Variable Export
export APP_IDA DI Token representing a unique string id assigned to the application by Angular and used
primarily for prefixing application attributes and CSS styles when
ViewEncapsulation is being used.
If you need to avoid randomly generated value to be used as an application id, you can provide
a custom value via a DI provider configuring the root Injector
using this token.
exported from @angular/core/index defined in @angular/core/src/application_tokens.ts