From 8210634e8dbc9a1bc41c108b21c19b4cfac4d91c Mon Sep 17 00:00:00 2001
From: Slawomir Sadziak <slsadzia@microsoft.com>
Date: Mon, 10 Oct 2016 23:03:07 +0200
Subject: [PATCH] Fix #10758 Add compiler option to parse in strict mode

 * fix comment
 * optimize loop
---
 src/compiler/factory.ts         | 7 ++-----
 src/compiler/transformers/ts.ts | 2 +-
 2 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/src/compiler/factory.ts b/src/compiler/factory.ts
index 6bf6259c364e8..5a95600d08931 100644
--- a/src/compiler/factory.ts
+++ b/src/compiler/factory.ts
@@ -2242,19 +2242,16 @@ namespace ts {
      */
     export function ensureUseStrict(node: SourceFile): SourceFile {
         let foundUseStrict = false;
-        let statementOffset = 0;
-        const numStatements = node.statements.length;
-        while (statementOffset < numStatements) {
-            const statement = node.statements[statementOffset];
+        for (const statement of node.statements) {
             if (isPrologueDirective(statement)) {
                 if (isUseStrictPrologue(statement as ExpressionStatement)) {
                     foundUseStrict = true;
+                    break;
                 }
             }
             else {
                 break;
             }
-            statementOffset++;
         }
         if (!foundUseStrict) {
             const statements: Statement[] = [];
diff --git a/src/compiler/transformers/ts.ts b/src/compiler/transformers/ts.ts
index 112f838a3704e..2c146c91bc3ac 100644
--- a/src/compiler/transformers/ts.ts
+++ b/src/compiler/transformers/ts.ts
@@ -436,7 +436,7 @@ namespace ts {
         function visitSourceFile(node: SourceFile) {
             currentSourceFile = node;
 
-            // ensure "use strict"" is emitted in all scenarios in alwaysStrict mode
+            // ensure "use strict" is emitted in all scenarios in alwaysStrict mode
             if (compilerOptions.alwaysStrict) {
                 node = ensureUseStrict(node);
             }