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Return valid type from Future.catchError. #151
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An upcoming feature to the Dart analyzer [0] will report Future.catchError [1] `onError` handlers which return values of invalid type. Currently this is not reported because the `onError` handler function type cannot be accurately expressed. An `onError` handler for `Future<T>.catchError` must be either `FutureOr<T> Function(dynamic)` or `FutureOr<T> Function(dynamic, StackTrace)`. In either case, the return type of the function is `FutureOr<T>`. This CL corrects `onError` handler(s) to return a value of a valid type (typically `null`). [0]: dart-lang/sdk#35825 [1]: https://api.dart.dev/dev/2.12.0-149.0.dev/dart-async/Future/catchError.html
devoncarew
approved these changes
Dec 22, 2020
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An upcoming feature to the Dart analyzer 0 will report Future.catchError 1
onErrorhandlers which return values of invalid type. Currently this is notreported because the
onErrorhandler function type cannot be accuratelyexpressed. An
onErrorhandler forFuture<T>.catchErrormust be eitherFutureOr<T> Function(dynamic)orFutureOr<T> Function(dynamic, StackTrace).In either case, the return type of the function is
FutureOr<T>.This CL corrects
onErrorhandler(s) to return a value of a valid type (typicallynull).