Only pass an AssetId to isPrimary and declareOutputs.

sdk/lib/_internal/pub/lib/src/barback.dart

Index: sdk/lib/_internal/pub/lib/src/barback.dart
diff --git a/sdk/lib/_internal/pub/lib/src/barback.dart b/sdk/lib/_internal/pub/lib/src/barback.dart
index 1c703566cb96b003d3db6cc0ca2537600658766b..02cd3a1eab8945b420bba545f874e34ea94c0885 100644
--- a/sdk/lib/_internal/pub/lib/src/barback.dart
+++ b/sdk/lib/_internal/pub/lib/src/barback.dart
@@ -31,7 +31,7 @@ import 'version.dart';
 ///
 /// Whenever a new non-patch version of barback is published, this *must* be
 /// incremented to synchronize with that.
-final supportedVersions = new VersionConstraint.parse(">=0.11.0 <0.13.0");
+final supportedVersions = new VersionConstraint.parse(">=0.13.0-dev <0.14.0");
 
 /// A list of the names of all built-in transformers that pub exposes.
 const _BUILT_IN_TRANSFORMERS = const ['\$dart2js'];