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每个 Angular 应用程序都有一个应用程序根模块类。按规约这个类的名字为 AppModule ，存放在名为 app.component.ts 的文件。 -> 每个 Angular 应用程序都有一个应用程序根模块类。按规约这个类的名字为 AppModule ，存放在名为 app.module.ts 的文件。
Why the _fragments dir is checked in
Within this repo files generated as a result of shredding the _examples dir ( the contents of the _fragments dir) are checked in so that we can avoid running the
shredder over the entire _examples dir each time someone refreshes the repo ( the shred-full gulp task).
The gulp serve-and-watch shredder is only a ‘partial’ shredder. It only shred’s files in directories changed during
the current session.