Method on

packages/core/src/editor/index.ts:727–730

* Attach event * @param {string} event Event name * @param {Function} callback Callback function * @return {this}

(event: E, callback: EditorEventHandler<E>)

   * @return {this}
   */
  on<E extends EditorEvent>(event: E, callback: EditorEventHandler<E>) {
    this.em.on(event as string, callback);
    return this;
  }

  /**
   * Attach event and detach it after the first run