meta 1.9.0 changelog | Dart package

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.

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