diff --git a/src/compiler/core.ts b/src/compiler/core.ts
index 1c38222b4b5ee..350272db44a2b 100644
--- a/src/compiler/core.ts
+++ b/src/compiler/core.ts
@@ -1006,21 +1006,6 @@ namespace ts {
         return to;
     }
 
-    /**
-     * Appends a range of value to begin of an array, returning the array.
-     *
-     * @param to The array to which `value` is to be appended. If `to` is `undefined`, a new array
-     * is created if `value` was appended.
-     * @param from The values to append to the array. If `from` is `undefined`, nothing is
-     * appended. If an element of `from` is `undefined`, that element is not appended.
-     */
-    export function prependRange<T>(to: T[], from: ReadonlyArray<T> | undefined): T[] | undefined {
-        if (from === undefined || from.length === 0) return to;
-        if (to === undefined) return from.slice();
-        to.unshift(...from);
-        return to;
-    }
-
     /**
      * @return Whether the value was added.
      */
diff --git a/src/compiler/transformers/es2015.ts b/src/compiler/transformers/es2015.ts
index 3a632bb5ec30a..b05cabcd85ab5 100644
--- a/src/compiler/transformers/es2015.ts
+++ b/src/compiler/transformers/es2015.ts
@@ -529,7 +529,7 @@ namespace ts {
                     createVariableStatement(/*modifiers*/ undefined,
                         createVariableDeclarationList(taggedTemplateStringDeclarations)));
             }
-            prependRange(statements, endLexicalEnvironment());
+            prependStatements(statements, endLexicalEnvironment());
             exitSubtree(ancestorFacts, HierarchyFacts.None, HierarchyFacts.None);
             return updateSourceFileNode(
                 node,
@@ -837,7 +837,7 @@ namespace ts {
             setEmitFlags(statement, EmitFlags.NoComments | EmitFlags.NoTokenSourceMaps);
             statements.push(statement);
 
-            prependRange(statements, endLexicalEnvironment());
+            prependStatements(statements, endLexicalEnvironment());
 
             const block = createBlock(setTextRange(createNodeArray(statements), /*location*/ node.members), /*multiLine*/ true);
             setEmitFlags(block, EmitFlags.NoComments);
@@ -980,7 +980,7 @@ namespace ts {
                 );
             }
 
-            prependRange(statements, endLexicalEnvironment());
+            prependStatements(statements, endLexicalEnvironment());
 
             if (constructor) {
                 prependCaptureNewTargetIfNeeded(statements, constructor, /*copyOnWrite*/ false);
@@ -1896,7 +1896,7 @@ namespace ts {
             }
 
             const lexicalEnvironment = context.endLexicalEnvironment();
-            prependRange(statements, lexicalEnvironment);
+            prependStatements(statements, lexicalEnvironment);
 
             prependCaptureNewTargetIfNeeded(statements, node, /*copyOnWrite*/ false);
 
@@ -2712,7 +2712,7 @@ namespace ts {
                 if (loopOutParameters.length) {
                     copyOutParameters(loopOutParameters, CopyDirection.ToOutParameter, statements);
                 }
-                prependRange(statements, lexicalEnvironment);
+                prependStatements(statements, lexicalEnvironment);
                 loopBody = createBlock(statements, /*multiline*/ true);
             }
 
diff --git a/src/compiler/transformers/es2017.ts b/src/compiler/transformers/es2017.ts
index 8cc9cf3a3a0ed..a118e349ac382 100644
--- a/src/compiler/transformers/es2017.ts
+++ b/src/compiler/transformers/es2017.ts
@@ -413,7 +413,7 @@ namespace ts {
                     )
                 );
 
-                prependRange(statements, endLexicalEnvironment());
+                prependStatements(statements, endLexicalEnvironment());
 
                 const block = createBlock(statements, /*multiLine*/ true);
                 setTextRange(block, node.body);
diff --git a/src/compiler/transformers/esnext.ts b/src/compiler/transformers/esnext.ts
index a1d6631072fab..a0ab03a973112 100644
--- a/src/compiler/transformers/esnext.ts
+++ b/src/compiler/transformers/esnext.ts
@@ -663,7 +663,7 @@ namespace ts {
                 )
             );
 
-            prependRange(statements, endLexicalEnvironment());
+            prependStatements(statements, endLexicalEnvironment());
             const block = updateBlock(node.body!, statements);
 
             // Minor optimization, emit `_super` helper to capture `super` access in an arrow.
@@ -695,7 +695,7 @@ namespace ts {
             const leadingStatements = endLexicalEnvironment();
             if (statementOffset > 0 || some(statements) || some(leadingStatements)) {
                 const block = convertToFunctionBody(body, /*multiLine*/ true);
-                prependRange(statements, leadingStatements);
+                prependStatements(statements, leadingStatements);
                 addRange(statements, block.statements.slice(statementOffset));
                 return updateBlock(block, setTextRange(createNodeArray(statements), block.statements));
             }
diff --git a/src/compiler/transformers/generators.ts b/src/compiler/transformers/generators.ts
index f796d64d03d74..4752f4e4574f1 100644
--- a/src/compiler/transformers/generators.ts
+++ b/src/compiler/transformers/generators.ts
@@ -587,7 +587,7 @@ namespace ts {
             transformAndEmitStatements(body.statements, statementOffset);
 
             const buildResult = build();
-            prependRange(statements, endLexicalEnvironment());
+            prependStatements(statements, endLexicalEnvironment());
             statements.push(createReturn(buildResult));
 
             // Restore previous generator state
diff --git a/src/compiler/transformers/module/module.ts b/src/compiler/transformers/module/module.ts
index 86d0a6bc9527d..50595d960e1af 100644
--- a/src/compiler/transformers/module/module.ts
+++ b/src/compiler/transformers/module/module.ts
@@ -97,7 +97,7 @@ namespace ts {
             append(statements, visitNode(currentModuleInfo.externalHelpersImportDeclaration, sourceElementVisitor, isStatement));
             addRange(statements, visitNodes(node.statements, sourceElementVisitor, isStatement, statementOffset));
             addExportEqualsIfNeeded(statements, /*emitAsReturn*/ false);
-            prependRange(statements, endLexicalEnvironment());
+            prependStatements(statements, endLexicalEnvironment());
 
             const updated = updateSourceFileNode(node, setTextRange(createNodeArray(statements), node.statements));
             if (currentModuleInfo.hasExportStarsToExportValues && !compilerOptions.importHelpers) {
@@ -426,7 +426,7 @@ namespace ts {
 
             // End the lexical environment for the module body
             // and merge any new lexical declarations.
-            prependRange(statements, endLexicalEnvironment());
+            prependStatements(statements, endLexicalEnvironment());
 
             const body = createBlock(statements, /*multiLine*/ true);
             if (currentModuleInfo.hasExportStarsToExportValues && !compilerOptions.importHelpers) {
diff --git a/src/compiler/transformers/module/system.ts b/src/compiler/transformers/module/system.ts
index 4ff4d5b4e7fc0..9cad3cbb97c26 100644
--- a/src/compiler/transformers/module/system.ts
+++ b/src/compiler/transformers/module/system.ts
@@ -257,7 +257,7 @@ namespace ts {
             // We emit hoisted variables early to align roughly with our previous emit output.
             // Two key differences in this approach are:
             // - Temporary variables will appear at the top rather than at the bottom of the file
-            prependRange(statements, endLexicalEnvironment());
+            prependStatements(statements, endLexicalEnvironment());
 
             const exportStarFunction = addExportStarIfNeeded(statements)!; // TODO: GH#18217
             const moduleObject = createObjectLiteral([
diff --git a/src/compiler/transformers/ts.ts b/src/compiler/transformers/ts.ts
index 4198de8d0dba1..5ae6bcb8b3234 100644
--- a/src/compiler/transformers/ts.ts
+++ b/src/compiler/transformers/ts.ts
@@ -669,7 +669,7 @@ namespace ts {
                 setEmitFlags(statement, EmitFlags.NoComments | EmitFlags.NoTokenSourceMaps);
                 statements.push(statement);
 
