handleFutureWithMapper<T, S> function

JSPromise<JSAny?> handleFutureWithMapper<T, S>(Future<T> future, Func1<T, S> mapper)

Handles the Future object with the provided mapper function.

Implementation

JSPromise handleFutureWithMapper<T, S>(
  Future<T> future,
  Func1<T, S> mapper,
) {
  return JSPromise((JSFunction resolve, JSFunction reject) {
    future.then<void>((T value) {
      final Object? target = mapper(value);
      final JSAny? jsVal = target?.jsify();
      resolve.callAsFunction(resolve, jsVal);
    }, onError: (Object error, StackTrace stackTrace) {
      final errorConstructor =
          globalContext.getProperty('Error'.toJS)! as JSFunction;
      final wrapper = errorConstructor
          .callAsConstructor<JSObject>('Dart exception: $error'.toJS);
      wrapper['error'] = error.toJSBox;
      wrapper['stack'] = stackTrace.toString().toJS;
      reject.callAsFunction(reject, wrapper);
    });
  }.toJS);
}