[Solved] Identify the error in this TimeoutInterceptor implementation:intercept(context, next) { return next.handle().pipe( timeout(3000), catchError(err => { throw new RequestTimeoutException(); }) ); } | NestJS

NestJS - Interceptors

Identify the error in this TimeoutInterceptor implementation:

intercept(context, next) {
  return next.handle().pipe(
    timeout(3000),
    catchError(err => {
      throw new RequestTimeoutException();
    })
  );
}

AUsing <code>throw</code> inside <code>catchError</code> instead of returning an observable error.

BTimeout value should be in seconds, not milliseconds.

CMissing import for <code>RequestTimeoutException</code>.

DThe interceptor must return a Promise, not an Observable.

Step-by-Step Solution

Solution:

Step 1: Check error handling inside catchError
Inside catchError, throwing an error directly breaks the observable chain; it should return an observable error using throwError.
Step 2: Validate other options
Timeout is correctly in milliseconds, imports are assumed correct, and interceptors return Observables, so only Using throw inside catchError instead of returning an observable error. is the error.
Final Answer:
Using throw inside catchError instead of returning an observable error. -> Option A
Quick Check:
Use throwError() inside catchError, not throw [OK]

Quick Trick: Inside catchError, always return throwError() observable [OK]

Common Mistakes:

Throwing error directly inside catchError
Confusing milliseconds with seconds
Assuming interceptors return Promises

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Identify the error in this TimeoutInterceptor implementation:

Step 1: Check error handling inside catchError

Step 2: Validate other options

Final Answer:

Quick Check:

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