diff --git a/tests/baselines/reference/collisionExportsRequireAndAmbientClass.js b/tests/baselines/reference/collisionExportsRequireAndAmbientClass.js
new file mode 100644
index 00000000000..9f4106616a8
--- /dev/null
+++ b/tests/baselines/reference/collisionExportsRequireAndAmbientClass.js
@@ -0,0 +1,50 @@
+//// [tests/cases/compiler/collisionExportsRequireAndAmbientClass.ts] ////
+
+//// [collisionExportsRequireAndAmbientClass_externalmodule.ts]
+export declare class require {
+}
+export declare class exports {
+}
+declare module m1 {
+    class require {
+    }
+    class exports {
+    }
+}
+module m2 {
+    export declare class require {
+    }
+    export declare class exports {
+    }
+}
+
+//// [collisionExportsRequireAndAmbientClass_globalFile.ts]
+declare class require {
+}
+declare class exports {
+}
+declare module m3 {
+    class require {
+    }
+    class exports {
+    }
+}
+module m4 {
+    export declare class require {
+    }
+    export declare class exports {
+    }
+    var a = 10;
+}
+
+//// [collisionExportsRequireAndAmbientClass_externalmodule.js]
+define(["require", "exports"], function (require, exports) {
+    var m2;
+    (function (m2) {
+    })(m2 || (m2 = {}));
+});
+//// [collisionExportsRequireAndAmbientClass_globalFile.js]
+var m4;
+(function (m4) {
+    var a = 10;
+})(m4 || (m4 = {}));
diff --git a/tests/baselines/reference/collisionExportsRequireAndAmbientClass.types b/tests/baselines/reference/collisionExportsRequireAndAmbientClass.types
new file mode 100644
index 00000000000..8212c6ffc61
--- /dev/null
+++ b/tests/baselines/reference/collisionExportsRequireAndAmbientClass.types
@@ -0,0 +1,57 @@
+=== tests/cases/compiler/collisionExportsRequireAndAmbientClass_externalmodule.ts ===
+export declare class require {
+>require : require
+}
+export declare class exports {
+>exports : exports
+}
+declare module m1 {
+>m1 : typeof m1
+
+    class require {
+>require : require
+    }
+    class exports {
+>exports : exports
+    }
+}
+module m2 {
+>m2 : typeof m2
+
+    export declare class require {
+>require : require
+    }
+    export declare class exports {
+>exports : exports
+    }
+}
+
+=== tests/cases/compiler/collisionExportsRequireAndAmbientClass_globalFile.ts ===
+declare class require {
+>require : require
+}
+declare class exports {
+>exports : exports
+}
+declare module m3 {
+>m3 : typeof m3
+
+    class require {
+>require : require
+    }
+    class exports {
+>exports : exports
+    }
+}
+module m4 {
+>m4 : typeof m4
+
+    export declare class require {
+>require : require
+    }
+    export declare class exports {
+>exports : exports
+    }
+    var a = 10;
+>a : number
+}
diff --git a/tests/baselines/reference/collisionExportsRequireAndAmbientEnum.js b/tests/baselines/reference/collisionExportsRequireAndAmbientEnum.js
new file mode 100644
index 00000000000..829f93e4fa7
--- /dev/null
+++ b/tests/baselines/reference/collisionExportsRequireAndAmbientEnum.js
@@ -0,0 +1,72 @@
+//// [tests/cases/compiler/collisionExportsRequireAndAmbientEnum.ts] ////
+
+//// [collisionExportsRequireAndAmbientEnum_externalmodule.ts]
+export declare enum require {
+    _thisVal1,
+    _thisVal2,
+}
+export declare enum exports {
+    _thisVal1,
+    _thisVal2,
+}
+declare module m1 {
+    enum require {
+        _thisVal1,
+        _thisVal2,
+    }
+    enum exports {
+        _thisVal1,
+        _thisVal2,
+    }
+}
+module m2 {
+    export declare enum require { 
+        _thisVal1,
+        _thisVal2,
+    }
+    export declare enum exports {
+        _thisVal1,
+        _thisVal2,
+    }
+}
+
+//// [collisionExportsRequireAndAmbientEnum_globalFile.ts]
+declare enum require {
+    _thisVal1,
+    _thisVal2,
+}
+declare enum exports {
+    _thisVal1,
+    _thisVal2,
+}
+declare module m3 {
+    enum require {
+        _thisVal1,
+        _thisVal2,
+    }
+    enum exports {
+        _thisVal1,
+        _thisVal2,
+    }
+}
+module m4 {
+    export declare enum require {
+        _thisVal1,
+        _thisVal2,
+    }
+    export declare enum exports {
+        _thisVal1,
+        _thisVal2,
+    }
+}
+
+//// [collisionExportsRequireAndAmbientEnum_externalmodule.js]
+define(["require", "exports"], function (require, exports) {
+    var m2;
+    (function (m2) {
+    })(m2 || (m2 = {}));
+});
+//// [collisionExportsRequireAndAmbientEnum_globalFile.js]
+var m4;
+(function (m4) {
+})(m4 || (m4 = {}));
diff --git a/tests/baselines/reference/collisionExportsRequireAndAmbientEnum.types b/tests/baselines/reference/collisionExportsRequireAndAmbientEnum.types
new file mode 100644
index 00000000000..3bc7a00063b
--- /dev/null
+++ b/tests/baselines/reference/collisionExportsRequireAndAmbientEnum.types
@@ -0,0 +1,127 @@
+=== tests/cases/compiler/collisionExportsRequireAndAmbientEnum_externalmodule.ts ===
+export declare enum require {
+>require : require
+
+    _thisVal1,
+>_thisVal1 : require
+
+    _thisVal2,
+>_thisVal2 : require
+}
+export declare enum exports {
+>exports : exports
+
+    _thisVal1,
+>_thisVal1 : exports
+
+    _thisVal2,
+>_thisVal2 : exports
+}
+declare module m1 {
+>m1 : typeof m1
+
+    enum require {
+>require : require
+
+        _thisVal1,
+>_thisVal1 : require
+
+        _thisVal2,
+>_thisVal2 : require
+    }
+    enum exports {
+>exports : exports
+
+        _thisVal1,
+>_thisVal1 : exports
+
+        _thisVal2,
+>_thisVal2 : exports
+    }
+}
+module m2 {
+>m2 : typeof m2
+
+    export declare enum require { 
+>require : require
+
+        _thisVal1,
+>_thisVal1 : require
+
+        _thisVal2,
+>_thisVal2 : require
+    }
+    export declare enum exports {
+>exports : exports
+
+        _thisVal1,
+>_thisVal1 : exports
+
+        _thisVal2,
+>_thisVal2 : exports
+    }
+}
+
+=== tests/cases/compiler/collisionExportsRequireAndAmbientEnum_globalFile.ts ===
+declare enum require {
+>require : require
+
+    _thisVal1,
+>_thisVal1 : require
+
+    _thisVal2,
+>_thisVal2 : require
+}
+declare enum exports {
+>exports : exports
+
+    _thisVal1,
+>_thisVal1 : exports
+
+    _thisVal2,
+>_thisVal2 : exports
+}
+declare module m3 {
+>m3 : typeof m3
+
+    enum require {
+>require : require
+
+        _thisVal1,
+>_thisVal1 : require
+
+        _thisVal2,
+>_thisVal2 : require
+    }
+    enum exports {
+>exports : exports
+
+        _thisVal1,
+>_thisVal1 : exports
+
+        _thisVal2,
+>_thisVal2 : exports
+    }
+}
+module m4 {
+>m4 : typeof m4
+
+    export declare enum require {
+>require : require
+
+        _thisVal1,
+>_thisVal1 : require
+
+        _thisVal2,
+>_thisVal2 : require
+    }
+    export declare enum exports {
+>exports : exports
+
+        _thisVal1,
+>_thisVal1 : exports
+
+        _thisVal2,
+>_thisVal2 : exports
+    }
+}
diff --git a/tests/baselines/reference/collisionExportsRequireAndAmbientFunction.js b/tests/baselines/reference/collisionExportsRequireAndAmbientFunction.js
new file mode 100644
index 00000000000..c1fb0ce163a
--- /dev/null
+++ b/tests/baselines/reference/collisionExportsRequireAndAmbientFunction.js
@@ -0,0 +1,22 @@
+//// [collisionExportsRequireAndAmbientFunction.ts]
+export declare function exports(): number;
+
+export declare function require(): string[];
+    
+declare module m1 {
+    function exports(): string;
+    function require(): number;
+}
+module m2 {
+    export declare function exports(): string;
+    export declare function require(): string[];
+    var a = 10;
+}
+
+//// [collisionExportsRequireAndAmbientFunction.js]
+define(["require", "exports"], function (require, exports) {
+    var m2;
+    (function (m2) {
+        var a = 10;
+    })(m2 || (m2 = {}));
+});
diff --git a/tests/baselines/reference/collisionExportsRequireAndAmbientFunction.types b/tests/baselines/reference/collisionExportsRequireAndAmbientFunction.types
new file mode 100644
index 00000000000..024bdff8ea3
--- /dev/null
