Dart Documentationmeta

meta library

Constants for use in metadata annotations such as @deprecated, @override, and @proxy.

Annotations provide semantic information that tools can use to provide a better user experience. For example, an IDE might not autocomplete the name of a function that's been marked @deprecated, or it might display the function's name differently.

For information on installing and importing this library, see the meta package on pub.dartlang.org. For examples of using annotations, see Metadata in the language tour.

Properties

const deprecated #

An annotation used to mark a class, field, getter, setter, method, top-level variable, or top-level function as one that should no longer be used. Tools can use this annotation to provide a warning on references to the marked element.

const deprecated = const _Deprecated()

const override #

An annotation used to mark an instance member (method, field, getter or setter) as overriding an inherited class member. Tools can use this annotation to provide a warning if there is no overridden member.

const override = const _Override()

const proxy #

An annotation used to mark a class that should be considered to implement every possible getter, setter and method. Tools can use this annotation to suppress warnings when there is no explicit implementation of a referenced member. Tools should provide a hint if this annotation is applied to a class that does not implement or inherit an implementation of the method noSuchMethod (other than the implementation in Object). Note that classes are not affected by the use of this annotation on a supertype.

const proxy = const _Proxy()