undo(iterationCount = 1) {
    let promise = Promise.resolve();

    for (let i = 0; i < iterationCount; i += 1) {
      promise = promise.then(() => this._invoker.undo());
    }

    return promise;
  }
Undo
@param {number} [iterationCount=1] - Iteration count of undo
@returns {Promise}
@example
imageEditor.undo();