meta 1.12.0 copy "meta: ^1.12.0" to clipboard
meta: ^1.12.0 copied to clipboard

Annotations used to express developer intentions that can't otherwise be deduced by statically analyzing source code.

1.12.0 #

  • Introduce the @ResourceIdentifier experimental annotation for static methods whose constant literal arguments should be collected during compilation.
  • Indicate that @required and @Required are set to be deprecated for later removal.

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);
        return True;
    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.
pub points



Annotations used to express developer intentions that can't otherwise be deduced by statically analyzing source code.

Repository (GitHub)
View/report issues


API reference


BSD-3-Clause (LICENSE)


Packages that depend on meta