+++ b/tests/baselines/reference/collisionExportsRequireAndAmbientFunction.types
@@ -0,0 +1,28 @@
+=== tests/cases/compiler/collisionExportsRequireAndAmbientFunction.ts ===
+export declare function exports(): number;
+>exports : () => number
+
+export declare function require(): string[];
+>require : () => string[]
+    
+declare module m1 {
+>m1 : typeof m1
+
+    function exports(): string;
+>exports : () => string
+
+    function require(): number;
+>require : () => number
+}
+module m2 {
+>m2 : typeof m2
+
+    export declare function exports(): string;
+>exports : () => string
+
+    export declare function require(): string[];
+>require : () => string[]
+
+    var a = 10;
+>a : number
+}
diff --git a/tests/baselines/reference/collisionExportsRequireAndAmbientFunctionInGlobalFile.js b/tests/baselines/reference/collisionExportsRequireAndAmbientFunctionInGlobalFile.js
new file mode 100644
index 00000000000..44294f51cb5
--- /dev/null
+++ b/tests/baselines/reference/collisionExportsRequireAndAmbientFunctionInGlobalFile.js
@@ -0,0 +1,18 @@
+//// [collisionExportsRequireAndAmbientFunctionInGlobalFile.ts]
+declare function exports(): number;
+declare function require(): string;
+declare module m3 {
+    function exports(): string[];
+    function require(): number[];
+}
+module m4 {
+    export declare function exports(): string;
+    export declare function require(): string;
+    var a = 10;
+}
+
+//// [collisionExportsRequireAndAmbientFunctionInGlobalFile.js]
+var m4;
+(function (m4) {
+    var a = 10;
+})(m4 || (m4 = {}));
diff --git a/tests/baselines/reference/collisionExportsRequireAndAmbientFunctionInGlobalFile.types b/tests/baselines/reference/collisionExportsRequireAndAmbientFunctionInGlobalFile.types
new file mode 100644
index 00000000000..0ecde7f429f
--- /dev/null
+++ b/tests/baselines/reference/collisionExportsRequireAndAmbientFunctionInGlobalFile.types
@@ -0,0 +1,28 @@
+=== tests/cases/compiler/collisionExportsRequireAndAmbientFunctionInGlobalFile.ts ===
+declare function exports(): number;
+>exports : () => number
+
+declare function require(): string;
+>require : () => string
+
+declare module m3 {
+>m3 : typeof m3
+
+    function exports(): string[];
+>exports : () => string[]
+
+    function require(): number[];
+>require : () => number[]
+}
+module m4 {
+>m4 : typeof m4
+
+    export declare function exports(): string;
+>exports : () => string
+
+    export declare function require(): string;
+>require : () => string
+
+    var a = 10;
+>a : number
+}
diff --git a/tests/baselines/reference/collisionExportsRequireAndAmbientModule.js b/tests/baselines/reference/collisionExportsRequireAndAmbientModule.js
new file mode 100644
index 00000000000..4979e9e50ca
--- /dev/null
+++ b/tests/baselines/reference/collisionExportsRequireAndAmbientModule.js
@@ -0,0 +1,116 @@
+//// [tests/cases/compiler/collisionExportsRequireAndAmbientModule.ts] ////
+
+//// [collisionExportsRequireAndAmbientModule_externalmodule.ts]
+export declare module require {
+    export interface I {
+    }
+    export class C {
+    }
+}
+export function foo(): require.I {
+    return null;
+}
+export declare module exports {
+    export interface I {
+    }
+    export class C {
+    }
+}
+export function foo2(): exports.I {
+    return null;
+}
+declare module m1 {
+    module require {
+        export interface I {
+        }
+        export class C {
+        }
+    }
+    module exports {
+        export interface I {
+        }
+        export class C {
+        }
+    }
+}
+module m2 {
+    export declare module require {
+        export interface I {
+        }
+        export class C {
+        }
+    }
+    export declare module exports {
+        export interface I {
+        }
+        export class C {
+        }
+    }
+    var a = 10;
+}
+
+//// [collisionExportsRequireAndAmbientModule_globalFile.ts]
+declare module require {
+    export interface I {
+    }
+    export class C {
+    }
+}
+declare module exports {
+    export interface I {
+    }
+    export class C {
+    }
+}
+declare module m3 {
+    module require {
+        export interface I {
+        }
+        export class C {
+        }
+    }
+    module exports {
+        export interface I {
+        }
+        export class C {
+        }
+    }
+}
+module m4 {
+    export declare module require {
+        export interface I {
+        }
+        export class C {
+        }
+    }
+    export declare module exports {
+        export interface I {
+        }
+        export class C {
+        }
+    }
+
+    var a = 10;
+}
+
+
+//// [collisionExportsRequireAndAmbientModule_externalmodule.js]
+define(["require", "exports"], function (require, exports) {
+    function foo() {
+        return null;
+    }
+    exports.foo = foo;
+    function foo2() {
+        return null;
+    }
+    exports.foo2 = foo2;
+    var m2;
+    (function (m2) {
+        var a = 10;
+    })(m2 || (m2 = {}));
+});
+//// [collisionExportsRequireAndAmbientModule_globalFile.js]
+var m4;
+(function (m4) {
+    var a = 10;
+})(m4 || (m4 = {}));
diff --git a/tests/baselines/reference/collisionExportsRequireAndAmbientModule.types b/tests/baselines/reference/collisionExportsRequireAndAmbientModule.types
new file mode 100644
index 00000000000..7e41093daaa
--- /dev/null
+++ b/tests/baselines/reference/collisionExportsRequireAndAmbientModule.types
@@ -0,0 +1,159 @@
+=== tests/cases/compiler/collisionExportsRequireAndAmbientModule_externalmodule.ts ===
+export declare module require {
+>require : typeof require
+
+    export interface I {
+>I : I
+    }
+    export class C {
+>C : C
+    }
+}
+export function foo(): require.I {
+>foo : () => require.I
+>require : unknown
+>I : require.I
+
+    return null;
+}
+export declare module exports {
+>exports : typeof exports
+
+    export interface I {
+>I : I
+    }
+    export class C {
+>C : C
+    }
+}
+export function foo2(): exports.I {
+>foo2 : () => exports.I
+>exports : unknown
+>I : exports.I
+
+    return null;
+}
+declare module m1 {
+>m1 : typeof m1
+
+    module require {
+>require : typeof require
+
+        export interface I {
+>I : I
+        }
+        export class C {
+>C : C
+        }
+    }
+    module exports {
+>exports : typeof exports
+
+        export interface I {
+>I : I
+        }
+        export class C {
+>C : C
+        }
+    }
+}
+module m2 {
+>m2 : typeof m2
+
+    export declare module require {
+>require : typeof require
+
+        export interface I {
+>I : I
+        }
+        export class C {
+>C : C
+        }
+    }
+    export declare module exports {
+>exports : typeof exports
+
+        export interface I {
+>I : I
+        }
+        export class C {
+>C : C
+        }
+    }
+    var a = 10;
+>a : number
+}
+
+=== tests/cases/compiler/collisionExportsRequireAndAmbientModule_globalFile.ts ===
+declare module require {
+>require : typeof require
+
+    export interface I {
+>I : I
+    }
+    export class C {
+>C : C
+    }
+}
+declare module exports {
+>exports : typeof exports
+
+    export interface I {
+>I : I
+    }
+    export class C {
+>C : C
+    }
+}
+declare module m3 {
+>m3 : typeof m3
+
+    module require {
+>require : typeof require
+
+        export interface I {
+>I : I
+        }
+        export class C {
+>C : C
+        }
+    }
+    module exports {
+>exports : typeof exports
+
+        export interface I {
+>I : I
+        }
+        export class C {
+>C : C
+        }
+    }
+}
+module m4 {
+>m4 : typeof m4
+
+    export declare module require {
+>require : typeof require
+
+        export interface I {
+>I : I
+        }
+        export class C {
+>C : C
+        }
+    }
+    export declare module exports {
+>exports : typeof exports
+
+        export interface I {
+>I : I
+        }
+        export class C {
+>C : C
+        }
+    }
+
+    var a = 10;
+>a : number
+}
+
