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docs: clarify providedIn options (#42355) 

The list for the possible options of providedIn was not totally clear. This commit ensures each possible value is included explicitly in the docs.

fixes #29330

PR Close #42355
This commit is contained in:
Andrew Scott 2021-05-26 10:06:11 -07:00 committed by Zach Arend
parent 33e1a18530
commit 9193ea20e4
1 changed files with 9 additions and 3 deletions
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12
packages/core/src/di/injectable.ts
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@ -64,9 +64,15 @@ export interface InjectableDecorator {
*/
export interface Injectable {
/**
* Determines which injectors will provide the injectable,
* by either associating it with an `@NgModule` or other `InjectorType`,
* or by specifying that this injectable should be provided in one of the following injectors:
* Determines which injectors will provide the injectable.
*
* - `Type<any>` - associates the injectable with an `@NgModule` or other `InjectorType`,
* - 'null' : Equivalent to `undefined`. The injectable is not provided in any scope automatically
* and must be added to a `providers` array of an [@NgModule](api/core/NgModule#providers),
* [@Component](api/core/Directive#providers) or [@Directive](api/core/Directive#providers).
*
* The following options specify that this injectable should be provided in one of the following
* injectors:
* - 'root' : The application-level injector in most apps.
* - 'platform' : A special singleton platform injector shared by all
* applications on the page.