We've simplified the functions of our lifecycle for your convenience to control when to load application or plugins. Generally speaking, the lifecycle events can be divided into two forms:

1. Function (already deprecated, just for compatibility).
2. Class Method (recommanded).

Replacer for beforeStart

We usually handle beforeStart through module.export with the input parameter app in the app.js. Take this as an example below:

module.exports = (app) => {
  app.beforeStart(async () => {
    // Here's where your codes were before
  });
};

Now we've got some changes after upgration: We can use methods in a class in app.js. For application, we should write in the WillReady, for plugins, didLoad is our choice. They look like below:

// app.js or agent.js:
class AppBootHook {
  constructor(app) {
    this.app = app;
  }

  async didLoad() {
    // Please put your codes of `app.beforeStart` here for your plugin
  }

  async willReady() {
    // Please put your codes of `app.beforeStart` here for your application
  }
}

module.exports = AppBootHook;

Replacer for ready

We used to process our logic in app.ready:

module.exports = (app) => {
  app.ready(async () => {
    // Here's where your codes were before
  });
};

Now didReady takes the place of it:

// app.js or agent.js:
class AppBootHook {
  constructor(app) {
    this.app = app;
  }

  async didReady() {
    // Please put your codes of `app.ready` here
  }
}

module.exports = AppBootHook;

Replacer for beforeClose

We used to handle app.beforeClose like this following:

module.exports = (app) => {
  app.beforeClose(async () => {
    // Here's where your codes were before
  });
};

Now we can use beforeClose instead of it:

// app.js or agent.js:
class AppBootHook {
  constructor(app) {
    this.app = app;
  }

  async beforeClose() {
    // Please put your codes of `app.beforeClose` here
  }
}

Others

In order to let you pick up quickly to replace your old functions, this torturial only tells you how to replace item by item. So if you want to know more about the whole principle of Loader, as well as all the functions of Egg's lifecycle, Please refer to Loader and Application Startup Configuration.