diff --git a/tests/baselines/reference/collisionExportsRequireAndAmbientVar.js b/tests/baselines/reference/collisionExportsRequireAndAmbientVar.js
new file mode 100644
index 00000000000..7a552251b15
--- /dev/null
+++ b/tests/baselines/reference/collisionExportsRequireAndAmbientVar.js
@@ -0,0 +1,40 @@
+//// [tests/cases/compiler/collisionExportsRequireAndAmbientVar.ts] ////
+
+//// [collisionExportsRequireAndAmbientVar_externalmodule.ts]
+export declare var exports: number;
+export declare var require: string;
+declare module m1 {
+    var exports: string;
+    var require: number;
+}
+module m2 {
+    export declare var exports: number;
+    export declare var require: string;
+    var a = 10;
+}
+
+//// [collisionExportsRequireAndAmbientVar_globalFile.ts]
+declare var exports: number;
+declare var require: string;
+declare module m3 {
+    var exports: string;
+    var require: number;
+}
+module m4 {
+    export declare var exports: string;
+    export declare var require: number;
+    var a = 10;
+}
+
+//// [collisionExportsRequireAndAmbientVar_externalmodule.js]
+define(["require", "exports"], function (require, exports) {
+    var m2;
+    (function (m2) {
+        var a = 10;
+    })(m2 || (m2 = {}));
+});
+//// [collisionExportsRequireAndAmbientVar_globalFile.js]
+var m4;
+(function (m4) {
+    var a = 10;
+})(m4 || (m4 = {}));
diff --git a/tests/baselines/reference/collisionExportsRequireAndAmbientVar.types b/tests/baselines/reference/collisionExportsRequireAndAmbientVar.types
new file mode 100644
index 00000000000..1419df3504b
--- /dev/null
+++ b/tests/baselines/reference/collisionExportsRequireAndAmbientVar.types
@@ -0,0 +1,57 @@
+=== tests/cases/compiler/collisionExportsRequireAndAmbientVar_externalmodule.ts ===
+export declare var exports: number;
+>exports : number
+
+export declare var require: string;
+>require : string
+
+declare module m1 {
+>m1 : typeof m1
+
+    var exports: string;
+>exports : string
+
+    var require: number;
+>require : number
+}
+module m2 {
+>m2 : typeof m2
+
+    export declare var exports: number;
+>exports : number
+
+    export declare var require: string;
+>require : string
+
+    var a = 10;
+>a : number
+}
+
+=== tests/cases/compiler/collisionExportsRequireAndAmbientVar_globalFile.ts ===
+declare var exports: number;
+>exports : number
+
+declare var require: string;
+>require : string
+
+declare module m3 {
+>m3 : typeof m3
+
+    var exports: string;
+>exports : string
+
+    var require: number;
+>require : number
+}
+module m4 {
+>m4 : typeof m4
+
+    export declare var exports: string;
+>exports : string
+
+    export declare var require: number;
+>require : number
+
+    var a = 10;
+>a : number
+}
diff --git a/tests/baselines/reference/collisionExportsRequireAndClass.errors.txt b/tests/baselines/reference/collisionExportsRequireAndClass.errors.txt
index 9b90ab50c11..8fea5b475f2 100644
--- a/tests/baselines/reference/collisionExportsRequireAndClass.errors.txt
+++ b/tests/baselines/reference/collisionExportsRequireAndClass.errors.txt
@@ -1,4 +1,4 @@
-==== tests/cases/compiler/collisionExportsRequireAndClass.ts (2 errors) ====
+==== tests/cases/compiler/collisionExportsRequireAndClass_externalmodule.ts (2 errors) ====
     export class require {
                  ~~~~~~~
 !!! Duplicate identifier 'require'. Compiler reserves name 'require' in top level scope of an external module.
@@ -7,4 +7,33 @@
                  ~~~~~~~
 !!! Duplicate identifier 'exports'. Compiler reserves name 'exports' in top level scope of an external module.
     }
-    
\ No newline at end of file
+    module m1 {
+        class require {
+        }
+        class exports {
+        }
+    }
+    module m2 {
+        export class require {
+        }
+        export class exports {
+        }
+    }
+    
+==== tests/cases/compiler/collisionExportsRequireAndClass_globalFile.ts (0 errors) ====
+    class require {
+    }
+    class exports {
+    }
+    module m3 {
+        class require {
+        }
+        class exports {
+        }
+    }
+    module m4 {
+        export class require {
+        }
+        export class exports {
+        }
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/collisionExportsRequireAndClass.js b/tests/baselines/reference/collisionExportsRequireAndClass.js
index 7ec2975f918..f337d9a0a35 100644
--- a/tests/baselines/reference/collisionExportsRequireAndClass.js
+++ b/tests/baselines/reference/collisionExportsRequireAndClass.js
@@ -1,11 +1,42 @@
-//// [collisionExportsRequireAndClass.ts]
+//// [tests/cases/compiler/collisionExportsRequireAndClass.ts] ////
+
+//// [collisionExportsRequireAndClass_externalmodule.ts]
 export class require {
 }
 export class exports {
 }
+module m1 {
+    class require {
+    }
+    class exports {
+    }
+}
+module m2 {
+    export class require {
+    }
+    export class exports {
+    }
+}
 
+//// [collisionExportsRequireAndClass_globalFile.ts]
+class require {
+}
+class exports {
+}
+module m3 {
+    class require {
+    }
+    class exports {
+    }
+}
+module m4 {
+    export class require {
+    }
+    export class exports {
+    }
+}
 
-//// [collisionExportsRequireAndClass.js]
+//// [collisionExportsRequireAndClass_externalmodule.js]
 define(["require", "exports"], function (require, exports) {
     var require = (function () {
         function require() {
@@ -19,4 +50,71 @@ define(["require", "exports"], function (require, exports) {
         return exports;
     })();
     exports.exports = exports;
+    var m1;
+    (function (m1) {
+        var require = (function () {
+            function require() {
+            }
+            return require;
+        })();
+        var exports = (function () {
+            function exports() {
+            }
+            return exports;
+        })();
+    })(m1 || (m1 = {}));
+    var m2;
+    (function (m2) {
+        var require = (function () {
+            function require() {
+            }
+            return require;
+        })();
+        m2.require = require;
+        var exports = (function () {
+            function exports() {
+            }
+            return exports;
+        })();
+        m2.exports = exports;
+    })(m2 || (m2 = {}));
 });
+//// [collisionExportsRequireAndClass_globalFile.js]
+var require = (function () {
+    function require() {
+    }
+    return require;
+})();
+var exports = (function () {
+    function exports() {
+    }
+    return exports;
+})();
+var m3;
+(function (m3) {
+    var require = (function () {
+        function require() {
+        }
+        return require;
+    })();
+    var exports = (function () {
+        function exports() {
+        }
+        return exports;
+    })();
+})(m3 || (m3 = {}));
+var m4;
+(function (m4) {
+    var require = (function () {
+        function require() {
+        }
+        return require;
+    })();
+    m4.require = require;
+    var exports = (function () {
+        function exports() {
+        }
+        return exports;
+    })();
+    m4.exports = exports;
+})(m4 || (m4 = {}));
diff --git a/tests/baselines/reference/collisionExportsRequireAndEnum.errors.txt b/tests/baselines/reference/collisionExportsRequireAndEnum.errors.txt
index 0ecd5edef83..782e4958363 100644
--- a/tests/baselines/reference/collisionExportsRequireAndEnum.errors.txt
+++ b/tests/baselines/reference/collisionExportsRequireAndEnum.errors.txt
@@ -1,4 +1,4 @@
-==== tests/cases/compiler/collisionExportsRequireAndEnum.ts (2 errors) ====
+==== tests/cases/compiler/collisionExportsRequireAndEnum_externalmodule.ts (2 errors) ====
     export enum require { // Error
                 ~~~~~~~
 !!! Duplicate identifier 'require'. Compiler reserves name 'require' in top level scope of an external module.
@@ -10,4 +10,54 @@
 !!! Duplicate identifier 'exports'. Compiler reserves name 'exports' in top level scope of an external module.
