diff --git a/Jakefile.js b/Jakefile.js
index 76ac1b19b2c..c561b72f472 100644
--- a/Jakefile.js
+++ b/Jakefile.js
@@ -70,14 +70,15 @@ var compilerSources = [
     "visitor.ts",
     "transformers/destructuring.ts",
     "transformers/ts.ts",
-    "transformers/module/es2015.ts",
-    "transformers/module/system.ts",
-    "transformers/module/module.ts",
     "transformers/jsx.ts",
     "transformers/es2017.ts",
     "transformers/es2016.ts",
     "transformers/es2015.ts",
+    "transformers/es5.ts",
     "transformers/generators.ts",
+    "transformers/module/es2015.ts",
+    "transformers/module/system.ts",
+    "transformers/module/module.ts",
     "transformer.ts",
     "sourcemap.ts",
     "comments.ts",
@@ -105,14 +106,14 @@ var servicesSources = [
     "visitor.ts",
     "transformers/destructuring.ts",
     "transformers/ts.ts",
-    "transformers/module/es2015.ts",
-    "transformers/module/system.ts",
-    "transformers/module/module.ts",
     "transformers/jsx.ts",
     "transformers/es2017.ts",
     "transformers/es2016.ts",
     "transformers/es2015.ts",
     "transformers/generators.ts",
+    "transformers/module/es2015.ts",
+    "transformers/module/system.ts",
+    "transformers/module/module.ts",
     "transformer.ts",
     "sourcemap.ts",
     "comments.ts",
diff --git a/src/compiler/transformer.ts b/src/compiler/transformer.ts
index fc656e08bf9..82e1843b70b 100644
--- a/src/compiler/transformer.ts
+++ b/src/compiler/transformer.ts
@@ -4,6 +4,7 @@
 /// <reference path="transformers/es2017.ts" />
 /// <reference path="transformers/es2016.ts" />
 /// <reference path="transformers/es2015.ts" />
+/// <reference path="transformers/es5.ts" />
 /// <reference path="transformers/generators.ts" />
 /// <reference path="transformers/module/module.ts" />
 /// <reference path="transformers/module/system.ts" />
@@ -129,6 +130,10 @@ namespace ts {
             transformers.push(transformGenerators);
         }
 
+        if (languageVersion < ScriptTarget.ES5) {
+            transformers.push(transformES5);
+        }
+
         return transformers;
     }
 
diff --git a/src/compiler/transformers/es5.ts b/src/compiler/transformers/es5.ts
new file mode 100644
index 00000000000..9e5a72c2bad
--- /dev/null
+++ b/src/compiler/transformers/es5.ts
@@ -0,0 +1,83 @@
+/// <reference path="../factory.ts" />
+/// <reference path="../visitor.ts" />
+
+/*@internal*/
+namespace ts {
+    /**
+     * Transforms ES5 syntax into ES3 syntax.
+     *
+     * @param context Context and state information for the transformation.
+     */
+    export function transformES5(context: TransformationContext) {
+        const previousOnSubstituteNode = context.onSubstituteNode;
+        context.onSubstituteNode = onSubstituteNode;
+        context.enableSubstitution(SyntaxKind.PropertyAccessExpression);
+        context.enableSubstitution(SyntaxKind.PropertyAssignment);
+        return transformSourceFile;
+
+        /**
+         * Transforms an ES5 source file to ES3.
+         *
+         * @param node A SourceFile
+         */
+        function transformSourceFile(node: SourceFile) {
+            return node;
+        }
+
+        /**
+         * Hooks node substitutions.
+         *
+         * @param emitContext The context for the emitter.
+         * @param node The node to substitute.
+         */
+        function onSubstituteNode(emitContext: EmitContext, node: Node) {
+            node = previousOnSubstituteNode(emitContext, node);
+            if (isPropertyAccessExpression(node)) {
+                return substitutePropertyAccessExpression(node);
+            }
+            else if (isPropertyAssignment(node)) {
+                return substitutePropertyAssignment(node);
+            }
+            return node;
+        }
+
+        /**
+         * Substitutes a PropertyAccessExpression whose name is a reserved word.
+         *
+         * @param node A PropertyAccessExpression
+         */
+        function substitutePropertyAccessExpression(node: PropertyAccessExpression): Expression {
+            const literalName = trySubstituteReservedName(node.name);
+            if (literalName) {
+                return createElementAccess(node.expression, literalName, /*location*/ node);
+            }
+            return node;
+        }
+
+        /**
+         * Substitutes a PropertyAssignment whose name is a reserved word.
+         *
+         * @param node A PropertyAssignment
+         */
+        function substitutePropertyAssignment(node: PropertyAssignment): PropertyAssignment {
+            const literalName = isIdentifier(node.name) && trySubstituteReservedName(node.name);
+            if (literalName) {
+                return updatePropertyAssignment(node, literalName, node.initializer);
+            }
+            return node;
+        }
+
+        /**
+         * If an identifier name is a reserved word, returns a string literal for the name.
+         *
+         * @param name An Identifier
+         */
+        function trySubstituteReservedName(name: Identifier) {
+            const token = name.originalKeywordKind || (nodeIsSynthesized(name) ? stringToToken(name.text) : undefined);
+            if (token >= SyntaxKind.FirstReservedWord && token <= SyntaxKind.LastReservedWord) {
+                return createLiteral(name, /*location*/ name);
+            }
+            return undefined;
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/compiler/transformers/module/module.ts b/src/compiler/transformers/module/module.ts
index b91f67382cd..1cca7a21777 100644
--- a/src/compiler/transformers/module/module.ts
+++ b/src/compiler/transformers/module/module.ts
@@ -958,39 +958,19 @@ namespace ts {
                 const declaration = resolver.getReferencedImportDeclaration(node);
                 if (declaration) {
                     if (isImportClause(declaration)) {
-                        if (languageVersion >= ScriptTarget.ES5) {
-                            return createPropertyAccess(
-                                getGeneratedNameForNode(declaration.parent),
-                                createIdentifier("default"),
-                                /*location*/ node
-                            );
-                        }
-                        else {
-                            // TODO: ES3 transform to handle x.default -> x["default"]
-                            return createElementAccess(
-                                getGeneratedNameForNode(declaration.parent),
-                                createLiteral("default"),
-                                /*location*/ node
-                            );
-                        }
+                        return createPropertyAccess(
+                            getGeneratedNameForNode(declaration.parent),
+                            createIdentifier("default"),
+                            /*location*/ node
+                        );
                     }
                     else if (isImportSpecifier(declaration)) {
                         const name = declaration.propertyName || declaration.name;
-                        if (name.originalKeywordKind === SyntaxKind.DefaultKeyword && languageVersion <= ScriptTarget.ES3) {
-                            // TODO: ES3 transform to handle x.default -> x["default"]
-                            return createElementAccess(
-                                getGeneratedNameForNode(declaration.parent.parent.parent),
-                                createLiteral(name.text),
-                                /*location*/ node
-                            );
-                        }
-                        else {
-                            return createPropertyAccess(
-                                getGeneratedNameForNode(declaration.parent.parent.parent),
-                                getSynthesizedClone(name),
-                                /*location*/ node
-                            );
-                        }
+                        return createPropertyAccess(
+                            getGeneratedNameForNode(declaration.parent.parent.parent),
+                            getSynthesizedClone(name),
+                            /*location*/ node
+                        );
                     }
                 }
             }
@@ -1027,15 +1007,10 @@ namespace ts {
 
