Merge pull request nestjs#936 from nestjs/bugfix/935-file-interceptor

bugfix(@nestjs/common) fix multiple file interceptors issue

Author: kamilmysliwiec

packages/common/interceptors/file-fields.interceptor.ts

@@ -1,5 +1,6 @@
 import * as multer from 'multer';
 import { Observable } from 'rxjs';
+import { mixin } from '../decorators/core/component.decorator';
 import { ExecutionContext } from '../interfaces';
 import { MulterField, MulterOptions } from '../interfaces/external/multer-options.interface';
 import { NestInterceptor } from './../interfaces/features/nest-interceptor.interface';
@@ -9,7 +10,7 @@ export function FileFieldsInterceptor(
   uploadFields: MulterField[],
   options?: MulterOptions,
 ) {
-  const Interceptor = class implements NestInterceptor {
+  const Interceptor = mixin(class implements NestInterceptor {
     readonly upload = multer(options);
 
     async intercept(
@@ -33,6 +34,6 @@ export function FileFieldsInterceptor(
       );
       return call$;
     }
-  };
+  });
   return Interceptor;
 }

packages/common/interceptors/files.interceptor.ts

@@ -1,16 +1,17 @@
 import * as multer from 'multer';
-import { NestInterceptor } from './../interfaces/features/nest-interceptor.interface';
 import { Observable } from 'rxjs';
+import { mixin } from '../decorators/core/component.decorator';
+import { ExecutionContext } from '../interfaces';
 import { MulterOptions } from '../interfaces/external/multer-options.interface';
+import { NestInterceptor } from './../interfaces/features/nest-interceptor.interface';
 import { transformException } from './multer/multer.utils';
-import { ExecutionContext } from '../interfaces';
 
 export function FilesInterceptor(
   fieldName: string,
   maxCount?: number,
   options?: MulterOptions,
 ) {
-  const Interceptor = class implements NestInterceptor {
+  const Interceptor = mixin(class implements NestInterceptor {
     readonly upload = multer(options);
 
     async intercept(
@@ -34,6 +35,6 @@ export function FilesInterceptor(
       );
       return call$;
     }
-  };
+  });
   return Interceptor;
 }

sample/15-mvc/src/app.controller.ts

@@ -1,4 +1,4 @@
-import { Get, Controller, Render } from '@nestjs/common';
+import { Controller, Get, Render } from '@nestjs/common';
 
 @Controller()
 export class AppController {