添加一个转换数据的拦截器，nest generate interceptor transform core/interceptors

src/core/interceptors/transform.interceptor.spec.ts

@@ -0,0 +1,7 @@
+import { TransformInterceptor } from './transform.interceptor';
+
+describe('TransformInterceptor', () => {
+  it('should be defined', () => {
+    expect(new TransformInterceptor()).toBeDefined();
+  });
+});

src/core/interceptors/transform.interceptor.ts

@@ -0,0 +1,9 @@
+import { CallHandler, ExecutionContext, Injectable, NestInterceptor } from '@nestjs/common';
+import { Observable } from 'rxjs';
+
+@Injectable()
+export class TransformInterceptor implements NestInterceptor {
+  intercept(context: ExecutionContext, next: CallHandler): Observable<any> {
+    return next.handle();
+  }
+}