dart-lang/source_gen v0.7.0 on GitHub

Breaking changes: See the wiki
for help upgrading.
- Generator.generate now operates on a LibraryReader rather than being
  called for every Element within a library. Generators can iterate over
  elements using LibraryReader.allElements. GeneratorForAnnotation will
  continue to call generateForAnnotatedElement repeatedly for each element.
- GeneratorForAnnotation passes in a ConstantReader for the annotation
  instance rather than re-creating it using mirrors.
- GeneratorBuilder is replaced with PartBuilder and LibraryBuilder
  depending on whether the output is meant to be included in a part file.
- Removed JsonSerializable and related classes. These are moved to
  package:json_serializable.
- Removed lib/builder.dart. Import through source_gen.dart instead.
- Removed OutputFormatter typedef.
Add LibraryReader.allElements - a utility to iterate across all Element
instances contained in Dart library.
Add LibraryReader.element to get back to the LibraryElement instance.
Add ConstantReader.objectValue to get back to the DartObject instance.
Add ConstantReader.peek to read a value that returns null if not found:

// Tries to read the field "token" first, then "_token".
findTokenField(DartObject o) {
  final reader = new ConstantReader(o);
  final token = o.peek('token') ?? o.read('_token');
}

Add throwOnUnresolved optional parameter to TypeChecker.annotationsOf,
TypeChecker.annotationsOfExact, TypeChecker.firstAnnotationOf, and
TypeChecker.firstAnnotationOfExact. Setting this to false will enable you
to check for matching annotations with incomplete type information (at your
own risk).
Builder logs now log the primary inputs AssetId instead of the library,
which is more useful for tracking down the actual files.