         function createExportAssignment(name: Identifier, value: Expression) {
             return createAssignment(
-                name.originalKeywordKind === SyntaxKind.DefaultKeyword && languageVersion === ScriptTarget.ES3
-                    ? createElementAccess(
-                        createIdentifier("exports"),
-                        createLiteral(name.text)
-                    )
-                    : createPropertyAccess(
-                        createIdentifier("exports"),
-                        getSynthesizedClone(name)
-                    ),
+                createPropertyAccess(
+                    createIdentifier("exports"),
+                    getSynthesizedClone(name)
+                ),
                 value
             );
         }
diff --git a/src/compiler/transformers/module/system.ts b/src/compiler/transformers/module/system.ts
index b33b3058f8c..775d8fc34f9 100644
--- a/src/compiler/transformers/module/system.ts
+++ b/src/compiler/transformers/module/system.ts
@@ -19,7 +19,6 @@ namespace ts {
         const compilerOptions = context.getCompilerOptions();
         const resolver = context.getEmitResolver();
         const host = context.getEmitHost();
-        const languageVersion = getEmitScriptTarget(compilerOptions);
         const previousOnSubstituteNode = context.onSubstituteNode;
         const previousOnEmitNode = context.onEmitNode;
         context.onSubstituteNode = onSubstituteNode;
@@ -1317,12 +1316,7 @@ namespace ts {
                 return undefined;
             }
 
-            if (name.originalKeywordKind && languageVersion === ScriptTarget.ES3) {
-                return createElementAccess(importAlias, createLiteral(name.text));
-            }
-            else {
-                return createPropertyAccess(importAlias, getSynthesizedClone(name));
-            }
+            return createPropertyAccess(importAlias, getSynthesizedClone(name));
         }
 
