# ng-japan OnAir vol.30

connpass: https://connpass.com/event/197836
shownote: https://hackmd.io/@lacolaco/B1DlxwMiP
youtube: https://www.youtube.com/watch?v=kf9sPXeuAok

## アジェンダ

- 再発見シリーズ: `@Injectable()`

## `@Injectable`を再発見！

[Angular 日本語ドキュメンテーション \- Injectable](https://angular.jp/api/core/Injectable)

### Tree-Shakable Providerのおさらい

https://blog.lacolaco.net/2018/03/angular-v6-tree-shakabke-di/

### `providedIn`

- 'root' : The application-level injector in most apps.
- 'platform' : A special singleton platform injector shared by all applications on the page.
- 'any' : Provides a unique instance in each lazy loaded module while all eagerly loaded modules share one instance.

#### "root"

#### "any"

#### "platform"

#### `InjectorType`/ Module / Component

### `ɵfac` / `ɵprov`

###### tags: `ng_jp_onair`