         _thisVal1,
         _thisVal2,
+    }
+    module m1 {
+        enum require {
+            _thisVal1,
+            _thisVal2,
+        }
+        enum exports {
+            _thisVal1,
+            _thisVal2,
+        }
+    }
+    module m2 {
+        export enum require { 
+            _thisVal1,
+            _thisVal2,
+        }
+        export enum exports {
+            _thisVal1,
+            _thisVal2,
+        }
+    }
+    
+==== tests/cases/compiler/collisionExportsRequireAndEnum_globalFile.ts (0 errors) ====
+    enum require {
+        _thisVal1,
+        _thisVal2,
+    }
+    enum exports {
+        _thisVal1,
+        _thisVal2,
+    }
+    module m3 {
+        enum require {
+            _thisVal1,
+            _thisVal2,
+        }
+        enum exports {
+            _thisVal1,
+            _thisVal2,
+        }
+    }
+    module m4 {
+        export enum require {
+            _thisVal1,
+            _thisVal2,
+        }
+        export enum exports {
+            _thisVal1,
+            _thisVal2,
+        }
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/collisionExportsRequireAndEnum.js b/tests/baselines/reference/collisionExportsRequireAndEnum.js
index f495b534805..be63fa32851 100644
--- a/tests/baselines/reference/collisionExportsRequireAndEnum.js
+++ b/tests/baselines/reference/collisionExportsRequireAndEnum.js
@@ -1,4 +1,6 @@
-//// [collisionExportsRequireAndEnum.ts]
+//// [tests/cases/compiler/collisionExportsRequireAndEnum.ts] ////
+
+//// [collisionExportsRequireAndEnum_externalmodule.ts]
 export enum require { // Error
     _thisVal1,
     _thisVal2,
@@ -6,9 +8,59 @@ export enum require { // Error
 export enum exports { // Error
     _thisVal1,
     _thisVal2,
+}
+module m1 {
+    enum require {
+        _thisVal1,
+        _thisVal2,
+    }
+    enum exports {
+        _thisVal1,
+        _thisVal2,
+    }
+}
+module m2 {
+    export enum require { 
+        _thisVal1,
+        _thisVal2,
+    }
+    export enum exports {
+        _thisVal1,
+        _thisVal2,
+    }
+}
+
+//// [collisionExportsRequireAndEnum_globalFile.ts]
+enum require {
+    _thisVal1,
+    _thisVal2,
+}
+enum exports {
+    _thisVal1,
+    _thisVal2,
+}
+module m3 {
+    enum require {
+        _thisVal1,
+        _thisVal2,
+    }
+    enum exports {
+        _thisVal1,
+        _thisVal2,
+    }
+}
+module m4 {
+    export enum require {
+        _thisVal1,
+        _thisVal2,
+    }
+    export enum exports {
+        _thisVal1,
+        _thisVal2,
+    }
 }
 
-//// [collisionExportsRequireAndEnum.js]
+//// [collisionExportsRequireAndEnum_externalmodule.js]
 define(["require", "exports"], function (require, exports) {
     (function (require) {
         require[require["_thisVal1"] = 0] = "_thisVal1";
@@ -20,4 +72,67 @@ define(["require", "exports"], function (require, exports) {
         exports[exports["_thisVal2"] = 1] = "_thisVal2";
     })(exports.exports || (exports.exports = {}));
     var exports = exports.exports;
+    var m1;
+    (function (m1) {
+        var require;
+        (function (require) {
+            require[require["_thisVal1"] = 0] = "_thisVal1";
+            require[require["_thisVal2"] = 1] = "_thisVal2";
+        })(require || (require = {}));
+        var exports;
+        (function (exports) {
+            exports[exports["_thisVal1"] = 0] = "_thisVal1";
+            exports[exports["_thisVal2"] = 1] = "_thisVal2";
+        })(exports || (exports = {}));
+    })(m1 || (m1 = {}));
+    var m2;
+    (function (m2) {
+        (function (require) {
+            require[require["_thisVal1"] = 0] = "_thisVal1";
+            require[require["_thisVal2"] = 1] = "_thisVal2";
+        })(m2.require || (m2.require = {}));
+        var require = m2.require;
+        (function (exports) {
+            exports[exports["_thisVal1"] = 0] = "_thisVal1";
+            exports[exports["_thisVal2"] = 1] = "_thisVal2";
+        })(m2.exports || (m2.exports = {}));
+        var exports = m2.exports;
+    })(m2 || (m2 = {}));
 });
+//// [collisionExportsRequireAndEnum_globalFile.js]
+var require;
+(function (require) {
+    require[require["_thisVal1"] = 0] = "_thisVal1";
+    require[require["_thisVal2"] = 1] = "_thisVal2";
+})(require || (require = {}));
+var exports;
+(function (exports) {
+    exports[exports["_thisVal1"] = 0] = "_thisVal1";
+    exports[exports["_thisVal2"] = 1] = "_thisVal2";
+})(exports || (exports = {}));
+var m3;
+(function (m3) {
+    var require;
+    (function (require) {
+        require[require["_thisVal1"] = 0] = "_thisVal1";
+        require[require["_thisVal2"] = 1] = "_thisVal2";
+    })(require || (require = {}));
+    var exports;
+    (function (exports) {
+        exports[exports["_thisVal1"] = 0] = "_thisVal1";
+        exports[exports["_thisVal2"] = 1] = "_thisVal2";
+    })(exports || (exports = {}));
+})(m3 || (m3 = {}));
+var m4;
+(function (m4) {
+    (function (require) {
+        require[require["_thisVal1"] = 0] = "_thisVal1";
+        require[require["_thisVal2"] = 1] = "_thisVal2";
+    })(m4.require || (m4.require = {}));
+    var require = m4.require;
+    (function (exports) {
+        exports[exports["_thisVal1"] = 0] = "_thisVal1";
+        exports[exports["_thisVal2"] = 1] = "_thisVal2";
+    })(m4.exports || (m4.exports = {}));
+    var exports = m4.exports;
+})(m4 || (m4 = {}));
diff --git a/tests/baselines/reference/collisionExportsRequireAndFunction.errors.txt b/tests/baselines/reference/collisionExportsRequireAndFunction.errors.txt
index bf35c4ce334..49c6355c480 100644
--- a/tests/baselines/reference/collisionExportsRequireAndFunction.errors.txt
+++ b/tests/baselines/reference/collisionExportsRequireAndFunction.errors.txt
@@ -9,4 +9,19 @@
 !!! Duplicate identifier 'require'. Compiler reserves name 'require' in top level scope of an external module.