         function collectDependencyGroups(externalImports: (ImportDeclaration | ImportEqualsDeclaration | ExportDeclaration)[]) {
diff --git a/src/compiler/tsconfig.json b/src/compiler/tsconfig.json
index da356c0b4d3..cc1f3125166 100644
--- a/src/compiler/tsconfig.json
+++ b/src/compiler/tsconfig.json
@@ -27,6 +27,7 @@
         "transformers/es2017.ts",
         "transformers/es2016.ts",
         "transformers/es2015.ts",
+        "transformers/es5.ts",
         "transformers/generators.ts",
         "transformers/destructuring.ts",
         "transformers/module/module.ts",
diff --git a/src/harness/tsconfig.json b/src/harness/tsconfig.json
index 5d7a81d1a74..e5e14266ec7 100644
--- a/src/harness/tsconfig.json
+++ b/src/harness/tsconfig.json
@@ -29,6 +29,7 @@
         "../compiler/transformers/es2017.ts",
         "../compiler/transformers/es2016.ts",
         "../compiler/transformers/es2015.ts",
+        "../compiler/transformers/es5.ts",
         "../compiler/transformers/generators.ts",
         "../compiler/transformers/destructuring.ts",
         "../compiler/transformers/module/module.ts",
diff --git a/src/services/tsconfig.json b/src/services/tsconfig.json
index 03d04935068..1033a3aa553 100644
--- a/src/services/tsconfig.json
+++ b/src/services/tsconfig.json
@@ -28,6 +28,7 @@
         "../compiler/transformers/es2017.ts",
         "../compiler/transformers/es2016.ts",
         "../compiler/transformers/es2015.ts",
+        "../compiler/transformers/es5.ts",
         "../compiler/transformers/generators.ts",
         "../compiler/transformers/destructuring.ts",
         "../compiler/transformers/module/module.ts",
diff --git a/tests/baselines/reference/allowSyntheticDefaultImports10.js b/tests/baselines/reference/allowSyntheticDefaultImports10.js
index 746997c4c89..396cd75b574 100644
--- a/tests/baselines/reference/allowSyntheticDefaultImports10.js
+++ b/tests/baselines/reference/allowSyntheticDefaultImports10.js
@@ -13,5 +13,5 @@ Foo.default.default.foo();
 //// [a.js]
 "use strict";
 var Foo = require("./b");
-Foo.default.bar();
-Foo.default.default.foo();
+Foo["default"].bar();
+Foo["default"]["default"].foo();
diff --git a/tests/baselines/reference/bluebirdStaticThis.js b/tests/baselines/reference/bluebirdStaticThis.js
index 301f32319a7..606f778323f 100644
--- a/tests/baselines/reference/bluebirdStaticThis.js
+++ b/tests/baselines/reference/bluebirdStaticThis.js
@@ -146,12 +146,12 @@ var x;
 var arr;
 var foo;
 var fooProm;
-fooProm = Promise.try(Promise, function () {
+fooProm = Promise["try"](Promise, function () {
     return foo;
 });
-fooProm = Promise.try(Promise, function () {
+fooProm = Promise["try"](Promise, function () {
     return foo;
 }, arr);
-fooProm = Promise.try(Promise, function () {
+fooProm = Promise["try"](Promise, function () {
     return foo;
 }, arr, x);
diff --git a/tests/baselines/reference/classMethodWithKeywordName1.js b/tests/baselines/reference/classMethodWithKeywordName1.js
index 6e1faee005c..a7cb994bfb3 100644
--- a/tests/baselines/reference/classMethodWithKeywordName1.js
+++ b/tests/baselines/reference/classMethodWithKeywordName1.js
@@ -7,6 +7,6 @@ class C {
 var C = (function () {
     function C() {
     }
-    C.try = function () { };
+    C["try"] = function () { };
     return C;
 }());
diff --git a/tests/baselines/reference/constructorWithIncompleteTypeAnnotation.js b/tests/baselines/reference/constructorWithIncompleteTypeAnnotation.js
index 2e3190c15c8..1ee309b0eb4 100644
--- a/tests/baselines/reference/constructorWithIncompleteTypeAnnotation.js
+++ b/tests/baselines/reference/constructorWithIncompleteTypeAnnotation.js
@@ -292,7 +292,7 @@ var TypeScriptAllInOne;
 (function (TypeScriptAllInOne) {
     var Program = (function () {
         function Program() {
-            this.case = bfs.STATEMENTS(4);
+            this["case"] = bfs.STATEMENTS(4);
         }
         Program.Main = function () {
             var args = [];
@@ -305,13 +305,13 @@ var TypeScriptAllInOne;
                 retValue = bfs.VARIABLES();
                 if (retValue != 0)
                      ^= {
-                        return: 1
+                        "return": 1
                     };
             }
             finally {
             }
         };
-        Program.prototype.if = function (retValue) {
+        Program.prototype["if"] = function (retValue) {
             if (retValue === void 0) { retValue =  != 0; }
             return 1;
                 ^
@@ -327,7 +327,7 @@ var TypeScriptAllInOne;
                 return 1;
             }
         };
-        Program.prototype.catch = function (e) {
+        Program.prototype["catch"] = function (e) {
             console.log(e);
         };
         return Program;
@@ -364,7 +364,7 @@ var BasicFeatures = (function () {
         ;
         var quoted = '"', quoted2 = "'";
         var reg = /\w*/;
-        var objLit = { "var": number = 42, equals: function (x) { return x["var"] === 42; }, instanceof: function () { return 'objLit{42}'; } };
+        var objLit = { "var": number = 42, equals: function (x) { return x["var"] === 42; }, "instanceof": function () { return 'objLit{42}'; } };
         var weekday = Weekdays.Monday;
         var con = char + f + hexchar + float.toString() + float2.toString() + reg.toString() + objLit + weekday;
         //
diff --git a/tests/baselines/reference/convertKeywordsYes.js b/tests/baselines/reference/convertKeywordsYes.js
index ba3c661d1d0..b7bd60e4a95 100644
