From 2abc7369554e5716e3c1a3e3e85cedb2138c0ce7 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <drosen@microsoft.com>
Date: Thu, 7 Apr 2016 00:55:02 -0700
Subject: [PATCH 1/5] Ensure that the entire contents of the prologue are
 simply 'use strict'.

---
 src/compiler/factory.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/compiler/factory.ts b/src/compiler/factory.ts
index f7aa18fa7ea..0fd423d342c 100644
--- a/src/compiler/factory.ts
+++ b/src/compiler/factory.ts
@@ -1204,7 +1204,7 @@ namespace ts {
     // Utilities
 
     function isUseStrictPrologue(node: ExpressionStatement): boolean {
-        return !!(node.expression as StringLiteral).text.match(/use strict/);
+        return (node.expression as StringLiteral).text === "use strict";
     }
 
     export function addPrologueDirectives(target: Statement[], source: Statement[], ensureUseStrict?: boolean): number {

From c57e54eeae5fd3d13c93cb21cc34888b5d43d862 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <drosen@microsoft.com>
Date: Thu, 7 Apr 2016 00:41:40 -0700
Subject: [PATCH 2/5] Added test.

---
 tests/cases/compiler/useStrictLikePrologueString01.ts | 7 +++++++
 1 file changed, 7 insertions(+)
 create mode 100644 tests/cases/compiler/useStrictLikePrologueString01.ts

diff --git a/tests/cases/compiler/useStrictLikePrologueString01.ts b/tests/cases/compiler/useStrictLikePrologueString01.ts
new file mode 100644
index 00000000000..b76e38ebb06
--- /dev/null
+++ b/tests/cases/compiler/useStrictLikePrologueString01.ts
@@ -0,0 +1,7 @@
+//@target: commonjs
+//@target: es5
+
+"hey!"
+" use strict "
+export function f() {   
+}
\ No newline at end of file

From 3a35aa30da5a1ca2dd40b1f52467aa48ec3b0a36 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <drosen@microsoft.com>
Date: Thu, 7 Apr 2016 00:42:04 -0700
Subject: [PATCH 3/5] Accepted baselines.

---
 .../reference/useStrictLikePrologueString01.js      | 13 +++++++++++++
 .../reference/useStrictLikePrologueString01.symbols |  7 +++++++
 .../reference/useStrictLikePrologueString01.types   | 11 +++++++++++
 3 files changed, 31 insertions(+)
 create mode 100644 tests/baselines/reference/useStrictLikePrologueString01.js
 create mode 100644 tests/baselines/reference/useStrictLikePrologueString01.symbols
 create mode 100644 tests/baselines/reference/useStrictLikePrologueString01.types

diff --git a/tests/baselines/reference/useStrictLikePrologueString01.js b/tests/baselines/reference/useStrictLikePrologueString01.js
new file mode 100644
index 00000000000..12cec220725
--- /dev/null
+++ b/tests/baselines/reference/useStrictLikePrologueString01.js
@@ -0,0 +1,13 @@
+//// [useStrictLikePrologueString01.ts]
+
+"hey!"
+" use strict "
+export function f() {   
+}
+
+//// [useStrictLikePrologueString01.js]
+"hey!";
+" use strict ";
+function f() {
+}
+exports.f = f;
diff --git a/tests/baselines/reference/useStrictLikePrologueString01.symbols b/tests/baselines/reference/useStrictLikePrologueString01.symbols
new file mode 100644
index 00000000000..e96d48d9933
--- /dev/null
+++ b/tests/baselines/reference/useStrictLikePrologueString01.symbols
@@ -0,0 +1,7 @@
+=== tests/cases/compiler/useStrictLikePrologueString01.ts ===
+
+"hey!"
+" use strict "
+export function f() {   
+>f : Symbol(f, Decl(useStrictLikePrologueString01.ts, 2, 14))
+}
diff --git a/tests/baselines/reference/useStrictLikePrologueString01.types b/tests/baselines/reference/useStrictLikePrologueString01.types
new file mode 100644
index 00000000000..a12dfe3abd3
--- /dev/null
+++ b/tests/baselines/reference/useStrictLikePrologueString01.types
@@ -0,0 +1,11 @@
+=== tests/cases/compiler/useStrictLikePrologueString01.ts ===
+
+"hey!"
+>"hey!" : string
+
+" use strict "
+>" use strict " : string
+
+export function f() {   
+>f : () => void
+}

From 1e18618170ae03c8a6c1ffecd4961db96ac682cc Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <drosen@microsoft.com>
Date: Thu, 7 Apr 2016 00:47:29 -0700
Subject: [PATCH 4/5] Ensure that the entire contents are simply 'use strict'.

---
 src/compiler/emitter.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/compiler/emitter.ts b/src/compiler/emitter.ts
index d132e12e793..bb4d179704c 100644
--- a/src/compiler/emitter.ts
+++ b/src/compiler/emitter.ts
@@ -7636,7 +7636,7 @@ const _super = (function (geti, seti) {
             }
 
             function isUseStrictPrologue(node: ExpressionStatement): boolean {
-                return !!(node.expression as StringLiteral).text.match(/use strict/);
+                return (node.expression as StringLiteral).text === "use strict";
             }
 
             function ensureUseStrictPrologue(startWithNewLine: boolean, writeUseStrict: boolean) {

From cfb9001e188370d177643ee2672bc927a4f5b120 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <drosen@microsoft.com>
Date: Thu, 7 Apr 2016 00:48:11 -0700
Subject: [PATCH 5/5] Accepted baselines.

---
 tests/baselines/reference/useStrictLikePrologueString01.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tests/baselines/reference/useStrictLikePrologueString01.js b/tests/baselines/reference/useStrictLikePrologueString01.js
index 12cec220725..56df03abfe5 100644
--- a/tests/baselines/reference/useStrictLikePrologueString01.js
+++ b/tests/baselines/reference/useStrictLikePrologueString01.js
@@ -8,6 +8,7 @@ export function f() {
 //// [useStrictLikePrologueString01.js]
 "hey!";
 " use strict ";
+"use strict";
 function f() {
 }
 exports.f = f;