-                prependRange(statements, context.endLexicalEnvironment());
+                prependStatements(statements, context.endLexicalEnvironment());
 
                 const iife = createImmediatelyInvokedArrowFunction(statements);
                 setEmitFlags(iife, EmitFlags.TypeScriptClassWrapper);
@@ -2693,7 +2693,7 @@ namespace ts {
             const statements: Statement[] = [];
             startLexicalEnvironment();
             const members = map(node.members, transformEnumMember);
-            prependRange(statements, endLexicalEnvironment());
+            prependStatements(statements, endLexicalEnvironment());
             addRange(statements, members);
 
             currentNamespaceContainerName = savedCurrentNamespaceLocalName;
@@ -3008,7 +3008,7 @@ namespace ts {
                 statementsLocation = moveRangePos(moduleBlock.statements, -1);
             }
 
-            prependRange(statements, endLexicalEnvironment());
+            prependStatements(statements, endLexicalEnvironment());
             currentNamespaceContainerName = savedCurrentNamespaceContainerName;
             currentNamespace = savedCurrentNamespace;
             currentScopeFirstDeclarationsOfName = savedCurrentScopeFirstDeclarationsOfName;
diff --git a/src/compiler/utilities.ts b/src/compiler/utilities.ts
index d25d41e6bbaff..a3da44c5b1fea 100644
--- a/src/compiler/utilities.ts
+++ b/src/compiler/utilities.ts
@@ -254,6 +254,25 @@ namespace ts {
         return !nodeIsMissing(node);
     }
 
+    /**
+     * Appends a range of value to begin of an array, returning the array.
+     *
+     * @param to The array to which `value` is to be appended. If `to` is `undefined`, a new array
+     * is created if `value` was appended.
+     * @param from The values to append to the array. If `from` is `undefined`, nothing is
+     * appended. If an element of `from` is `undefined`, that element is not appended.
+     */
+    export function prependStatements<T extends Statement>(to: T[], from: ReadonlyArray<T> | undefined): T[] | undefined {
+        if (from === undefined || from.length === 0) return to;
+        if (to === undefined) return from.slice();
+        const prologue = to.length && isPrologueDirective(to[0]) && to.shift();
+        to.unshift(...from);
+        if (prologue) {
+            to.unshift(prologue);
+        }
+        return to;
+    }
+
     /**
      * Determine if the given comment is a triple-slash
      *
diff --git a/src/compiler/visitor.ts b/src/compiler/visitor.ts
index 1b9853e9f860e..5f35a3027dc56 100644
--- a/src/compiler/visitor.ts
+++ b/src/compiler/visitor.ts
@@ -1469,7 +1469,7 @@ namespace ts {
 
         return isNodeArray(statements)
             ? setTextRange(createNodeArray(concatenate(declarations, statements)), statements)
-            : prependRange(statements, declarations);
+            : prependStatements(statements, declarations);
     }
 
     /**
diff --git a/tests/baselines/reference/SystemModuleForStatementNoInitializer.js b/tests/baselines/reference/SystemModuleForStatementNoInitializer.js
index 059e6175b3055..ff31b3c73e284 100644
--- a/tests/baselines/reference/SystemModuleForStatementNoInitializer.js
+++ b/tests/baselines/reference/SystemModuleForStatementNoInitializer.js
@@ -19,8 +19,8 @@ for (; ;) {
 
 //// [SystemModuleForStatementNoInitializer.js]
 System.register([], function (exports_1, context_1) {
-    var i, limit;
     "use strict";
+    var i, limit;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
diff --git a/tests/baselines/reference/aliasesInSystemModule1.js b/tests/baselines/reference/aliasesInSystemModule1.js
index 340a8f53e3c7c..468ff805b2dde 100644
--- a/tests/baselines/reference/aliasesInSystemModule1.js
+++ b/tests/baselines/reference/aliasesInSystemModule1.js
@@ -17,8 +17,8 @@ module M {
 
 //// [aliasesInSystemModule1.js]
 System.register(["foo"], function (exports_1, context_1) {
-    var alias, cls, cls2, x, y, z, M;
     "use strict";
+    var alias, cls, cls2, x, y, z, M;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [
diff --git a/tests/baselines/reference/aliasesInSystemModule2.js b/tests/baselines/reference/aliasesInSystemModule2.js
index 88875297b2fb2..af7208d5c99ec 100644
--- a/tests/baselines/reference/aliasesInSystemModule2.js
+++ b/tests/baselines/reference/aliasesInSystemModule2.js
@@ -16,8 +16,8 @@ module M {
 
 //// [aliasesInSystemModule2.js]
 System.register(["foo"], function (exports_1, context_1) {
-    var foo_1, cls, cls2, x, y, z, M;
     "use strict";
+    var foo_1, cls, cls2, x, y, z, M;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [
diff --git a/tests/baselines/reference/allowSyntheticDefaultImports2.js b/tests/baselines/reference/allowSyntheticDefaultImports2.js
index 2ab6ae38c1308..ea83065c884f4 100644
--- a/tests/baselines/reference/allowSyntheticDefaultImports2.js
+++ b/tests/baselines/reference/allowSyntheticDefaultImports2.js
@@ -11,8 +11,8 @@ export class Foo {
 
 //// [a.js]
 System.register(["./b"], function (exports_1, context_1) {
-    var b_1, x;
     "use strict";
+    var b_1, x;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [
diff --git a/tests/baselines/reference/allowSyntheticDefaultImports3.js b/tests/baselines/reference/allowSyntheticDefaultImports3.js
index 0e8207eaf26dd..d7eca3ead884d 100644
--- a/tests/baselines/reference/allowSyntheticDefaultImports3.js
+++ b/tests/baselines/reference/allowSyntheticDefaultImports3.js
@@ -12,8 +12,8 @@ export class Foo {
 
 //// [b.js]
 System.register([], function (exports_1, context_1) {
-    var Foo;
     "use strict";
+    var Foo;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
@@ -29,8 +29,8 @@ System.register([], function (exports_1, context_1) {
 });
 //// [a.js]
 System.register(["./b"], function (exports_1, context_1) {
-    var b_1, x;
     "use strict";
+    var b_1, x;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [
diff --git a/tests/baselines/reference/allowSyntheticDefaultImports5.js b/tests/baselines/reference/allowSyntheticDefaultImports5.js
index 0ca15c82cde07..81de76c395fd4 100644
--- a/tests/baselines/reference/allowSyntheticDefaultImports5.js
+++ b/tests/baselines/reference/allowSyntheticDefaultImports5.js
@@ -13,8 +13,8 @@ export var x = new Foo();
 
 //// [a.js]
 System.register(["./b"], function (exports_1, context_1) {
-    var b_1, x;
     "use strict";
+    var b_1, x;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [
diff --git a/tests/baselines/reference/allowSyntheticDefaultImports6.js b/tests/baselines/reference/allowSyntheticDefaultImports6.js
index 1d19b3fb46ce2..7d351b6508177 100644
--- a/tests/baselines/reference/allowSyntheticDefaultImports6.js
+++ b/tests/baselines/reference/allowSyntheticDefaultImports6.js
@@ -13,8 +13,8 @@ export var x = new Foo();
 
 //// [a.js]
 System.register(["./b"], function (exports_1, context_1) {
-    var b_1, x;
     "use strict";
+    var b_1, x;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [
diff --git a/tests/baselines/reference/allowSyntheticDefaultImports7.js b/tests/baselines/reference/allowSyntheticDefaultImports7.js
index 6a3d45ba59e49..39e6c2ae5e033 100644
--- a/tests/baselines/reference/allowSyntheticDefaultImports7.js
+++ b/tests/baselines/reference/allowSyntheticDefaultImports7.js
@@ -12,8 +12,8 @@ Foo.foo();
 
