Deprecation Guide for Access to Instances in Initializers

Previously, initializers had access to an object that allowed them to both register new classes and get instances of those classes.

If you have an initializer that gets instances of a class, you need to change it to use an instance initializer.

Change code that looks like this:

App.initializer({
  name: "clock",

  initialize: function(container, application) {
    application.register("clock:main", Clock);
    var clock = container.lookup("clock:main");
    clock.setStartTime(Date.now());
  }
});

To:

App.initializer({
  name: "clock",

  initialize: function(registry, application) {
    application.register("clock:main", Clock);
  }
});

App.instanceInitializer({
  name: "clock",

  initialize: function(instance) {
    var clock = instance.container.lookup("clock:main");
    clock.setStartTime(Date.now());
  }
});

Added in PR #10256.

For more information, see the instance initializer deprecation guide.