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What is APP_INITIALIZER in Angular?

APP_INITIALIZER register listeners for the Angular bootstrap process which serves as hooks during Application initialization. This way we can use such hooks to subscribe to the application bootstrap process and perform our initialization logic.

The APP_INITIALIZER is an instance of InjectionToken. It is a built-in Injection token provided by Angular.

The Angular will execute the function provided by this token when the application loads. If the function returns the promise, then the angular will wait until the promise is resolved. This will make it an ideal place to perform some initialization logic before the application is initialized.

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What is AngularJS? What are the key features of AngularJS. What are the advantages of using AngularJS? What are the key components of AngularJS Framework? What are the limitations of using AngularJS? Explain about AngularJS Expression. Can we pass parameters to an AngularJS controller? What is bower? What is a component in Angular? What are .ts extension files? How do you communicate between different modules of your application using angularjs? How does interpolation, for example "{{ someModel }}" works? What is $rootScope and how does it relate to $scope? Advantages of components in AngularJS. What is ngBind directive in AngularJS? What is ngIf directive in Angular? Difference between ng-show/ng-hide directives and ngIf in angularjs. Explain directives in Angular. What is the role of selector property of components in AngularJS? Explain Angular architecture. Type of module in Angular 2. Explain root module in angular2. What is an Angular module? What does the npm start do? 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