 //// [a.js]
 System.register(["./b"], function (exports_1, context_1) {
-    var b_1;
     "use strict";
+    var b_1;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [
diff --git a/tests/baselines/reference/allowSyntheticDefaultImports8.js b/tests/baselines/reference/allowSyntheticDefaultImports8.js
index dff56737805a3..e1157b8297a24 100644
--- a/tests/baselines/reference/allowSyntheticDefaultImports8.js
+++ b/tests/baselines/reference/allowSyntheticDefaultImports8.js
@@ -12,8 +12,8 @@ Foo.foo();
 
 //// [a.js]
 System.register(["./b"], function (exports_1, context_1) {
-    var b_1;
     "use strict";
+    var b_1;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [
diff --git a/tests/baselines/reference/anonymousDefaultExportsSystem.js b/tests/baselines/reference/anonymousDefaultExportsSystem.js
index bc3d35cda9087..48071da9e9b47 100644
--- a/tests/baselines/reference/anonymousDefaultExportsSystem.js
+++ b/tests/baselines/reference/anonymousDefaultExportsSystem.js
@@ -8,8 +8,8 @@ export default function() {}
 
 //// [a.js]
 System.register([], function (exports_1, context_1) {
-    var default_1;
     "use strict";
+    var default_1;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
diff --git a/tests/baselines/reference/capturedLetConstInLoop4.js b/tests/baselines/reference/capturedLetConstInLoop4.js
index 874a1d4130e83..ff6d32563a932 100644
--- a/tests/baselines/reference/capturedLetConstInLoop4.js
+++ b/tests/baselines/reference/capturedLetConstInLoop4.js
@@ -144,8 +144,8 @@ for (const y = 0; y < 1;) {
 
 //// [capturedLetConstInLoop4.js]
 System.register([], function (exports_1, context_1) {
-    var v0, v00, v1, v2, v3, v4, v5, v6, v7, v8, v0_c, v00_c, v1_c, v2_c, v3_c, v4_c, v5_c, v6_c, v7_c, v8_c;
     "use strict";
+    var v0, v00, v1, v2, v3, v4, v5, v6, v7, v8, v0_c, v00_c, v1_c, v2_c, v3_c, v4_c, v5_c, v6_c, v7_c, v8_c;
     var __moduleName = context_1 && context_1.id;
     //======let
     function exportedFoo() {
diff --git a/tests/baselines/reference/decoratedClassExportsSystem1.js b/tests/baselines/reference/decoratedClassExportsSystem1.js
index 5921a42452444..844a87fe0930b 100644
--- a/tests/baselines/reference/decoratedClassExportsSystem1.js
+++ b/tests/baselines/reference/decoratedClassExportsSystem1.js
@@ -9,6 +9,7 @@ export class Testing123 {
 
 //// [a.js]
 System.register([], function (exports_1, context_1) {
+    "use strict";
     var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
         var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
         if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
@@ -16,7 +17,6 @@ System.register([], function (exports_1, context_1) {
         return c > 3 && r && Object.defineProperty(target, key, r), r;
     };
     var Testing123_1, Testing123;
-    "use strict";
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
diff --git a/tests/baselines/reference/decoratedClassExportsSystem2.js b/tests/baselines/reference/decoratedClassExportsSystem2.js
index e3f0a97b64dcc..a9458e125b325 100644
--- a/tests/baselines/reference/decoratedClassExportsSystem2.js
+++ b/tests/baselines/reference/decoratedClassExportsSystem2.js
@@ -6,6 +6,7 @@ export class Testing123 { }
 
 //// [a.js]
 System.register([], function (exports_1, context_1) {
+    "use strict";
     var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
         var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
         if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
@@ -13,7 +14,6 @@ System.register([], function (exports_1, context_1) {
         return c > 3 && r && Object.defineProperty(target, key, r), r;
     };
     var Testing123_1, Testing123;
-    "use strict";
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
diff --git a/tests/baselines/reference/decoratedDefaultExportsGetExportedSystem.js b/tests/baselines/reference/decoratedDefaultExportsGetExportedSystem.js
index 837fdc103f860..63290f4176a2b 100644
--- a/tests/baselines/reference/decoratedDefaultExportsGetExportedSystem.js
+++ b/tests/baselines/reference/decoratedDefaultExportsGetExportedSystem.js
@@ -14,6 +14,7 @@ export default class {}
 
 //// [a.js]
 System.register([], function (exports_1, context_1) {
+    "use strict";
     var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
         var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
         if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
@@ -21,7 +22,6 @@ System.register([], function (exports_1, context_1) {
         return c > 3 && r && Object.defineProperty(target, key, r), r;
     };
     var decorator, Foo;
-    "use strict";
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
@@ -37,6 +37,7 @@ System.register([], function (exports_1, context_1) {
 });
 //// [b.js]
 System.register([], function (exports_1, context_1) {
+    "use strict";
     var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
         var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
         if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
@@ -44,7 +45,6 @@ System.register([], function (exports_1, context_1) {
         return c > 3 && r && Object.defineProperty(target, key, r), r;
     };
     var decorator, default_1;
-    "use strict";
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
diff --git a/tests/baselines/reference/deduplicateImportsInSystem.js b/tests/baselines/reference/deduplicateImportsInSystem.js
index 8bf49a449cca9..d96d5af80d353 100644
--- a/tests/baselines/reference/deduplicateImportsInSystem.js
+++ b/tests/baselines/reference/deduplicateImportsInSystem.js
@@ -10,8 +10,8 @@ console.log(A + B + C + D + E + F)
 
 //// [deduplicateImportsInSystem.js]
 System.register(["f1", "f2", "f3"], function (exports_1, context_1) {
-    var f1_1, f2_1, f3_1, f2_2, f2_3, f1_2;
     "use strict";
+    var f1_1, f2_1, f3_1, f2_2, f2_3, f1_2;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [
diff --git a/tests/baselines/reference/defaultExportsGetExportedSystem.js b/tests/baselines/reference/defaultExportsGetExportedSystem.js
index 0269905babac2..229c5d0aae67d 100644
--- a/tests/baselines/reference/defaultExportsGetExportedSystem.js
+++ b/tests/baselines/reference/defaultExportsGetExportedSystem.js
@@ -9,8 +9,8 @@ export default function foo() {}
 
 //// [a.js]
 System.register([], function (exports_1, context_1) {
-    var Foo;
     "use strict";
+    var Foo;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
diff --git a/tests/baselines/reference/destructuringAssignmentWithExportedName.js b/tests/baselines/reference/destructuringAssignmentWithExportedName.js
index 81f38a383aba6..4dc60ecff7766 100644
--- a/tests/baselines/reference/destructuringAssignmentWithExportedName.js
+++ b/tests/baselines/reference/destructuringAssignmentWithExportedName.js
@@ -26,8 +26,8 @@ export { nonexportedFoo };
 export { exportedFoo as foo, nonexportedFoo as nfoo };
 
 //// [destructuringAssignmentWithExportedName.js]
-var _a, _b, _c, _d, _e;
 "use strict";
+var _a, _b, _c, _d, _e;
 Object.defineProperty(exports, "__esModule", { value: true });
 exports.foo = exports.exportedFoo;
 let nonexportedFoo;
diff --git a/tests/baselines/reference/destructuringInVariableDeclarations7.js b/tests/baselines/reference/destructuringInVariableDeclarations7.js
index aabbb822523b1..cc6f0799c6a56 100644
--- a/tests/baselines/reference/destructuringInVariableDeclarations7.js
+++ b/tests/baselines/reference/destructuringInVariableDeclarations7.js
@@ -7,8 +7,8 @@ export let { toString } = 1;
 
 //// [destructuringInVariableDeclarations7.js]
 System.register([], function (exports_1, context_1) {
-    var toString;
     "use strict";
+    var toString;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
diff --git a/tests/baselines/reference/destructuringInVariableDeclarations8.js b/tests/baselines/reference/destructuringInVariableDeclarations8.js
index 5455061cbc328..d12fa80700334 100644
--- a/tests/baselines/reference/destructuringInVariableDeclarations8.js
+++ b/tests/baselines/reference/destructuringInVariableDeclarations8.js
@@ -8,8 +8,8 @@ export {};
 
