Version 1.7.2

dart/sdk/lib/_internal/pub_generated/lib/src/barback/transformer_cache.dart

 library pub.barback.transformer_cache;
 import 'package:path/path.dart' as p;
 import '../io.dart';
 import '../log.dart' as log;
 import '../package_graph.dart';
 import '../sdk.dart' as sdk;
 import '../utils.dart';
 import 'transformer_id.dart';
 class TransformerCache {
   final PackageGraph _graph;
   Set<TransformerId> _oldTransformers;
   Set<TransformerId> _newTransformers;
   String _dir;
   String get _manifestPath => p.join(_dir, "manifest.txt");
   TransformerCache.load(PackageGraph graph)
       : _graph = graph,
         _dir = graph.entrypoint.root.path(".pub/transformers") {
     _oldTransformers = _parseManifest();
   }
   void clearIfOutdated(Set<String> changedPackages) {
     var snapshotDependencies = unionAll(_oldTransformers.map((id) {
+      if (!_graph.packages.containsKey(id.package)) return new Set();
       return _graph.transitiveDependencies(
           id.package).map((package) => package.name).toSet();
     }));
     if (!overlaps(changedPackages, snapshotDependencies)) return;
     deleteEntry(_dir);
     _oldTransformers = new Set();
   }
   String snapshotPath(Set<TransformerId> transformers) {
     var path = p.join(_dir, "transformers.snapshot");
     if (_newTransformers != null) return path;
@@ skipping 27 matching lines @@
     if (!fileExists(_manifestPath)) return new Set();
     var manifest = readTextFile(_manifestPath).split("\n");
     if (manifest.removeAt(0) != sdk.version.toString()) {
       deleteEntry(_dir);
       return new Set();
     }
     return manifest.single.split(
         ",").map((id) => new TransformerId.parse(id, null)).toSet();
   }
 }