ParameterizedAsyncTask<T, R> typedef
ParameterizedAsyncTask<T, R> =
FutureOr<R> Function(T? param)
Task used by fetcher widgets to fetch data.
May return the value directly (not a Future) to skip the loader: see FetchBuilder.
Implementation
typedef ParameterizedAsyncTask<T, R> = FutureOr<R> Function(T? param);