 //// [destructuringInVariableDeclarations8.js]
 System.register([], function (exports_1, context_1) {
-    var toString;
     "use strict";
+    var toString;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
diff --git a/tests/baselines/reference/dottedNamesInSystem.js b/tests/baselines/reference/dottedNamesInSystem.js
index c2a5f7e882a3b..b65dba306f16e 100644
--- a/tests/baselines/reference/dottedNamesInSystem.js
+++ b/tests/baselines/reference/dottedNamesInSystem.js
@@ -9,8 +9,8 @@ export function bar() {
 
 //// [dottedNamesInSystem.js]
 System.register([], function (exports_1, context_1) {
-    var A;
     "use strict";
+    var A;
     var __moduleName = context_1 && context_1.id;
     function bar() {
         return A.B.C.foo();
diff --git a/tests/baselines/reference/es5-system.js b/tests/baselines/reference/es5-system.js
index c84b5c9e6313d..f28fcd3d437ac 100644
--- a/tests/baselines/reference/es5-system.js
+++ b/tests/baselines/reference/es5-system.js
@@ -15,8 +15,8 @@ export default class A
 
 //// [es5-system.js]
 System.register([], function (exports_1, context_1) {
-    var A;
     "use strict";
+    var A;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
diff --git a/tests/baselines/reference/es5-system2.js b/tests/baselines/reference/es5-system2.js
index bb69721662828..eef60a3c0ef71 100644
--- a/tests/baselines/reference/es5-system2.js
+++ b/tests/baselines/reference/es5-system2.js
@@ -3,8 +3,8 @@ export var __esModule = 1;
 
 //// [es5-system2.js]
 System.register([], function (exports_1, context_1) {
-    var __esModule;
     "use strict";
+    var __esModule;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
diff --git a/tests/baselines/reference/exportNonInitializedVariablesSystem.js b/tests/baselines/reference/exportNonInitializedVariablesSystem.js
index 56d27bfbead00..88f332eb30094 100644
--- a/tests/baselines/reference/exportNonInitializedVariablesSystem.js
+++ b/tests/baselines/reference/exportNonInitializedVariablesSystem.js
@@ -35,8 +35,8 @@ export let h1: D = new D;
 
 //// [exportNonInitializedVariablesSystem.js]
 System.register([], function (exports_1, context_1) {
-    var a, b, c, d, A, e, f, B, C, a1, b1, c1, d1, D, e1, f1, g1, h1;
     "use strict";
+    var a, b, c, d, A, e, f, B, C, a1, b1, c1, d1, D, e1, f1, g1, h1;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
diff --git a/tests/baselines/reference/exportStarForValues10.js b/tests/baselines/reference/exportStarForValues10.js
index 249a633cd07b8..49f40ab53741a 100644
--- a/tests/baselines/reference/exportStarForValues10.js
+++ b/tests/baselines/reference/exportStarForValues10.js
@@ -13,8 +13,8 @@ var x = 1;
 
 //// [file0.js]
 System.register([], function (exports_1, context_1) {
-    var v;
     "use strict";
+    var v;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
@@ -35,8 +35,8 @@ System.register([], function (exports_1, context_1) {
 });
 //// [file2.js]
 System.register(["file0"], function (exports_1, context_1) {
-    var x;
     "use strict";
+    var x;
     var __moduleName = context_1 && context_1.id;
     function exportStar_1(m) {
         var exports = {};
diff --git a/tests/baselines/reference/exportStarForValues6.js b/tests/baselines/reference/exportStarForValues6.js
index 8bf7e91c87ab7..0e593f4efb523 100644
--- a/tests/baselines/reference/exportStarForValues6.js
+++ b/tests/baselines/reference/exportStarForValues6.js
@@ -19,8 +19,8 @@ System.register([], function (exports_1, context_1) {
 });
 //// [file2.js]
 System.register([], function (exports_1, context_1) {
-    var x;
     "use strict";
+    var x;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
diff --git a/tests/baselines/reference/exportStarForValuesInSystem.js b/tests/baselines/reference/exportStarForValuesInSystem.js
index d5f9c5bac2c10..c7406dc18d87c 100644
--- a/tests/baselines/reference/exportStarForValuesInSystem.js
+++ b/tests/baselines/reference/exportStarForValuesInSystem.js
@@ -19,8 +19,8 @@ System.register([], function (exports_1, context_1) {
 });
 //// [file2.js]
 System.register([], function (exports_1, context_1) {
-    var x;
     "use strict";
+    var x;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
diff --git a/tests/baselines/reference/importCallExpressionAsyncES3System.js b/tests/baselines/reference/importCallExpressionAsyncES3System.js
index 7f9814e7e96aa..95933e2fd9b85 100644
--- a/tests/baselines/reference/importCallExpressionAsyncES3System.js
+++ b/tests/baselines/reference/importCallExpressionAsyncES3System.js
@@ -30,6 +30,7 @@ export const l = async () => {
 
 //// [test.js]
 System.register([], function (exports_1, context_1) {
+    "use strict";
     var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
         return new (P || (P = Promise))(function (resolve, reject) {
             function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
@@ -66,7 +67,6 @@ System.register([], function (exports_1, context_1) {
         }
     };
     var _this, cl1, obj, cl2, l;
-    "use strict";
     _this = this;
     var __moduleName = context_1 && context_1.id;
     function fn() {
diff --git a/tests/baselines/reference/importCallExpressionAsyncES5System.js b/tests/baselines/reference/importCallExpressionAsyncES5System.js
index 2a3c3629f1b70..c83290ddcdcd8 100644
--- a/tests/baselines/reference/importCallExpressionAsyncES5System.js
+++ b/tests/baselines/reference/importCallExpressionAsyncES5System.js
@@ -30,6 +30,7 @@ export const l = async () => {
 
 //// [test.js]
 System.register([], function (exports_1, context_1) {
+    "use strict";
     var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
         return new (P || (P = Promise))(function (resolve, reject) {
             function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
@@ -66,7 +67,6 @@ System.register([], function (exports_1, context_1) {
         }
     };
     var _this, cl1, obj, cl2, l;
-    "use strict";
     _this = this;
     var __moduleName = context_1 && context_1.id;
     function fn() {
diff --git a/tests/baselines/reference/importCallExpressionAsyncES6System.js b/tests/baselines/reference/importCallExpressionAsyncES6System.js
index ed771dbb4c083..1f605dcc3f8b7 100644
--- a/tests/baselines/reference/importCallExpressionAsyncES6System.js
+++ b/tests/baselines/reference/importCallExpressionAsyncES6System.js
@@ -30,6 +30,7 @@ export const l = async () => {
 
