source_gen

• Fix LibraryReader.classElements to return classes from parts, if they exist, as well as from the defining library file.

• Introduce SharedPartBuilder for creating part files that can be merged with a new CombiningBuilder. Note that CombiningBuilder only outputs .g.dart files.
• Breaking PartBuilder now requires a generatedExtensions argument. The value should not be .g.dart. To produce .g.dart files please use the SharedPartBuilder.

• Allow using non-dev Dart 2 SDK.

• GeneratorForAnnotation
  • generateForAnnotatedElement now allow multiple return values when implementations return an Iterable or Stream.
  • Values from generateForAnnotatedElement have whitespace trimmed. null and empty values are ignored.
  • Duplicate values are collapsed into a single values. This allows emitting shared, top-level members without naming collisions.

• Simplification to the output of generator names in header sections.

• Update handling of whitespace in generator outputs.

  • If the output from a generator has wrapping whitespace, it is trimmed.
  • If the output from a generator is empty or whitespace-only, it is ignored.
  • These changes will likely have no effect on output, unless you customize the code formatter.

• Support package:analyzer 0.32.0.

• Eliminate redundant new lines in the core builder. These were almost removed by running the default formatter. Now the unformatted code more closely matches the default output.

• More redundant new lines elimination.

• Cleanup logging output that duplicates headers provided by package:build_runner.

• InvalidGenerationSourceError added an optional element parameter to support more helpful error messages.

• BREAKING removed the deprecated requireLibraryDirective parameter in PartBuilder.

• Revivable no longer throws a type error when attempting to revive a reference to a top-level function or static-class method. Now is returns a reference to that function or method, as expected.

• TypeChecker now throws an UnresolvedAnnotationException with a more detailed exception body (and properties useful for further debugging) instead of Could not resolve @null.

• LibraryBuilder and PartBuilder now have a more readable toString(), which is useful when emitting a warning or error in a build system. For example you may see Generating .g.dart: MyBuilder instead of Instance of LibraryBuilder in your build logs.

• The PartBuilder constructor parameter requireLibraryDirective now defaults to false. It will be removed in 0.8.0.

• Require at least Dart 2.0.0-dev.19.0.

• Removed a log.finest with the output source of each generator. This allows a verbose option (-v) for tools like bazel or build_runner to be much more readable and debuggable. Files are emitted to disk for inspection in any case.

• BUG FIX: ConstantReader.revive() now properly returns no URL fragment when the constant expression is resolved from a top-level or static-field. The documentation had said otherwise, and it was impossible to tell the difference between a constructor and a field. Now, fields are always in the form of accessor = {clazz}.{field} or {topLevelField}.

• Fix file URIs on windows.

• Support the latest analyzer package.

• Added typeNameOf, which is a safe way to get the name of a DartType, even when the type is a FunctionType, which has a null name in newer versions of the Dart analyzer.

• Added LibraryReader.pathToUrl(Uri|String), which computes the import or export path necessary to reach the provided URL from the current library. Also added pathToAsset and pathToElement as convenience functions.

• Expanded package:build support to allow version 0.12.0.

• Allow null and empty outputs form GeneratorForAnnotation.

• Allow package:build version 0.11.0

• Support an optional header argument to PartBuilder and LibraryBuilder.

Generator{ForAnnotation}

• Return type of generate{ForAnnotatedElement} is now FutureOr<String>.

LibraryReader

• Added annotatedElements to return all elements annotated with something.
• Added classElements getter for returning all class-es in a library.

TypeChecker

• Added hasAnnotationOf and hasAnnotationOfExact.

ConstantReader

• Added isAny (for consistency, but deprecated) and isLiteral.
• Added literalValue as an alias for the now deprecated anyValue.
• Allow literalValue to return null if the value is actually null.
• Fixed a bug where a Symbol would return as a String for anyValue.
• Fixed a bug where a List and Map were not considered literals.

• 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.

• Added spanForElement; returns a SourceSpan for an analyzer Element.
• Logs a warning to the console when a GeneratorBuilder outputs a part file for a given input, but that input does not define part 'name.g.dart';.

• Tighten constraint on source_span.

• Breaking change: TypeChecker#annotationsOf|firstAnnotationOf now returns annotations that are assignable to the TypeChecker's type. As a result we've added #annotationsOfExact|firstAnnotationOfExact which has the old behavior for precise checks.
• TypeChecker#annotations...-methods now throw a StateError if one or more annotations on an element are not resolvable. This is usually a sign of a misspelling, missing import, or missing dependency.
• Added TypeChecker.any, which delegates to multiple other TypeChecker implementations when making a type check.

• Bug fixes:
  • Do not fail when "library" is omitted but nothing would be output.
  • Do not fail on extensions that don't end in ".dart" (valid use case).

• Update minimum analyzer package to 0.29.10.

• Update the minimum Dart SDK to 1.22.1.

• Deprecated builder.dart: import source_gen.dart instead.