--- a/tests/baselines/reference/convertKeywordsYes.js
+++ b/tests/baselines/reference/convertKeywordsYes.js
@@ -344,43 +344,43 @@ var bigObject = {
     string: 0,
     get: 0,
     yield: 0,
-    break: 0,
-    case: 0,
-    catch: 0,
-    class: 0,
-    continue: 0,
-    const: 0,
-    debugger: 0,
+    "break": 0,
+    "case": 0,
+    "catch": 0,
+    "class": 0,
+    "continue": 0,
+    "const": 0,
+    "debugger": 0,
     declare: 0,
-    default: 0,
-    delete: 0,
-    do: 0,
-    else: 0,
-    enum: 0,
-    export: 0,
-    extends: 0,
-    false: 0,
-    finally: 0,
-    for: 0,
-    function: 0,
-    if: 0,
-    import: 0,
-    in: 0,
-    instanceof: 0,
-    new: 0,
-    null: 0,
-    return: 0,
-    super: 0,
-    switch: 0,
-    this: 0,
-    throw: 0,
-    true: 0,
-    try: 0,
-    typeof: 0,
-    var: 0,
-    void: 0,
-    while: 0,
-    with: 0
+    "default": 0,
+    "delete": 0,
+    "do": 0,
+    "else": 0,
+    "enum": 0,
+    "export": 0,
+    "extends": 0,
+    "false": 0,
+    "finally": 0,
+    "for": 0,
+    "function": 0,
+    "if": 0,
+    "import": 0,
+    "in": 0,
+    "instanceof": 0,
+    "new": 0,
+    "null": 0,
+    "return": 0,
+    "super": 0,
+    "switch": 0,
+    "this": 0,
+    "throw": 0,
+    "true": 0,
+    "try": 0,
+    "typeof": 0,
+    "var": 0,
+    "void": 0,
+    "while": 0,
+    "with": 0
 };
 var bigClass = (function () {
     function bigClass() {
@@ -401,43 +401,43 @@ var bigClass = (function () {
         this.string = 0;
         this.get = 0;
         this.yield = 0;
-        this.break = 0;
-        this.case = 0;
-        this.catch = 0;
-        this.class = 0;
-        this.continue = 0;
-        this.const = 0;
-        this.debugger = 0;
+        this["break"] = 0;
+        this["case"] = 0;
+        this["catch"] = 0;
+        this["class"] = 0;
+        this["continue"] = 0;
+        this["const"] = 0;
+        this["debugger"] = 0;
         this.declare = 0;
-        this.default = 0;
-        this.delete = 0;
-        this.do = 0;
-        this.else = 0;
-        this.enum = 0;
-        this.export = 0;
-        this.extends = 0;
-        this.false = 0;
-        this.finally = 0;
-        this.for = 0;
-        this.function = 0;
-        this.if = 0;
-        this.import = 0;
-        this.in = 0;
-        this.instanceof = 0;
-        this.new = 0;
-        this.null = 0;
-        this.return = 0;
-        this.super = 0;
-        this.switch = 0;
-        this.this = 0;
-        this.throw = 0;
-        this.true = 0;
-        this.try = 0;
-        this.typeof = 0;
-        this.var = 0;
-        this.void = 0;
-        this.while = 0;
-        this.with = 0;
+        this["default"] = 0;
+        this["delete"] = 0;
+        this["do"] = 0;
+        this["else"] = 0;
+        this["enum"] = 0;
+        this["export"] = 0;
+        this["extends"] = 0;
+        this["false"] = 0;
+        this["finally"] = 0;
+        this["for"] = 0;
+        this["function"] = 0;
+        this["if"] = 0;
+        this["import"] = 0;
+        this["in"] = 0;
+        this["instanceof"] = 0;
+        this["new"] = 0;
+        this["null"] = 0;
+        this["return"] = 0;
+        this["super"] = 0;
+        this["switch"] = 0;
+        this["this"] = 0;
+        this["throw"] = 0;
+        this["true"] = 0;
+        this["try"] = 0;
+        this["typeof"] = 0;
+        this["var"] = 0;
+        this["void"] = 0;
+        this["while"] = 0;
+        this["with"] = 0;
     }
     return bigClass;
 }());
diff --git a/tests/baselines/reference/destructuringParameterDeclaration6.js b/tests/baselines/reference/destructuringParameterDeclaration6.js
index ad86b2983b3..03307415b65 100644
--- a/tests/baselines/reference/destructuringParameterDeclaration6.js
+++ b/tests/baselines/reference/destructuringParameterDeclaration6.js
@@ -27,7 +27,7 @@ b2({ while: 1 });
 "use strict";
 // Error
 function a(_a) {
-    var  = _a.while;
+    var  = _a["while"];
 }
 function a1(_a) {
     var public = _a.public;
@@ -56,13 +56,13 @@ function a7() {
         a[_i - 0] = arguments[_i];
     }
 }
-a({ while: 1 });
+a({ "while": 1 });
 // No Error
 function b1(_a) {
     var x = _a.public;
 }
 function b2(_a) {
-    var y = _a.while;
+    var y = _a["while"];
 }
 b1({ public: 1 });
-b2({ while: 1 });
+b2({ "while": 1 });
diff --git a/tests/baselines/reference/es6ClassTest5.js b/tests/baselines/reference/es6ClassTest5.js
index b909fac58b5..7d4238fda65 100644
--- a/tests/baselines/reference/es6ClassTest5.js
+++ b/tests/baselines/reference/es6ClassTest5.js
@@ -23,7 +23,7 @@ var C1T5 = (function () {
 }());
 var bigClass = (function () {
     function bigClass() {
-        this.break = 1;
+        this["break"] = 1;
     }
     return bigClass;
 }());
diff --git a/tests/baselines/reference/fatarrowfunctionsErrors.js b/tests/baselines/reference/fatarrowfunctionsErrors.js
index 2ac20f1966a..ced4660d8d1 100644
--- a/tests/baselines/reference/fatarrowfunctionsErrors.js
+++ b/tests/baselines/reference/fatarrowfunctionsErrors.js
@@ -20,7 +20,7 @@ foo(function () {
     }
     return 0;
 });
-foo((1), { return: 0 });
+foo((1), { "return": 0 });
 foo(function (x) { return x; });
 foo(function (x) {
     if (x === void 0) { x = 0; }
diff --git a/tests/baselines/reference/keywordField.js b/tests/baselines/reference/keywordField.js
index 581d5afa14a..a146cffade8 100644
--- a/tests/baselines/reference/keywordField.js
+++ b/tests/baselines/reference/keywordField.js
@@ -12,7 +12,7 @@ var q = a["if"];
 