 //// [test.js]
 System.register([], function (exports_1, context_1) {
+    "use strict";
     var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
         return new (P || (P = Promise))(function (resolve, reject) {
             function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
@@ -39,7 +40,6 @@ System.register([], function (exports_1, context_1) {
         });
     };
     var cl1, obj, cl2, l;
-    "use strict";
     var __moduleName = context_1 && context_1.id;
     function fn() {
         return __awaiter(this, void 0, void 0, function* () {
diff --git a/tests/baselines/reference/importCallExpressionES5System.js b/tests/baselines/reference/importCallExpressionES5System.js
index 69c005df3bd5d..af9e8d744c50d 100644
--- a/tests/baselines/reference/importCallExpressionES5System.js
+++ b/tests/baselines/reference/importCallExpressionES5System.js
@@ -42,8 +42,8 @@ System.register([], function (exports_1, context_1) {
 });
 //// [1.js]
 System.register([], function (exports_1, context_1) {
-    var p1, p2, C, D;
     "use strict";
+    var p1, p2, C, D;
     var __moduleName = context_1 && context_1.id;
     function foo() {
         var p2 = context_1.import("./0");
diff --git a/tests/baselines/reference/importCallExpressionES6System.js b/tests/baselines/reference/importCallExpressionES6System.js
index abf8ff507edcd..9ed9f2ae54a29 100644
--- a/tests/baselines/reference/importCallExpressionES6System.js
+++ b/tests/baselines/reference/importCallExpressionES6System.js
@@ -42,8 +42,8 @@ System.register([], function (exports_1, context_1) {
 });
 //// [1.js]
 System.register([], function (exports_1, context_1) {
-    var p1, p2, C, D;
     "use strict";
+    var p1, p2, C, D;
     var __moduleName = context_1 && context_1.id;
     function foo() {
         const p2 = context_1.import("./0");
diff --git a/tests/baselines/reference/importCallExpressionInSystem1.js b/tests/baselines/reference/importCallExpressionInSystem1.js
index 237ca312b8884..b110867014928 100644
--- a/tests/baselines/reference/importCallExpressionInSystem1.js
+++ b/tests/baselines/reference/importCallExpressionInSystem1.js
@@ -30,8 +30,8 @@ System.register([], function (exports_1, context_1) {
 });
 //// [1.js]
 System.register([], function (exports_1, context_1) {
-    var p1, p2;
     "use strict";
+    var p1, p2;
     var __moduleName = context_1 && context_1.id;
     function foo() {
         const p2 = context_1.import("./0");
diff --git a/tests/baselines/reference/importCallExpressionInSystem2.js b/tests/baselines/reference/importCallExpressionInSystem2.js
index b64632bc9dbd6..165b47fdb1a39 100644
--- a/tests/baselines/reference/importCallExpressionInSystem2.js
+++ b/tests/baselines/reference/importCallExpressionInSystem2.js
@@ -18,8 +18,8 @@ foo(import("./0"));
 
 //// [0.js]
 System.register([], function (exports_1, context_1) {
-    var B;
     "use strict";
+    var B;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
diff --git a/tests/baselines/reference/importCallExpressionInSystem3.js b/tests/baselines/reference/importCallExpressionInSystem3.js
index 89bee94766240..2bf6d4c028849 100644
--- a/tests/baselines/reference/importCallExpressionInSystem3.js
+++ b/tests/baselines/reference/importCallExpressionInSystem3.js
@@ -15,8 +15,8 @@ foo();
 
 //// [0.js]
 System.register([], function (exports_1, context_1) {
-    var B;
     "use strict";
+    var B;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
diff --git a/tests/baselines/reference/importCallExpressionInSystem4.js b/tests/baselines/reference/importCallExpressionInSystem4.js
index dd2f9faadc868..55af57174bdf3 100644
--- a/tests/baselines/reference/importCallExpressionInSystem4.js
+++ b/tests/baselines/reference/importCallExpressionInSystem4.js
@@ -42,8 +42,8 @@ export class D {
 
 //// [0.js]
 System.register([], function (exports_1, context_1) {
-    var B;
     "use strict";
+    var B;
     var __moduleName = context_1 && context_1.id;
     function foo() { return "foo"; }
     exports_1("foo", foo);
@@ -71,8 +71,8 @@ System.register([], function (exports_1, context_1) {
 });
 //// [2.js]
 System.register([], function (exports_1, context_1) {
-    var C, D;
     "use strict";
+    var C, D;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
diff --git a/tests/baselines/reference/importHelpersSystem.js b/tests/baselines/reference/importHelpersSystem.js
index 6e29369b8423b..32060987369c5 100644
--- a/tests/baselines/reference/importHelpersSystem.js
+++ b/tests/baselines/reference/importHelpersSystem.js
@@ -19,8 +19,8 @@ export declare function __awaiter(thisArg: any, _arguments: any, P: Function, ge
 
 //// [a.js]
 System.register([], function (exports_1, context_1) {
-    var A;
     "use strict";
+    var A;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
@@ -36,8 +36,8 @@ System.register([], function (exports_1, context_1) {
 });
 //// [b.js]
 System.register(["tslib", "./a"], function (exports_1, context_1) {
-    var tslib_1, a_1, B;
     "use strict";
+    var tslib_1, a_1, B;
     var __moduleName = context_1 && context_1.id;
     var exportedNames_1 = {
         "B": true
diff --git a/tests/baselines/reference/invalidSyntaxNamespaceImportWithSystem.js b/tests/baselines/reference/invalidSyntaxNamespaceImportWithSystem.js
index 4a3c6fbcf0667..aaeece2da4627 100644
--- a/tests/baselines/reference/invalidSyntaxNamespaceImportWithSystem.js
+++ b/tests/baselines/reference/invalidSyntaxNamespaceImportWithSystem.js
@@ -8,8 +8,8 @@ import * from Zero from "./0"
 
 //// [0.js]
 System.register([], function (exports_1, context_1) {
-    var C;
     "use strict";
+    var C;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
@@ -25,8 +25,8 @@ System.register([], function (exports_1, context_1) {
 });
 //// [1.js]
 System.register([], function (exports_1, context_1) {
-    var from;
     "use strict";
+    var from;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
diff --git a/tests/baselines/reference/modulePrologueSystem.js b/tests/baselines/reference/modulePrologueSystem.js
index 849355db9c531..ea8fc5d8a6564 100644
--- a/tests/baselines/reference/modulePrologueSystem.js
+++ b/tests/baselines/reference/modulePrologueSystem.js
@@ -5,8 +5,8 @@ export class Foo {}
 
 //// [modulePrologueSystem.js]
 System.register([], function (exports_1, context_1) {
-    var Foo;
     "use strict";
+    var Foo;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
diff --git a/tests/baselines/reference/outFilerootDirModuleNamesSystem.js b/tests/baselines/reference/outFilerootDirModuleNamesSystem.js
index b5da7ffa604db..0cf43e047a098 100644
--- a/tests/baselines/reference/outFilerootDirModuleNamesSystem.js
+++ b/tests/baselines/reference/outFilerootDirModuleNamesSystem.js
@@ -12,8 +12,8 @@ export default function foo() { new Foo(); }
 
 //// [output.js]
 System.register("b", ["a"], function (exports_1, context_1) {
-    var a_1;
     "use strict";
+    var a_1;
     var __moduleName = context_1 && context_1.id;
     function foo() { new a_1.default(); }
     exports_1("default", foo);
@@ -28,8 +28,8 @@ System.register("b", ["a"], function (exports_1, context_1) {
     };
 });
 System.register("a", ["b"], function (exports_2, context_2) {
-    var b_1, Foo;
     "use strict";
+    var b_1, Foo;
     var __moduleName = context_2 && context_2.id;
     return {
         setters: [
diff --git a/tests/baselines/reference/outModuleConcatSystem.js b/tests/baselines/reference/outModuleConcatSystem.js
index 00e1f39e45a4f..7d3f4200834f6 100644
--- a/tests/baselines/reference/outModuleConcatSystem.js
+++ b/tests/baselines/reference/outModuleConcatSystem.js
@@ -19,8 +19,8 @@ var __extends = (this && this.__extends) || (function () {
     };
 })();
 System.register("ref/a", [], function (exports_1, context_1) {
-    var A;
     "use strict";
+    var A;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
@@ -35,8 +35,8 @@ System.register("ref/a", [], function (exports_1, context_1) {
     };
 });
 System.register("b", ["ref/a"], function (exports_2, context_2) {
-    var a_1, B;
     "use strict";
+    var a_1, B;
     var __moduleName = context_2 && context_2.id;
     return {
         setters: [
diff --git a/tests/baselines/reference/outModuleConcatSystem.sourcemap.txt b/tests/baselines/reference/outModuleConcatSystem.sourcemap.txt
index 0f6361d0e8f06..100165753eca8 100644
--- a/tests/baselines/reference/outModuleConcatSystem.sourcemap.txt
+++ b/tests/baselines/reference/outModuleConcatSystem.sourcemap.txt
@@ -19,8 +19,8 @@ sourceFile:tests/cases/compiler/ref/a.ts
 >>>    };
 >>>})();
 >>>System.register("ref/a", [], function (exports_1, context_1) {
->>>    var A;
 >>>    "use strict";
+>>>    var A;
 >>>    var __moduleName = context_1 && context_1.id;
 >>>    return {
 >>>        setters: [],
@@ -86,8 +86,8 @@ sourceFile:tests/cases/compiler/b.ts
 >>>    };
 >>>});
 >>>System.register("b", ["ref/a"], function (exports_2, context_2) {
->>>    var a_1, B;
 >>>    "use strict";
+>>>    var a_1, B;
 >>>    var __moduleName = context_2 && context_2.id;
 >>>    return {
 >>>        setters: [
diff --git a/tests/baselines/reference/prefixUnaryOperatorsOnExportedVariables.js b/tests/baselines/reference/prefixUnaryOperatorsOnExportedVariables.js
index 3990aa4ef1e4a..3241bcacf8826 100644
--- a/tests/baselines/reference/prefixUnaryOperatorsOnExportedVariables.js
+++ b/tests/baselines/reference/prefixUnaryOperatorsOnExportedVariables.js
@@ -31,8 +31,8 @@ if (++y) {
 
