Merge branch 'rberner-master'

src/Module.js

@@ -452,6 +452,11 @@ export default class Module {
 
 		this.statements.forEach( statement => {
 			if ( !statement.isIncluded ) {
+				if ( statement.node.type === 'ImportDeclaration' ) {
+					magicString.remove( statement.node.start, statement.next );
+					return;
+				}
+
 				magicString.remove( statement.start, statement.next );
 				return;
 			}

test/form/comment-before-import/_config.js

@@ -0,0 +1,3 @@
+module.exports = {
+	description: 'preserves comments before imports'
+};

test/form/comment-before-import/_expected/amd.js

@@ -0,0 +1,12 @@
+define(function () { 'use strict';
+
+	// bar.js
+	var bar = 21;
+
+	// foo.js
+	var foo = bar * 2;
+
+	// main.js
+	console.log( foo );
+
+});

test/form/comment-before-import/_expected/cjs.js

@@ -0,0 +1,10 @@
+'use strict';
+
+// bar.js
+var bar = 21;
+
+// foo.js
+var foo = bar * 2;
+
+// main.js
+console.log( foo );

test/form/comment-before-import/_expected/es.js

@@ -0,0 +1,8 @@
+// bar.js
+var bar = 21;
+
+// foo.js
+var foo = bar * 2;
+
+// main.js
+console.log( foo );

test/form/comment-before-import/_expected/iife.js

@@ -0,0 +1,13 @@
+(function () {
+	'use strict';
+
+	// bar.js
+	var bar = 21;
+
+	// foo.js
+	var foo = bar * 2;
+
+	// main.js
+	console.log( foo );
+
+}());

test/form/comment-before-import/_expected/umd.js

@@ -0,0 +1,16 @@
+(function (global, factory) {
+	typeof exports === 'object' && typeof module !== 'undefined' ? factory() :
+	typeof define === 'function' && define.amd ? define(factory) :
+	(factory());
+}(this, (function () { 'use strict';
+
+	// bar.js
+	var bar = 21;
+
+	// foo.js
+	var foo = bar * 2;
+
+	// main.js
+	console.log( foo );
+
+})));

test/form/comment-before-import/bar.js

@@ -0,0 +1,2 @@
+// bar.js
+export default 21;

test/form/comment-before-import/foo.js

@@ -0,0 +1,4 @@
+// foo.js
+import bar from './bar.js';
+
+export default bar * 2;

test/form/comment-before-import/main.js

@@ -0,0 +1,4 @@
+// main.js
+import foo from './foo.js';
+
+console.log( foo );