Adding package:smoke. This CL includes the intial APIs, a mirror-based

pkg/smoke/lib/src/default_transformer.dart

+// Copyright (c) 2014, 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.
+
+/// Transformer that replaces the default mirror-based implementation of smoke,
+/// so that during deploy smoke doesn't include any dependency on dart:mirrors.
+library smoke.src.default_transformer;
+
+import 'dart:async';
+import 'package:barback/barback.dart';
+
+/// Replaces the default mirror-based implementation of smoke in
+/// `pacakge:smoke/implementation.dart`, so that during deploy smoke doesn't
+/// include any dependency on dart:mirrors.
+// TODO(sigmund): include tests that run this transformation automatically.
+class DefaultTransformer extends Transformer {
+  DefaultTransformer.asPlugin();
+
+  /// Only apply to `lib/src/implementation.dart`.
+  Future<bool> isPrimary(Asset input) => new Future.value(
+      input.id.package == 'smoke' &&
+      input.id.path == 'lib/src/implementation.dart');
+
+  Future apply(Transform transform) {
+    var id = transform.primaryInput.id;
+    return transform.primaryInput.readAsString().then((code) {
+      // Note: this rewrite is highly-coupled with how implementation.dart is
+      // written. Make sure both are updated in sync.
+      transform.addOutput(new Asset.fromString(id, code
+          .replaceAll(new RegExp('new Reflective[^;]*;'),
+              'throwNotConfiguredError();')
+          .replaceAll("import 'package:smoke/mirrors.dart';", '')));
+    });
+  }
+}
+