[REQ][typescript-angular] Angular 9 providedIn support

Created by: UnleashSpirit

Hello, Angular 9 brings new level for @Injectable, 'any' and 'platform'

Is your feature request related to a problem? Please describe.

No

Describe the solution you'd like

Removing the 'providedInRoot' option as boolean and gives a new one. Something like 'providedIn' with all the choices :

• none
• root
• any
• platform

May be with keeping default as root ? And may be a ApiModule.forPlatform() ? (don't even know if it makes sense)

Additional context

I face that 'issue', which is not a real one for now more an improvement, during Angular Elements creation (WebComponent). In my case I have a service provided un 'platform' level which also depend on generated service from openapi v3. But a 'platform' service can't use a root level service (null injector)

In any case I think that supporting the new levels of Angular 9 Injectable would be appreciate