blob: ea28b9e1690548dcccb7dc4003ced7da62ea1663 [file] [log] [blame]
// Copyright (c) 2021, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
import 'package:analyzer_utilities/check/check.dart';
extension IsExtension<T> on CheckTarget<T> {
CheckTarget<U> isA<U extends T>() {
final value = this.value;
if (value is U) {
return nest(value, (_) => 'is of type $U');
} else {
fail('is not of type $U');