Angular Interview Practice

What occurs during the bootstrapping phase in Angular?

1. Only the components are created

2. Angular creates the dependency injection tree and instantiates the root module

3. Only the styles are applied to the components

4. Angular compiles the services into the module

The correct answer is: Angular creates the dependency injection tree and instantiates the root module

During the bootstrapping phase in Angular, Angular creates the dependency injection tree and instantiates the root module. This phase is crucial as it sets up the entire application structure. When the bootstrapping process begins, Angular takes the root module, which serves as the entry point for the application, and sets up the injector for dependency injection. This means that Angular will resolve and provide all of the services and components defined within the module and its sub-modules. The injector tree allows for the correct instantiation of services based on the Angular dependency injection system, ensuring that components can get the dependencies they require. The creation of the dependency injection tree is essential because it allows Angular to manage the lifecycle and scope of services efficiently. After setting up the injector and instantiating the root module, Angular continues with creating and rendering the component tree and applying any styles defined in the application. Thus, the correct understanding of this phase emphasizes not only the instantiation of components but also the foundational role that dependency injection plays in bootstrapping an Angular application.