Storing declaration files for JavaScript APIs | JavaScript API 公共仓，存放 d.ts 声明文件
系统资源组件定义了系统层级的全局资源。
Application compatibility test suite | acts应用兼容性测试套
Providing system resources such as fonts | 字体等系统资源
Window Manager | 窗口管理框架
Third-party open-source software flutter | 三方开源软件flutter