         return "require";
     }
-    
\ No newline at end of file
+    module m1 {
+        function exports() {
+            return 1;
+        }
+        function require() {
+            return "require";
+        }
+    }
+    module m2 {
+        export function exports() {
+            return 1;
+        }
+        export function require() {
+            return "require";
+        }
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/collisionExportsRequireAndFunction.js b/tests/baselines/reference/collisionExportsRequireAndFunction.js
index a7d4ca2492e..e768609f3c6 100644
--- a/tests/baselines/reference/collisionExportsRequireAndFunction.js
+++ b/tests/baselines/reference/collisionExportsRequireAndFunction.js
@@ -5,7 +5,22 @@ export function exports() {
 export function require() {
     return "require";
 }
-
+module m1 {
+    function exports() {
+        return 1;
+    }
+    function require() {
+        return "require";
+    }
+}
+module m2 {
+    export function exports() {
+        return 1;
+    }
+    export function require() {
+        return "require";
+    }
+}
 
 //// [collisionExportsRequireAndFunction.js]
 define(["require", "exports"], function (require, exports) {
@@ -17,4 +32,24 @@ define(["require", "exports"], function (require, exports) {
         return "require";
     }
     exports.require = require;
+    var m1;
+    (function (m1) {
+        function exports() {
+            return 1;
+        }
+        function require() {
+            return "require";
+        }
+    })(m1 || (m1 = {}));
+    var m2;
+    (function (m2) {
+        function exports() {
+            return 1;
+        }
+        m2.exports = exports;
+        function require() {
+            return "require";
+        }
+        m2.require = require;
+    })(m2 || (m2 = {}));
 });
diff --git a/tests/baselines/reference/collisionExportsRequireAndFunctionInGlobalFile.js b/tests/baselines/reference/collisionExportsRequireAndFunctionInGlobalFile.js
new file mode 100644
index 00000000000..1865d1aceff
--- /dev/null
+++ b/tests/baselines/reference/collisionExportsRequireAndFunctionInGlobalFile.js
@@ -0,0 +1,51 @@
+//// [collisionExportsRequireAndFunctionInGlobalFile.ts]
+function exports() {
+    return 1;
+}
+function require() {
+    return "require";
+}
+module m3 {
+    function exports() {
+        return 1;
+    }
+    function require() {
+        return "require";
+    }
+}
+module m4 {
+    export function exports() {
+        return 1;
+    }
+    export function require() {
+        return "require";
+    }
+}
+
+//// [collisionExportsRequireAndFunctionInGlobalFile.js]
+function exports() {
+    return 1;
+}
+function require() {
+    return "require";
+}
+var m3;
+(function (m3) {
+    function exports() {
+        return 1;
+    }
+    function require() {
+        return "require";
+    }
+})(m3 || (m3 = {}));
+var m4;
+(function (m4) {
+    function exports() {
+        return 1;
+    }
+    m4.exports = exports;
+    function require() {
+        return "require";
+    }
+    m4.require = require;
+})(m4 || (m4 = {}));
diff --git a/tests/baselines/reference/collisionExportsRequireAndFunctionInGlobalFile.types b/tests/baselines/reference/collisionExportsRequireAndFunctionInGlobalFile.types
new file mode 100644
index 00000000000..ba804feb91a
--- /dev/null
+++ b/tests/baselines/reference/collisionExportsRequireAndFunctionInGlobalFile.types
@@ -0,0 +1,39 @@
+=== tests/cases/compiler/collisionExportsRequireAndFunctionInGlobalFile.ts ===
+function exports() {
+>exports : () => number
+
+    return 1;
+}
+function require() {
+>require : () => string
+
+    return "require";
+}
+module m3 {
+>m3 : typeof m3
+
+    function exports() {
+>exports : () => number
+
+        return 1;
+    }
+    function require() {
+>require : () => string
+
+        return "require";
+    }
+}
+module m4 {
+>m4 : typeof m4
+
+    export function exports() {
+>exports : () => number
+
+        return 1;
+    }
+    export function require() {
+>require : () => string
+
+        return "require";
+    }
+}
diff --git a/tests/baselines/reference/collisionExportsRequireAndInternalModuleAlias.errors.txt b/tests/baselines/reference/collisionExportsRequireAndInternalModuleAlias.errors.txt
new file mode 100644
index 00000000000..9facc72da23
--- /dev/null
+++ b/tests/baselines/reference/collisionExportsRequireAndInternalModuleAlias.errors.txt
@@ -0,0 +1,27 @@
+==== tests/cases/compiler/collisionExportsRequireAndInternalModuleAlias.ts (2 errors) ====
+    export module m {
+        export class c {
+        }
+    }
+    import exports = m.c;
+           ~~~~~~~
+!!! Duplicate identifier 'exports'. Compiler reserves name 'exports' in top level scope of an external module.
+    import require = m.c;
+           ~~~~~~~
+!!! Duplicate identifier 'require'. Compiler reserves name 'require' in top level scope of an external module.
+    new exports();
+    new require();
+    
+    module m1 {
+        import exports = m.c;
+        import require = m.c;
+        new exports();
+        new require();
+    }
+    
+    module m2 {
+        export import exports = m.c;
+        export import require = m.c;
+        new exports();
+        new require();
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/collisionExportsRequireAndInternalModuleAlias.js b/tests/baselines/reference/collisionExportsRequireAndInternalModuleAlias.js
new file mode 100644
index 00000000000..a4c2a39c8f5
--- /dev/null
+++ b/tests/baselines/reference/collisionExportsRequireAndInternalModuleAlias.js
@@ -0,0 +1,54 @@
+//// [collisionExportsRequireAndInternalModuleAlias.ts]
+export module m {
+    export class c {
+    }
+}
+import exports = m.c;
+import require = m.c;
+new exports();
+new require();
+
+module m1 {
+    import exports = m.c;
+    import require = m.c;
+    new exports();
+    new require();
+}
+
+module m2 {
+    export import exports = m.c;
+    export import require = m.c;
+    new exports();
+    new require();
+}
+
+//// [collisionExportsRequireAndInternalModuleAlias.js]
+define(["require", "exports"], function (require, exports) {
+    (function (m) {
+        var c = (function () {
+            function c() {
+            }
+            return c;
+        })();
+        m.c = c;
+    })(exports.m || (exports.m = {}));
+    var m = exports.m;
+    var exports = m.c;
+    var require = m.c;
+    new exports();
+    new require();
+    var m1;
+    (function (m1) {
+        var exports = m.c;
+        var require = m.c;
+        new exports();
+        new require();
+    })(m1 || (m1 = {}));
+    var m2;
+    (function (m2) {
+        m2.exports = m.c;
+        m2.require = m.c;
+        new m2.exports();
+        new m2.require();
+    })(m2 || (m2 = {}));
+});
diff --git a/tests/baselines/reference/collisionExportsRequireAndInternalModuleAliasInGlobalFile.js b/tests/baselines/reference/collisionExportsRequireAndInternalModuleAliasInGlobalFile.js
new file mode 100644
index 00000000000..c6a6e234ee9
--- /dev/null
+++ b/tests/baselines/reference/collisionExportsRequireAndInternalModuleAliasInGlobalFile.js
@@ -0,0 +1,52 @@
+//// [collisionExportsRequireAndInternalModuleAliasInGlobalFile.ts]
+module mOfGloalFile {
+    export class c {
+    }
+}
+import exports = mOfGloalFile.c;
+import require = mOfGloalFile.c;
+new exports();
+new require();
+
+module m1 {
+    import exports = mOfGloalFile.c;
+    import require = mOfGloalFile.c;
+    new exports();
+    new require();
+}
+
+module m2 {
+    export import exports = mOfGloalFile.c;
+    export import require = mOfGloalFile.c;
+    new exports();
+    new require();
+}
+
+//// [collisionExportsRequireAndInternalModuleAliasInGlobalFile.js]
+var mOfGloalFile;
+(function (mOfGloalFile) {
+    var c = (function () {
+        function c() {
+        }
+        return c;
+    })();
+    mOfGloalFile.c = c;
+})(mOfGloalFile || (mOfGloalFile = {}));
+var exports = mOfGloalFile.c;
+var require = mOfGloalFile.c;
+new exports();
+new require();
+var m1;
+(function (m1) {
+    var exports = mOfGloalFile.c;
+    var require = mOfGloalFile.c;
+    new exports();
+    new require();
+})(m1 || (m1 = {}));
+var m2;
+(function (m2) {
+    m2.exports = mOfGloalFile.c;
+    m2.require = mOfGloalFile.c;
+    new m2.exports();
+    new m2.require();
+})(m2 || (m2 = {}));
diff --git a/tests/baselines/reference/collisionExportsRequireAndInternalModuleAliasInGlobalFile.types b/tests/baselines/reference/collisionExportsRequireAndInternalModuleAliasInGlobalFile.types
new file mode 100644
index 00000000000..11001fe115f
--- /dev/null
+++ b/tests/baselines/reference/collisionExportsRequireAndInternalModuleAliasInGlobalFile.types
@@ -0,0 +1,69 @@
+=== tests/cases/compiler/collisionExportsRequireAndInternalModuleAliasInGlobalFile.ts ===
+module mOfGloalFile {
+>mOfGloalFile : typeof mOfGloalFile
+
+    export class c {
+>c : c
+    }
+}
+import exports = mOfGloalFile.c;
+>exports : typeof exports
+>mOfGloalFile : typeof mOfGloalFile
+>c : exports
+
+import require = mOfGloalFile.c;
+>require : typeof exports
+>mOfGloalFile : typeof mOfGloalFile
+>c : exports
+
+new exports();
+>new exports() : exports
+>exports : typeof exports
+
+new require();
+>new require() : exports
+>require : typeof exports
+
+module m1 {
+>m1 : typeof m1
+
+    import exports = mOfGloalFile.c;
+>exports : typeof exports
+>mOfGloalFile : typeof mOfGloalFile
+>c : exports
+
+    import require = mOfGloalFile.c;
+>require : typeof exports
+>mOfGloalFile : typeof mOfGloalFile
+>c : exports
+
+    new exports();
+>new exports() : exports
+>exports : typeof exports
+
+    new require();
+>new require() : exports
+>require : typeof exports
+}
+
+module m2 {
+>m2 : typeof m2
+
+    export import exports = mOfGloalFile.c;
+>exports : typeof exports
+>mOfGloalFile : typeof mOfGloalFile
+>c : exports
+
+    export import require = mOfGloalFile.c;
+>require : typeof exports
+>mOfGloalFile : typeof mOfGloalFile
+>c : exports
+
+    new exports();
+>new exports() : exports
+>exports : typeof exports
+
+    new require();
+>new require() : exports
+>require : typeof exports
+}
diff --git a/tests/baselines/reference/collisionExportsRequireAndModule.errors.txt b/tests/baselines/reference/collisionExportsRequireAndModule.errors.txt
index 1fe42767adb..4f1f9c4cd4d 100644
--- a/tests/baselines/reference/collisionExportsRequireAndModule.errors.txt
+++ b/tests/baselines/reference/collisionExportsRequireAndModule.errors.txt
@@ -1,4 +1,4 @@
-==== tests/cases/compiler/collisionExportsRequireAndModule.ts (2 errors) ====
+==== tests/cases/compiler/collisionExportsRequireAndModule_externalmodule.ts (2 errors) ====
     export module require {
                   ~~~~~~~
 !!! Duplicate identifier 'require'. Compiler reserves name 'require' in top level scope of an external module.