 //// [keywordField.js]
 var obj = {};
-obj.if = 1;
-var a = { if: "test" };
-var n = a.if;
+obj["if"] = 1;
+var a = { "if": "test" };
+var n = a["if"];
 var q = a["if"];
diff --git a/tests/baselines/reference/keywordInJsxIdentifier.js b/tests/baselines/reference/keywordInJsxIdentifier.js
index 6009e1980e6..d9c3b51e9a3 100644
--- a/tests/baselines/reference/keywordInJsxIdentifier.js
+++ b/tests/baselines/reference/keywordInJsxIdentifier.js
@@ -9,6 +9,6 @@ declare var React: any;
 
 //// [keywordInJsxIdentifier.js]
 React.createElement("foo", { "class-id": true });
-React.createElement("foo", { class: true });
+React.createElement("foo", { "class": true });
 React.createElement("foo", { "class-id": "1" });
-React.createElement("foo", { class: "1" });
+React.createElement("foo", { "class": "1" });
diff --git a/tests/baselines/reference/nestedClassDeclaration.js b/tests/baselines/reference/nestedClassDeclaration.js
index 04e2f6348ef..cc300ec75a3 100644
--- a/tests/baselines/reference/nestedClassDeclaration.js
+++ b/tests/baselines/reference/nestedClassDeclaration.js
@@ -38,5 +38,5 @@ function foo() {
     }());
 }
 var x = {
-    class: C4
+    "class": C4
 }, _a = void 0;
diff --git a/tests/baselines/reference/objectBindingPatternKeywordIdentifiers01.js b/tests/baselines/reference/objectBindingPatternKeywordIdentifiers01.js
index cd339bb5907..a905e53f221 100644
--- a/tests/baselines/reference/objectBindingPatternKeywordIdentifiers01.js
+++ b/tests/baselines/reference/objectBindingPatternKeywordIdentifiers01.js
@@ -3,4 +3,4 @@
 var { while } = { while: 1 }
 
 //// [objectBindingPatternKeywordIdentifiers01.js]
-var  = { while: 1 }.while;
+var  = { "while": 1 }["while"];
diff --git a/tests/baselines/reference/objectBindingPatternKeywordIdentifiers02.js b/tests/baselines/reference/objectBindingPatternKeywordIdentifiers02.js
index 0286a78ba82..5bc6e1f9963 100644
--- a/tests/baselines/reference/objectBindingPatternKeywordIdentifiers02.js
+++ b/tests/baselines/reference/objectBindingPatternKeywordIdentifiers02.js
@@ -3,4 +3,4 @@
 var { while: while } = { while: 1 }
 
 //// [objectBindingPatternKeywordIdentifiers02.js]
-var _a = { while: 1 },  = _a.while,  = _a.while;
+var _a = { "while": 1 },  = _a["while"],  = _a["while"];
diff --git a/tests/baselines/reference/objectBindingPatternKeywordIdentifiers03.js b/tests/baselines/reference/objectBindingPatternKeywordIdentifiers03.js
index 4bbb1afb4cb..3d8643d63ce 100644
--- a/tests/baselines/reference/objectBindingPatternKeywordIdentifiers03.js
+++ b/tests/baselines/reference/objectBindingPatternKeywordIdentifiers03.js
@@ -3,4 +3,4 @@
 var { "while" } = { while: 1 }
 
 //// [objectBindingPatternKeywordIdentifiers03.js]
-var  = { while: 1 }["while"];
+var  = { "while": 1 }["while"];
diff --git a/tests/baselines/reference/objectBindingPatternKeywordIdentifiers04.js b/tests/baselines/reference/objectBindingPatternKeywordIdentifiers04.js
index 4e53b13c0a6..de7608a77d2 100644
--- a/tests/baselines/reference/objectBindingPatternKeywordIdentifiers04.js
+++ b/tests/baselines/reference/objectBindingPatternKeywordIdentifiers04.js
@@ -3,4 +3,4 @@
 var { "while": while } = { while: 1 }
 
