCODE_URI_COMPONENT, "encodeURIComponent"),
+        (DECODE_URI, "decodeURI"),
+        (DECODE_URI_COMPONENT, "decodeURIComponent"),
+        (WEAK_REF, "WeakRef"),
+        (WEAK_MAP, "WeakMap"),
+        (WEAK_SET, "WeakSet"),
     }
 }
 
@@ -136,11 +193,101 @@ thread_local! {
 }
 
 /// Array of raw static strings that aren't reference counted.
-///
-/// The macro `static_strings` automatically sorts the array of strings, making it faster
-/// for searches by using `binary_search`.
 const RAW_STATICS: &[&[u16]] = &[
     utf16!(""),
+    // Well known symbols
+    utf16!("Symbol.asyncIterator"),
+    utf16!("[Symbol.asyncIterator]"),
+    utf16!("Symbol.hasInstance"),
+    utf16!("[Symbol.hasInstance]"),
+    utf16!("Symbol.isConcatSpreadable"),
+    utf16!("[Symbol.isConcatSpreadable]"),
+    utf16!("Symbol.iterator"),
+    utf16!("[Symbol.iterator]"),
+    utf16!("Symbol.match"),
+    utf16!("[Symbol.match]"),
+    utf16!("Symbol.matchAll"),
+    utf16!("[Symbol.matchAll]"),
+    utf16!("Symbol.replace"),
+    utf16!("[Symbol.replace]"),
+    utf16!("Symbol.search"),
+    utf16!("[Symbol.search]"),
+    utf16!("Symbol.species"),
+    utf16!("[Symbol.species]"),
+    utf16!("Symbol.split"),
+    utf16!("[Symbol.split]"),
+    utf16!("Symbol.toPrimitive"),
+    utf16!("[Symbol.toPrimitive]"),
+    utf16!("Symbol.toStringTag"),
+    utf16!("[Symbol.toStringTag]"),
+    utf16!("Symbol.unscopables"),
+    utf16!("[Symbol.unscopables]"),
+    // Well known builtins
+    utf16!("Array"),
+    utf16!("ArrayBuffer"),
+    utf16!("AsyncFunction"),
+    utf16!("AsyncGenerator"),
+    utf16!("AsyncGeneratorFunction"),
+    utf16!("BigInt"),
+    utf16!("Boolean"),
+    utf16!("DataView"),
+    utf16!("Date"),
+    utf16!("Error"),
+    utf16!("AggregateError"),
+    utf16!("EvalError"),
+    utf16!("RangeError"),
+    utf16!("ReferenceError"),
+    utf16!("SyntaxError"),
+    utf16!("TypeError"),
+    utf16!("URIError"),
+    utf16!("escape"),
+    utf16!("unescape"),
+    utf16!("eval"),
+    utf16!("Function"),
+    utf16!("Generator"),
+    utf16!("GeneratorFunction"),
+    utf16!("Intl"),
+    utf16!("Collator"),
+    utf16!("ListFormat"),
+    utf16!("Locale"),
+    utf16!("PluralRules"),
+    utf16!("Segmenter"),
+    utf16!("DateTimeFormat"),
+    utf16!("JSON"),
+    utf16!("Map"),
+    utf16!("Math"),
+    utf16!("Number"),
+    utf16!("isFinite"),
+    utf16!("isNaN"),
+    utf16!("parseInt"),
+    utf16!("parseFloat"),
+    utf16!("Object"),
+    utf16!("Promise"),
+    utf16!("Proxy"),
+    utf16!("Reflect"),
+    utf16!("RegExp"),
+    utf16!("Set"),
+    utf16!("String"),
+    utf16!("Symbol"),
+    utf16!("TypedArray"),
+    utf16!("Int8Array"),
+    utf16!("Uint8Array"),
+    utf16!("Uint8ClampedArray"),
+    utf16!("Int16Array"),
+    utf16!("Uint16Array"),
+    utf16!("Int32Array"),
+    utf16!("Uint32Array"),
+    utf16!("BigInt64Array"),
+    utf16!("BigUint64Array"),
+    utf16!("Float32Array"),
+    utf16!("Float64Array"),
+    utf16!("encodeURI"),
+    utf16!("encodeURIComponent"),
+    utf16!("decodeURI"),
+    utf16!("decodeURIComponent"),
+    utf16!("WeakRef"),
+    utf16!("WeakMap"),
+    utf16!("WeakSet"),
     // Misc
     utf16!(","),
     utf16!(":"),
@@ -197,14 +344,10 @@ const RAW_STATICS: &[&[u16]] = &[
     utf16!("entries"),
     utf16!("fromEntries"),
     // Function object
-    utf16!("Function"),
     utf16!("apply"),
     utf16!("bind"),
     utf16!("call"),
-    // Generator object
-    utf16!("Generator"),
     // Array object
-    utf16!("Array"),
     utf16!("at"),
     utf16!("from"),
     utf16!("isArray"),
@@ -237,7 +380,6 @@ const RAW_STATICS: &[&[u16]] = &[
     utf16!("push"),
     utf16!("pop"),
     // String object
-    utf16!("String"),
     utf16!("charAt"),
     utf16!("charCodeAt"),
     utf16!("codePointAt"),
@@ -267,13 +409,8 @@ const RAW_STATICS: &[&[u16]] = &[
     utf16!("trimEnd"),
     utf16!("trimStart"),
     // Number object
-    utf16!("Number"),