@@ -20,4 +20,75 @@
     }
     export function foo2(): exports.I {
         return null;
-    }
\ No newline at end of file
+    }
+    module m1 {
+        module require {
+            export interface I {
+            }
+            export class C {
+            }
+        }
+        module exports {
+            export interface I {
+            }
+            export class C {
+            }
+        }
+    }
+    module m2 {
+        export module require {
+            export interface I {
+            }
+            export class C {
+            }
+        }
+        export module exports {
+            export interface I {
+            }
+            export class C {
+            }
+        }
+    }
+    
+==== tests/cases/compiler/collisionExportsRequireAndModule_globalFile.ts (0 errors) ====
+    module require {
+        export interface I {
+        }
+        export class C {
+        }
+    }
+    module exports {
+        export interface I {
+        }
+        export class C {
+        }
+    }
+    module m3 {
+        module require {
+            export interface I {
+            }
+            export class C {
+            }
+        }
+        module exports {
+            export interface I {
+            }
+            export class C {
+            }
+        }
+    }
+    module m4 {
+        export module require {
+            export interface I {
+            }
+            export class C {
+            }
+        }
+        export module exports {
+            export interface I {
+            }
+            export class C {
+            }
+        }
+    }
+    
\ No newline at end of file
diff --git a/tests/baselines/reference/collisionExportsRequireAndModule.js b/tests/baselines/reference/collisionExportsRequireAndModule.js
index 88e53a922b0..76e170b18d1 100644
--- a/tests/baselines/reference/collisionExportsRequireAndModule.js
+++ b/tests/baselines/reference/collisionExportsRequireAndModule.js
@@ -1,4 +1,6 @@
-//// [collisionExportsRequireAndModule.ts]
+//// [tests/cases/compiler/collisionExportsRequireAndModule.ts] ////
+
+//// [collisionExportsRequireAndModule_externalmodule.ts]
 export module require {
     export interface I {
     }
@@ -16,9 +18,80 @@ export module exports {
 }
 export function foo2(): exports.I {
     return null;
-}
+}
+module m1 {
+    module require {
+        export interface I {
+        }
+        export class C {
+        }
+    }
+    module exports {
+        export interface I {
+        }
+        export class C {
+        }
+    }
+}
+module m2 {
+    export module require {
+        export interface I {
+        }
+        export class C {
+        }
+    }
+    export module exports {
+        export interface I {
+        }
+        export class C {
+        }
+    }
+}
 
-//// [collisionExportsRequireAndModule.js]
+//// [collisionExportsRequireAndModule_globalFile.ts]
+module require {
+    export interface I {
+    }
+    export class C {
+    }
+}
+module exports {
+    export interface I {
+    }
+    export class C {
+    }
+}
+module m3 {
+    module require {
+        export interface I {
+        }
+        export class C {
+        }
+    }
+    module exports {
+        export interface I {
+        }
+        export class C {
+        }
+    }
+}
+module m4 {
+    export module require {
+        export interface I {
+        }
+        export class C {
+        }
+    }
+    export module exports {
+        export interface I {
+        }
+        export class C {
+        }
+    }
+}
+
+
+//// [collisionExportsRequireAndModule_externalmodule.js]
 define(["require", "exports"], function (require, exports) {
     (function (require) {
         var C = (function () {
@@ -46,4 +119,107 @@ define(["require", "exports"], function (require, exports) {
         return null;
     }
     exports.foo2 = foo2;
+    var m1;
+    (function (m1) {
+        var require;
+        (function (require) {
+            var C = (function () {
+                function C() {
+                }
+                return C;
+            })();
+            require.C = C;
+        })(require || (require = {}));
+        var exports;
+        (function (exports) {
+            var C = (function () {
+                function C() {
+                }
+                return C;
+            })();
+            exports.C = C;
+        })(exports || (exports = {}));
+    })(m1 || (m1 = {}));
+    var m2;
+    (function (m2) {
+        (function (require) {
+            var C = (function () {
+                function C() {
+                }
+                return C;
+            })();
+            require.C = C;
+        })(m2.require || (m2.require = {}));
+        var require = m2.require;
+        (function (exports) {
+            var C = (function () {
+                function C() {
+                }
+                return C;
+            })();
+            exports.C = C;
+        })(m2.exports || (m2.exports = {}));
+        var exports = m2.exports;
+    })(m2 || (m2 = {}));
 });
+//// [collisionExportsRequireAndModule_globalFile.js]
+var require;
+(function (require) {
+    var C = (function () {
+        function C() {
+        }
+        return C;
+    })();
+    require.C = C;
+})(require || (require = {}));
+var exports;
+(function (exports) {
+    var C = (function () {
+        function C() {
+        }
+        return C;
+    })();
+    exports.C = C;
+})(exports || (exports = {}));
+var m3;
+(function (m3) {
+    var require;
+    (function (require) {
+        var C = (function () {
+            function C() {
+            }
+            return C;
+        })();
+        require.C = C;
+    })(require || (require = {}));
+    var exports;
+    (function (exports) {
+        var C = (function () {
+            function C() {
+            }
+            return C;
+        })();
+        exports.C = C;
+    })(exports || (exports = {}));
+})(m3 || (m3 = {}));
+var m4;
+(function (m4) {
+    (function (require) {
+        var C = (function () {
+            function C() {
+            }
+            return C;
+        })();
+        require.C = C;
+    })(m4.require || (m4.require = {}));
+    var require = m4.require;
+    (function (exports) {
+        var C = (function () {
+            function C() {
+            }
+            return C;
+        })();
+        exports.C = C;
+    })(m4.exports || (m4.exports = {}));
+    var exports = m4.exports;
+})(m4 || (m4 = {}));
diff --git a/tests/baselines/reference/collisionExportsRequireAndVar.errors.txt b/tests/baselines/reference/collisionExportsRequireAndVar.errors.txt
index 127a40f0f0b..d5106a0fe50 100644
--- a/tests/baselines/reference/collisionExportsRequireAndVar.errors.txt
+++ b/tests/baselines/reference/collisionExportsRequireAndVar.errors.txt
@@ -1,4 +1,4 @@
-==== tests/cases/compiler/collisionExportsRequireAndVar.ts (2 errors) ====
+==== tests/cases/compiler/collisionExportsRequireAndVar_externalmodule.ts (2 errors) ====
     export function foo() {
     }
     var exports = 1;
@@ -7,4 +7,23 @@
     var require = "require";
         ~~~~~~~
 !!! Duplicate identifier 'require'. Compiler reserves name 'require' in top level scope of an external module.
