Method hasUndo

packages/core/src/undo_manager/index.ts:280–282

* Checks if exists an available undo * @return {Boolean} * @example * um.hasUndo();

()

   * um.hasUndo();
   */
  hasUndo() {
    return !!this.um.isAvailable('undo');
  }

  /**
   * Checks if exists an available redo