     utf16!("Infinity"),
     utf16!("NaN"),
-    utf16!("parseInt"),
-    utf16!("parseFloat"),
-    utf16!("isFinite"),
-    utf16!("isNaN"),
     utf16!("EPSILON"),
     utf16!("MAX_SAFE_INTEGER"),
     utf16!("MIN_SAFE_INTEGER"),
@@ -284,14 +421,10 @@ const RAW_STATICS: &[&[u16]] = &[
     utf16!("toExponential"),
     utf16!("toFixed"),
     utf16!("toPrecision"),
-    // Boolean object
-    utf16!("Boolean"),
     // BigInt object
-    utf16!("BigInt"),
     utf16!("asIntN"),
     utf16!("asUintN"),
     // RegExp object
-    utf16!("RegExp"),
     utf16!("exec"),
     utf16!("test"),
     utf16!("flags"),
@@ -314,7 +447,6 @@ const RAW_STATICS: &[&[u16]] = &[
     utf16!("get flags"),
     utf16!("get source"),
     // Symbol object
-    utf16!("Symbol"),
     utf16!("for"),
     utf16!("keyFor"),
     utf16!("description"),
@@ -327,32 +459,18 @@ const RAW_STATICS: &[&[u16]] = &[
     utf16!("toPrimitive"),
     utf16!("get description"),
     // Map object
-    utf16!("Map"),
     utf16!("clear"),
     utf16!("delete"),
     utf16!("has"),
     utf16!("size"),
     // Set object
-    utf16!("Set"),
     utf16!("add"),
     // Reflect object
-    utf16!("Reflect"),
     // Proxy object
-    utf16!("Proxy"),
     utf16!("revocable"),
     // Error objects
-    utf16!("Error"),
-    utf16!("AggregateError"),
-    utf16!("TypeError"),
-    utf16!("RangeError"),
-    utf16!("SyntaxError"),
-    utf16!("ReferenceError"),
-    utf16!("EvalError"),
-    utf16!("ThrowTypeError"),
-    utf16!("URIError"),
     utf16!("message"),
     // Date object
-    utf16!("Date"),
     utf16!("toJSON"),
     utf16!("getDate"),
     utf16!("getDay"),
@@ -394,7 +512,6 @@ const RAW_STATICS: &[&[u16]] = &[
     utf16!("now"),
     utf16!("UTC"),
     // JSON object
-    utf16!("JSON"),
     utf16!("parse"),
     utf16!("stringify"),
     // Iterator object
@@ -404,7 +521,6 @@ const RAW_STATICS: &[&[u16]] = &[
     utf16!("Map Iterator"),
     utf16!("For In Iterator"),
     // Math object
-    utf16!("Math"),
     utf16!("LN10"),
     utf16!("LN2"),
     utf16!("LOG10E"),
@@ -447,22 +563,7 @@ const RAW_STATICS: &[&[u16]] = &[
     utf16!("tan"),
     utf16!("tanh"),
     utf16!("trunc"),
-    // Intl object
-    utf16!("Intl"),
-    utf16!("DateTimeFormat"),
     // TypedArray object
-    utf16!("TypedArray"),
-    utf16!("ArrayBuffer"),
-    utf16!("Int8Array"),
-    utf16!("Uint8Array"),
-    utf16!("Int16Array"),
-    utf16!("Uint16Array"),
-    utf16!("Int32Array"),
-    utf16!("Uint32Array"),
-    utf16!("BigInt64Array"),
-    utf16!("BigUint64Array"),
-    utf16!("Float32Array"),
-    utf16!("Float64Array"),
     utf16!("buffer"),
     utf16!("byteLength"),
     utf16!("byteOffset"),
@@ -474,7 +575,6 @@ const RAW_STATICS: &[&[u16]] = &[
     utf16!("get size"),
     utf16!("get length"),
     // DataView object
-    utf16!("DataView"),
     utf16!("getBigInt64"),
     utf16!("getBigUint64"),
     utf16!("getFloat32"),
@@ -569,31 +669,4 @@ const RAW_STATICS: &[&[u16]] = &[
     utf16!("Z"),
     utf16!("_"),
     utf16!("$"),
-    // Well known symbols
-    utf16!("Symbol.asyncIterator"),
-    utf16!("[Symbol.asyncIterator]"),
-    utf16!("Symbol.hasInstance"),
-    utf16!("[Symbol.hasInstance]"),
-    utf16!("Symbol.isConcatSpreadable"),
-    utf16!("[Symbol.isConcatSpreadable]"),
-    utf16!("Symbol.iterator"),
-    utf16!("[Symbol.iterator]"),
-    utf16!("Symbol.match"),
-    utf16!("[Symbol.match]"),
-    utf16!("Symbol.matchAll"),
-    utf16!("[Symbol.matchAll]"),
-    utf16!("Symbol.replace"),
-    utf16!("[Symbol.replace]"),
-    utf16!("Symbol.search"),
-    utf16!("[Symbol.search]"),
-    utf16!("Symbol.species"),
-    utf16!("[Symbol.species]"),
-    utf16!("Symbol.split"),
-    utf16!("[Symbol.split]"),
-    utf16!("Symbol.toPrimitive"),
-    utf16!("[Symbol.toPrimitive]"),
-    utf16!("Symbol.toStringTag"),
-    utf16!("[Symbol.toStringTag]"),
-    utf16!("Symbol.unscopables"),
-    utf16!("[Symbol.unscopables]"),
 ];

