[Solved] What will be the output if you forget to import CacheModule but apply CacheInterceptor globally? — Ans: The application throws a runtime error because cache manager is not available. | NestJS

NestJS - Interceptors

What will be the output if you forget to import CacheModule but apply CacheInterceptor globally?

AThe application logs a warning but caches responses anyway.

BThe CacheInterceptor silently disables caching and works normally.

CThe application throws a runtime error because cache manager is not available.

DThe CacheInterceptor caches data in memory by default without errors.

Step-by-Step Solution

Solution:

Step 1: Recognize CacheModule role
CacheModule provides the cache manager needed by CacheInterceptor to store data.
Step 2: Consequence of missing CacheModule
Without CacheModule, CacheInterceptor cannot function and causes runtime errors.
Final Answer:
The application throws a runtime error because cache manager is not available. -> Option C
Quick Check:
CacheModule missing = runtime error with CacheInterceptor [OK]

Quick Trick: Always import CacheModule before using CacheInterceptor [OK]

Common Mistakes:

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What will be the output if you forget to import CacheModule but apply CacheInterceptor globally?