Track Source objects in PackageNames.

lib/src/command/build.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'dart:async';
 
 import 'package:barback/barback.dart';
 import 'package:path/path.dart' as path;
 
 import '../barback/asset_environment.dart';
 import '../exit_codes.dart' as exit_codes;
 import '../io.dart';
 import '../log.dart' as log;
+import '../source/hosted.dart';
 import '../utils.dart';
 import 'barback.dart';
 
 final _arrow = getSpecial('\u2192', '=>');
 
 /// Handles the `build` pub command.
 class BuildCommand extends BarbackCommand {
   String get name => "build";
   String get description => "Apply transformers to build a package.";
   String get invocation => "pub build [options] [directories...]";
@@ skipping 171 matching lines @@
     ensureDir(path.dirname(destPath));
     return createFileFromStream(asset.read(), destPath);
   }
 
   /// If this package depends directly on the `browser` package, this ensures
   /// that the JavaScript bootstrap files are copied into `packages/browser/`
   /// directories next to each entrypoint in [entrypoints].
   Future _copyBrowserJsFiles(Iterable<AssetId> entrypoints, AssetSet assets) {
     // Must depend on the browser package.
     if (!entrypoint.root.immediateDependencies.any(
-        (dep) => dep.name == 'browser' && dep.source == 'hosted')) {
+        (dep) => dep.name == 'browser' && dep.source is HostedSource)) {
       return new Future.value();
     }
 
     // Get all of the subdirectories that contain Dart entrypoints.
     var entrypointDirs = entrypoints
         // Convert the asset path to a native-separated one and get the
         // directory containing the entrypoint.
         .map((id) => path.dirname(path.fromUri(id.path)))
         // Don't copy files to the top levels of the build directories since
         // the normal lib asset copying will take care of that.
@@ skipping 41 matching lines @@
         "end": {
           "line": entry.span.end.line,
           "column": entry.span.end.column
         },
       };
     }
 
     return data;
   }
 }