Questions
9 of 24
1What is property-based injection in NestJS and when should you use it?
2What is the correct architectural solution for circular dependencies beyond forwardRef()?
3How does moduleRef.resolve() work with scoped providers and what is ContextIdFactory used for?
4What is LazyModuleLoader in NestJS and how does it differ from standard DI?
5How do you replace a provider in a NestJS test module using overrideProvider()?
6What role does reflect-metadata play in NestJS DI?
7What is a circular dependency in NestJS and how does it manifest at runtime?
8What are the three provider scopes in NestJS and when is each appropriate?
9What is a DI token and what types can be used as tokens in NestJS?
10How do you implement the Strategy pattern using NestJS DI?
11How does forwardRef() solve circular dependencies in NestJS and how does it work internally?
12When do you need @Inject(TOKEN) vs plain constructor injection in NestJS?
13What happens to REQUEST-scoped providers during WebSocket connections or microservice message handling in NestJS?
14What is the difference between moduleRef.get() and moduleRef.resolve() in NestJS?
15What is the difference between Dependency Injection (DI) and Inversion of Control (IoC)?
16What is scope propagation in NestJS and why can it impact performance?
17How do you pass a custom REQUEST object to a REQUEST-scoped provider for queues or CRON jobs in NestJS?
18How do you inject the raw HTTP request object inside a REQUEST-scoped provider in NestJS?
19How does NestJS resolve constructor injection at runtime?
20How do you detect and debug circular dependency errors in large NestJS projects?
21How do you write a unit test for a NestJS service that has injected dependencies?
22What is ModuleRef in NestJS and when would you use it?
23What does @Optional() decorator do in NestJS?
24What is Inversion of Control (IoC) and how does NestJS implement it?
