Make observable transform a barback transform.

pkg/barback/lib/barback.dart

Index: pkg/barback/lib/barback.dart
diff --git a/pkg/barback/lib/barback.dart b/pkg/barback/lib/barback.dart
index 539d732ae12baaf12d85a3d57ebd0018243a673d..ce6a19a6c65bdc71793940e4c9b8528f6c171ffa 100644
--- a/pkg/barback/lib/barback.dart
+++ b/pkg/barback/lib/barback.dart
@@ -9,5 +9,5 @@ export 'src/asset_id.dart';
 export 'src/barback.dart';
 export 'src/errors.dart';
 export 'src/package_provider.dart';
-export 'src/transform.dart' show Transform;
-export 'src/transformer.dart';
+export 'src/transform.dart' show Transform, Log;

[Bob Nystrom, 2013/08/08 22:47:09]

Maybe "Logger"?

[Siggi Cherem (dart-lang), 2013/08/08 23:10:41]

could be. But since that's currently the name in the logging package, I wonder
if we want to preemptively prevent naming conflicts.

Do we expect to use them for different purposes or do we expect both to
converge? I could also add [span] argument there and use logging.Logger here.

Thoughts? Maybe easier to chat in person?

[nweiz, 2013/08/08 23:34:57]

I don't like the idea of barback exposing either "Log" or "Logger". Both of
those are very likely to cause name conflicts.

[Siggi Cherem (dart-lang), 2013/08/09 00:29:54]

renamed to TransformLogger

+export 'src/transformer.dart';