-    
\ No newline at end of file
+    module m1 {
+        var exports = 0;
+        var require = "require";
+    }
+    module m2 {
+        export var exports = 0;
+        export var require = "require";
+    }
+    
+==== tests/cases/compiler/collisionExportsRequireAndVar_globalFile.ts (0 errors) ====
+    var exports = 0;
+    var require = "require";
+    module m3 {
+        var exports = 0;
+        var require = "require";
+    }
+    module m4 {
+        export var exports = 0;
+        export var require = "require";
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/collisionExportsRequireAndVar.js b/tests/baselines/reference/collisionExportsRequireAndVar.js
index a7604038563..07c8827603e 100644
--- a/tests/baselines/reference/collisionExportsRequireAndVar.js
+++ b/tests/baselines/reference/collisionExportsRequireAndVar.js
@@ -1,15 +1,59 @@
-//// [collisionExportsRequireAndVar.ts]
+//// [tests/cases/compiler/collisionExportsRequireAndVar.ts] ////
+
+//// [collisionExportsRequireAndVar_externalmodule.ts]
 export function foo() {
 }
 var exports = 1;
 var require = "require";
+module m1 {
+    var exports = 0;
+    var require = "require";
+}
+module m2 {
+    export var exports = 0;
+    export var require = "require";
+}
 
+//// [collisionExportsRequireAndVar_globalFile.ts]
+var exports = 0;
+var require = "require";
+module m3 {
+    var exports = 0;
+    var require = "require";
+}
+module m4 {
+    export var exports = 0;
+    export var require = "require";
+}
 
-//// [collisionExportsRequireAndVar.js]
+//// [collisionExportsRequireAndVar_externalmodule.js]
 define(["require", "exports"], function (require, exports) {
     function foo() {
     }
     exports.foo = foo;
     var exports = 1;
     var require = "require";
+    var m1;
+    (function (m1) {
+        var exports = 0;
+        var require = "require";
+    })(m1 || (m1 = {}));
+    var m2;
+    (function (m2) {
+        m2.exports = 0;
+        m2.require = "require";
+    })(m2 || (m2 = {}));
 });
+//// [collisionExportsRequireAndVar_globalFile.js]
+var exports = 0;
+var require = "require";
+var m3;
+(function (m3) {
+    var exports = 0;
+    var require = "require";
+})(m3 || (m3 = {}));
+var m4;
+(function (m4) {
+    m4.exports = 0;
+    m4.require = "require";
+})(m4 || (m4 = {}));
diff --git a/tests/cases/compiler/collisionExportsRequireAndAmbientClass.ts b/tests/cases/compiler/collisionExportsRequireAndAmbientClass.ts
new file mode 100644
index 00000000000..563c834c79c
--- /dev/null
+++ b/tests/cases/compiler/collisionExportsRequireAndAmbientClass.ts
@@ -0,0 +1,37 @@
+//@module: amd
+//@filename: collisionExportsRequireAndAmbientClass_externalmodule.ts
+export declare class require {
+}
+export declare class exports {
+}
+declare module m1 {
+    class require {
+    }
+    class exports {
+    }
+}
+module m2 {
+    export declare class require {
+    }
+    export declare class exports {
+    }
+}
+
+//@filename: collisionExportsRequireAndAmbientClass_globalFile.ts
+declare class require {
+}
+declare class exports {
+}
+declare module m3 {
+    class require {
+    }
+    class exports {
+    }
+}
+module m4 {
+    export declare class require {
+    }
+    export declare class exports {
+    }
+    var a = 10;
+}
\ No newline at end of file
diff --git a/tests/cases/compiler/collisionExportsRequireAndAmbientEnum.ts b/tests/cases/compiler/collisionExportsRequireAndAmbientEnum.ts
new file mode 100644
index 00000000000..5366d5511f9
--- /dev/null
+++ b/tests/cases/compiler/collisionExportsRequireAndAmbientEnum.ts
@@ -0,0 +1,60 @@
+//@module: amd
+//@filename: collisionExportsRequireAndAmbientEnum_externalmodule.ts
+export declare enum require {
+    _thisVal1,
+    _thisVal2,
+}
+export declare enum exports {
+    _thisVal1,
+    _thisVal2,
+}
+declare module m1 {
+    enum require {
+        _thisVal1,
+        _thisVal2,
+    }
+    enum exports {
+        _thisVal1,
+        _thisVal2,
+    }
+}
+module m2 {
+    export declare enum require { 
+        _thisVal1,
+        _thisVal2,
+    }
+    export declare enum exports {
+        _thisVal1,
+        _thisVal2,
+    }
+}
+
+//@filename: collisionExportsRequireAndAmbientEnum_globalFile.ts
+declare enum require {
+    _thisVal1,
+    _thisVal2,
+}
+declare enum exports {
+    _thisVal1,
+    _thisVal2,
+}
+declare module m3 {
+    enum require {
+        _thisVal1,
+        _thisVal2,
+    }
+    enum exports {
+        _thisVal1,
+        _thisVal2,
+    }
+}
+module m4 {
+    export declare enum require {
+        _thisVal1,
+        _thisVal2,
+    }
+    export declare enum exports {
+        _thisVal1,
+        _thisVal2,
+    }
+}
\ No newline at end of file
diff --git a/tests/cases/compiler/collisionExportsRequireAndAmbientFunction.ts b/tests/cases/compiler/collisionExportsRequireAndAmbientFunction.ts
new file mode 100644
index 00000000000..caabb75971a
--- /dev/null
+++ b/tests/cases/compiler/collisionExportsRequireAndAmbientFunction.ts
@@ -0,0 +1,14 @@
+//@module: amd
+export declare function exports(): number;
+
+export declare function require(): string[];
+    
+declare module m1 {
+    function exports(): string;
+    function require(): number;
+}
+module m2 {
+    export declare function exports(): string;
+    export declare function require(): string[];
+    var a = 10;
+}
\ No newline at end of file
diff --git a/tests/cases/compiler/collisionExportsRequireAndAmbientFunctionInGlobalFile.ts b/tests/cases/compiler/collisionExportsRequireAndAmbientFunctionInGlobalFile.ts
new file mode 100644
index 00000000000..2b3663f4d9e
--- /dev/null
+++ b/tests/cases/compiler/collisionExportsRequireAndAmbientFunctionInGlobalFile.ts
@@ -0,0 +1,11 @@
+declare function exports(): number;
+declare function require(): string;
+declare module m3 {
+    function exports(): string[];
+    function require(): number[];
+}
+module m4 {
+    export declare function exports(): string;
+    export declare function require(): string;
+    var a = 10;
+}
\ No newline at end of file
diff --git a/tests/cases/compiler/collisionExportsRequireAndAmbientModule.ts b/tests/cases/compiler/collisionExportsRequireAndAmbientModule.ts
new file mode 100644
index 00000000000..b94fcb0cc32
--- /dev/null
+++ b/tests/cases/compiler/collisionExportsRequireAndAmbientModule.ts
@@ -0,0 +1,93 @@
+//@module: amd
+//@filename: collisionExportsRequireAndAmbientModule_externalmodule.ts
+export declare module require {
+    export interface I {
+    }
+    export class C {
+    }
+}
+export function foo(): require.I {
+    return null;
+}
+export declare module exports {
+    export interface I {
+    }
+    export class C {
+    }
+}
+export function foo2(): exports.I {
+    return null;
+}
+declare module m1 {
+    module require {
+        export interface I {
+        }
+        export class C {
+        }
+    }
+    module exports {
+        export interface I {
+        }
+        export class C {
+        }
+    }
+}
+module m2 {
+    export declare module require {
+        export interface I {
+        }
+        export class C {
+        }
+    }
+    export declare module exports {
+        export interface I {
+        }
+        export class C {
+        }
+    }
+    var a = 10;
+}
+
+//@filename: collisionExportsRequireAndAmbientModule_globalFile.ts
+declare module require {
+    export interface I {
+    }
+    export class C {
+    }
+}
+declare module exports {
+    export interface I {
+    }
+    export class C {
+    }
+}
+declare module m3 {
+    module require {
+        export interface I {
+        }
+        export class C {
+        }
+    }
+    module exports {
+        export interface I {
+        }
+        export class C {
+        }
+    }
+}
+module m4 {
+    export declare module require {
+        export interface I {
+        }
+        export class C {
+        }
+    }
+    export declare module exports {
+        export interface I {
+        }
+        export class C {
+        }
+    }
+
+    var a = 10;
+}
diff --git a/tests/cases/compiler/collisionExportsRequireAndAmbientVar.ts b/tests/cases/compiler/collisionExportsRequireAndAmbientVar.ts
new file mode 100644
index 00000000000..0e17603c925
--- /dev/null
+++ b/tests/cases/compiler/collisionExportsRequireAndAmbientVar.ts
@@ -0,0 +1,26 @@
+//@module: amd
+//@filename: collisionExportsRequireAndAmbientVar_externalmodule.ts
+export declare var exports: number;
