What is the APP_GUARD / APP_PIPE token pattern in NestJS?
Registering a global enhancer through the DI system using special tokens (APP_GUARD, APP_PIPE, APP_INTERCEPTOR, APP_FILTER) so the enhancer can inject services. This is the preferred approach over app.useGlobalGuards() for any enhancer that has dependencies like JwtService or Reflector.
Global guard with injected dependencies