Adapts source
to be a Stream<T>
.
This allows source
to be used at the new type, but at run-time it must satisfy the requirements of both the new type and its original type.
Data events created by the source stream must also be instances of T
.
static Stream<T> castFrom<S, T>(Stream<S> source) => new CastStream<S, T>(source);
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https://api.dart.dev/stable/2.5.0/dart-async/Stream/castFrom.html