anchor.diff:      var moduleFormat = moduleFormats[i];
       var file = File(output);
       await file.parent.create(recursive: true);
  +    var mapUrl = p.toUri('$output.map').toString();
       var jsCode = jsProgramToCode(jsModule, moduleFormat,
           buildSourceMap: options.sourceMap,
           inlineSourceMap: options.inlineSourceMap,
           jsUrl: p.toUri(output).toString(),
  -        mapUrl: p.toUri(output + '.map').toString(),
  +        mapUrl: mapUrl,
           customScheme: multiRootScheme,
           multiRootOutputPath: multiRootOutputPath,
           component: compiledLibraries);
  
positive.code:         help: 'The path to the libraries.json file for the sdk.')
      ..addOption('used-inputs-file',
          help: 'If set, the file to record inputs used.', hide: true)
      ..addFlag('kernel',
          abbr: 'k',
          help: 'Deprecated and ignored. To be removed in a future release.',
  
negative.code:     outFiles.add(file.writeAsString(jsCode.code));
      if (jsCode.sourceMap != null) {
        outFiles.add(
            File('$output.map').writeAsString(json.encode(jsCode.sourceMap)));
      }
  
      if (argResults['experimental-emit-debug-metadata'] as bool) {
        var moduleMetadata = [
          for (var lib in compiledLibraries.libraries)
            {
              'name': compiler.jsLibraryName(lib),
              'sourceMapFileUri': mapUrl,
              'dartFileUris': [
                lib.fileUri.toString(),
                ...lib.parts.map((p) => p.partUri.toString())
              ],
            }
        ];
        outFiles.add(
            File('$output.metadata').writeAsString(json.encode(moduleMetadata)));
      }
    }
  
  