Use the same resources for all Resolvers

Author: jakemac53

lib/src/builder/build_step_impl.dart

@@ -23,7 +23,8 @@ import 'exceptions.dart';
 class BuildStepImpl implements BuildStep {
   /// Single `_resolvers` instance for all [BuildStepImpl]s
   static code_transformers.Resolvers _resolvers =
-      new code_transformers.Resolvers(code_transformers.dartSdkDirectory);
+      new code_transformers.Resolvers(code_transformers.dartSdkDirectory,
+          useSharedSources: true);
 
   /// The primary input for this build step.
   @override

pubspec.yaml

@@ -10,7 +10,7 @@ environment:
 dependencies:
   analyzer: ^0.27.1
   barback: ^0.15.0
-  code_transformers: ^0.4.0
+  code_transformers: ^0.4.1
   logging: ^0.11.2
   glob: ^1.1.0
   path: ^1.1.0