 //// [prefixUnaryOperatorsOnExportedVariables.js]
 System.register([], function (exports_1, context_1) {
-    var x, y;
     "use strict";
+    var x, y;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
diff --git a/tests/baselines/reference/systemDefaultExportCommentValidity.js b/tests/baselines/reference/systemDefaultExportCommentValidity.js
index 12a2d84db73c8..6fa0c45d5592d 100644
--- a/tests/baselines/reference/systemDefaultExportCommentValidity.js
+++ b/tests/baselines/reference/systemDefaultExportCommentValidity.js
@@ -6,8 +6,8 @@ export default Home
 
 //// [systemDefaultExportCommentValidity.js]
 System.register([], function (exports_1, context_1) {
-    var Home;
     "use strict";
+    var Home;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
diff --git a/tests/baselines/reference/systemDefaultImportCallable.js b/tests/baselines/reference/systemDefaultImportCallable.js
index da1ed916e0a5d..c9dbadda0d2b7 100644
--- a/tests/baselines/reference/systemDefaultImportCallable.js
+++ b/tests/baselines/reference/systemDefaultImportCallable.js
@@ -17,8 +17,8 @@ const _: string = repeat(new Date().toUTCString() + " ", 2);
 
 //// [greeter.js]
 System.register(["core-js/fn/string/repeat"], function (exports_1, context_1) {
-    var repeat_1, _;
     "use strict";
+    var repeat_1, _;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [
diff --git a/tests/baselines/reference/systemExportAssignment2.js b/tests/baselines/reference/systemExportAssignment2.js
index 01b935cb223c0..f4d56cffa6ca6 100644
--- a/tests/baselines/reference/systemExportAssignment2.js
+++ b/tests/baselines/reference/systemExportAssignment2.js
@@ -10,8 +10,8 @@ import * as a from "a";
 
 //// [a.js]
 System.register([], function (exports_1, context_1) {
-    var a;
     "use strict";
+    var a;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
diff --git a/tests/baselines/reference/systemJsForInNoException.js b/tests/baselines/reference/systemJsForInNoException.js
index 1b330b216cec6..32194ce30ae8e 100644
--- a/tests/baselines/reference/systemJsForInNoException.js
+++ b/tests/baselines/reference/systemJsForInNoException.js
@@ -5,8 +5,8 @@ for (var key in obj)
 
 //// [systemJsForInNoException.js]
 System.register([], function (exports_1, context_1) {
-    var obj, key;
     "use strict";
+    var obj, key;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
diff --git a/tests/baselines/reference/systemModule1.js b/tests/baselines/reference/systemModule1.js
index bd813b39c97f9..6a739650889e7 100644
--- a/tests/baselines/reference/systemModule1.js
+++ b/tests/baselines/reference/systemModule1.js
@@ -3,8 +3,8 @@ export var x = 1;
 
 //// [systemModule1.js]
 System.register([], function (exports_1, context_1) {
-    var x;
     "use strict";
+    var x;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
diff --git a/tests/baselines/reference/systemModule10.js b/tests/baselines/reference/systemModule10.js
index 29ce481bfb0f7..953a949f2a11c 100644
--- a/tests/baselines/reference/systemModule10.js
+++ b/tests/baselines/reference/systemModule10.js
@@ -10,8 +10,8 @@ export {n2 as n3}
 
 //// [systemModule10.js]
 System.register(["file1", "file2"], function (exports_1, context_1) {
-    var file1_1, n2;
     "use strict";
+    var file1_1, n2;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [
diff --git a/tests/baselines/reference/systemModule10_ES5.js b/tests/baselines/reference/systemModule10_ES5.js
index bae6bd2c43cab..26201b487c930 100644
--- a/tests/baselines/reference/systemModule10_ES5.js
+++ b/tests/baselines/reference/systemModule10_ES5.js
@@ -10,8 +10,8 @@ export {n2 as n3}
 
 //// [systemModule10_ES5.js]
 System.register(["file1", "file2"], function (exports_1, context_1) {
-    var file1_1, n2;
     "use strict";
+    var file1_1, n2;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [
diff --git a/tests/baselines/reference/systemModule11.js b/tests/baselines/reference/systemModule11.js
index 49543b958cfde..d353476f5b837 100644
--- a/tests/baselines/reference/systemModule11.js
+++ b/tests/baselines/reference/systemModule11.js
@@ -38,8 +38,8 @@ export * from 'a';
 //// [file1.js]
 // set of tests cases that checks generation of local storage for exported names
 System.register(["bar"], function (exports_1, context_1) {
-    var x;
     "use strict";
+    var x;
     var __moduleName = context_1 && context_1.id;
     function foo() { }
     exports_1("foo", foo);
@@ -66,8 +66,8 @@ System.register(["bar"], function (exports_1, context_1) {
 });
 //// [file2.js]
 System.register(["bar"], function (exports_1, context_1) {
-    var x, y;
     "use strict";
+    var x, y;
     var __moduleName = context_1 && context_1.id;
     var exportedNames_1 = {
         "x": true,
@@ -125,8 +125,8 @@ System.register(["a", "bar"], function (exports_1, context_1) {
 });
 //// [file4.js]
 System.register(["a"], function (exports_1, context_1) {
-    var x, z, z1;
     "use strict";
+    var x, z, z1;
     var __moduleName = context_1 && context_1.id;
     function foo() { }
     exports_1("foo", foo);
diff --git a/tests/baselines/reference/systemModule13.js b/tests/baselines/reference/systemModule13.js
index 370bcadfa2ef3..117a8108b4775 100644
--- a/tests/baselines/reference/systemModule13.js
+++ b/tests/baselines/reference/systemModule13.js
@@ -5,8 +5,8 @@ for ([x] of [[1]]) {}
 
 //// [systemModule13.js]
 System.register([], function (exports_1, context_1) {
-    var _a, _b, x, y, z, z0, z1;
     "use strict";
+    var _a, _b, x, y, z, z0, z1;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
diff --git a/tests/baselines/reference/systemModule14.js b/tests/baselines/reference/systemModule14.js
index 361d8e7fe35bc..73c2a981c1b12 100644
--- a/tests/baselines/reference/systemModule14.js
+++ b/tests/baselines/reference/systemModule14.js
@@ -11,8 +11,8 @@ export {foo as b}
 
 //// [systemModule14.js]
 System.register(["foo"], function (exports_1, context_1) {
-    var foo_1, x;
     "use strict";
+    var foo_1, x;
     var __moduleName = context_1 && context_1.id;
     function foo() {
         return foo_1.a;
diff --git a/tests/baselines/reference/systemModule15.js b/tests/baselines/reference/systemModule15.js
index 05c551b1b6789..e24403b9c031c 100644
--- a/tests/baselines/reference/systemModule15.js
+++ b/tests/baselines/reference/systemModule15.js
@@ -30,8 +30,8 @@ export var value2 = "v";
 
