Method getDocumentById

packages/shell/src/api/project.ts:133–135

* 根据 id 获取 document * @param id * @returns

(id: string)

   * @returns
   */
  getDocumentById(id: string): IPublicModelDocumentModel | null {
    return ShellDocumentModel.create(this[projectSymbol].getDocument(id));
  }

  /**
   * 导出 project