 //// [objectBindingPatternKeywordIdentifiers04.js]
-var _a = { while: 1 },  = _a["while"],  = _a.while;
+var _a = { "while": 1 },  = _a["while"],  = _a["while"];
diff --git a/tests/baselines/reference/objectLiteralShorthandPropertiesErrorFromNotUsingIdentifier.js b/tests/baselines/reference/objectLiteralShorthandPropertiesErrorFromNotUsingIdentifier.js
index b72f0351b9c..7b9c9f5d328 100644
--- a/tests/baselines/reference/objectLiteralShorthandPropertiesErrorFromNotUsingIdentifier.js
+++ b/tests/baselines/reference/objectLiteralShorthandPropertiesErrorFromNotUsingIdentifier.js
@@ -27,15 +27,15 @@ var y = {
     42: ,
     get e() { },
     set f() { },
-    this: ,
-    super: ,
-    var: ,
-    class: ,
-    typeof: 
+    "this": ,
+    "super": ,
+    "var": ,
+    "class": ,
+    "typeof": 
 };
 var x = {
     a: .b,
     a: ["ss"],
     a: [1]
 };
-var v = { class:  }; // error
+var v = { "class":  }; // error
diff --git a/tests/baselines/reference/objectTypesIdentityWithConstructSignatures2.js b/tests/baselines/reference/objectTypesIdentityWithConstructSignatures2.js
index 315e079d429..0a422dbda6f 100644
--- a/tests/baselines/reference/objectTypesIdentityWithConstructSignatures2.js
+++ b/tests/baselines/reference/objectTypesIdentityWithConstructSignatures2.js
@@ -91,7 +91,7 @@ var C = (function () {
     return C;
 }());
 var a;
-var b = { new: function (x) { return ''; } }; // not a construct signature, function called new
+var b = { "new": function (x) { return ''; } }; // not a construct signature, function called new
 function foo1b(x) { }
 function foo1c(x) { }
 function foo2(x) { }
diff --git a/tests/baselines/reference/objectTypesIdentityWithConstructSignaturesDifferingParamCounts.js b/tests/baselines/reference/objectTypesIdentityWithConstructSignaturesDifferingParamCounts.js
index a61bedfd52f..5fa148b541d 100644
--- a/tests/baselines/reference/objectTypesIdentityWithConstructSignaturesDifferingParamCounts.js
+++ b/tests/baselines/reference/objectTypesIdentityWithConstructSignaturesDifferingParamCounts.js
@@ -91,7 +91,7 @@ var C = (function () {
     return C;
 }());
 var a;
-var b = { new: function (x) { return ''; } }; // not a construct signature, function called new
+var b = { "new": function (x) { return ''; } }; // not a construct signature, function called new
 function foo1b(x) { }
 function foo1c(x) { }
 function foo2(x) { }
diff --git a/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesDifferingByConstraints.js b/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesDifferingByConstraints.js
index c15c53b9bf8..6a66e8bbda3 100644
--- a/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesDifferingByConstraints.js
+++ b/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesDifferingByConstraints.js
@@ -92,7 +92,7 @@ var C = (function () {
     return C;
 }());
 var a;
-var b = { new: function (x) { return ''; } }; // not a construct signature, function called new
+var b = { "new": function (x) { return ''; } }; // not a construct signature, function called new
 function foo1b(x) { }
 function foo1c(x) { }
 function foo2(x) { }
diff --git a/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesDifferingByConstraints2.js b/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesDifferingByConstraints2.js
index f8aff596dc9..e19837a9f7f 100644
--- a/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesDifferingByConstraints2.js
+++ b/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesDifferingByConstraints2.js
@@ -109,7 +109,7 @@ var D = (function () {
     return D;
 }());
 var a;
-var b = { new: function (x, y) { return ''; } }; // not a construct signature, function called new
+var b = { "new": function (x, y) { return ''; } }; // not a construct signature, function called new
 function foo1b(x) { }
 function foo1c(x) { }
 function foo2(x) { }
diff --git a/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesDifferingByConstraints3.js b/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesDifferingByConstraints3.js
index 141aa86823b..735c5bdc2d6 100644
--- a/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesDifferingByConstraints3.js
+++ b/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesDifferingByConstraints3.js
@@ -128,7 +128,7 @@ var D = (function () {
     return D;
 }());
 var a;
-var b = { new: function (x, y) { return ''; } }; // not a construct signature, function called new
+var b = { "new": function (x, y) { return ''; } }; // not a construct signature, function called new
 function foo1b(x) { }
 function foo1c(x) { }
 function foo2(x) { }
diff --git a/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesDifferingByReturnType.js b/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesDifferingByReturnType.js
index b651d368f33..6eab84a49dd 100644
--- a/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesDifferingByReturnType.js
+++ b/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesDifferingByReturnType.js
@@ -99,7 +99,7 @@ var C = (function () {
     return C;
 }());
 var a;
-var b = { new: function (x) { return null; } }; // not a construct signature, function called new
+var b = { "new": function (x) { return null; } }; // not a construct signature, function called new
 function foo1b(x) { }
 function foo1c(x) { }
 function foo2(x) { }
diff --git a/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesDifferingByReturnType2.js b/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesDifferingByReturnType2.js
index ff7095c4ea1..d927a8e082a 100644
--- a/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesDifferingByReturnType2.js
+++ b/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesDifferingByReturnType2.js
@@ -95,7 +95,7 @@ var C = (function () {
     return C;
 }());
 var a;
-var b = { new: function (x) { return null; } }; // not a construct signature, function called new
+var b = { "new": function (x) { return null; } }; // not a construct signature, function called new
 function foo1b(x) { }
 function foo1c(x) { }
 function foo2(x) { }
diff --git a/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesDifferingTypeParameterCounts.js b/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesDifferingTypeParameterCounts.js
index 314eb700c4b..512bebb3b0e 100644
--- a/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesDifferingTypeParameterCounts.js
+++ b/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesDifferingTypeParameterCounts.js
@@ -87,7 +87,7 @@ var C = (function () {
     return C;
 }());
 var a;
-var b = { new: function (x) { return x; } };
+var b = { "new": function (x) { return x; } };
 function foo1b(x) { }
 function foo1c(x) { }
 function foo2(x) { }
diff --git a/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesDifferingTypeParameterNames.js b/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesDifferingTypeParameterNames.js
index 182cf8263b7..80cfcd23ec9 100644
--- a/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesDifferingTypeParameterNames.js
+++ b/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesDifferingTypeParameterNames.js
@@ -87,7 +87,7 @@ var C = (function () {
     return C;
 }());
 var a;
-var b = { new: function (x) { return new C(x); } };
+var b = { "new": function (x) { return new C(x); } };
 function foo1b(x) { }
 function foo1c(x) { }
 function foo2(x) { }
diff --git a/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesOptionalParams.js b/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesOptionalParams.js
index 5c5dd26c331..87cb0b33531 100644
--- a/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesOptionalParams.js
+++ b/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesOptionalParams.js
@@ -91,7 +91,7 @@ var C = (function () {
     return C;
 }());
 var a;
-var b = { new: function (x, y) { return new C(x, y); } }; // not a construct signature, function called new
+var b = { "new": function (x, y) { return new C(x, y); } }; // not a construct signature, function called new
 function foo1b(x) { }
 function foo1c(x) { }
 function foo2(x) { }
diff --git a/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesOptionalParams2.js b/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesOptionalParams2.js
index 14b2ec3c0ca..6b0e91f817f 100644
--- a/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesOptionalParams2.js
+++ b/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesOptionalParams2.js
@@ -91,7 +91,7 @@ var C = (function () {
     return C;
 }());
 var a;
-var b = { new: function (x, y) { return new C(x, y); } }; // not a construct signature, function called new
+var b = { "new": function (x, y) { return new C(x, y); } }; // not a construct signature, function called new
 function foo1b(x) { }
 function foo1c(x) { }
 function foo2(x) { }
diff --git a/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesOptionalParams3.js b/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesOptionalParams3.js
index ffc238cacae..55f2a0217e9 100644
--- a/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesOptionalParams3.js
+++ b/tests/baselines/reference/objectTypesIdentityWithGenericConstructSignaturesOptionalParams3.js
@@ -91,7 +91,7 @@ var C = (function () {
     return C;
 }());
 var a;
-var b = { new: function (x, y) { return new C(x, y); } }; // not a construct signature, function called new
+var b = { "new": function (x, y) { return new C(x, y); } }; // not a construct signature, function called new
 function foo1b(x) { }
 function foo1c(x) { }
 function foo2(x) { }
diff --git a/tests/baselines/reference/parserErrorRecovery_ObjectLiteral2.js b/tests/baselines/reference/parserErrorRecovery_ObjectLiteral2.js
index 6a703759fff..c206a30237a 100644
--- a/tests/baselines/reference/parserErrorRecovery_ObjectLiteral2.js
+++ b/tests/baselines/reference/parserErrorRecovery_ObjectLiteral2.js
@@ -4,4 +4,4 @@ return;
 
