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I decided to write this article when I was browsing NestJS issues, in particular A Guard with dependencies can’t be injected into another module. Its author wonders why NestJS cannot resolve dependency for AuthGuard, because this dependency is imported into the module where the guard is declared.
This code demonstrates the centralized addition of a guard to a module, and by the way, NestJS v9 still doesn’t support this feature. In NestJS, adding a guard is supported only at the controller or method level, because the guard is not considered a provider.