const
A DI token representing a unique string ID, used primarily for prefixing application attributes and CSS styles when ViewEncapsulation.Emulated is being used.
const APP_ID: InjectionToken<string>;
BY default, the value is randomly generated and assigned to the application by Angular. To provide a custom ID value, use a DI provider to configure the root Injector
that uses this token.
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Licensed under the Creative Commons Attribution License 4.0.
https://v12.angular.io/api/core/APP_ID