diff --git a/tsconfig.json b/tsconfig.json
index cfdd2d9e3b..e5fe6fc61b 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -13,8 +13,9 @@
       "outDir": "./bin",
       "baseUrl": ".",
       // "strict": true,
-      // "strictNullChecks": true,
+      "strictNullChecks": true,
       "noImplicitAny": true,
+      "noImplicitThis": true,
       "noUnusedLocals": true,
       "noUnusedParameters": true,
       "noImplicitReturns": true,
diff --git a/types/fineui.d.ts b/types/globals.d.ts
similarity index 77%
rename from types/fineui.d.ts
rename to types/globals.d.ts
index 0b7c597e47..f35336db42 100644
--- a/types/fineui.d.ts
+++ b/types/globals.d.ts
@@ -2,7 +2,7 @@ interface Obj {
     [key: string]: any;
 }
 
-declare let BI: Obj & import("../typescript/index")._BI;
+declare let BI: Obj & import("../typescript/index").BI;
 
 // declare let BI: Obj;
 
diff --git a/typescript/bundle.ts b/typescript/bundle.ts
new file mode 100644
index 0000000000..61cffc88ac
--- /dev/null
+++ b/typescript/bundle.ts
@@ -0,0 +1,3 @@
+import fineui from "./index";
+
+BI.extend(BI, fineui);
diff --git a/typescript/core/decorator/decorator.ts b/typescript/core/decorator/decorator.ts
index d7e7e664f5..f00024e18e 100644
--- a/typescript/core/decorator/decorator.ts
+++ b/typescript/core/decorator/decorator.ts
@@ -83,4 +83,4 @@ type UnionToTupleRecursively_<Union, Element, Result extends ReadonlyArray<any>>
     UnionToTupleRecursively<Exclude<Union, Element>, Prepend<Element, Result>>;
 
 type UnionToTuple<U> = UnionToTupleRecursively<U, []>;
-*/
\ No newline at end of file
+*/
diff --git a/typescript/index.ts b/typescript/index.ts
index 16dfae4411..5e66099839 100644
--- a/typescript/index.ts
+++ b/typescript/index.ts
@@ -22,7 +22,7 @@ type ClassConstructor<T extends {}> = T & {
     readonly prototype: T;
 }
 
-export interface _BI extends _func, _i18n, _base {
+export interface BI extends _func, _i18n, _base {
     OB: ClassConstructor<_OB>;
     Widget: ClassConstructor<_Widget> & _WidgetStatic;
     Single: ClassConstructor<_Single>;
@@ -40,6 +40,6 @@ export interface _BI extends _func, _i18n, _base {
     Decorators: typeof decorator;
 }
 
-BI = BI.extend(BI, {
+export default {
     Decorators: decorator,
-}) as any;
+};
diff --git a/webpack/webpack.common.js b/webpack/webpack.common.js
index ba70b55730..525f8d7a42 100644
--- a/webpack/webpack.common.js
+++ b/webpack/webpack.common.js
@@ -26,7 +26,7 @@ module.exports = {
                 "es6-promise/auto",
             ],
         fineui: [
-            "./typescript/index.ts",
+            "./typescript/bundle.ts",
         ],
     },
     resolve: {