A DI token that you can use to provide one or more initialization functions.
const APP_INITIALIZER: InjectionToken<(() => void)>;
The provided functions are injected at application startup and executed during app initialization. If any of these functions returns a Promise, initialization does not complete until the Promise is resolved.
You can, for example, create a factory function that loads language data or an external configuration, and provide that function to the
APP_INITIALIZER token. The function is executed during the application bootstrap process, and the needed data is available on startup.
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