feat!(): add custom execution context

sample/common/interceptors/response-time.interceptor.ts

@@ -0,0 +1,20 @@
+import {
+  CallHandler,
+  ExecutionContext,
+  Injectable,
+  NestInterceptor,
+} from '@nestjs/common';
+import { Observable } from 'rxjs';
+import { tap } from 'rxjs/operators';
+
+@Injectable()
+export class ResponseTimeInterceptor implements NestInterceptor {
+  intercept(context: ExecutionContext, next: CallHandler): Observable<any> {
+    console.log('Before...');
+
+    const start = Date.now();
+    return next
+      .handle()
+      .pipe(tap(() => console.log(`Response time: ${Date.now() - start}ms`)));
+  }
+}