What is the main purpose of the* providedIn: 'root'* property which is automatically put on each generated service?

Question

Besides allowing the registration of the provider, what is the main purpose of the* providedIn: 'root'* property which is automatically put on each generated service?

Accepted Answer

- Allows you to benefit from Tree Shaking

Answer

- Allow other available injectables to be injected into this service

Answer

- Allow the configuration defined in the environment.ts file to be automatically injected into its constructor

Answer

Allow to automatically generate a mocked version as part of unit tests

Question from the Angular test

What is the main purpose of the* providedIn: 'root'* property which is automatically put on each generated service?