add back @btd fix for #1104

src/Bundle.js

@@ -15,7 +15,6 @@ import { mapSequence } from './utils/promise.js';
 import transform from './utils/transform.js';
 import transformBundle from './utils/transformBundle.js';
 import collapseSourcemaps from './utils/collapseSourcemaps.js';
-import SOURCEMAPPING_URL from './utils/sourceMappingURL.js';
 import callIfFunction from './utils/callIfFunction.js';
 import { dirname, isRelative, isAbsolute, normalize, relative, resolve } from './utils/path.js';
 import BundleScope from './ast/scopes/BundleScope.js';
@@ -428,8 +427,7 @@ export default class Bundle {
 		let map = null;
 		const bundleSourcemapChain = [];
 
-		code = transformBundle( code, this.plugins, bundleSourcemapChain, options )
-			.replace( new RegExp( `^\\/\\/# +${SOURCEMAPPING_URL}=.+\\n?`, 'gm' ), '' );
+		code = transformBundle( code, this.plugins, bundleSourcemapChain, options );
 
 		if ( options.sourceMap ) {
 			timeStart( 'sourceMap' );

src/Module.js

@@ -5,7 +5,7 @@ import { assign, blank, deepClone, keys } from './utils/object.js';
 import { basename, extname } from './utils/path.js';
 import getLocation from './utils/getLocation.js';
 import makeLegalIdentifier from './utils/makeLegalIdentifier.js';
-import SOURCEMAPPING_URL from './utils/sourceMappingURL.js';
+import { SOURCEMAPPING_URL_RE } from './utils/sourceMappingURL.js';
 import error from './utils/error.js';
 import relativeId from './utils/relativeId.js';
 import { SyntheticNamespaceDeclaration } from './Declaration.js';
@@ -72,11 +72,14 @@ export default class Module {
 		});
 
 		// remove existing sourceMappingURL comments
-		const pattern = new RegExp( `^\\/\\/# +${SOURCEMAPPING_URL}=.+\\n?`, 'gm' );
-		let match;
-		while ( match = pattern.exec( code ) ) {
-			this.magicString.remove( match.index, match.index + match[0].length );
-		}
+		this.comments = this.comments.filter(comment => {
+			//only one line comment can contain source maps
+			const isSourceMapComment = !comment.block && SOURCEMAPPING_URL_RE.test(comment.text);
+			if (isSourceMapComment) {
+				this.magicString.remove(comment.start, comment.end );
+			}
+			return !isSourceMapComment;
+		});
 
 		this.declarations = blank();
 		this.type = 'Module'; // TODO only necessary so that Scope knows this should be treated as a function scope... messy

src/rollup.js

@@ -4,7 +4,7 @@ import { writeFile } from './utils/fs.js';
 import { assign, keys } from './utils/object.js';
 import { mapSequence } from './utils/promise.js';
 import validateKeys from './utils/validateKeys.js';
-import SOURCEMAPPING_URL from './utils/sourceMappingURL.js';
+import { SOURCEMAPPING_URL } from './utils/sourceMappingURL.js';
 import Bundle from './Bundle.js';
 
 export const VERSION = '<@VERSION@>';

src/utils/sourceMappingURL.js

@@ -3,4 +3,6 @@
 let SOURCEMAPPING_URL = 'sourceMa';
 SOURCEMAPPING_URL += 'ppingURL';
 
-export default SOURCEMAPPING_URL;
+const SOURCEMAPPING_URL_RE = new RegExp( `^#\\s+${SOURCEMAPPING_URL}=.+\\n?` );
+
+export { SOURCEMAPPING_URL, SOURCEMAPPING_URL_RE };

test/form/removes-existing-sourcemap-comments/_expected/amd.js

@@ -5,8 +5,8 @@ define(function () { 'use strict';
 	};
 
 	var str = `
-	//# sourceMappingURL=main.js.map
-	`;
+//# sourceMappingURL=main.js.map
+`;
 
 	console.log( foo(str) );
 

test/form/removes-existing-sourcemap-comments/_expected/iife.js

@@ -6,8 +6,8 @@
 	};
 
 	var str = `
-	//# sourceMappingURL=main.js.map
-	`;
+//# sourceMappingURL=main.js.map
+`;
 
 	console.log( foo(str) );
 

test/form/removes-existing-sourcemap-comments/_expected/umd.js

@@ -9,8 +9,8 @@
 	};
 
 	var str = `
-	//# sourceMappingURL=main.js.map
-	`;
+//# sourceMappingURL=main.js.map
+`;
 
 	console.log( foo(str) );