boa_engine/src/string/mod.rs

@@ -651,7 +651,7 @@ impl Clone for JsString {
 impl Default for JsString {
     #[inline]
     fn default() -> Self {
-        StaticJsStrings::empty_string()
+        StaticJsStrings::EMPTY_STRING
     }
 }
 

boa_engine/src/symbol.rs

@@ -80,19 +80,19 @@ enum WellKnown {
 impl WellKnown {
     const fn description(self) -> JsString {
         match self {
-            Self::AsyncIterator => StaticJsStrings::symbol_async_iterator(),
-            Self::HasInstance => StaticJsStrings::symbol_has_instance(),
-            Self::IsConcatSpreadable => StaticJsStrings::symbol_is_concat_spreadable(),
-            Self::Iterator => StaticJsStrings::symbol_iterator(),
-            Self::Match => StaticJsStrings::symbol_match(),
-            Self::MatchAll => StaticJsStrings::symbol_match_all(),
-            Self::Replace => StaticJsStrings::symbol_replace(),
-            Self::Search => StaticJsStrings::symbol_search(),
-            Self::Species => StaticJsStrings::symbol_species(),
-            Self::Split => StaticJsStrings::symbol_split(),
-            Self::ToPrimitive => StaticJsStrings::symbol_to_primitive(),
-            Self::ToStringTag => StaticJsStrings::symbol_to_string_tag(),
-            Self::Unscopables => StaticJsStrings::symbol_unscopables(),
+            Self::AsyncIterator => StaticJsStrings::SYMBOL_ASYNC_ITERATOR,
+            Self::HasInstance => StaticJsStrings::SYMBOL_HAS_INSTANCE,
+            Self::IsConcatSpreadable => StaticJsStrings::SYMBOL_IS_CONCAT_SPREADABLE,
+            Self::Iterator => StaticJsStrings::SYMBOL_ITERATOR,
+            Self::Match => StaticJsStrings::SYMBOL_MATCH,
+            Self::MatchAll => StaticJsStrings::SYMBOL_MATCH_ALL,
+            Self::Replace => StaticJsStrings::SYMBOL_REPLACE,
+            Self::Search => StaticJsStrings::SYMBOL_SEARCH,
+            Self::Species => StaticJsStrings::SYMBOL_SPECIES,
+            Self::Split => StaticJsStrings::SYMBOL_SPLIT,
+            Self::ToPrimitive => StaticJsStrings::SYMBOL_TO_PRIMITIVE,
+            Self::ToStringTag => StaticJsStrings::SYMBOL_TO_STRING_TAG,
+            Self::Unscopables => StaticJsStrings::SYMBOL_UNSCOPABLES,
         }
     }