+export declare var require: string;
+declare module m1 {
+    var exports: string;
+    var require: number;
+}
+module m2 {
+    export declare var exports: number;
+    export declare var require: string;
+    var a = 10;
+}
+
+//@filename: collisionExportsRequireAndAmbientVar_globalFile.ts
+declare var exports: number;
+declare var require: string;
+declare module m3 {
+    var exports: string;
+    var require: number;
+}
+module m4 {
+    export declare var exports: string;
+    export declare var require: number;
+    var a = 10;
+}
\ No newline at end of file
diff --git a/tests/cases/compiler/collisionExportsRequireAndClass.ts b/tests/cases/compiler/collisionExportsRequireAndClass.ts
index 73efb9cbe89..0bc1e0e337b 100644
--- a/tests/cases/compiler/collisionExportsRequireAndClass.ts
+++ b/tests/cases/compiler/collisionExportsRequireAndClass.ts
@@ -1,5 +1,36 @@
 //@module: amd
+//@filename: collisionExportsRequireAndClass_externalmodule.ts
 export class require {
 }
 export class exports {
 }
+module m1 {
+    class require {
+    }
+    class exports {
+    }
+}
+module m2 {
+    export class require {
+    }
+    export class exports {
+    }
+}
+
+//@filename: collisionExportsRequireAndClass_globalFile.ts
+class require {
+}
+class exports {
+}
+module m3 {
+    class require {
+    }
+    class exports {
+    }
+}
+module m4 {
+    export class require {
+    }
+    export class exports {
+    }
+}
\ No newline at end of file
diff --git a/tests/cases/compiler/collisionExportsRequireAndEnum.ts b/tests/cases/compiler/collisionExportsRequireAndEnum.ts
index 936db765c14..b8bb1727480 100644
--- a/tests/cases/compiler/collisionExportsRequireAndEnum.ts
+++ b/tests/cases/compiler/collisionExportsRequireAndEnum.ts
@@ -1,4 +1,5 @@
 //@module: amd
+//@filename: collisionExportsRequireAndEnum_externalmodule.ts
 export enum require { // Error
     _thisVal1,
     _thisVal2,
@@ -6,4 +7,54 @@ export enum require { // Error
 export enum exports { // Error
     _thisVal1,
     _thisVal2,
+}
+module m1 {
+    enum require {
+        _thisVal1,
+        _thisVal2,
+    }
+    enum exports {
+        _thisVal1,
+        _thisVal2,
+    }
+}
+module m2 {
+    export enum require { 
+        _thisVal1,
+        _thisVal2,
+    }
+    export enum exports {
+        _thisVal1,
+        _thisVal2,
+    }
+}
+
+//@filename: collisionExportsRequireAndEnum_globalFile.ts
+enum require {
+    _thisVal1,
+    _thisVal2,
+}
+enum exports {
+    _thisVal1,
+    _thisVal2,
+}
+module m3 {
+    enum require {
+        _thisVal1,
+        _thisVal2,
+    }
+    enum exports {
+        _thisVal1,
+        _thisVal2,
+    }
+}
+module m4 {
+    export enum require {
+        _thisVal1,
+        _thisVal2,
+    }
+    export enum exports {
+        _thisVal1,
+        _thisVal2,
+    }
 }
\ No newline at end of file
diff --git a/tests/cases/compiler/collisionExportsRequireAndFunction.ts b/tests/cases/compiler/collisionExportsRequireAndFunction.ts
index 94aec04ff2c..185b0a41805 100644
--- a/tests/cases/compiler/collisionExportsRequireAndFunction.ts
+++ b/tests/cases/compiler/collisionExportsRequireAndFunction.ts
@@ -5,3 +5,19 @@ export function exports() {
 export function require() {
     return "require";
 }
+module m1 {
+    function exports() {
+        return 1;
+    }
+    function require() {
+        return "require";
+    }
+}
+module m2 {
+    export function exports() {
+        return 1;
+    }
+    export function require() {
+        return "require";
+    }
+}
\ No newline at end of file
diff --git a/tests/cases/compiler/collisionExportsRequireAndFunctionInGlobalFile.ts b/tests/cases/compiler/collisionExportsRequireAndFunctionInGlobalFile.ts
new file mode 100644
index 00000000000..050887580f7
--- /dev/null
+++ b/tests/cases/compiler/collisionExportsRequireAndFunctionInGlobalFile.ts
@@ -0,0 +1,22 @@
+function exports() {
+    return 1;
+}
+function require() {
+    return "require";
+}
+module m3 {
+    function exports() {
+        return 1;
+    }
+    function require() {
+        return "require";
+    }
+}
+module m4 {
+    export function exports() {
+        return 1;
+    }
+    export function require() {
+        return "require";
+    }
+}
\ No newline at end of file
diff --git a/tests/cases/compiler/collisionExportsRequireAndInternalModuleAlias.ts b/tests/cases/compiler/collisionExportsRequireAndInternalModuleAlias.ts
new file mode 100644
index 00000000000..e76fc572b75
--- /dev/null
+++ b/tests/cases/compiler/collisionExportsRequireAndInternalModuleAlias.ts
@@ -0,0 +1,23 @@
+//@module: amd
+export module m {
+    export class c {
+    }
+}
+import exports = m.c;
+import require = m.c;
+new exports();
+new require();
+
+module m1 {
+    import exports = m.c;
+    import require = m.c;
+    new exports();
+    new require();
+}
+
+module m2 {
+    export import exports = m.c;
+    export import require = m.c;
+    new exports();
+    new require();
+}
\ No newline at end of file
diff --git a/tests/cases/compiler/collisionExportsRequireAndInternalModuleAliasInGlobalFile.ts b/tests/cases/compiler/collisionExportsRequireAndInternalModuleAliasInGlobalFile.ts
new file mode 100644
index 00000000000..d76da86891e
--- /dev/null
+++ b/tests/cases/compiler/collisionExportsRequireAndInternalModuleAliasInGlobalFile.ts
@@ -0,0 +1,22 @@
+module mOfGloalFile {
+    export class c {
+    }
+}
+import exports = mOfGloalFile.c;
+import require = mOfGloalFile.c;
+new exports();
+new require();
+
+module m1 {
+    import exports = mOfGloalFile.c;
+    import require = mOfGloalFile.c;
+    new exports();
+    new require();
+}
+
+module m2 {
+    export import exports = mOfGloalFile.c;
+    export import require = mOfGloalFile.c;
+    new exports();
+    new require();
+}
\ No newline at end of file
diff --git a/tests/cases/compiler/collisionExportsRequireAndModule.ts b/tests/cases/compiler/collisionExportsRequireAndModule.ts
index c0254243234..dc79e15605c 100644
--- a/tests/cases/compiler/collisionExportsRequireAndModule.ts
+++ b/tests/cases/compiler/collisionExportsRequireAndModule.ts
@@ -1,4 +1,5 @@
 //@module: amd
+//@filename: collisionExportsRequireAndModule_externalmodule.ts
 export module require {
     export interface I {
     }
@@ -16,4 +17,74 @@ export module exports {
 }
 export function foo2(): exports.I {
     return null;
-}
\ No newline at end of file
+}
+module m1 {
+    module require {
+        export interface I {
+        }
+        export class C {
+        }
+    }
+    module exports {
+        export interface I {
+        }
+        export class C {
+        }
+    }
+}
+module m2 {
+    export module require {
+        export interface I {
+        }
+        export class C {
+        }
+    }
+    export module exports {
+        export interface I {
+        }
+        export class C {
+        }
+    }
+}
+
+//@filename: collisionExportsRequireAndModule_globalFile.ts
+module require {
+    export interface I {
+    }
+    export class C {
+    }
+}
+module exports {
+    export interface I {
+    }
+    export class C {
+    }
+}
+module m3 {
+    module require {
+        export interface I {
+        }
+        export class C {
+        }
+    }
+    module exports {
+        export interface I {
+        }
+        export class C {
+        }
+    }
+}
+module m4 {
+    export module require {
+        export interface I {
+        }
+        export class C {
+        }
+    }
+    export module exports {
+        export interface I {
+        }
+        export class C {
+        }
+    }
+}
diff --git a/tests/cases/compiler/collisionExportsRequireAndVar.ts b/tests/cases/compiler/collisionExportsRequireAndVar.ts
index da1000009fd..af98b1a7d09 100644
--- a/tests/cases/compiler/collisionExportsRequireAndVar.ts
+++ b/tests/cases/compiler/collisionExportsRequireAndVar.ts
@@ -1,5 +1,26 @@
 //@module: amd
+//@filename: collisionExportsRequireAndVar_externalmodule.ts
 export function foo() {
 }
 var exports = 1;
 var require = "require";
+module m1 {
+    var exports = 0;
+    var require = "require";
+}
+module m2 {
+    export var exports = 0;
+    export var require = "require";
+}
+
+//@filename: collisionExportsRequireAndVar_globalFile.ts
+var exports = 0;
+var require = "require";
+module m3 {
+    var exports = 0;
+    var require = "require";
+}
+module m4 {
+    export var exports = 0;
+    export var require = "require";
+}
\ No newline at end of file