fix(@nestjs/core) middleware not being hit for controllers without path (nestjs#71)

Author: kamil.mysliwiec

example/modules/users/auth.middleware.ts

@@ -7,7 +7,7 @@ import { NestMiddleware } from '../../../src/common/interfaces/middlewares/nest-
 export class AuthMiddleware implements NestMiddleware {
     constructor(private usersService: UsersService) {}
 
-    public resolve() {
+    public resolve(): (req, res, next) => void {
         return (req, res, next) => {
             const username = req.headers['x-access-token'];
             const users = this.usersService.getUsers();
@@ -19,6 +19,5 @@ export class AuthMiddleware implements NestMiddleware {
             next();
         };
     }
-
 }
 

src/core/middlewares/routes-mapper.ts

@@ -16,7 +16,7 @@ export class RoutesMapper {
         }
         const paths = this.routerExplorer.scanForPaths(Object.create(routeMetatype), routeMetatype.prototype);
         return paths.map((route) => ({
-            path: this.validateRoutePath(routePath) + this.validateRoutePath(route.path),
+            path: this.validateGlobalPath(routePath) + this.validateRoutePath(route.path),
             method: route.requestMethod,
         }));
     }
@@ -32,6 +32,11 @@ export class RoutesMapper {
         };
     }
 
+    private validateGlobalPath(path: string): string {
+        const prefix = validatePath(path);
+        return prefix === '/' ? '' : prefix;
+    }
+
     private validateRoutePath(path: string): string {
         return validatePath(path);
     }