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Revert "Remove deprecated Typematcher (#73751)" (#75734)

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This reverts commit fe003535902ec93917c75d9b9d5bf6661181a1df.
This commit is contained in:
Kate Lovett 2021-02-09 15:56:13 -06:00 committed by GitHub
parent fe00353590
commit 3d2e65f713
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1 changed files with 17 additions and 0 deletions
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17
packages/flutter/lib/src/widgets/framework.dart
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@ -258,6 +258,23 @@ class GlobalObjectKey<T extends State<StatefulWidget>> extends GlobalKey<T> {
}
}
/// This class is a work-around for the "is" operator not accepting a variable value as its right operand.
///
/// This class is deprecated. It will be deleted soon.
// TODO(a14n): Remove this when it goes to stable, https://github.com/flutter/flutter/pull/44189
@Deprecated(
'TypeMatcher has been deprecated because it is no longer used in framework(only in deprecated methods). '
'This feature was deprecated after v1.12.1.'
)
@optionalTypeArgs
class TypeMatcher<T> {
/// Creates a type matcher for the given type parameter.
const TypeMatcher();
/// Returns true if the given object is of type `T`.
bool check(dynamic object) => object is T;
}
/// Describes the configuration for an [Element].
///
/// Widgets are the central class hierarchy in the Flutter framework. A widget