How to use the @marblejs/core.EventError function in @marblejs/core

test('handles error if error$ is defined', () => {
    // given
    const client = { sendResponse: jest.fn() } as any as MarbleWebSocketClient;
    const error = new EventError({ type: 'EVENT' }, '');
    const error$: WsErrorEffect = event$ => event$.pipe(
      mapTo({ type: error.event.type, error: {} }),
    );

    // when
    handleEffectsError(defaultMetadata, client, error$)(error);

    // then
    expect(client.sendResponse).toHaveBeenCalled();
  });

test('returns stream of error events for defined error object', () => {
    // given
    const incomingEvent = { type: 'TEST_EVENT' };
    const error = new EventError(incomingEvent, 'Test error message', { errorData: 'test_error_data' });
    const outgoingEvent = {
      type: incomingEvent.type,
      error: {
        message: error.message,
        data: error.data,
      },
    };

    // then
    Marbles.assertEffect(error$, [
      ['--a--', { a: incomingEvent }],
      ['--b--', { b: outgoingEvent }],
    ], { meta: { error } });
  });

test('does nothing if error$ is undefined', () => {
    // given
    const client = { sendResponse: jest.fn() } as any as MarbleWebSocketClient;
    const error = new EventError({ type: 'EVENT' }, '');

    // when
    handleEffectsError(defaultMetadata, client, undefined)(error);

    // then
    expect(client.sendResponse).not.toHaveBeenCalled();
  });
});

        mergeMap(event => throwError(new EventError(event, 'test message'))),
      );

catchError((error: IOError) => throwError(
            new EventError(event as any, error.message, error.data),
          )),
        )),