 //// [file3.js]
 System.register([], function (exports_1, context_1) {
-    var value;
     "use strict";
+    var value;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
@@ -43,8 +43,8 @@ System.register([], function (exports_1, context_1) {
 });
 //// [file4.js]
 System.register([], function (exports_1, context_1) {
-    var value2;
     "use strict";
+    var value2;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
@@ -55,8 +55,8 @@ System.register([], function (exports_1, context_1) {
 });
 //// [file2.js]
 System.register(["./file3"], function (exports_1, context_1) {
-    var moduleCStar, file3_1, file3_2;
     "use strict";
+    var moduleCStar, file3_1, file3_2;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [
@@ -75,8 +75,8 @@ System.register(["./file3"], function (exports_1, context_1) {
 });
 //// [file1.js]
 System.register(["./file2"], function (exports_1, context_1) {
-    var moduleB;
     "use strict";
+    var moduleB;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [
diff --git a/tests/baselines/reference/systemModule16.js b/tests/baselines/reference/systemModule16.js
index e390b68001ded..50cffe3afad64 100644
--- a/tests/baselines/reference/systemModule16.js
+++ b/tests/baselines/reference/systemModule16.js
@@ -13,8 +13,8 @@ x,y,a1,b1,d1;
 
 //// [systemModule16.js]
 System.register(["foo", "bar"], function (exports_1, context_1) {
-    var x, y, foo_1;
     "use strict";
+    var x, y, foo_1;
     var __moduleName = context_1 && context_1.id;
     var exportedNames_1 = {
         "x": true,
diff --git a/tests/baselines/reference/systemModule17.js b/tests/baselines/reference/systemModule17.js
index e96da2e2ad341..a59d1d3372324 100644
--- a/tests/baselines/reference/systemModule17.js
+++ b/tests/baselines/reference/systemModule17.js
@@ -40,8 +40,8 @@ export {II as II1};
 
 //// [f1.js]
 System.register([], function (exports_1, context_1) {
-    var A;
     "use strict";
+    var A;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
@@ -57,8 +57,8 @@ System.register([], function (exports_1, context_1) {
 });
 //// [f2.js]
 System.register(["f1"], function (exports_1, context_1) {
-    var x, N, IX, f1_1;
     "use strict";
+    var x, N, IX, f1_1;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [
diff --git a/tests/baselines/reference/systemModule2.js b/tests/baselines/reference/systemModule2.js
index 800e4286d9698..0bbec083ba1db 100644
--- a/tests/baselines/reference/systemModule2.js
+++ b/tests/baselines/reference/systemModule2.js
@@ -4,8 +4,8 @@ export = x;
 
 //// [systemModule2.js]
 System.register([], function (exports_1, context_1) {
-    var x;
     "use strict";
+    var x;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
diff --git a/tests/baselines/reference/systemModule3.js b/tests/baselines/reference/systemModule3.js
index a2e46bd76d460..49bb238f11cb2 100644
--- a/tests/baselines/reference/systemModule3.js
+++ b/tests/baselines/reference/systemModule3.js
@@ -38,8 +38,8 @@ System.register([], function (exports_1, context_1) {
 });
 //// [file3.js]
 System.register([], function (exports_1, context_1) {
-    var C;
     "use strict";
+    var C;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
@@ -55,8 +55,8 @@ System.register([], function (exports_1, context_1) {
 });
 //// [file4.js]
 System.register([], function (exports_1, context_1) {
-    var default_1;
     "use strict";
+    var default_1;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
diff --git a/tests/baselines/reference/systemModule4.js b/tests/baselines/reference/systemModule4.js
index 5e346f6250c0e..8b50d0f0fc38d 100644
--- a/tests/baselines/reference/systemModule4.js
+++ b/tests/baselines/reference/systemModule4.js
@@ -4,8 +4,8 @@ export var y;
 
 //// [systemModule4.js]
 System.register([], function (exports_1, context_1) {
-    var x, y;
     "use strict";
+    var x, y;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
diff --git a/tests/baselines/reference/systemModule6.js b/tests/baselines/reference/systemModule6.js
index c994f45f9846b..77e13fa29c954 100644
--- a/tests/baselines/reference/systemModule6.js
+++ b/tests/baselines/reference/systemModule6.js
@@ -7,8 +7,8 @@ function foo() {
 
 //// [systemModule6.js]
 System.register([], function (exports_1, context_1) {
-    var C;
     "use strict";
+    var C;
     var __moduleName = context_1 && context_1.id;
     function foo() {
         new C();
diff --git a/tests/baselines/reference/systemModule7.js b/tests/baselines/reference/systemModule7.js
index b5be65f118e70..04ddabc523b6c 100644
--- a/tests/baselines/reference/systemModule7.js
+++ b/tests/baselines/reference/systemModule7.js
@@ -11,8 +11,8 @@ export module M {
 
 //// [systemModule7.js]
 System.register([], function (exports_1, context_1) {
-    var M;
     "use strict";
+    var M;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
diff --git a/tests/baselines/reference/systemModule8.js b/tests/baselines/reference/systemModule8.js
index cc79e858ec147..b46c56b703d32 100644
--- a/tests/baselines/reference/systemModule8.js
+++ b/tests/baselines/reference/systemModule8.js
@@ -31,8 +31,8 @@ for ([x] of [[1]]) {}
 
 //// [systemModule8.js]
 System.register([], function (exports_1, context_1) {
-    var _a, x, y, z0, z1;
     "use strict";
+    var _a, x, y, z0, z1;
     var __moduleName = context_1 && context_1.id;
     function foo() {
         exports_1("x", x = 100);
diff --git a/tests/baselines/reference/systemModule9.js b/tests/baselines/reference/systemModule9.js
index 1d9b711ff6271..06c15910b65bf 100644
--- a/tests/baselines/reference/systemModule9.js
+++ b/tests/baselines/reference/systemModule9.js
@@ -22,8 +22,8 @@ export {y as z};
 
 //// [systemModule9.js]
 System.register(["file1", "file2", "file3", "file4", "file5", "file6", "file7"], function (exports_1, context_1) {
-    var ns, file2_1, file3_1, file5_1, ns3, x, y;
     "use strict";
+    var ns, file2_1, file3_1, file5_1, ns3, x, y;
     var __moduleName = context_1 && context_1.id;
     var exportedNames_1 = {
         "x": true,
diff --git a/tests/baselines/reference/systemModuleAmbientDeclarations.js b/tests/baselines/reference/systemModuleAmbientDeclarations.js
index cca1c34436a4a..b53ae9cc2d40a 100644
--- a/tests/baselines/reference/systemModuleAmbientDeclarations.js
+++ b/tests/baselines/reference/systemModuleAmbientDeclarations.js
@@ -29,8 +29,8 @@ export declare module M { var v: number; }
 
 //// [file1.js]
 System.register([], function (exports_1, context_1) {
-    var promise, foo, c, e;
     "use strict";
+    var promise, foo, c, e;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
diff --git a/tests/baselines/reference/systemModuleConstEnumsSeparateCompilation.js b/tests/baselines/reference/systemModuleConstEnumsSeparateCompilation.js
index bd4e855ca128d..ccb6a35411b21 100644
--- a/tests/baselines/reference/systemModuleConstEnumsSeparateCompilation.js
+++ b/tests/baselines/reference/systemModuleConstEnumsSeparateCompilation.js
@@ -13,8 +13,8 @@ module M {
 
 //// [systemModuleConstEnumsSeparateCompilation.js]
 System.register([], function (exports_1, context_1) {
-    var TopLevelConstEnum, M;
     "use strict";
+    var TopLevelConstEnum, M;
     var __moduleName = context_1 && context_1.id;
     function foo() {
         use(TopLevelConstEnum.X);
diff --git a/tests/baselines/reference/systemModuleDeclarationMerging.js b/tests/baselines/reference/systemModuleDeclarationMerging.js
index 0a52d049f713e..bcf3a505a484f 100644
--- a/tests/baselines/reference/systemModuleDeclarationMerging.js
+++ b/tests/baselines/reference/systemModuleDeclarationMerging.js
@@ -10,8 +10,8 @@ export module E { var x; }
 
