Method insertBefore

packages/shell/src/model/node.ts:533–543

* 在指定位置之前插入一个节点 * @param node * @param ref * @param useMutator

(
      node: IPublicModelNode,
      ref?: IPublicModelNode | undefined,
      useMutator?: boolean,
    )

   * @param useMutator
   */
  insertBefore(
      node: IPublicModelNode,
      ref?: IPublicModelNode | undefined,
      useMutator?: boolean,
    ): void {
    this[nodeSymbol].insertBefore(
        (node as any)[nodeSymbol] || node,
        (ref as any)?.[nodeSymbol],
        useMutator,
      );
  }

  /**
   * 在指定位置之后插入一个节点