meta

1.11.0

• Introduce TargetKind.extensionType to indicate that an annotation is valid on any extension type declaration.

1.10.0

• Introduce @redeclare to annotate extension type members that redeclare members from a superinterface.
• Migrate the TargetKind enum to a class to ease the addition of new kinds.

1.9.1

• Update SDK constraints to >=2.12.0 <4.0.0.
• Mark @reopen stable.

1.9.0

• Introduce @reopen to annotate class or mixin declarations that can safely extend classes marked base, final or interface.
• Introduce @MustBeOverridden to annotate class or mixin members which must be overridden in all subclasses.
• Deprecate @alwaysThrows, which can be replaced by using a return type of 'Never'.

1.8.0

• Add @UseResult.unless.
• The mechanism behind noInline and tryInline from dart2js.dart has been changed. This should not affect the use of these annotations in practice.

1.7.0

• Restore TargetKindExtension and get displayString. We published analyzer 1.7.2 that is compatible with TargetKindExtension.

2.0.0 - removed

• Restore TargetKindExtension and get displayString.

1.6.0

• Remove TargetKindExtension. Adding it was a breaking change, because there are clients, e.g. analyze 1.7.0, that also declare an extension on TargetKind, and also declare get displayString. This causes a conflict.

1.5.0

• Add TargetKindExtension.displayString.

1.4.0

• Introduce TargetKind.topLevelVariable that indicates that an annotation is valid on any top-level variable declaration.
• Introduce @useResult to annotate methods, fields, or getters that return values that should be used - stored, passed as arguments, etc.
• Updates for documentation.

1.3.0

• Stable release for null safety.

1.3.0-nullsafety.6

• Update SDK constraints to >=2.12.0-0 <3.0.0 based on beta release guidelines.

1.3.0-nullsafety.5

• Allow prerelease versions of the 2.12 sdk.

1.3.0-nullsafety.4

• Introduce @internal to annotate elements that should not be used outside of the package in which the element is declared.

1.3.0-nullsafety.3

• Allow 2.10 stable and 2.11.0 dev SDK versions.

1.3.0-nullsafety.2

• Update for the 2.10 dev sdk.

1.3.0-nullsafety.1

• Allow the <=2.9.10 stable sdk.

1.3.0-nullsafety

• Opt into null safety.

1.2.2

• Removed unawaited because the attempt to move it from package:pedantic caused too many issues. If you see errors about unawaited being declared in two places, please update the version constraints for meta to 1.2.2 or later.

1.2.1

• Fixed a bug by adding an import of dart:async so that the code really is compatible with the lower bound of the SDK constraints.

1.2.0

• Introduce unawaited to mark invocations that return a Future where it's intentional that the future is not being awaited. (Moved from package:pedantic.)
• Introduce @doNotStore to annotate methods, getters and functions to indicate that values obtained by invoking them should not be stored in a field or top-level variable.

1.1.8

• Introduce @nonVirtual to annotate instance members that should not be overridden in subclasses or when mixed in.

1.1.7

• Introduce @sealed to declare that a class or mixin is not allowed as a super-type.

  Only classes in the same package as a class or mixin annotated with @sealed may extend, implement or mix-in the annotated class or mixin. (SDK issue 27372).

1.1.6

• Set max SDK version to <3.0.0.

1.1.5

• Introduce @isTest and @isTestGroup to declare a function that is a test, or a test group.

1.1.4

• Added dart2js.dart.

1.1.2

• Rollback SDK constraint update for 2.0.0. No longer needed.

1.1.1

• Update SDK constraint to be 2.0.0 dev friendly.

1.1.0

• Introduce @alwaysThrows to declare that a function always throws (SDK issue 17999). This is first available in Dart SDK 1.25.0-dev.1.0.

  import 'package:meta/meta.dart';
  
  // Without knowing that [failBigTime] always throws, it looks like this
  // function might return without returning a bool.
  bool fn(expected, actual) {
    if (expected != actual)
      failBigTime(expected, actual);
    else
      return True;
  }
  
  @alwaysThrows
  void failBigTime(expected, actual) {
    throw new StateError('Expected $expected, but was $actual.');
  }
  

1.0.5

• Introduce @experimental to annotate a library, or any declaration that is part of the public interface of a library (such as top-level members, class members, and function parameters) to indicate that the annotated API is experimental and may be removed or changed at any-time without updating the version of the containing package, despite the fact that it would otherwise be a breaking change.

1.0.4

• Introduce @virtual to allow field overrides in strong mode (SDK issue 27384).

  import 'package:meta/meta.dart' show virtual;
  class Base {
    @virtual int x;
  }
  class Derived extends Base {
    int x;
  
    // Expose the hidden storage slot:
    int get superX => super.x;
    set superX(int v) { super.x = v; }
  }
  

1.0.3

• Introduce @checked to override a method and tighten a parameter type (SDK issue 25578).

  import 'package:meta/meta.dart' show checked;
  class View {
    addChild(View v) {}
  }
  class MyView extends View {
    // this override is legal, it will check at runtime if we actually
    // got a MyView.
    addChild(@checked MyView v) {}
  }
  main() {
    dynamic mv = new MyView();
    mv.addChild(new View()); // runtime error
  }
  

1.0.2

• Introduce @visibleForTesting annotation for declarations that may be referenced only in the library or in a test.

1.0.1

• Updated @factory to allow statics and methods returning null.

1.0.0

• First stable API release.

0.12.2

• Updated @protected to include implemented interfaces (linter#252).

0.12.1

• Fixed markdown in dartdocs.

0.12.0

• Introduce @optionalTypeArgs annotation for classes whose type arguments are to be treated as optional.

0.11.0

• Added new Required constructor with a means to specify a reason to explain why a parameter is required.

0.10.0

• Introduce @factory annotation for methods that must either be abstract or must return a newly allocated object.
• Introduce @literal annotation that indicates that any invocation of a constructor must use the keyword const unless one or more of the arguments to the constructor is not a compile-time constant.

0.9.0

• Introduce @protected annotation for members that must only be called from instance members of subclasses.
• Introduce @required annotation for optional parameters that should be treated as required.
• Introduce @mustCallSuper annotation for methods that must be invoked by all overriding methods.