 //// [parserErrorRecovery_ObjectLiteral2.js]
 var v = { a: ,
-    return:  };
+    "return":  };
diff --git a/tests/baselines/reference/parserErrorRecovery_ObjectLiteral3.js b/tests/baselines/reference/parserErrorRecovery_ObjectLiteral3.js
index eecf45fea4f..6cee2b42725 100644
--- a/tests/baselines/reference/parserErrorRecovery_ObjectLiteral3.js
+++ b/tests/baselines/reference/parserErrorRecovery_ObjectLiteral3.js
@@ -4,4 +4,4 @@ return;
 
 //// [parserErrorRecovery_ObjectLiteral3.js]
 var v = { a: ,
-    return:  };
+    "return":  };
diff --git a/tests/baselines/reference/parserErrorRecovery_ObjectLiteral4.js b/tests/baselines/reference/parserErrorRecovery_ObjectLiteral4.js
index 87a1a31437e..23d17c8047b 100644
--- a/tests/baselines/reference/parserErrorRecovery_ObjectLiteral4.js
+++ b/tests/baselines/reference/parserErrorRecovery_ObjectLiteral4.js
@@ -4,4 +4,4 @@ return;
 
 //// [parserErrorRecovery_ObjectLiteral4.js]
 var v = { a: 1,
-    return:  };
+    "return":  };
diff --git a/tests/baselines/reference/parserErrorRecovery_ObjectLiteral5.js b/tests/baselines/reference/parserErrorRecovery_ObjectLiteral5.js
index 97e618946a0..7b83132bf0f 100644
--- a/tests/baselines/reference/parserErrorRecovery_ObjectLiteral5.js
+++ b/tests/baselines/reference/parserErrorRecovery_ObjectLiteral5.js
@@ -4,4 +4,4 @@ return;
 
 //// [parserErrorRecovery_ObjectLiteral5.js]
 var v = { a: 1,
-    return:  };
+    "return":  };
diff --git a/tests/baselines/reference/parserExportAsFunctionIdentifier.js b/tests/baselines/reference/parserExportAsFunctionIdentifier.js
index 7ed76bb87d9..62429c76855 100644
--- a/tests/baselines/reference/parserExportAsFunctionIdentifier.js
+++ b/tests/baselines/reference/parserExportAsFunctionIdentifier.js
@@ -9,4 +9,4 @@ var x = f.export();
 
 //// [parserExportAsFunctionIdentifier.js]
 var f;
-var x = f.export();
+var x = f["export"]();
diff --git a/tests/baselines/reference/parserKeywordsAsIdentifierName1.js b/tests/baselines/reference/parserKeywordsAsIdentifierName1.js
index c0c8c844364..a717abcc08b 100644
--- a/tests/baselines/reference/parserKeywordsAsIdentifierName1.js
+++ b/tests/baselines/reference/parserKeywordsAsIdentifierName1.js
@@ -8,7 +8,7 @@ var big = {
 
 //// [parserKeywordsAsIdentifierName1.js]
 var big = {
-    break: 0,
-    super: 0,
-    const: 0
+    "break": 0,
+    "super": 0,
+    "const": 0
 };
diff --git a/tests/baselines/reference/parserShorthandPropertyAssignment2.js b/tests/baselines/reference/parserShorthandPropertyAssignment2.js
index 0de0fa3829f..95d2f32ffad 100644
--- a/tests/baselines/reference/parserShorthandPropertyAssignment2.js
+++ b/tests/baselines/reference/parserShorthandPropertyAssignment2.js
@@ -2,4 +2,4 @@
 var v = { class };
 
 //// [parserShorthandPropertyAssignment2.js]
-var v = { class:  };
+var v = { "class":  };
diff --git a/tests/baselines/reference/parserSuperExpression3.js b/tests/baselines/reference/parserSuperExpression3.js
index f311efcd0f6..064353669c8 100644
--- a/tests/baselines/reference/parserSuperExpression3.js
+++ b/tests/baselines/reference/parserSuperExpression3.js
@@ -10,7 +10,7 @@ var C = (function () {
     function C() {
     }
     C.prototype.M = function () {
-        this.super(0);
+        this["super"](0);
     };
     return C;
 }());
diff --git a/tests/baselines/reference/prototypeOnConstructorFunctions.js b/tests/baselines/reference/prototypeOnConstructorFunctions.js
index d2e5ddde925..de1fec1f7e8 100644
--- a/tests/baselines/reference/prototypeOnConstructorFunctions.js
+++ b/tests/baselines/reference/prototypeOnConstructorFunctions.js
@@ -12,4 +12,4 @@ i.const.prototype.prop = "yo";
 
 //// [prototypeOnConstructorFunctions.js]
 var i;
-i.const.prototype.prop = "yo";
+i["const"].prototype.prop = "yo";
diff --git a/tests/baselines/reference/reservedWords.js b/tests/baselines/reference/reservedWords.js
index 12fbcae0c65..3424c054181 100644
--- a/tests/baselines/reference/reservedWords.js
+++ b/tests/baselines/reference/reservedWords.js
@@ -19,16 +19,16 @@ var obj2 = {
 
