Run side effects in a chain of IOEither using fpdart

fpdart_io_either_extension.dart

extension IOExtension<L, R> on IOEither<L, R> {
  IOEither<L, R> runSideEffect({
    final void Function(L l)? onLeft,
    final void Function(R r)? onRight,
  }) =>
      chainFirst(
        (r) => IOEither<L, void>.fromIO(
          IO(() => onRight?.call(r)),
        ),
      )
          .swap()
          .chainFirst(
            (r) => IOEither<R, void>.fromIO(
              IO(() => onLeft?.call(r)),
            ),
          )
          .swap();
}