From 9164f80487ab17165371ddc7b6224250530f82f8 Mon Sep 17 00:00:00 2001
From: Rich-Harris <richard.a.harris@gmail.com>
Date: Sun, 2 Aug 2015 12:46:42 -0400
Subject: [PATCH] remove pre-existing sourcemap comments

---
 src/Module.js                                       |  7 +++++++
 .../removes-existing-sourcemap-comments/_config.js  |  3 +++
 .../_expected/amd.js                                |  9 +++++++++
 .../_expected/cjs.js                                |  7 +++++++
 .../_expected/es6.js                                |  5 +++++
 .../_expected/iife.js                               |  9 +++++++++
 .../_expected/umd.js                                | 13 +++++++++++++
 .../form/removes-existing-sourcemap-comments/foo.js |  5 +++++
 .../removes-existing-sourcemap-comments/main.js     |  5 +++++
 9 files changed, 63 insertions(+)
 create mode 100644 test/form/removes-existing-sourcemap-comments/_config.js
 create mode 100644 test/form/removes-existing-sourcemap-comments/_expected/amd.js
 create mode 100644 test/form/removes-existing-sourcemap-comments/_expected/cjs.js
 create mode 100644 test/form/removes-existing-sourcemap-comments/_expected/es6.js
 create mode 100644 test/form/removes-existing-sourcemap-comments/_expected/iife.js
 create mode 100644 test/form/removes-existing-sourcemap-comments/_expected/umd.js
 create mode 100644 test/form/removes-existing-sourcemap-comments/foo.js
 create mode 100644 test/form/removes-existing-sourcemap-comments/main.js

diff --git a/src/Module.js b/src/Module.js
index 3cf9b8a..70c2ccb 100644
--- a/src/Module.js
+++ b/src/Module.js
@@ -41,6 +41,13 @@ export default class Module {
 			filename: id
 		});
 
+		// remove existing sourceMappingURL comments
+		const pattern = /\/\/#\s+sourceMappingURL=.+\n?/g;
+		let match;
+		while ( match = pattern.exec( source ) ) {
+			this.magicString.remove( match.index, match.index + match[0].length );
+		}
+
 		this.suggestedNames = blank();
 		this.comments = [];
 
diff --git a/test/form/removes-existing-sourcemap-comments/_config.js b/test/form/removes-existing-sourcemap-comments/_config.js
new file mode 100644
index 0000000..e1b917a
--- /dev/null
+++ b/test/form/removes-existing-sourcemap-comments/_config.js
@@ -0,0 +1,3 @@
+module.exports = {
+	description: 'removes existing sourcemap comments'
+};
diff --git a/test/form/removes-existing-sourcemap-comments/_expected/amd.js b/test/form/removes-existing-sourcemap-comments/_expected/amd.js
new file mode 100644
index 0000000..e614344
--- /dev/null
+++ b/test/form/removes-existing-sourcemap-comments/_expected/amd.js
@@ -0,0 +1,9 @@
+define(function () { 'use strict';
+
+	function foo () {
+		return 42;
+	}
+
+	console.log( foo() );
+
+});
diff --git a/test/form/removes-existing-sourcemap-comments/_expected/cjs.js b/test/form/removes-existing-sourcemap-comments/_expected/cjs.js
new file mode 100644
index 0000000..d7a8df2
--- /dev/null
+++ b/test/form/removes-existing-sourcemap-comments/_expected/cjs.js
@@ -0,0 +1,7 @@
+'use strict';
+
+function foo () {
+	return 42;
+}
+
+console.log( foo() );
diff --git a/test/form/removes-existing-sourcemap-comments/_expected/es6.js b/test/form/removes-existing-sourcemap-comments/_expected/es6.js
new file mode 100644
index 0000000..c458828
--- /dev/null
+++ b/test/form/removes-existing-sourcemap-comments/_expected/es6.js
@@ -0,0 +1,5 @@
+function foo () {
+	return 42;
+}
+
+console.log( foo() );
diff --git a/test/form/removes-existing-sourcemap-comments/_expected/iife.js b/test/form/removes-existing-sourcemap-comments/_expected/iife.js
new file mode 100644
index 0000000..07a64a4
--- /dev/null
+++ b/test/form/removes-existing-sourcemap-comments/_expected/iife.js
@@ -0,0 +1,9 @@
+(function () { 'use strict';
+
+	function foo () {
+		return 42;
+	}
+
+	console.log( foo() );
+
+})();
diff --git a/test/form/removes-existing-sourcemap-comments/_expected/umd.js b/test/form/removes-existing-sourcemap-comments/_expected/umd.js
new file mode 100644
index 0000000..79f644c
--- /dev/null
+++ b/test/form/removes-existing-sourcemap-comments/_expected/umd.js
@@ -0,0 +1,13 @@
+(function (global, factory) {
+	typeof exports === 'object' && typeof module !== 'undefined' ? factory() :
+	typeof define === 'function' && define.amd ? define(factory) :
+	factory();
+}(this, function () { 'use strict';
+
+	function foo () {
+		return 42;
+	}
+
+	console.log( foo() );
+
+}));
diff --git a/test/form/removes-existing-sourcemap-comments/foo.js b/test/form/removes-existing-sourcemap-comments/foo.js
new file mode 100644
index 0000000..74fda08
--- /dev/null
+++ b/test/form/removes-existing-sourcemap-comments/foo.js
@@ -0,0 +1,5 @@
+export default function () {
+	return 42;
+}
+
+//# sourceMappingURL=foo.js.map
diff --git a/test/form/removes-existing-sourcemap-comments/main.js b/test/form/removes-existing-sourcemap-comments/main.js
new file mode 100644
index 0000000..3c48af8
--- /dev/null
+++ b/test/form/removes-existing-sourcemap-comments/main.js
@@ -0,0 +1,5 @@
+import foo from './foo';
+
+console.log( foo() );
+
+//# sourceMappingURL=main.js.map