 //// [reservedWords.js]
 var obj = {
-    if: 0,
-    debugger: 2,
-    break: 3,
-    function: 4
+    "if": 0,
+    "debugger": 2,
+    "break": 3,
+    "function": 4
 };
 //This compiles.
 var obj2 = {
-    if: 0,
-    while: 1,
-    debugger: 2,
-    break: 3,
-    function: 4
+    "if": 0,
+    "while": 1,
+    "debugger": 2,
+    "break": 3,
+    "function": 4
 };
diff --git a/tests/baselines/reference/reservedWords2.js b/tests/baselines/reference/reservedWords2.js
index a79a0564c78..d9c8105c35f 100644
--- a/tests/baselines/reference/reservedWords2.js
+++ b/tests/baselines/reference/reservedWords2.js
@@ -27,8 +27,8 @@ function () { }
 throw function () { };
 module;
 void {};
-var _a = { while: 1, return: 2 },  = _a.while,  = _a.return;
-var _b = { this: 1, switch: { continue: 2 } },  = _b.this,  = _b.switch.continue;
+var _a = { "while": 1, "return": 2 },  = _a["while"],  = _a["return"];
+var _b = { "this": 1, "switch": { "continue": 2 } },  = _b["this"],  = _b["switch"]["continue"];
 var _c = void 0;
 debugger;
 if ()
diff --git a/tests/baselines/reference/super1.js b/tests/baselines/reference/super1.js
index 9f1289dce55..0094f696faf 100644
--- a/tests/baselines/reference/super1.js
+++ b/tests/baselines/reference/super1.js
@@ -97,7 +97,7 @@ var SubSub1 = (function (_super) {
         return _super.apply(this, arguments) || this;
     }
     SubSub1.prototype.bar = function () {
-        return _super.prototype.super.foo;
+        return _super.prototype["super"].foo;
     };
     return SubSub1;
 }(Sub1));
diff --git a/tests/baselines/reference/tsxReactEmitNesting.js b/tests/baselines/reference/tsxReactEmitNesting.js
index 29e948f687b..eaee315c340 100644
--- a/tests/baselines/reference/tsxReactEmitNesting.js
+++ b/tests/baselines/reference/tsxReactEmitNesting.js
@@ -38,21 +38,21 @@ let render = (ctrl, model) =>
 //// [file.js]
 // A simple render function with nesting and control statements
 var render = function (ctrl, model) {
-    return vdom.createElement("section", { class: "todoapp" },
-        vdom.createElement("header", { class: "header" },
+    return vdom.createElement("section", { "class": "todoapp" },
+        vdom.createElement("header", { "class": "header" },
             vdom.createElement("h1", null, "todos <x>"),
-            vdom.createElement("input", { class: "new-todo", autofocus: true, autocomplete: "off", placeholder: "What needs to be done?", value: model.newTodo, onKeyup: ctrl.addTodo.bind(ctrl, model) })),
-        vdom.createElement("section", { class: "main", style: { display: (model.todos && model.todos.length) ? "block" : "none" } },
-            vdom.createElement("input", { class: "toggle-all", type: "checkbox", onChange: ctrl.toggleAll.bind(ctrl) }),
-            vdom.createElement("ul", { class: "todo-list" }, model.filteredTodos.map(function (todo) {
-                return vdom.createElement("li", { class: { todo: true, completed: todo.completed, editing: todo == model.editedTodo } },
-                    vdom.createElement("div", { class: "view" },
+            vdom.createElement("input", { "class": "new-todo", autofocus: true, autocomplete: "off", placeholder: "What needs to be done?", value: model.newTodo, onKeyup: ctrl.addTodo.bind(ctrl, model) })),
+        vdom.createElement("section", { "class": "main", style: { display: (model.todos && model.todos.length) ? "block" : "none" } },
+            vdom.createElement("input", { "class": "toggle-all", type: "checkbox", onChange: ctrl.toggleAll.bind(ctrl) }),
+            vdom.createElement("ul", { "class": "todo-list" }, model.filteredTodos.map(function (todo) {
+                return vdom.createElement("li", { "class": { todo: true, completed: todo.completed, editing: todo == model.editedTodo } },
+                    vdom.createElement("div", { "class": "view" },
                         (!todo.editable) ?
-                            vdom.createElement("input", { class: "toggle", type: "checkbox" })
+                            vdom.createElement("input", { "class": "toggle", type: "checkbox" })
                             : null,
                         vdom.createElement("label", { onDoubleClick: function () { ctrl.editTodo(todo); } }, todo.title),
-                        vdom.createElement("button", { class: "destroy", onClick: ctrl.removeTodo.bind(ctrl, todo) }),
-                        vdom.createElement("div", { class: "iconBorder" },
-                            vdom.createElement("div", { class: "icon" }))));
+                        vdom.createElement("button", { "class": "destroy", onClick: ctrl.removeTodo.bind(ctrl, todo) }),
+                        vdom.createElement("div", { "class": "iconBorder" },
+                            vdom.createElement("div", { "class": "icon" }))));
             }))));
 };
diff --git a/tests/baselines/reference/typeQueryWithReservedWords.js b/tests/baselines/reference/typeQueryWithReservedWords.js
index 7561eeddb75..09c3b642a36 100644
--- a/tests/baselines/reference/typeQueryWithReservedWords.js
+++ b/tests/baselines/reference/typeQueryWithReservedWords.js
@@ -21,9 +21,9 @@ var Controller = (function () {
     }
     Controller.prototype.create = function () {
     };
-    Controller.prototype.delete = function () {
+    Controller.prototype["delete"] = function () {
     };
-    Controller.prototype.var = function () {
+    Controller.prototype["var"] = function () {
     };
     return Controller;
 }());