NestJS · Senior · Question 7 of 75

How can you discover all providers with a custom decorator at startup, e.g. to register event handlers automatically?

✓Correct answer: Use DiscoveryService with createDecorator to find decorated providers or methods and wire them up in onModuleInit
2Read the src folder with fs at runtime
3Nest can't do this

Explanation

Libraries like @nestjs/cqrs and @nestjs/schedule use the same scanning mechanism.

Further reading

NestJS: Discovery service ↗

Test yourself

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