Angular Interview Practice

In the execution cycle of an Angular application, which file is executed first?

1. app.module.ts

2. index.html

3. main.ts

4. app.component.ts

The correct answer is: main.ts

In an Angular application, the execution cycle begins with the loading of the index.html file. However, the first file that is executed in terms of Angular’s application logic and setup is main.ts. This file serves as the entry point for the application where the platform is bootstrapped. Within main.ts, the Angular application module is loaded and the root module is bootstrapped, which is typically the AppModule defined in app.module.ts. This module then points to the root component, which is usually the AppComponent defined in app.component.ts. While index.html is crucial for hosting the Angular application and includes the necessary script references, it is ignored in terms of Angular logic execution. Instead, it simply serves to load the scripts and initialize the application by referencing main.ts to kick off Angular’s process. This orderly bootstrapping ensures that the application is set up correctly and that all necessary modules and components are initialized properly, which emphasizes the importance of main.ts in the execution cycle.