S2E4 providedIn: root, any, platform

providedIn option determines which injectors will provide the injectable:

- 'root': The application-level injector in most apps (default option)
- 'platform': A special singleton platform injector shared by all applications on the page (in case if you have more than one).
- 'any': Provides a unique instance in each lazy-loaded module while all eagerly loaded modules share one instance.

Official docs:
https://angular.io/api/core/Injectable

Code: https://github.com/stevermeister/AngularPro-Screencast/tree/master/code/Season2-Dependency-Injection/provide-in

Angular Pro Screencasts Roadmap - https://github.com/stevermeister/AngularPro-Screencast

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