• Added TypeChecker, a high-level API for performing static type checks:

  import 'package:analyzer/dart/element/type.dart';
  import 'package:source_gen/source_gen.dart';
  
  void checkType(DartType dartType) {
    // Checks compared to runtime type `SomeClass`.
    print(const TypeChecker.forRuntime(SomeClass).isExactlyType(dartType));
  
    // Checks compared to a known Url/Symbol:
    const TypeChecker.forUrl('package:foo/foo.dart#SomeClass');
  
    // Checks compared to another resolved `DartType`:
    const TypeChecker.forStatic(anotherDartType);
  }
  

• Failing to add a library directive to a library that is being used as a generator target that generates partial files (part of) is now an explicit error that gives a hint on how to name and fix your library:

  > Could not find library identifier so a "part of" cannot be built.
  >
  > Consider adding the following to your source file:
  >
  > "library foo.bar;"
  

  In Dart SDK >=1.25.0 this can be relaxed as part of can refer to a path. To opt-in, GeneratorBuilder now has a new flag, requireLibraryDirective. Set it to false, and also set your sdk constraint appropriately:

    sdk: '>=1.25.0 <2.0.0'
  

• Added LibraryReader, a utility class for LibraryElement that exposes high-level APIs, including findType, which traverses export directives for publicly exported types. For example, to find Generator from package:source_gen/source_gen.dart:

  void example(LibraryElement pkgSourceGen) {
    var library = new LibraryReader(pkgSourceGen);
  
    // Instead of pkgSourceGen.getType('Generator'), which is null.
    library.findType('Generator');
  }
  

• Added ConstantReader, a high-level API for reading from constant (static) values from Dart source code (usually represented by DartObject from the analyzer package):

  abstract class ConstantReader {
    factory ConstantReader(DartObject object) => ...
  
    // Other methods and properties also exist.
  
    /// Reads[ field] from the constant as another constant value.
    ConstantReader read(String field);
  
    /// Reads [field] from the constant as a boolean.
    ///
    /// If the resulting value is `null`, uses [defaultTo] if defined.
    bool readBool(String field, {bool defaultTo()});
  
    /// Reads [field] from the constant as an int.
    ///
    /// If the resulting value is `null`, uses [defaultTo] if defined.
    int readInt(String field, {int defaultTo()});
  
    /// Reads [field] from the constant as a string.
    ///
    /// If the resulting value is `null`, uses [defaultTo] if defined.
    String readString(String field, {String defaultTo()});
  }
  

• Add formatOutput optional parameter to the GeneratorBuilder constructor. This is a lambda of the form String formatOutput(String originalCode) which allows you do do custom formatting.

• Support for package:analyzer 0.30.0

• Support for package:build 0.9.0

• Support package:build 0.8.x
• Less verbose errors when analyzer fails to resolve the input.

• Give more information when dartfmt fails.

• Use the new log field instead of the deprecated buildStep.logger

• Support the latest release of pkg/dart_style.

• Update to latest build, build_runner, and build_test releases.

• Don't throw when running against a non-library asset and getting no LibraryElement

• BugFix: Always release the Resolver instance, even when generation does not run

• Add matchTypes method. As with anything imported from /src/ this is use-at-your-own-risk since it is not guaranteed to be stable
• Internal cleanup
  • Drop some unused utility methods
  • Move cli_util to dev_dependencies
  • Avoid some deprecated analyzer apis
  • Syntax tweaks
  • Drop results.dart which had no usages

• Use library URIs (not names) to look up annotations in the mirror system.
• Loosen version constraint to allow package:build version 0.6
• Fix a bug against the latest SDK checking whether List implements Iterable

• Support the latest version of build package.

• Avoid calling computeNode() while instantiating annotation values

• Upgrade to be compatible with the breaking changes in analyzer 0.28.0

• Support package:analyzer 0.29.0

• Remove "experimental" comment in README.md.

• Support the latest version of pkg/build.

• Generate valid strong-mode code for typed lists.

• Added GeneratorBuilder option isStandalone to generate files that aren't part of source file.

• Support the latest version of pkg/build.

• Remove an outdated work-around.

• Make strong-mode clean.

• Fixed multi-line error output.

• Breaking: Switch to the build package for running Generators. This means that the top level build and generate functions are no longer available, and have been replaced by the top level build, watch, and serve functions from the build package, and the GeneratorBuilder class. See tool/build.dart, tool/watch.dart, and tool/phases.dart for usage.

  • Note that the build package is experimental, and likely to change.

• Breaking: The build package provides an abstraction for reading/writing files via the BuildStep class, and that is now also provided to Generator#generate and GeneratorForAnnotation#generateForAnnotatedElement as a second argument.

• Timestamps are no longer included in generated code.

• There is no longer a need to specify the files related to an individual generator via AssociatedFileSet. Simply use the BuildStep instance to read and write files and the build package will track any files you read in and run incremental rebuilds as necessary.

• Added support for Symbol and Type in annotations.

• Improved error output when unable to create an instance from an annotation.

• Upgrade to analyzer '^0.27.0'.

• Upgrade to analyzer '^0.27.1' and removed a work-around for a fixed analyzer issue.

• JsonSerializableGenerator now supports classes with read-only properties.

• JsonSerializable: Added JsonKey annotation.

• Improved output of generation errors and stack traces.

• Require analyzer '^0.26.2'.