 //// [systemModuleDeclarationMerging.js]
 System.register([], function (exports_1, context_1) {
-    var C, E;
     "use strict";
+    var C, E;
     var __moduleName = context_1 && context_1.id;
     function F() { }
     exports_1("F", F);
diff --git a/tests/baselines/reference/systemModuleExportDefault.js b/tests/baselines/reference/systemModuleExportDefault.js
index 787d5df6c8573..d4eb8d8a4a03c 100644
--- a/tests/baselines/reference/systemModuleExportDefault.js
+++ b/tests/baselines/reference/systemModuleExportDefault.js
@@ -40,8 +40,8 @@ System.register([], function (exports_1, context_1) {
 });
 //// [file3.js]
 System.register([], function (exports_1, context_1) {
-    var default_1;
     "use strict";
+    var default_1;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
@@ -57,8 +57,8 @@ System.register([], function (exports_1, context_1) {
 });
 //// [file4.js]
 System.register([], function (exports_1, context_1) {
-    var C;
     "use strict";
+    var C;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
diff --git a/tests/baselines/reference/systemModuleNonTopLevelModuleMembers.js b/tests/baselines/reference/systemModuleNonTopLevelModuleMembers.js
index cfce3624f4487..1925cec4cd0e3 100644
--- a/tests/baselines/reference/systemModuleNonTopLevelModuleMembers.js
+++ b/tests/baselines/reference/systemModuleNonTopLevelModuleMembers.js
@@ -13,8 +13,8 @@ export module TopLevelModule2 {
 
 //// [systemModuleNonTopLevelModuleMembers.js]
 System.register([], function (exports_1, context_1) {
-    var TopLevelClass, TopLevelModule, TopLevelEnum, TopLevelModule2;
     "use strict";
+    var TopLevelClass, TopLevelModule, TopLevelEnum, TopLevelModule2;
     var __moduleName = context_1 && context_1.id;
     function TopLevelFunction() { }
     exports_1("TopLevelFunction", TopLevelFunction);
diff --git a/tests/baselines/reference/systemModuleTargetES6.js b/tests/baselines/reference/systemModuleTargetES6.js
index 1f26df84e93ab..943e57ff742ac 100644
--- a/tests/baselines/reference/systemModuleTargetES6.js
+++ b/tests/baselines/reference/systemModuleTargetES6.js
@@ -15,8 +15,8 @@ export function myFunction2() {
 
 //// [systemModuleTargetES6.js]
 System.register([], function (exports_1, context_1) {
-    var MyClass, MyClass2;
     "use strict";
+    var MyClass, MyClass2;
     var __moduleName = context_1 && context_1.id;
     function myFunction() {
         return new MyClass();
diff --git a/tests/baselines/reference/systemModuleTrailingComments.js b/tests/baselines/reference/systemModuleTrailingComments.js
index e5d5273133481..05eec6faa7553 100644
--- a/tests/baselines/reference/systemModuleTrailingComments.js
+++ b/tests/baselines/reference/systemModuleTrailingComments.js
@@ -5,8 +5,8 @@ export const test = "TEST";
 
 //// [systemModuleTrailingComments.js]
 System.register([], function (exports_1, context_1) {
-    var test;
     "use strict";
+    var test;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
diff --git a/tests/baselines/reference/systemModuleWithSuperClass.js b/tests/baselines/reference/systemModuleWithSuperClass.js
index 5d6b19a8f4edc..fcc10c2bcb2ec 100644
--- a/tests/baselines/reference/systemModuleWithSuperClass.js
+++ b/tests/baselines/reference/systemModuleWithSuperClass.js
@@ -13,8 +13,8 @@ export class Bar extends Foo {
 
 //// [foo.js]
 System.register([], function (exports_1, context_1) {
-    var Foo;
     "use strict";
+    var Foo;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
@@ -30,6 +30,7 @@ System.register([], function (exports_1, context_1) {
 });
 //// [bar.js]
 System.register(["./foo"], function (exports_1, context_1) {
+    "use strict";
     var __extends = (this && this.__extends) || (function () {
         var extendStatics = Object.setPrototypeOf ||
             ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
@@ -41,7 +42,6 @@ System.register(["./foo"], function (exports_1, context_1) {
         };
     })();
     var foo_1, Bar;
-    "use strict";
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [
diff --git a/tests/baselines/reference/systemNamespaceAliasEmit.js b/tests/baselines/reference/systemNamespaceAliasEmit.js
index 45e15c832fbec..3d36bad2ef172 100644
--- a/tests/baselines/reference/systemNamespaceAliasEmit.js
+++ b/tests/baselines/reference/systemNamespaceAliasEmit.js
@@ -12,8 +12,8 @@ export {ns, AnEnum, ns as FooBar, AnEnum as BarEnum};
 
 //// [systemNamespaceAliasEmit.js]
 System.register([], function (exports_1, context_1) {
-    var ns, AnEnum;
     "use strict";
+    var ns, AnEnum;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
diff --git a/tests/baselines/reference/systemObjectShorthandRename.js b/tests/baselines/reference/systemObjectShorthandRename.js
index 10cdb098c0280..1b679ef707ddc 100644
--- a/tests/baselines/reference/systemObjectShorthandRename.js
+++ b/tests/baselines/reference/systemObjectShorthandRename.js
@@ -13,8 +13,8 @@ const b = {x3}
 
 //// [x.js]
 System.register([], function (exports_1, context_1) {
-    var x;
     "use strict";
+    var x;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
@@ -25,8 +25,8 @@ System.register([], function (exports_1, context_1) {
 });
 //// [index.js]
 System.register(["./x.js"], function (exports_1, context_1) {
-    var x_js_1, x2, a, x3, b;
     "use strict";
+    var x_js_1, x2, a, x3, b;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [
diff --git a/tests/baselines/reference/transpile/Correctly serialize metadata when transpile with System option.js b/tests/baselines/reference/transpile/Correctly serialize metadata when transpile with System option.js
index 9927f8e2b5352..ff5c79971ca94 100644
--- a/tests/baselines/reference/transpile/Correctly serialize metadata when transpile with System option.js	
+++ b/tests/baselines/reference/transpile/Correctly serialize metadata when transpile with System option.js	
@@ -1,4 +1,5 @@
 System.register(["angular2/core"], function (exports_1, context_1) {
+    "use strict";
     var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
         var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
         if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
@@ -9,7 +10,6 @@ System.register(["angular2/core"], function (exports_1, context_1) {
         if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
     };
     var ng, MyClass1;
-    "use strict";
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [
diff --git a/tests/baselines/reference/transpile/Correctly serialize metadata when transpile with System option.oldTranspile.js b/tests/baselines/reference/transpile/Correctly serialize metadata when transpile with System option.oldTranspile.js
index 9927f8e2b5352..ff5c79971ca94 100644
--- a/tests/baselines/reference/transpile/Correctly serialize metadata when transpile with System option.oldTranspile.js	
+++ b/tests/baselines/reference/transpile/Correctly serialize metadata when transpile with System option.oldTranspile.js	
@@ -1,4 +1,5 @@
 System.register(["angular2/core"], function (exports_1, context_1) {
+    "use strict";
     var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
         var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
         if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
@@ -9,7 +10,6 @@ System.register(["angular2/core"], function (exports_1, context_1) {
         if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
     };
     var ng, MyClass1;
-    "use strict";
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [
diff --git a/tests/baselines/reference/transpile/Rename dependencies - System.js b/tests/baselines/reference/transpile/Rename dependencies - System.js
index 93f68a21afaeb..1b7773afc7299 100644
--- a/tests/baselines/reference/transpile/Rename dependencies - System.js	
+++ b/tests/baselines/reference/transpile/Rename dependencies - System.js	
@@ -1,6 +1,6 @@
 System.register(["SomeOtherName"], function (exports_1, context_1) {
-    var SomeName_1;
     "use strict";
+    var SomeName_1;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [