Merge pull request #16369 from nestjs/build/esm-migration

build: migrate from cjs to esm

.circleci/config.yml

@@ -1,12 +1,6 @@
 version: 2.1
 
 parameters:
-  check-legacy-node-version:
-    type: boolean
-    default: false
-  legacy-node-version:
-    type: string
-    default: '18.20'
   maintenance-node-version:
     type: string
     default: '20.18'
@@ -15,7 +9,7 @@ parameters:
     default: '22.11'
   current-node-version:
     type: string
-    default: '23.3'
+    default: '24.1'
 
 aliases:
   - &restore-cache
@@ -62,61 +56,36 @@ jobs:
     docker:
       - image: cimg/node:<< parameters.node-version >>
     steps:
+      - checkout
+      - *restore-cache
+      - *install-deps
+      - *build-packages
       - when:
           condition:
-            and:
-              - equal:
-                  [
-                    '<< parameters.node-version >>',
-                    '<< pipeline.parameters.legacy-node-version >>',
-                  ]
-              - not: << pipeline.parameters.check-legacy-node-version >>
+            equal:
+              [
+                '<< parameters.node-version >>',
+                '<< pipeline.parameters.maintenance-node-version >>',
+              ]
           steps:
             - run:
-                name: Skip
-                command: |
-                  echo Skipping
+                name: Test (coverage)
+                command: npm run test:cov
+            - run:
+                name: Collect coverage
+                command: npm run coverage
+            - store_artifacts:
+                path: coverage
       - when:
           condition:
-            or:
-              - not:
-                  equal:
-                    [
-                      '<< parameters.node-version >>',
-                      '<< pipeline.parameters.legacy-node-version >>',
-                    ]
-              - << pipeline.parameters.check-legacy-node-version >>
+            not:
+              equal:
+                [
+                  '<< parameters.node-version >>',
+                  '<< pipeline.parameters.maintenance-node-version >>',
+                ]
           steps:
-            - checkout
-            - *restore-cache
-            - *install-deps
-            - *build-packages
-            - when:
-                condition:
-                  equal:
-                    [
-                      '<< parameters.node-version >>',
-                      '<< pipeline.parameters.maintenance-node-version >>',
-                    ]
-                steps:
-                  - run:
-                      name: Test (coverage)
-                      command: npm run test:cov
-                  - run:
-                      name: Collect coverage
-                      command: npm run coverage
-                  - store_artifacts:
-                      path: coverage
-            - when:
-                condition:
-                  not:
-                    equal:
-                      [
-                        '<< parameters.node-version >>',
-                        '<< pipeline.parameters.maintenance-node-version >>',
-                      ]
-                steps:
-                  - *run-unit-tests
+            - *run-unit-tests
 
   lint:
     working_directory: ~/nest
@@ -183,7 +152,6 @@ jobs:
           name: Build all samples
           command: npm run build:samples
 
-
 workflows:
   build-and-test:
     jobs:
@@ -195,7 +163,6 @@ workflows:
             parameters:
               node-version:
                 [
-                  '<< pipeline.parameters.legacy-node-version >>',
                   '<< pipeline.parameters.maintenance-node-version >>',
                   '<< pipeline.parameters.active-node-version >>',
                   '<< pipeline.parameters.current-node-version >>',
@@ -209,4 +176,3 @@ workflows:
       - samples:
           requires:
             - build
-

CONTRIBUTING.md

@@ -116,7 +116,6 @@ We cannot accept code without this.
 1. In GitHub, send a pull request to `nestjs:master`.
 
 - If we suggest changes then:
-
   - Make the required updates.
   - Re-run the Nest test suites to ensure tests are still passing.
   - Rebase your branch and force push to your GitHub repository (this will update your Pull Request):
@@ -159,7 +158,7 @@ from the main (upstream) repository:
 
 ## <a name="development"></a> Development Setup
 
-You will need [Node.js](https://nodejs.org) version >= 10.13.0 (except for v13).
+You will need [Node.js](https://nodejs.org) version >= 20.
 
 1. After cloning the repo, run:
 
@@ -322,8 +321,10 @@ changes to be accepted, the CLA must be signed. It's a quick process, we promise
 <!-- [coc]: https://github.com/angular/code-of-conduct/blob/master/CODE_OF_CONDUCT.md -->
 
 [commit-message-format]: https://docs.google.com/document/d/1QrDFcIiPjSLDn3EL15IJygNPiHORgU1_OOAqWjiDU5Y/edit#
+
 <!-- [individual-cla]: http://code.google.com/legal/individual-cla-v1.0.html -->
 <!-- [corporate-cla]: http://code.google.com/legal/corporate-cla-v1.0.html -->
+
 [dev-doc]: https://github.com/nestjs/nest/blob/master/docs/DEVELOPER.md
 [github]: https://github.com/nestjs/nest
 [stackoverflow]: https://stackoverflow.com/questions/tagged/nestjs

gulpfile.js

@@ -1,16 +0,0 @@
-'use strict';
-/**
- * Load the TypeScript compiler, then load the TypeScript gulpfile which simply loads all
- * the tasks. The tasks are really inside tools/gulp/tasks.
- */
-
-const path = require('path');
-
-const projectDir = __dirname;
-const tsconfigPath = path.join(projectDir, 'tools/gulp/tsconfig.json');
-
-require('ts-node').register({
-  project: tsconfigPath
-});
-
-require('./tools/gulp/gulpfile');

gulpfile.mjs

@@ -0,0 +1,13 @@
+/**
+ * Load the TypeScript compiler, then load the TypeScript gulpfile which simply loads all
+ * the tasks. The tasks are really inside tools/gulp/tasks.
+ */
+
+import { register } from 'node:module';
+import { pathToFileURL } from 'node:url';
+
+register('ts-node/esm', pathToFileURL('./'), {
+  data: { project: './tools/gulp/tsconfig.json' },
+});
+
+await import('./tools/gulp/gulpfile.ts');

hooks/mocha-init-hook.ts

@@ -1,7 +0,0 @@
-export const mochaHooks = (): Mocha.RootHookObject => {
-  return {
-    async beforeAll(this: Mocha.Context) {
-      await import('reflect-metadata');
-    },
-  };
-};

integration/auto-mock/src/bar.service.ts

@@ -1,5 +1,5 @@
 import { Injectable } from '@nestjs/common';
-import { FooService } from './foo.service';
+import { FooService } from './foo.service.js';
 
 @Injectable()
 export class BarService {

integration/auto-mock/test/bar.service.spec.ts

@@ -1,17 +1,11 @@
 import { Test } from '@nestjs/testing';
-import * as chai from 'chai';
-import * as chaiAsPromised from 'chai-as-promised';
-import * as sinon from 'sinon';
-import { BarService } from '../src/bar.service';
-import { FooService } from '../src/foo.service';
-
-chai.use(chaiAsPromised);
-const { expect } = chai;
+import { BarService } from '../src/bar.service.js';
+import { FooService } from '../src/foo.service.js';
 
 describe('Auto-Mocking Bar Deps', () => {
   let service: BarService;
   let fooService: FooService;
-  const stub = sinon.stub();
+  const stub = vi.fn();
   beforeEach(async () => {
     const moduleRef = await Test.createTestingModule({
       providers: [BarService],
@@ -23,12 +17,12 @@ describe('Auto-Mocking Bar Deps', () => {
   });
 
   it('should be defined', () => {
-    expect(service).not.to.be.undefined;
-    expect(fooService).not.to.be.undefined;
+    expect(service).not.toBeUndefined();
+    expect(fooService).not.toBeUndefined();
   });
   it('should call bar.bar', () => {
     service.bar();
-    expect(stub.called);
+    expect(stub).toHaveBeenCalled();
   });
 });
 
@@ -39,23 +33,25 @@ describe('Auto-Mocking with token in factory', () => {
     })
       .useMocker(token => {
         if (token === FooService) {
-          return { foo: sinon.stub };
+          return { foo: vi.fn() };
         }
       })
       .compile();
     const service = moduleRef.get(BarService);
-    const fooServ = moduleRef.get<{ foo: sinon.SinonStub }>(FooService as any);
+    const fooServ = moduleRef.get<{ foo: ReturnType<typeof vi.fn> }>(
+      FooService as any,
+    );
     service.bar();
-    expect(fooServ.foo.called);
+    expect(fooServ.foo).toHaveBeenCalled();
   });
   it('cannot mock the dependencies', async () => {
     const moduleRef = Test.createTestingModule({
       providers: [BarService],
     }).useMocker(token => {
       if (token === FooService.name + 'something that fails the token') {
-        return { foo: sinon.stub };
+        return { foo: vi.fn() };
       }
     }).compile;
-    expect(moduleRef()).to.eventually.throw();
+    await expect(moduleRef()).rejects.toThrow();
   });
 });

integration/auto-mock/tsconfig.json

@@ -1,13 +1,15 @@
 {
   "compilerOptions": {
+    "types": ["vitest/globals"],
     "module": "commonjs",
     "declaration": false,
     "noImplicitAny": false,
     "removeComments": true,
     "noLib": false,
+    "esModuleInterop": true,
     "emitDecoratorMetadata": true,
     "experimentalDecorators": true,
-    "target": "ES2021",
+    "target": "ES2023",
     "sourceMap": true,
     "allowJs": true,
     "strictNullChecks": true,

integration/cors/e2e/express.spec.ts

@@ -1,7 +1,7 @@
 import { NestExpressApplication } from '@nestjs/platform-express';
 import { Test } from '@nestjs/testing';
-import * as request from 'supertest';
-import { AppModule } from '../src/app.module';
+import request from 'supertest';
+import { AppModule } from '../src/app.module.js';
 
 describe('Express Cors', () => {
   let app: NestExpressApplication;
@@ -25,7 +25,7 @@ describe('Express Cors', () => {
   ];
   describe('Dynamic config', () => {
     describe('enableCors', () => {
-      before(async () => {
+      beforeAll(async () => {
         const module = await Test.createTestingModule({
           imports: [AppModule],
         }).compile();
@@ -66,13 +66,13 @@ describe('Express Cors', () => {
           .expect('content-length', '0');
       });
 
-      after(async () => {
+      afterAll(async () => {
         await app.close();
       });
     });
 
     describe('Application Options', () => {
-      before(async () => {
+      beforeAll(async () => {
         const module = await Test.createTestingModule({
           imports: [AppModule],
         }).compile();
@@ -114,14 +114,14 @@ describe('Express Cors', () => {
           .expect('content-length', '0');
       });
 
-      after(async () => {
+      afterAll(async () => {
         await app.close();
       });
     });
   });
   describe('Static config', () => {
     describe('enableCors', () => {
-      before(async () => {
+      beforeAll(async () => {
         const module = await Test.createTestingModule({
           imports: [AppModule],
         }).compile();
@@ -141,14 +141,14 @@ describe('Express Cors', () => {
           .expect('access-control-expose-headers', 'foo,bar')
           .expect('content-length', '0');
       });
-    });
 
-    after(async () => {
-      await app.close();
+      afterAll(async () => {
+        await app.close();
+      });
     });
 
     describe('Application Options', () => {
-      before(async () => {
+      beforeAll(async () => {
         const module = await Test.createTestingModule({
           imports: [AppModule],
         }).compile();
@@ -169,7 +169,7 @@ describe('Express Cors', () => {
           .expect('content-length', '0');
       });
 
-      after(async () => {
+      afterAll(async () => {
         await app.close();
       });
     });

integration/cors/e2e/fastify.spec.ts

@@ -3,8 +3,8 @@ import {
   NestFastifyApplication,
 } from '@nestjs/platform-fastify';
 import { Test } from '@nestjs/testing';
-import * as request from 'supertest';
-import { AppModule } from '../src/app.module';
+import request from 'supertest';
+import { AppModule } from '../src/app.module.js';
 
 describe.skip('Fastify Cors', () => {
   let app: NestFastifyApplication;
@@ -28,7 +28,7 @@ describe.skip('Fastify Cors', () => {
   ];
   describe('Dynamic config', () => {
     describe('enableCors', () => {
-      before(async () => {
+      beforeAll(async () => {
         const module = await Test.createTestingModule({
           imports: [AppModule],
         }).compile();
@@ -73,13 +73,13 @@ describe.skip('Fastify Cors', () => {
           .expect('content-length', '0');
       });
 
-      after(async () => {
+      afterAll(async () => {
         await app.close();
       });
     });
 
     describe('Application Options', () => {
-      before(async () => {
+      beforeAll(async () => {
         const module = await Test.createTestingModule({
           imports: [AppModule],
         }).compile();
@@ -124,7 +124,7 @@ describe.skip('Fastify Cors', () => {
           .expect('content-length', '0');
       });
 
-      after(async () => {
+      afterAll(async () => {
         await app.close();
       });
     });
@@ -132,7 +132,7 @@ describe.skip('Fastify Cors', () => {
 
   describe('Static config', () => {
     describe('enableCors', () => {
-      before(async () => {
+      beforeAll(async () => {
         const module = await Test.createTestingModule({
           imports: [AppModule],
         }).compile();
@@ -154,14 +154,14 @@ describe.skip('Fastify Cors', () => {
           .expect('access-control-expose-headers', 'foo,bar')
           .expect('content-length', '0');
       });
-    });
 
-    after(async () => {
-      await app.close();
+      afterAll(async () => {
+        await app.close();
+      });
     });
 
     describe('Application Options', () => {
-      before(async () => {
+      beforeAll(async () => {
         const module = await Test.createTestingModule({
           imports: [AppModule],
         }).compile();
@@ -184,10 +184,10 @@ describe.skip('Fastify Cors', () => {
           .expect('access-control-expose-headers', 'foo,bar')
           .expect('content-length', '0');
       });
-    });
 
-    after(async () => {
-      await app.close();
+      afterAll(async () => {
+        await app.close();
+      });
     });
   });
 });

integration/cors/src/app.module.ts

@@ -1,5 +1,5 @@
 import { Module } from '@nestjs/common';
-import { AppController } from './app.controller';
+import { AppController } from './app.controller.js';
 
 @Module({
   controllers: [AppController],

integration/cors/tsconfig.json

@@ -1,13 +1,15 @@
 {
   "compilerOptions": {
+    "types": ["vitest/globals"],
     "module": "commonjs",
     "declaration": false,
     "noImplicitAny": false,
     "removeComments": true,
     "noLib": false,
+    "esModuleInterop": true,
     "emitDecoratorMetadata": true,
     "experimentalDecorators": true,
-    "target": "ES2021",
+    "target": "ES2023",
     "sourceMap": true,
     "allowJs": true,
     "strictNullChecks": true,

integration/discovery/e2e/discover-by-meta.spec.ts

@@ -1,9 +1,8 @@
-import { Test, TestingModule } from '@nestjs/testing';
 import { DiscoveryService } from '@nestjs/core';
-import { expect } from 'chai';
-import { AppModule } from '../src/app.module';
-import { WebhooksExplorer } from '../src/webhooks.explorer';
-import { NonAppliedDecorator } from '../src/decorators/non-applied.decorator';
+import { Test, TestingModule } from '@nestjs/testing';
+import { AppModule } from '../src/app.module.js';
+import { NonAppliedDecorator } from '../src/decorators/non-applied.decorator.js';
+import { WebhooksExplorer } from '../src/webhooks.explorer.js';
 
 describe('DiscoveryModule', () => {
   let moduleRef: TestingModule;
@@ -14,10 +13,14 @@ describe('DiscoveryModule', () => {
     }).compile();
   });
 
+  afterEach(async () => {
+    await moduleRef.close();
+  });
+
   it('should discover all providers & handlers with corresponding annotations', async () => {
     const webhooksExplorer = moduleRef.get(WebhooksExplorer);
 
-    expect(webhooksExplorer.getWebhooks()).to.be.eql([
+    expect(webhooksExplorer.getWebhooks()).toEqual([
       {
         handlers: [
           {
@@ -45,7 +48,7 @@ describe('DiscoveryModule', () => {
     const providers = discoveryService.getProviders({
       metadataKey: NonAppliedDecorator.KEY,
     });
-    expect(providers).to.be.eql([]);
+    expect(providers).toEqual([]);
   });
 
   it('should return an empty array if no controllers were found for a given discoverable decorator', () => {
@@ -54,6 +57,6 @@ describe('DiscoveryModule', () => {
     const controllers = discoveryService.getControllers({
       metadataKey: NonAppliedDecorator.KEY,
     });
-    expect(controllers).to.be.eql([]);
+    expect(controllers).toEqual([]);
   });
 });

integration/discovery/src/app.module.ts

@@ -1,7 +1,7 @@
 import { Module } from '@nestjs/common';
 import { DiscoveryModule } from '@nestjs/core';
-import { MyWebhookModule } from './my-webhook/my-webhook.module';
-import { WebhooksExplorer } from './webhooks.explorer';
+import { MyWebhookModule } from './my-webhook/my-webhook.module.js';
+import { WebhooksExplorer } from './webhooks.explorer.js';
 
 @Module({
   imports: [MyWebhookModule, DiscoveryModule],

integration/discovery/src/my-webhook/cleanup.webhook.ts

@@ -1,4 +1,4 @@
-import { Webhook, WebhookHandler } from '../decorators/webhook.decorators';
+import { Webhook, WebhookHandler } from '../decorators/webhook.decorators.js';
 
 @Webhook({ name: 'cleanup' })
 export class CleanupWebhook {

integration/discovery/src/my-webhook/flush.webhook.ts

@@ -1,4 +1,4 @@
-import { Webhook, WebhookHandler } from '../decorators/webhook.decorators';
+import { Webhook, WebhookHandler } from '../decorators/webhook.decorators.js';
 
 @Webhook({ name: 'flush' })
 export class FlushWebhook {

integration/discovery/src/my-webhook/my-webhook.module.ts

@@ -1,6 +1,6 @@
 import { Module } from '@nestjs/common';
-import { CleanupWebhook } from './cleanup.webhook';
-import { FlushWebhook } from './flush.webhook';
+import { CleanupWebhook } from './cleanup.webhook.js';
+import { FlushWebhook } from './flush.webhook.js';
 
 @Module({ providers: [CleanupWebhook, FlushWebhook] })
 export class MyWebhookModule {}

integration/discovery/src/webhooks.explorer.ts

@@ -1,6 +1,6 @@
 import { Injectable } from '@nestjs/common';
 import { DiscoveryService, MetadataScanner } from '@nestjs/core';
-import { Webhook, WebhookHandler } from './decorators/webhook.decorators';
+import { Webhook, WebhookHandler } from './decorators/webhook.decorators.js';
 
 @Injectable()
 export class WebhooksExplorer {

integration/discovery/tsconfig.json

@@ -1,13 +1,15 @@
 {
   "compilerOptions": {
+    "types": ["vitest/globals"],
     "module": "commonjs",
     "declaration": false,
     "noImplicitAny": false,
     "removeComments": true,
     "noLib": false,
+    "esModuleInterop": true,
     "emitDecoratorMetadata": true,
     "experimentalDecorators": true,
-    "target": "ES2021",
+    "target": "ES2023",
     "sourceMap": true,
     "allowJs": true,
     "strictNullChecks": true,

integration/graphql-code-first/e2e/code-first.spec.ts

@@ -1,7 +1,7 @@
 import { INestApplication } from '@nestjs/common';
 import { Test } from '@nestjs/testing';
-import * as request from 'supertest';
-import { AppModule } from '../src/app.module';
+import request from 'supertest';
+import { AppModule } from '../src/app.module.js';
 
 describe('GraphQL - Code-first', () => {
   let app: INestApplication;

integration/graphql-code-first/e2e/guards-filters.spec.ts

@@ -1,7 +1,7 @@
 import { INestApplication } from '@nestjs/common';
 import { Test } from '@nestjs/testing';
-import * as request from 'supertest';
-import { AppModule } from '../src/app.module';
+import request from 'supertest';
+import { AppModule } from '../src/app.module.js';
 
 describe('GraphQL - Guards', () => {
   let app: INestApplication;

integration/graphql-code-first/e2e/pipes.spec.ts

@@ -1,7 +1,7 @@
 import { INestApplication, ValidationPipe } from '@nestjs/common';
 import { Test } from '@nestjs/testing';
-import * as request from 'supertest';
-import { AppModule } from '../src/app.module';
+import request from 'supertest';
+import { AppModule } from '../src/app.module.js';
 
 describe('GraphQL Pipes', () => {
   let app: INestApplication;

integration/graphql-code-first/src/app.module.ts

@@ -2,7 +2,7 @@ import { ApolloDriver, ApolloDriverConfig } from '@nestjs/apollo';
 import { Module } from '@nestjs/common';
 import { GraphQLModule } from '@nestjs/graphql';
 import { join } from 'path';
-import { RecipesModule } from './recipes/recipes.module';
+import { RecipesModule } from './recipes/recipes.module.js';
 
 @Module({
   imports: [

integration/graphql-code-first/src/main.ts

@@ -1,6 +1,6 @@
 import { ValidationPipe } from '@nestjs/common';
 import { NestFactory } from '@nestjs/core';
-import { AppModule } from './app.module';
+import { AppModule } from './app.module.js';
 
 async function bootstrap() {
   const app = await NestFactory.create(AppModule);

integration/graphql-code-first/src/recipes/recipes.module.ts

@@ -1,9 +1,9 @@
 import { Module } from '@nestjs/common';
 import { APP_FILTER } from '@nestjs/core';
-import { UnauthorizedFilter } from '../common/filters/unauthorized.filter';
-import { DateScalar } from '../common/scalars/date.scalar';
-import { RecipesResolver } from './recipes.resolver';
-import { RecipesService } from './recipes.service';
+import { UnauthorizedFilter } from '../common/filters/unauthorized.filter.js';
+import { DateScalar } from '../common/scalars/date.scalar.js';
+import { RecipesResolver } from './recipes.resolver.js';
+import { RecipesService } from './recipes.service.js';
 
 @Module({
   providers: [

integration/graphql-code-first/src/recipes/recipes.resolver.ts

@@ -1,12 +1,12 @@
 import { NotFoundException, UseGuards, UseInterceptors } from '@nestjs/common';
 import { Args, Mutation, Query, Resolver, Subscription } from '@nestjs/graphql';
 import { PubSub } from 'graphql-subscriptions';
-import { AuthGuard } from '../common/guards/auth.guard';
-import { DataInterceptor } from '../common/interceptors/data.interceptor';
-import { NewRecipeInput } from './dto/new-recipe.input';
-import { RecipesArgs } from './dto/recipes.args';
-import { Recipe } from './models/recipe';
-import { RecipesService } from './recipes.service';
+import { AuthGuard } from '../common/guards/auth.guard.js';
+import { DataInterceptor } from '../common/interceptors/data.interceptor.js';
+import { NewRecipeInput } from './dto/new-recipe.input.js';
+import { RecipesArgs } from './dto/recipes.args.js';
+import { Recipe } from './models/recipe.js';
+import { RecipesService } from './recipes.service.js';
 
 const pubSub = new PubSub();
 

integration/graphql-code-first/src/recipes/recipes.service.ts

@@ -1,7 +1,7 @@
 import { Injectable } from '@nestjs/common';
-import { NewRecipeInput } from './dto/new-recipe.input';
-import { RecipesArgs } from './dto/recipes.args';
-import { Recipe } from './models/recipe';
+import { NewRecipeInput } from './dto/new-recipe.input.js';
+import { RecipesArgs } from './dto/recipes.args.js';
+import { Recipe } from './models/recipe.js';
 
 @Injectable()
 export class RecipesService {

integration/graphql-code-first/tsconfig.json

@@ -1,13 +1,15 @@
 {
   "compilerOptions": {
+    "types": ["vitest/globals"],
     "module": "commonjs",
     "declaration": false,
     "noImplicitAny": false,
     "removeComments": true,
     "noLib": false,
+    "esModuleInterop": true,
     "emitDecoratorMetadata": true,
     "experimentalDecorators": true,
-    "target": "ES2021",
+    "target": "ES2023",
     "sourceMap": true,
     "allowJs": true,
     "strictNullChecks": true,

integration/graphql-schema-first/e2e/graphql-async-class.spec.ts

@@ -1,7 +1,7 @@
 import { INestApplication } from '@nestjs/common';
 import { NestFactory } from '@nestjs/core';
-import * as request from 'supertest';
-import { AsyncClassApplicationModule } from '../src/async-options-class.module';
+import request from 'supertest';
+import { AsyncClassApplicationModule } from '../src/async-options-class.module.js';
 
 describe('GraphQL (async class)', () => {
   let app: INestApplication;

integration/graphql-schema-first/e2e/graphql-async-existing.spec.ts

@@ -1,7 +1,7 @@
 import { INestApplication } from '@nestjs/common';
 import { NestFactory } from '@nestjs/core';
-import * as request from 'supertest';
-import { AsyncExistingApplicationModule } from '../src/async-options-existing.module';
+import request from 'supertest';
+import { AsyncExistingApplicationModule } from '../src/async-options-existing.module.js';
 
 describe('GraphQL (async existing)', () => {
   let app: INestApplication;

integration/graphql-schema-first/e2e/graphql-async.spec.ts

@@ -1,7 +1,7 @@
 import { INestApplication } from '@nestjs/common';
 import { NestFactory } from '@nestjs/core';
-import * as request from 'supertest';
-import { AsyncApplicationModule } from '../src/async-options.module';
+import request from 'supertest';
+import { AsyncApplicationModule } from '../src/async-options.module.js';
 
 describe('GraphQL (async configuration)', () => {
   let app: INestApplication;

integration/graphql-schema-first/e2e/graphql-request-scoped.spec.ts

@@ -2,11 +2,10 @@ import { ApolloDriver } from '@nestjs/apollo';
 import { INestApplication } from '@nestjs/common';
 import { GraphQLModule } from '@nestjs/graphql';
 import { Test } from '@nestjs/testing';
-import { expect } from 'chai';
 import { join } from 'path';
-import * as request from 'supertest';
-import { CatsRequestScopedService } from '../src/cats/cats-request-scoped.service';
-import { CatsModule } from '../src/cats/cats.module';
+import request from 'supertest';
+import { CatsRequestScopedService } from '../src/cats/cats-request-scoped.service.js';
+import { CatsModule } from '../src/cats/cats.module.js';
 
 describe('GraphQL request scoped', () => {
   let app: INestApplication;
@@ -17,7 +16,9 @@ describe('GraphQL request scoped', () => {
         CatsModule.enableRequestScope(),
         GraphQLModule.forRoot({
           driver: ApolloDriver,
-          typePaths: [join(__dirname, '..', 'src', '**', '*.graphql')],
+          typePaths: [
+            join(import.meta.dirname, '..', 'src', '**', '*.graphql'),
+          ],
         }),
       ],
     }).compile();
@@ -53,7 +54,7 @@ describe('GraphQL request scoped', () => {
   });
 
   it(`should create resolver for each incoming request`, () => {
-    expect(CatsRequestScopedService.COUNTER).to.be.eql(3);
+    expect(CatsRequestScopedService.COUNTER).toEqual(3);
   });
 
   afterEach(async () => {

integration/graphql-schema-first/e2e/graphql.spec.ts

@@ -1,7 +1,7 @@
 import { INestApplication } from '@nestjs/common';
 import { Test } from '@nestjs/testing';
-import * as request from 'supertest';
-import { AppModule } from '../src/app.module';
+import request from 'supertest';
+import { AppModule } from '../src/app.module.js';
 
 describe('GraphQL', () => {
   let app: INestApplication;

integration/graphql-schema-first/src/app.module.ts

@@ -2,7 +2,7 @@ import { ApolloDriver, ApolloDriverConfig } from '@nestjs/apollo';
 import { Module } from '@nestjs/common';
 import { GraphQLModule } from '@nestjs/graphql';
 import { join } from 'path';
-import { CatsModule } from './cats/cats.module';
+import { CatsModule } from './cats/cats.module.js';
 
 @Module({
   imports: [
@@ -10,7 +10,7 @@ import { CatsModule } from './cats/cats.module';
     GraphQLModule.forRoot<ApolloDriverConfig>({
       driver: ApolloDriver,
       includeStacktraceInErrorResponses: true,
-      typePaths: [join(__dirname, '**', '*.graphql')],
+      typePaths: [join(import.meta.dirname, '**', '*.graphql')],
     }),
   ],
 })

integration/graphql-schema-first/src/async-options-class.module.ts

@@ -2,12 +2,12 @@ import { ApolloDriver, ApolloDriverConfig } from '@nestjs/apollo';
 import { Module } from '@nestjs/common';
 import { GqlOptionsFactory, GraphQLModule } from '@nestjs/graphql';
 import { join } from 'path';
-import { CatsModule } from './cats/cats.module';
+import { CatsModule } from './cats/cats.module.js';
 
 class ConfigService implements GqlOptionsFactory {
   createGqlOptions(): ApolloDriverConfig {
     return {
-      typePaths: [join(__dirname, '**', '*.graphql')],
+      typePaths: [join(import.meta.dirname, '**', '*.graphql')],
     };
   }
 }

integration/graphql-schema-first/src/async-options-existing.module.ts

@@ -1,9 +1,9 @@
 import { ApolloDriver, ApolloDriverConfig } from '@nestjs/apollo';
 import { Module } from '@nestjs/common';
 import { GraphQLModule } from '@nestjs/graphql';
-import { CatsModule } from './cats/cats.module';
-import { ConfigModule } from './config.module';
-import { ConfigService } from './config.service';
+import { CatsModule } from './cats/cats.module.js';
+import { ConfigModule } from './config.module.js';
+import { ConfigService } from './config.service.js';
 
 @Module({
   imports: [

integration/graphql-schema-first/src/async-options.module.ts

@@ -2,7 +2,7 @@ import { ApolloDriver, ApolloDriverConfig } from '@nestjs/apollo';
 import { Module } from '@nestjs/common';
 import { GraphQLModule } from '@nestjs/graphql';
 import { join } from 'path';
-import { CatsModule } from './cats/cats.module';
+import { CatsModule } from './cats/cats.module.js';
 
 @Module({
   imports: [
@@ -10,7 +10,7 @@ import { CatsModule } from './cats/cats.module';
     GraphQLModule.forRootAsync<ApolloDriverConfig>({
       driver: ApolloDriver,
       useFactory: async () => ({
-        typePaths: [join(__dirname, '**', '*.graphql')],
+        typePaths: [join(import.meta.dirname, '**', '*.graphql')],
       }),
     }),
   ],

integration/graphql-schema-first/src/cats/cats-request-scoped.service.ts

@@ -1,5 +1,5 @@
 import { Injectable, Scope } from '@nestjs/common';
-import { Cat } from './interfaces/cat.interface';
+import { Cat } from './interfaces/cat.interface.js';
 
 @Injectable({ scope: Scope.REQUEST })
 export class CatsRequestScopedService {

integration/graphql-schema-first/src/cats/cats.module.ts

@@ -1,7 +1,7 @@
 import { DynamicModule, Module, Scope } from '@nestjs/common';
-import { CatsRequestScopedService } from './cats-request-scoped.service';
-import { CatsResolvers } from './cats.resolvers';
-import { CatsService } from './cats.service';
+import { CatsRequestScopedService } from './cats-request-scoped.service.js';
+import { CatsResolvers } from './cats.resolvers.js';
+import { CatsService } from './cats.service.js';
 
 @Module({
   providers: [CatsService, CatsResolvers],

integration/graphql-schema-first/src/cats/cats.resolvers.ts

@@ -1,9 +1,9 @@
 import { ParseIntPipe, UseGuards } from '@nestjs/common';
 import { Args, Mutation, Query, Resolver, Subscription } from '@nestjs/graphql';
 import { PubSub } from 'graphql-subscriptions';
-import { CatsGuard } from './cats.guard';
-import { CatsService } from './cats.service';
-import { Cat } from './interfaces/cat.interface';
+import { CatsGuard } from './cats.guard.js';
+import { CatsService } from './cats.service.js';
+import { Cat } from './interfaces/cat.interface.js';
 
 const pubSub = new PubSub();
 

integration/graphql-schema-first/src/cats/cats.service.ts

@@ -1,5 +1,5 @@
 import { Injectable } from '@nestjs/common';
-import { Cat } from './interfaces/cat.interface';
+import { Cat } from './interfaces/cat.interface.js';
 
 @Injectable()
 export class CatsService {

integration/graphql-schema-first/src/config.module.ts

@@ -1,5 +1,5 @@
 import { Module } from '@nestjs/common';
-import { ConfigService } from './config.service';
+import { ConfigService } from './config.service.js';
 
 @Module({
   providers: [ConfigService],

integration/graphql-schema-first/src/config.service.ts

@@ -6,7 +6,7 @@ import { join } from 'path';
 export class ConfigService implements GqlOptionsFactory {
   createGqlOptions(): GqlModuleOptions {
     return {
-      typePaths: [join(__dirname, '**', '*.graphql')],
+      typePaths: [join(import.meta.dirname, '**', '*.graphql')],
     };
   }
 }

integration/graphql-schema-first/src/main.ts

@@ -1,5 +1,5 @@
 import { NestFactory } from '@nestjs/core';
-import { AppModule } from './app.module';
+import { AppModule } from './app.module.js';
 
 async function bootstrap() {
   const app = await NestFactory.create(AppModule);

integration/graphql-schema-first/tsconfig.json

@@ -1,13 +1,15 @@
 {
   "compilerOptions": {
+    "types": ["vitest/globals"],
     "module": "commonjs",
     "declaration": false,
     "noImplicitAny": false,
     "removeComments": true,
     "noLib": false,
+    "esModuleInterop": true,
     "emitDecoratorMetadata": true,
     "experimentalDecorators": true,
-    "target": "ES2021",
+    "target": "ES2023",
     "sourceMap": true,
     "allowJs": true,
     "strictNullChecks": true,

integration/hello-world/e2e/exceptions.spec.ts

@@ -4,10 +4,9 @@ import {
   NestFastifyApplication,
 } from '@nestjs/platform-fastify';
 import { Test } from '@nestjs/testing';
-import { expect } from 'chai';
 import { RawServerDefault } from 'fastify';
-import * as request from 'supertest';
-import { ErrorsController } from '../src/errors/errors.controller';
+import request from 'supertest';
+import { ErrorsController } from '../src/errors/errors.controller.js';
 
 describe('Error messages', () => {
   let server: RawServerDefault;
@@ -82,14 +81,12 @@ describe('Error messages', () => {
           url: '/sync',
         })
         .then(({ payload, statusCode }) => {
-          expect(statusCode).to.equal(HttpStatus.BAD_REQUEST);
-          expect(payload).to.equal(
-            JSON.stringify({
-              statusCode: 400,
-              error: 'Bad Request',
-              message: 'Integration test',
-            }),
-          );
+          expect(statusCode).toBe(HttpStatus.BAD_REQUEST);
+          expect(JSON.parse(payload)).toEqual({
+            statusCode: 400,
+            error: 'Bad Request',
+            message: 'Integration test',
+          });
         });
     });
 
@@ -97,17 +94,15 @@ describe('Error messages', () => {
       return app
         .inject({
           method: 'GET',
-          url: '/sync',
+          url: '/async',
         })
         .then(({ payload, statusCode }) => {
-          expect(statusCode).to.equal(HttpStatus.BAD_REQUEST);
-          expect(payload).to.equal(
-            JSON.stringify({
-              statusCode: 400,
-              error: 'Bad Request',
-              message: 'Integration test',
-            }),
-          );
+          expect(statusCode).toBe(HttpStatus.BAD_REQUEST);
+          expect(JSON.parse(payload)).toEqual({
+            statusCode: 400,
+            error: 'Bad Request',
+            message: 'Integration test',
+          });
         });
     });
 
@@ -118,13 +113,11 @@ describe('Error messages', () => {
           url: '/unexpected-error',
         })
         .then(({ payload, statusCode }) => {
-          expect(statusCode).to.equal(HttpStatus.INTERNAL_SERVER_ERROR);
-          expect(payload).to.equal(
-            JSON.stringify({
-              statusCode: 500,
-              message: 'Internal server error',
-            }),
-          );
+          expect(statusCode).toBe(HttpStatus.INTERNAL_SERVER_ERROR);
+          expect(JSON.parse(payload)).toEqual({
+            statusCode: 500,
+            message: 'Internal server error',
+          });
         });
     });
 

integration/hello-world/e2e/exclude-middleware-fastify.spec.ts

@@ -12,8 +12,8 @@ import {
   NestFastifyApplication,
 } from '@nestjs/platform-fastify';
 import { Test } from '@nestjs/testing';
-import * as request from 'supertest';
-import { AppModule } from '../src/app.module';
+import request from 'supertest';
+import { AppModule } from '../src/app.module.js';
 
 const RETURN_VALUE = 'test';
 const MIDDLEWARE_VALUE = 'middleware';

integration/hello-world/e2e/exclude-middleware.spec.ts

@@ -8,8 +8,8 @@ import {
   RequestMethod,
 } from '@nestjs/common';
 import { Test } from '@nestjs/testing';
-import * as request from 'supertest';
-import { AppModule } from '../src/app.module';
+import request from 'supertest';
+import { AppModule } from '../src/app.module.js';
 
 const RETURN_VALUE = 'test';
 const MIDDLEWARE_VALUE = 'middleware';

integration/hello-world/e2e/express-instance.spec.ts

@@ -1,10 +1,10 @@
 import { INestApplication } from '@nestjs/common';
 import { ExpressAdapter } from '@nestjs/platform-express';
 import { Test } from '@nestjs/testing';
-import * as express from 'express';
-import * as request from 'supertest';
+import express from 'express';
+import request from 'supertest';
 import { App } from 'supertest/types';
-import { AppModule } from '../src/app.module';
+import { AppModule } from '../src/app.module.js';
 
 describe('Hello world (express instance)', () => {
   let server: App;

integration/hello-world/e2e/express-multiple.spec.ts

@@ -1,9 +1,9 @@
 import { INestApplication } from '@nestjs/common';
 import { ExpressAdapter } from '@nestjs/platform-express';
 import { Test } from '@nestjs/testing';
-import * as express from 'express';
-import * as request from 'supertest';
-import { AppModule } from '../src/app.module';
+import express from 'express';
+import request from 'supertest';
+import { AppModule } from '../src/app.module.js';
 
 describe('Hello world (express instance with multiple applications)', () => {
   let server;

integration/hello-world/e2e/fastify-adapter.spec.ts

@@ -3,8 +3,7 @@ import {
   NestFastifyApplication,
 } from '@nestjs/platform-fastify';
 import { Test } from '@nestjs/testing';
-import { expect } from 'chai';
-import { AppModule } from '../src/app.module';
+import { AppModule } from '../src/app.module.js';
 
 describe('Hello world (fastify adapter)', () => {
   let app: NestFastifyApplication;
@@ -26,7 +25,10 @@ describe('Hello world (fastify adapter)', () => {
         method: 'GET',
         url: '/hello',
       })
-      .then(({ payload }) => expect(payload).to.be.eql('Hello world!'));
+      .then(({ payload, statusCode }) => {
+        expect(statusCode).toBe(200);
+        expect(payload).toEqual('Hello world!');
+      });
   });
 
   it(`/GET (Promise/async)`, () => {
@@ -35,7 +37,10 @@ describe('Hello world (fastify adapter)', () => {
         method: 'GET',
         url: '/hello/async',
       })
-      .then(({ payload }) => expect(payload).to.be.eql('Hello world!'));
+      .then(({ payload, statusCode }) => {
+        expect(statusCode).toBe(200);
+        expect(payload).toEqual('Hello world!');
+      });
   });
 
   it(`/GET (Observable stream)`, () => {
@@ -44,7 +49,10 @@ describe('Hello world (fastify adapter)', () => {
         method: 'GET',
         url: '/hello/stream',
       })
-      .then(({ payload }) => expect(payload).to.be.eql('Hello world!'));
+      .then(({ payload, statusCode }) => {
+        expect(statusCode).toBe(200);
+        expect(payload).toEqual('Hello world!');
+      });
   });
 
   it(`/GET { host: ":tenant.example.com" } not matched`, () => {
@@ -54,7 +62,7 @@ describe('Hello world (fastify adapter)', () => {
         url: '/host',
       })
       .then(({ payload }) => {
-        expect(JSON.parse(payload)).to.be.eql({
+        expect(JSON.parse(payload)).toEqual({
           error: 'Internal Server Error',
           message:
             'HTTP adapter does not support filtering on host: ":tenant.example.com"',
@@ -70,7 +78,7 @@ describe('Hello world (fastify adapter)', () => {
         url: '/host-array',
       })
       .then(({ payload }) => {
-        expect(JSON.parse(payload)).to.be.eql({
+        expect(JSON.parse(payload)).toEqual({
           error: 'Internal Server Error',
           message:
             'HTTP adapter does not support filtering on hosts: [":tenant.example1.com", ":tenant.example2.com"]',
@@ -84,7 +92,10 @@ describe('Hello world (fastify adapter)', () => {
       .inject()
       .get('/hello')
       .end()
-      .then(({ payload }) => expect(payload).to.be.eql('Hello world!'));
+      .then(({ payload, statusCode }) => {
+        expect(statusCode).toBe(200);
+        expect(payload).toEqual('Hello world!');
+      });
   });
 
   it('/HEAD should respond to with a 200', () => {
@@ -93,7 +104,7 @@ describe('Hello world (fastify adapter)', () => {
         method: 'HEAD',
         url: '/hello',
       })
-      .then(({ statusCode }) => expect(statusCode).to.be.eq(200));
+      .then(({ statusCode }) => expect(statusCode).toBe(200));
   });
 
   afterEach(async () => {

integration/hello-world/e2e/fastify-middleware-before-init.spec.ts

@@ -11,7 +11,6 @@ import {
   NestFastifyApplication,
 } from '@nestjs/platform-fastify';
 import { Test } from '@nestjs/testing';
-import { expect } from 'chai';
 
 describe('Middleware before init (FastifyAdapter)', () => {
   let app: NestFastifyApplication;
@@ -81,11 +80,11 @@ describe('Middleware before init (FastifyAdapter)', () => {
           url: '/test',
         })
         .then(({ statusCode, payload, headers }) => {
-          expect(statusCode).to.equal(200);
-          expect(JSON.parse(payload)).to.deep.equal({ data: 'test_data' });
+          expect(statusCode).toBe(200);
+          expect(JSON.parse(payload)).toEqual({ data: 'test_data' });
           // Verify both module-level and global middleware were applied
-          expect(headers['x-middleware']).to.equal('applied');
-          expect(headers['x-global-middleware']).to.equal('applied');
+          expect(headers['x-middleware']).toBe('applied');
+          expect(headers['x-global-middleware']).toBe('applied');
         });
     });
 
@@ -123,8 +122,8 @@ describe('Middleware before init (FastifyAdapter)', () => {
           url: '/test',
         })
         .then(({ statusCode, payload }) => {
-          expect(statusCode).to.equal(200);
-          expect(JSON.parse(payload)).to.deep.equal({ data: 'test_data' });
+          expect(statusCode).toBe(200);
+          expect(JSON.parse(payload)).toEqual({ data: 'test_data' });
         });
     });
 

integration/hello-world/e2e/fastify-multiple.spec.ts

@@ -1,91 +1,4 @@
-/* Temporarily disabled due to various regressions
-
-import { FastifyAdapter, NestFastifyApplication } from '@nestjs/platform-fastify';
-import { Test } from '@nestjs/testing';
-import { expect } from 'chai';
-import { ApplicationModule } from '../src/app.module';
-
-describe('Hello world (fastify adapter with multiple applications)', () => {
-  let adapter: FastifyAdapter;
-  let apps: NestFastifyApplication[];
-
-  beforeEach(async () => {
-    const module1 = await Test.createTestingModule({
-      imports: [ApplicationModule],
-    }).compile();
-    const module2 = await Test.createTestingModule({
-      imports: [ApplicationModule],
-    }).compile();
-
-    adapter = new FastifyAdapter();
-
-    apps = [
-      module1.createNestApplication<NestFastifyApplication>(adapter),
-      module2
-        .createNestApplication<NestFastifyApplication>(adapter, {
-          bodyParser: false,
-        })
-        .setGlobalPrefix('/app2'),
-    ];
-    await Promise.all(apps.map(app => app.init()));
-  });
-
-  it(`/GET`, () => {
-    return adapter
-      .inject({
-        method: 'GET',
-        url: '/hello',
-      })
-      .then(({ payload }) => expect(payload).to.be.eql('Hello world!'));
-  });
-
-  it(`/GET (app2)`, () => {
-    return adapter
-      .inject({
-        method: 'GET',
-        url: '/app2/hello',
-      })
-      .then(({ payload }) => expect(payload).to.be.eql('Hello world!'));
-  });
-
-  it(`/GET (Promise/async)`, () => {
-    return adapter
-      .inject({
-        method: 'GET',
-        url: '/hello/async',
-      })
-      .then(({ payload }) => expect(payload).to.be.eql('Hello world!'));
-  });
-
-  it(`/GET (app2 Promise/async)`, () => {
-    return adapter
-      .inject({
-        method: 'GET',
-        url: '/app2/hello/async',
-      })
-      .then(({ payload }) => expect(payload).to.be.eql('Hello world!'));
-  });
-
-  it(`/GET (Observable stream)`, () => {
-    return adapter
-      .inject({
-        method: 'GET',
-        url: '/hello/stream',
-      })
-      .then(({ payload }) => expect(payload).to.be.eql('Hello world!'));
-  });
-
-  it(`/GET (app2 Observable stream)`, () => {
-    return adapter
-      .inject({
-        method: 'GET',
-        url: '/app2/hello/stream',
-      })
-      .then(({ payload }) => expect(payload).to.be.eql('Hello world!'));
-  });
-
-  afterEach(async () => {
-    await Promise.all(apps.map(app => app.close()));
-    await adapter.close();
-  });
-});*/
+// Temporarily disabled due to various regressions
+describe.skip('Hello world (fastify adapter with multiple applications)', () => {
+  it('placeholder', () => {});
+});

integration/hello-world/e2e/force-console.spec.ts

@@ -1,25 +1,23 @@
 import { ConsoleLogger, INestApplication } from '@nestjs/common';
 import { Test } from '@nestjs/testing';
-import * as request from 'supertest';
-import { AppModule } from '../src/app.module';
-import * as sinon from 'sinon';
-import { expect } from 'chai';
+import request from 'supertest';
+import { AppModule } from '../src/app.module.js';
 
 describe('ForceConsole Option', () => {
   let app: INestApplication;
 
   describe('When forceConsole is true', () => {
-    let consoleLogSpy: sinon.SinonSpy;
-    let consoleErrorSpy: sinon.SinonSpy;
-    let processStdoutSpy: sinon.SinonSpy;
-    let processStderrSpy: sinon.SinonSpy;
+    let consoleLogSpy: ReturnType<typeof vi.fn>;
+    let consoleErrorSpy: ReturnType<typeof vi.fn>;
+    let processStdoutSpy: ReturnType<typeof vi.fn>;
+    let processStderrSpy: ReturnType<typeof vi.fn>;
 
     beforeEach(async () => {
       // Spy on console and process methods
-      consoleLogSpy = sinon.spy(console, 'log');
-      consoleErrorSpy = sinon.spy(console, 'error');
-      processStdoutSpy = sinon.spy(process.stdout, 'write');
-      processStderrSpy = sinon.spy(process.stderr, 'write');
+      consoleLogSpy = vi.spyOn(console, 'log');
+      consoleErrorSpy = vi.spyOn(console, 'error');
+      processStdoutSpy = vi.spyOn(process.stdout, 'write');
+      processStderrSpy = vi.spyOn(process.stderr, 'write');
 
       const moduleRef = await Test.createTestingModule({
         imports: [AppModule],
@@ -34,10 +32,10 @@ describe('ForceConsole Option', () => {
     });
 
     afterEach(async () => {
-      consoleLogSpy.restore();
-      consoleErrorSpy.restore();
-      processStdoutSpy.restore();
-      processStderrSpy.restore();
+      consoleLogSpy.mockRestore();
+      consoleErrorSpy.mockRestore();
+      processStdoutSpy.mockRestore();
+      processStderrSpy.mockRestore();
       await app.close();
     });
 
@@ -46,14 +44,12 @@ describe('ForceConsole Option', () => {
       logger.log('Test log message');
 
       // Should use console.log when forceConsole is true
-      expect(consoleLogSpy.called).to.be.true;
+      expect(consoleLogSpy).toHaveBeenCalled();
       // Verify console.log was called with the message
-      const consoleLogCalls = consoleLogSpy
-        .getCalls()
-        .filter(call =>
-          call.args.some(arg => String(arg).includes('Test log message')),
-        );
-      expect(consoleLogCalls.length).to.be.greaterThan(0);
+      const consoleLogCalls = consoleLogSpy.mock.calls.filter(args =>
+        args.some(arg => String(arg).includes('Test log message')),
+      );
+      expect(consoleLogCalls.length).toBeGreaterThan(0);
     });
 
     it('should use console.error instead of process.stderr.write', async () => {
@@ -61,14 +57,12 @@ describe('ForceConsole Option', () => {
       logger.error('Test error message');
 
       // Should use console.error when forceConsole is true
-      expect(consoleErrorSpy.called).to.be.true;
+      expect(consoleErrorSpy).toHaveBeenCalled();
       // Verify console.error was called with the message
-      const consoleErrorCalls = consoleErrorSpy
-        .getCalls()
-        .filter(call =>
-          call.args.some(arg => String(arg).includes('Test error message')),
-        );
-      expect(consoleErrorCalls.length).to.be.greaterThan(0);
+      const consoleErrorCalls = consoleErrorSpy.mock.calls.filter(args =>
+        args.some(arg => String(arg).includes('Test error message')),
+      );
+      expect(consoleErrorCalls.length).toBeGreaterThan(0);
     });
 
     it('should handle GET request with forceConsole option enabled', () => {
@@ -77,17 +71,17 @@ describe('ForceConsole Option', () => {
   });
 
   describe('When forceConsole is false (default)', () => {
-    let consoleLogSpy: sinon.SinonSpy;
-    let consoleErrorSpy: sinon.SinonSpy;
-    let processStdoutSpy: sinon.SinonSpy;
-    let processStderrSpy: sinon.SinonSpy;
+    let consoleLogSpy: ReturnType<typeof vi.fn>;
+    let consoleErrorSpy: ReturnType<typeof vi.fn>;
+    let processStdoutSpy: ReturnType<typeof vi.fn>;
+    let processStderrSpy: ReturnType<typeof vi.fn>;
 
     beforeEach(async () => {
       // Spy on console and process methods
-      consoleLogSpy = sinon.spy(console, 'log');
-      consoleErrorSpy = sinon.spy(console, 'error');
-      processStdoutSpy = sinon.spy(process.stdout, 'write');
-      processStderrSpy = sinon.spy(process.stderr, 'write');
+      consoleLogSpy = vi.spyOn(console, 'log');
+      consoleErrorSpy = vi.spyOn(console, 'error');
+      processStdoutSpy = vi.spyOn(process.stdout, 'write');
+      processStderrSpy = vi.spyOn(process.stderr, 'write');
 
       const moduleRef = await Test.createTestingModule({
         imports: [AppModule],
@@ -102,10 +96,10 @@ describe('ForceConsole Option', () => {
     });
 
     afterEach(async () => {
-      consoleLogSpy.restore();
-      consoleErrorSpy.restore();
-      processStdoutSpy.restore();
-      processStderrSpy.restore();
+      consoleLogSpy.mockRestore();
+      consoleErrorSpy.mockRestore();
+      processStdoutSpy.mockRestore();
+      processStderrSpy.mockRestore();
       await app.close();
     });
 
@@ -113,31 +107,31 @@ describe('ForceConsole Option', () => {
       const logger = new ConsoleLogger('TestContext');
 
       // Reset spy to ensure clean state
-      consoleLogSpy.resetHistory();
+      consoleLogSpy.mockClear();
 
       logger.log('Test log message');
 
       // When forceConsole is false, should not call console.log
-      expect(consoleLogSpy.called).to.be.false;
+      expect(consoleLogSpy).not.toHaveBeenCalled();
     });
 
     it('should not directly call console.error when forceConsole is false', async () => {
       const logger = new ConsoleLogger('TestContext');
 
       // Reset spy to ensure clean state
-      consoleErrorSpy.resetHistory();
+      consoleErrorSpy.mockClear();
 
       logger.error('Test error message');
 
       // When forceConsole is false, should not call console.error
-      expect(consoleErrorSpy.called).to.be.false;
+      expect(consoleErrorSpy).not.toHaveBeenCalled();
     });
   });
 
   describe('When forceConsole is set via NestFactory.create', () => {
     it('should apply forceConsole to the default logger', async () => {
-      const consoleLogSpy = sinon.spy(console, 'log');
-      const processStdoutSpy = sinon.spy(process.stdout, 'write');
+      const consoleLogSpy = vi.spyOn(console, 'log');
+      const processStdoutSpy = vi.spyOn(process.stdout, 'write');
 
       const moduleRef = await Test.createTestingModule({
         imports: [AppModule],
@@ -153,10 +147,10 @@ describe('ForceConsole Option', () => {
       const logger = new ConsoleLogger('AppContext', { forceConsole: true });
       logger.log('Application started');
 
-      expect(consoleLogSpy.called).to.be.true;
+      expect(consoleLogSpy).toHaveBeenCalled();
 
-      consoleLogSpy.restore();
-      processStdoutSpy.restore();
+      consoleLogSpy.mockRestore();
+      processStdoutSpy.mockRestore();
       await testApp.close();
     });
   });

integration/hello-world/e2e/guards.spec.ts

@@ -5,8 +5,8 @@ import {
 } from '@nestjs/common';
 import { APP_GUARD } from '@nestjs/core';
 import { Test } from '@nestjs/testing';
-import * as request from 'supertest';
-import { AppModule } from '../src/app.module';
+import request from 'supertest';
+import { AppModule } from '../src/app.module.js';
 
 @Injectable()
 export class AuthGuard {
@@ -33,10 +33,31 @@ function createTestModule(guard) {
 describe('Guards', () => {
   let app: INestApplication;
 
+  afterEach(async () => {
+    await app.close();
+  });
+
   it(`should prevent access (unauthorized)`, async () => {
     app = (await createTestModule(new AuthGuard())).createNestApplication();
 
     await app.init();
-    return request(app.getHttpServer()).get('/hello').expect(401);
+    return request(app.getHttpServer())
+      .get('/hello')
+      .expect(401)
+      .expect(({ body }) => {
+        expect(body.message).toBe('Unauthorized');
+        expect(body.statusCode).toBe(401);
+      });
+  });
+
+  it(`should allow access when guard returns true`, async () => {
+    const allowGuard = { canActivate: () => true };
+    app = (await createTestModule(allowGuard)).createNestApplication();
+
+    await app.init();
+    return request(app.getHttpServer())
+      .get('/hello')
+      .expect(200)
+      .expect('Hello world!');
   });
 });

integration/hello-world/e2e/hello-world.spec.ts

@@ -1,7 +1,7 @@
-import * as request from 'supertest';
+import request from 'supertest';
 import { Test } from '@nestjs/testing';
 import { INestApplication } from '@nestjs/common';
-import { AppModule } from '../src/app.module';
+import { AppModule } from '../src/app.module.js';
 
 describe('Hello world (default adapter)', () => {
   let server;

integration/hello-world/e2e/interceptors.spec.ts

@@ -9,8 +9,8 @@ import { APP_INTERCEPTOR } from '@nestjs/core';
 import { Test } from '@nestjs/testing';
 import { of } from 'rxjs';
 import { map } from 'rxjs/operators';
-import * as request from 'supertest';
-import { AppModule } from '../src/app.module';
+import request from 'supertest';
+import { AppModule } from '../src/app.module.js';
 
 const RETURN_VALUE = 'test';
 

integration/hello-world/e2e/local-pipes.spec.ts

@@ -1,7 +1,7 @@
 import { INestApplication } from '@nestjs/common';
 import { Test } from '@nestjs/testing';
-import * as request from 'supertest';
-import { AppModule } from '../src/app.module';
+import request from 'supertest';
+import { AppModule } from '../src/app.module.js';
 
 describe('Hello world (default adapter)', () => {
   let server;

integration/hello-world/e2e/middleware-class.spec.ts

@@ -9,8 +9,8 @@ import {
 } from '@nestjs/common';
 import { Test } from '@nestjs/testing';
 import { Response } from 'express';
-import * as request from 'supertest';
-import { AppModule } from '../src/app.module';
+import request from 'supertest';
+import { AppModule } from '../src/app.module.js';
 
 const INCLUDED_VALUE = 'test_included';
 const RETURN_VALUE = 'test';

integration/hello-world/e2e/middleware-execute-order.spec.ts

@@ -5,7 +5,7 @@ import {
   Module,
 } from '@nestjs/common';
 import { Test } from '@nestjs/testing';
-import * as request from 'supertest';
+import request from 'supertest';
 
 const RETURN_VALUE_A = 'test_A';
 const RETURN_VALUE_B = 'test_B';

integration/hello-world/e2e/middleware-fastify.spec.ts

@@ -15,10 +15,9 @@ import {
   NestFastifyApplication,
 } from '@nestjs/platform-fastify';
 import { Test } from '@nestjs/testing';
-import { expect } from 'chai';
 import { FastifyRequest } from 'fastify';
-import * as request from 'supertest';
-import { AppModule } from '../src/app.module';
+import request from 'supertest';
+import { AppModule } from '../src/app.module.js';
 
 describe('Middleware (FastifyAdapter)', () => {
   let app: NestFastifyApplication;
@@ -117,7 +116,7 @@ describe('Middleware (FastifyAdapter)', () => {
           method: 'GET',
           url: '/hello',
         })
-        .then(({ payload }) => expect(payload).to.be.eql(RETURN_VALUE));
+        .then(({ payload }) => expect(payload).toEqual(RETURN_VALUE));
     });
 
     it(`forRoutes(TestController)`, () => {
@@ -126,7 +125,7 @@ describe('Middleware (FastifyAdapter)', () => {
           method: 'GET',
           url: '/test',
         })
-        .then(({ payload }) => expect(payload).to.be.eql(SCOPED_VALUE));
+        .then(({ payload }) => expect(payload).toEqual(SCOPED_VALUE));
     });
 
     it(`query?test=${QUERY_VALUE} forRoutes(query)`, () => {
@@ -138,7 +137,7 @@ describe('Middleware (FastifyAdapter)', () => {
             test: QUERY_VALUE,
           },
         })
-        .then(({ payload }) => expect(payload).to.be.eql(QUERY_VALUE));
+        .then(({ payload }) => expect(payload).toEqual(QUERY_VALUE));
     });
 
     it(`${QUERY_VALUE}?test=${QUERY_VALUE} forRoutes(${QUERY_VALUE})`, () => {
@@ -150,7 +149,7 @@ describe('Middleware (FastifyAdapter)', () => {
             test: QUERY_VALUE,
           },
         })
-        .then(({ payload }) => expect(payload).to.be.eql(QUERY_VALUE));
+        .then(({ payload }) => expect(payload).toEqual(QUERY_VALUE));
     });
 
     it(`forRoutes(tests/*path)`, () => {
@@ -159,7 +158,7 @@ describe('Middleware (FastifyAdapter)', () => {
           method: 'GET',
           url: '/tests/wildcard_nested',
         })
-        .then(({ payload }) => expect(payload).to.be.eql(WILDCARD_VALUE));
+        .then(({ payload }) => expect(payload).toEqual(WILDCARD_VALUE));
     });
 
     it(`forRoutes(express_style_wildcard/*)`, () => {
@@ -168,7 +167,7 @@ describe('Middleware (FastifyAdapter)', () => {
           method: 'GET',
           url: '/express_style_wildcard/wildcard_nested',
         })
-        .then(({ payload }) => expect(payload).to.be.eql(WILDCARD_VALUE));
+        .then(({ payload }) => expect(payload).toEqual(WILDCARD_VALUE));
     });
 
     it(`forRoutes(legacy_style_wildcard/*)`, () => {
@@ -177,7 +176,7 @@ describe('Middleware (FastifyAdapter)', () => {
           method: 'GET',
           url: '/legacy_style_wildcard/wildcard_nested',
         })
-        .then(({ payload }) => expect(payload).to.be.eql(WILDCARD_VALUE));
+        .then(({ payload }) => expect(payload).toEqual(WILDCARD_VALUE));
     });
 
     it(`forRoutes(req/url/)`, () => {
@@ -187,7 +186,7 @@ describe('Middleware (FastifyAdapter)', () => {
           method: 'GET',
           url: `/req/url${reqUrl}`,
         })
-        .then(({ payload }) => expect(payload).to.be.eql(REQ_URL_VALUE));
+        .then(({ payload }) => expect(payload).toEqual(REQ_URL_VALUE));
     });
 
     it(`GET forRoutes(POST tests/included)`, () => {
@@ -196,7 +195,7 @@ describe('Middleware (FastifyAdapter)', () => {
           method: 'GET',
           url: '/tests/included',
         })
-        .then(({ payload }) => expect(payload).to.be.eql(WILDCARD_VALUE));
+        .then(({ payload }) => expect(payload).toEqual(WILDCARD_VALUE));
     });
 
     it(`POST forRoutes(POST tests/included)`, () => {
@@ -205,7 +204,7 @@ describe('Middleware (FastifyAdapter)', () => {
           method: 'POST',
           url: '/tests/included',
         })
-        .then(({ payload }) => expect(payload).to.be.eql(INCLUDED_VALUE));
+        .then(({ payload }) => expect(payload).toEqual(INCLUDED_VALUE));
     });
 
     it(`GET forRoutes(POST /tests/%69ncluded) - ensure middleware is executed correctly with encoded characters`, () => {
@@ -214,7 +213,7 @@ describe('Middleware (FastifyAdapter)', () => {
           method: 'POST',
           url: '/tests/%69ncluded', // 'i' character is encoded
         })
-        .then(({ payload }) => expect(payload).to.be.eql(INCLUDED_VALUE));
+        .then(({ payload }) => expect(payload).toEqual(INCLUDED_VALUE));
     });
 
     afterEach(async () => {
@@ -329,7 +328,7 @@ describe('Middleware (FastifyAdapter)', () => {
           url: '/a/b/c',
         })
         .then(({ payload }) => {
-          expect(payload).to.be.eql(
+          expect(payload).toEqual(
             JSON.stringify({
               success: true,
               actual: 1,
@@ -346,7 +345,7 @@ describe('Middleware (FastifyAdapter)', () => {
           url: '/a/b',
         })
         .then(({ payload }) =>
-          expect(payload).to.be.eql(
+          expect(payload).toEqual(
             JSON.stringify({
               success: true,
               actual: 1,
@@ -363,7 +362,7 @@ describe('Middleware (FastifyAdapter)', () => {
           url: '/a',
         })
         .then(({ payload }) =>
-          expect(payload).to.be.eql(
+          expect(payload).toEqual(
             JSON.stringify({
               success: true,
               actual: 1,
@@ -380,7 +379,7 @@ describe('Middleware (FastifyAdapter)', () => {
           url: '/similar',
         })
         .then(({ payload }) =>
-          expect(payload).to.be.eql(
+          expect(payload).toEqual(
             JSON.stringify({
               success: true,
               actual: 1,
@@ -397,7 +396,7 @@ describe('Middleware (FastifyAdapter)', () => {
           url: '/similar/test',
         })
         .then(({ payload }) =>
-          expect(payload).to.be.eql(
+          expect(payload).toEqual(
             JSON.stringify({
               success: true,
               actual: 1,
@@ -414,7 +413,7 @@ describe('Middleware (FastifyAdapter)', () => {
           url: '/similar/arbitrary',
         })
         .then(({ payload }) =>
-          expect(payload).to.be.eql(
+          expect(payload).toEqual(
             JSON.stringify({
               success: true,
               actual: 1,
@@ -494,7 +493,7 @@ describe('Middleware (FastifyAdapter)', () => {
           url: '/api/pong',
         })
         .then(({ payload }) =>
-          expect(payload).to.be.eql(
+          expect(payload).toEqual(
             JSON.stringify({
               success: true,
               pong: 'pong',
@@ -513,7 +512,7 @@ describe('Middleware (FastifyAdapter)', () => {
           url: '/api',
         })
         .then(({ payload }) =>
-          expect(payload).to.be.eql(
+          expect(payload).toEqual(
             JSON.stringify({
               success: true,
               pong: 'pong',
@@ -531,7 +530,7 @@ describe('Middleware (FastifyAdapter)', () => {
           url: '/pong',
         })
         .then(({ payload }) =>
-          expect(payload).to.be.eql(
+          expect(payload).toEqual(
             JSON.stringify({
               success: true,
               pong: 'pong',

integration/hello-world/e2e/middleware-run-match-route.ts

@@ -7,10 +7,8 @@ import {
   NestMiddleware,
   Module,
 } from '@nestjs/common';
-import { Test } from '../../../packages/testing';
-import * as request from 'supertest';
-import { expect } from 'chai';
-
+import { Test } from '../../../packages/testing.js';
+import request from 'supertest';
 /**
  * Number of times that the middleware was executed.
  */

integration/hello-world/e2e/middleware-with-versioning.spec.ts

@@ -6,14 +6,14 @@ import {
   Module,
   RequestMethod,
   Version,
+  VERSION_NEUTRAL,
   VersioningOptions,
   VersioningType,
-  VERSION_NEUTRAL,
 } from '@nestjs/common';
-import { CustomVersioningOptions } from '@nestjs/common/interfaces';
+import { CustomVersioningOptions } from '@nestjs/common/interfaces/index.js';
 import { Test } from '@nestjs/testing';
-import * as request from 'supertest';
-import { AppModule } from '../src/app.module';
+import request from 'supertest';
+import { AppModule } from '../src/app.module.js';
 
 const RETURN_VALUE = 'test';
 const VERSIONED_VALUE = 'test_versioned';

integration/hello-world/e2e/middleware.spec.ts

@@ -6,8 +6,8 @@ import {
   Module,
 } from '@nestjs/common';
 import { Test } from '@nestjs/testing';
-import * as request from 'supertest';
-import { AppModule } from '../src/app.module';
+import request from 'supertest';
+import { AppModule } from '../src/app.module.js';
 
 const RETURN_VALUE = 'test';
 const SCOPED_VALUE = 'test_scoped';

integration/hello-world/e2e/router-module-middleware.spec.ts

@@ -7,8 +7,8 @@ import {
 } from '@nestjs/common';
 import { RouterModule } from '@nestjs/core';
 import { Test } from '@nestjs/testing';
-import * as request from 'supertest';
-import { AppModule } from '../src/app.module';
+import request from 'supertest';
+import { AppModule } from '../src/app.module.js';
 
 const RETURN_VALUE = 'test';
 const SCOPED_VALUE = 'test_scoped';

integration/hello-world/e2e/router-module.spec.ts

@@ -1,7 +1,7 @@
 import { Controller, Get, INestApplication, Module } from '@nestjs/common';
 import { RouterModule, Routes } from '@nestjs/core';
 import { Test } from '@nestjs/testing';
-import * as request from 'supertest';
+import request from 'supertest';
 
 describe('RouterModule', () => {
   let app: INestApplication;
@@ -66,7 +66,7 @@ describe('RouterModule', () => {
   })
   class AppModule {}
 
-  before(async () => {
+  beforeAll(async () => {
     const moduleRef = await Test.createTestingModule({
       imports: [MainModule, AppModule],
     }).compile();

integration/hello-world/e2e/schema-in-pipes.spec.ts

@@ -0,0 +1,166 @@
+import {
+  ArgumentMetadata,
+  Body,
+  Controller,
+  createParamDecorator,
+  ExecutionContext,
+  Get,
+  INestApplication,
+  Injectable,
+  Module,
+  Param,
+  PipeTransform,
+  Post,
+  Query,
+} from '@nestjs/common';
+import { Test } from '@nestjs/testing';
+import type { StandardSchemaV1 } from '@standard-schema/spec';
+import request from 'supertest';
+
+const testSchema: StandardSchemaV1 = {
+  '~standard': {
+    version: 1,
+    vendor: 'test',
+    validate: (value: unknown) => ({ value }),
+  },
+};
+
+/**
+ * A pipe that captures the ArgumentMetadata it receives,
+ * so the test can verify that `schema` is propagated.
+ */
+@Injectable()
+class SchemaCaptorPipe implements PipeTransform {
+  static lastMetadata: ArgumentMetadata | undefined;
+
+  transform(value: any, metadata: ArgumentMetadata) {
+    SchemaCaptorPipe.lastMetadata = metadata;
+    return value;
+  }
+}
+
+const CustomParam = createParamDecorator(
+  (data: unknown, ctx: ExecutionContext) => {
+    return ctx.switchToHttp().getRequest().query;
+  },
+);
+
+@Controller('schema-test')
+class SchemaTestController {
+  @Post('body')
+  bodyWithSchema(
+    @Body({ schema: testSchema, pipes: [SchemaCaptorPipe] }) body: any,
+  ) {
+    return { received: body };
+  }
+
+  @Get('query')
+  queryWithSchema(
+    @Query({ schema: testSchema, pipes: [SchemaCaptorPipe] }) query: any,
+  ) {
+    return { received: query };
+  }
+
+  @Get('param/:id')
+  paramWithSchema(
+    @Param('id', { schema: testSchema, pipes: [SchemaCaptorPipe] }) id: string,
+  ) {
+    return { received: id };
+  }
+
+  @Get('custom')
+  customWithSchema(
+    @CustomParam({ schema: testSchema, pipes: [SchemaCaptorPipe] }) value: any,
+  ) {
+    return { received: value };
+  }
+
+  @Post('body-property')
+  bodyPropertyWithSchema(
+    @Body('name', { schema: testSchema, pipes: [SchemaCaptorPipe] })
+    name: string,
+  ) {
+    return { received: name };
+  }
+}
+
+@Module({
+  controllers: [SchemaTestController],
+  providers: [SchemaCaptorPipe],
+})
+class SchemaTestModule {}
+
+describe('Schema propagation to pipes', () => {
+  let app: INestApplication;
+  let server: any;
+
+  beforeAll(async () => {
+    const module = await Test.createTestingModule({
+      imports: [SchemaTestModule],
+    }).compile();
+
+    app = module.createNestApplication();
+    server = app.getHttpServer();
+    await app.init();
+  });
+
+  beforeEach(() => {
+    SchemaCaptorPipe.lastMetadata = undefined;
+  });
+
+  afterAll(async () => {
+    await app.close();
+  });
+
+  it('should pass schema to pipe via @Body(options)', async () => {
+    await request(server)
+      .post('/schema-test/body')
+      .send({ name: 'test' })
+      .expect(201);
+
+    expect(SchemaCaptorPipe.lastMetadata).toBeDefined();
+    expect(SchemaCaptorPipe.lastMetadata!.schema).toBe(testSchema);
+    expect(SchemaCaptorPipe.lastMetadata!.type).toBe('body');
+  });
+
+  it('should pass schema to pipe via @Query(options)', async () => {
+    await request(server).get('/schema-test/query?user=john').expect(200);
+
+    expect(SchemaCaptorPipe.lastMetadata).toBeDefined();
+    expect(SchemaCaptorPipe.lastMetadata!.schema).toBe(testSchema);
+    expect(SchemaCaptorPipe.lastMetadata!.type).toBe('query');
+  });
+
+  it('should pass schema to pipe via @Param(property, options)', async () => {
+    await request(server)
+      .get('/schema-test/param/42')
+      .expect(200)
+      .expect({ received: '42' });
+
+    expect(SchemaCaptorPipe.lastMetadata).toBeDefined();
+    expect(SchemaCaptorPipe.lastMetadata!.schema).toBe(testSchema);
+    expect(SchemaCaptorPipe.lastMetadata!.type).toBe('param');
+    expect(SchemaCaptorPipe.lastMetadata!.data).toBe('id');
+  });
+
+  it('should pass schema to pipe via createParamDecorator(options)', async () => {
+    await request(server).get('/schema-test/custom?key=val').expect(200);
+
+    expect(SchemaCaptorPipe.lastMetadata).toBeDefined();
+    expect(SchemaCaptorPipe.lastMetadata!.schema).toBe(testSchema);
+    expect(SchemaCaptorPipe.lastMetadata!.type).toBe('custom');
+  });
+
+  it('should pass schema to pipe via @Body(property, options)', async () => {
+    await request(server)
+      .post('/schema-test/body-property')
+      .send({ name: 'Alice' })
+      .expect(201)
+      .expect({ received: 'Alice' });
+
+    expect(SchemaCaptorPipe.lastMetadata).toBeDefined();
+    expect(SchemaCaptorPipe.lastMetadata!.schema).toBe(testSchema);
+    expect(SchemaCaptorPipe.lastMetadata!.type).toBe('body');
+    expect(SchemaCaptorPipe.lastMetadata!.data).toBe('name');
+  });
+});

integration/hello-world/e2e/standard-schema-serializer.spec.ts

@@ -0,0 +1,316 @@
+import {
+  Controller,
+  Get,
+  INestApplication,
+  Module,
+  SerializeOptions,
+  StandardSchemaSerializerInterceptor,
+  UseInterceptors,
+} from '@nestjs/common';
+import { APP_INTERCEPTOR, Reflector } from '@nestjs/core';
+import { Test } from '@nestjs/testing';
+import type { StandardSchemaV1 } from '@standard-schema/spec';
+import request from 'supertest';
+
+// ─── Test schemas ──────────────────────────────────────────────
+
+/**
+ * Schema that strips out the `password` field (simulating a "safe user" DTO).
+ */
+const safeUserSchema: StandardSchemaV1 = {
+  '~standard': {
+    version: 1,
+    vendor: 'test',
+    validate: (value: unknown) => {
+      const { password, ...safe } = value as Record<string, unknown>;
+      return { value: safe };
+    },
+  },
+};
+
+/**
+ * Schema that adds a `serialized: true` flag (useful for asserting the schema ran).
+ */
+const flagSchema: StandardSchemaV1 = {
+  '~standard': {
+    version: 1,
+    vendor: 'test',
+    validate: (value: unknown) => ({
+      value: { ...(value as any), serialized: true },
+    }),
+  },
+};
+
+/**
+ * Schema that always fails — used for the error case.
+ */
+const failingSchema: StandardSchemaV1 = {
+  '~standard': {
+    version: 1,
+    vendor: 'test',
+    validate: () => ({
+      issues: [{ message: 'not allowed' }],
+    }),
+  },
+};
+
+/**
+ * Async schema — validates that the interceptor awaits promises.
+ */
+const asyncSchema: StandardSchemaV1 = {
+  '~standard': {
+    version: 1,
+    vendor: 'test',
+    validate: async (value: unknown) => ({
+      value: { ...(value as any), async: true },
+    }),
+  },
+};
+
+// ─── Controllers ───────────────────────────────────────────────
+
+@Controller('serializer')
+@UseInterceptors(StandardSchemaSerializerInterceptor)
+class SerializerTestController {
+  @Get('user')
+  @SerializeOptions({ schema: safeUserSchema })
+  getUser() {
+    return { id: 1, name: 'Alice', password: 'secret123' };
+  }
+
+  @Get('users')
+  @SerializeOptions({ schema: safeUserSchema })
+  getUsers() {
+    return [
+      { id: 1, name: 'Alice', password: 'pw1' },
+      { id: 2, name: 'Bob', password: 'pw2' },
+    ];
+  }
+
+  @Get('flagged')
+  @SerializeOptions({ schema: flagSchema })
+  getFlagged() {
+    return { id: 1 };
+  }
+
+  @Get('no-schema')
+  getNoSchema() {
+    return { id: 1, secret: 'visible' };
+  }
+
+  @Get('failing')
+  @SerializeOptions({ schema: failingSchema })
+  getFailing() {
+    return { id: 1 };
+  }
+
+  @Get('async')
+  @SerializeOptions({ schema: asyncSchema })
+  getAsync() {
+    return { id: 1 };
+  }
+
+  @Get('primitive')
+  @SerializeOptions({ schema: failingSchema })
+  getPrimitive() {
+    return 'plain string';
+  }
+}
+
+/**
+ * Controller-level schema applied via class decorator — all routes inherit it.
+ */
+@Controller('class-level')
+@UseInterceptors(StandardSchemaSerializerInterceptor)
+@SerializeOptions({ schema: safeUserSchema })
+class ClassLevelSerializerController {
+  @Get('user')
+  getUser() {
+    return { id: 1, name: 'Carol', password: 'secret' };
+  }
+
+  @Get('override')
+  @SerializeOptions({ schema: flagSchema })
+  getOverride() {
+    return { id: 1, name: 'Carol', password: 'secret' };
+  }
+}
+
+/**
+ * Controller demonstrating global interceptor registration with a default schema.
+ */
+@Controller('global')
+class GlobalSerializerController {
+  @Get('default')
+  getDefault() {
+    return { id: 1, name: 'Dave', password: 'global-secret' };
+  }
+
+  @Get('override')
+  @SerializeOptions({ schema: flagSchema })
+  getOverride() {
+    return { id: 1 };
+  }
+}
+
+@Module({
+  controllers: [SerializerTestController, ClassLevelSerializerController],
+})
+class SerializerTestModule {}
+
+@Module({
+  controllers: [GlobalSerializerController],
+  providers: [
+    {
+      provide: APP_INTERCEPTOR,
+      useFactory: (reflector: Reflector) =>
+        new StandardSchemaSerializerInterceptor(reflector, {
+          schema: safeUserSchema,
+        }),
+      inject: [Reflector],
+    },
+  ],
+})
+class GlobalSerializerTestModule {}
+
+// ─── Tests ─────────────────────────────────────────────────────
+
+describe('StandardSchemaSerializerInterceptor (integration)', () => {
+  let app: INestApplication;
+
+  afterEach(async () => {
+    await app.close();
+  });
+
+  describe('handler-level @SerializeOptions', () => {
+    beforeEach(async () => {
+      const module = await Test.createTestingModule({
+        imports: [SerializerTestModule],
+      }).compile();
+
+      app = module.createNestApplication();
+      await app.init();
+    });
+
+    it('should strip fields via schema on a single object', () => {
+      return request(app.getHttpServer())
+        .get('/serializer/user')
+        .expect(200)
+        .expect(({ body }) => {
+          expect(body).toEqual({ id: 1, name: 'Alice' });
+          expect(body).not.toHaveProperty('password');
+        });
+    });
+
+    it('should apply schema to each item in an array response', () => {
+      return request(app.getHttpServer())
+        .get('/serializer/users')
+        .expect(200)
+        .expect(({ body }) => {
+          expect(body).toEqual([
+            { id: 1, name: 'Alice' },
+            { id: 2, name: 'Bob' },
+          ]);
+          body.forEach((item: any) =>
+            expect(item).not.toHaveProperty('password'),
+          );
+        });
+    });
+
+    it('should augment response through the schema', () => {
+      return request(app.getHttpServer())
+        .get('/serializer/flagged')
+        .expect(200)
+        .expect({ id: 1, serialized: true });
+    });
+
+    it('should return response unchanged when no schema is set', () => {
+      return request(app.getHttpServer())
+        .get('/serializer/no-schema')
+        .expect(200)
+        .expect({ id: 1, secret: 'visible' });
+    });
+
+    it('should return 500 when schema validation fails', () => {
+      return request(app.getHttpServer())
+        .get('/serializer/failing')
+        .expect(500);
+    });
+
+    it('should handle async schemas', () => {
+      return request(app.getHttpServer())
+        .get('/serializer/async')
+        .expect(200)
+        .expect({ id: 1, async: true });
+    });
+
+    it('should pass primitive values through even when a schema is set', () => {
+      return request(app.getHttpServer())
+        .get('/serializer/primitive')
+        .expect(200)
+        .expect(({ text }) => {
+          expect(text).toBe('plain string');
+        });
+    });
+  });
+
+  describe('class-level @SerializeOptions', () => {
+    beforeEach(async () => {
+      const module = await Test.createTestingModule({
+        imports: [SerializerTestModule],
+      }).compile();
+
+      app = module.createNestApplication();
+      await app.init();
+    });
+
+    it('should apply class-level schema to all routes', () => {
+      return request(app.getHttpServer())
+        .get('/class-level/user')
+        .expect(200)
+        .expect(({ body }) => {
+          expect(body).toEqual({ id: 1, name: 'Carol' });
+          expect(body).not.toHaveProperty('password');
+        });
+    });
+
+    it('should allow handler-level schema to override class-level', () => {
+      return request(app.getHttpServer())
+        .get('/class-level/override')
+        .expect(200)
+        .expect(({ body }) => {
+          // flagSchema adds `serialized: true` but does NOT strip password
+          expect(body).toHaveProperty('serialized', true);
+          expect(body).toHaveProperty('password', 'secret');
+        });
+    });
+  });
+
+  describe('global interceptor with default schema', () => {
+    beforeEach(async () => {
+      const module = await Test.createTestingModule({
+        imports: [GlobalSerializerTestModule],
+      }).compile();
+
+      app = module.createNestApplication();
+      await app.init();
+    });
+
+    it('should apply the default schema globally', () => {
+      return request(app.getHttpServer())
+        .get('/global/default')
+        .expect(200)
+        .expect(({ body }) => {
+          expect(body).toEqual({ id: 1, name: 'Dave' });
+          expect(body).not.toHaveProperty('password');
+        });
+    });
+
+    it('should let @SerializeOptions override the global default', () => {
+      return request(app.getHttpServer())
+        .get('/global/override')
+        .expect(200)
+        .expect({ id: 1, serialized: true });
+    });
+  });
+});

integration/hello-world/src/app.module.ts

@@ -1,7 +1,7 @@
 import { Module } from '@nestjs/common';
-import { HelloModule } from './hello/hello.module';
-import { HostArrayModule } from './host-array/host-array.module';
-import { HostModule } from './host/host.module';
+import { HelloModule } from './hello/hello.module.js';
+import { HostArrayModule } from './host-array/host-array.module.js';
+import { HostModule } from './host/host.module.js';
 
 @Module({
   imports: [HelloModule, HostModule, HostArrayModule],

integration/hello-world/src/hello/hello.controller.ts

@@ -1,7 +1,7 @@
 import { Controller, Get, Header, Param } from '@nestjs/common';
 import { Observable, of } from 'rxjs';
-import { HelloService } from './hello.service';
-import { UserByIdPipe } from './users/user-by-id.pipe';
+import { HelloService } from './hello.service.js';
+import { UserByIdPipe } from './users/user-by-id.pipe.js';
 
 @Controller('hello')
 export class HelloController {

integration/hello-world/src/hello/hello.module.ts

@@ -1,7 +1,7 @@
 import { Module } from '@nestjs/common';
-import { HelloController } from './hello.controller';
-import { HelloService } from './hello.service';
-import { UsersService } from './users/users.service';
+import { HelloController } from './hello.controller.js';
+import { HelloService } from './hello.service.js';
+import { UsersService } from './users/users.service.js';
 
 @Module({
   controllers: [HelloController],

integration/hello-world/src/hello/users/user-by-id.pipe.ts

@@ -1,5 +1,5 @@
 import { PipeTransform, Injectable, ArgumentMetadata } from '@nestjs/common';
-import { UsersService } from './users.service';
+import { UsersService } from './users.service.js';
 
 @Injectable()
 export class UserByIdPipe implements PipeTransform<string> {

integration/hello-world/src/host-array/host-array.controller.ts

@@ -1,7 +1,7 @@
 import { Controller, Get, Header, HostParam, Param } from '@nestjs/common';
 import { Observable, of } from 'rxjs';
-import { HostArrayService } from './host-array.service';
-import { UserByIdPipe } from './users/user-by-id.pipe';
+import { HostArrayService } from './host-array.service.js';
+import { UserByIdPipe } from './users/user-by-id.pipe.js';
 
 @Controller({
   path: 'host-array',

integration/hello-world/src/host-array/host-array.module.ts

@@ -1,7 +1,7 @@
 import { Module } from '@nestjs/common';
-import { HostArrayController } from './host-array.controller';
-import { HostArrayService } from './host-array.service';
-import { UsersService } from './users/users.service';
+import { HostArrayController } from './host-array.controller.js';
+import { HostArrayService } from './host-array.service.js';
+import { UsersService } from './users/users.service.js';
 
 @Module({
   controllers: [HostArrayController],

integration/hello-world/src/host-array/users/user-by-id.pipe.ts

@@ -1,5 +1,5 @@
 import { PipeTransform, Injectable, ArgumentMetadata } from '@nestjs/common';
-import { UsersService } from './users.service';
+import { UsersService } from './users.service.js';
 
 @Injectable()
 export class UserByIdPipe implements PipeTransform<string> {

integration/hello-world/src/host/host.controller.ts

@@ -1,7 +1,7 @@
 import { Controller, Get, Header, HostParam, Param } from '@nestjs/common';
 import { Observable, of } from 'rxjs';
-import { HostService } from './host.service';
-import { UserByIdPipe } from './users/user-by-id.pipe';
+import { HostService } from './host.service.js';
+import { UserByIdPipe } from './users/user-by-id.pipe.js';
 
 @Controller({
   path: 'host',

integration/hello-world/src/host/host.module.ts

@@ -1,7 +1,7 @@
 import { Module } from '@nestjs/common';
-import { HostController } from './host.controller';
-import { HostService } from './host.service';
-import { UsersService } from './users/users.service';
+import { HostController } from './host.controller.js';
+import { HostService } from './host.service.js';
+import { UsersService } from './users/users.service.js';
 
 @Module({
   controllers: [HostController],

integration/hello-world/src/host/users/user-by-id.pipe.ts

@@ -1,5 +1,5 @@
 import { PipeTransform, Injectable, ArgumentMetadata } from '@nestjs/common';
-import { UsersService } from './users.service';
+import { UsersService } from './users.service.js';
 
 @Injectable()
 export class UserByIdPipe implements PipeTransform<string> {

integration/hello-world/tsconfig.json

@@ -1,13 +1,15 @@
 {
   "compilerOptions": {
+    "types": ["vitest/globals"],
     "module": "commonjs",
     "declaration": false,
     "noImplicitAny": false,
     "removeComments": true,
     "noLib": false,
+    "esModuleInterop": true,
     "emitDecoratorMetadata": true,
     "experimentalDecorators": true,
-    "target": "ES2021",
+    "target": "ES2023",
     "sourceMap": true,
     "allowJs": true,
     "strictNullChecks": true,

integration/hooks/e2e/before-app-shutdown.spec.ts

@@ -1,11 +1,8 @@
 import { BeforeApplicationShutdown, Injectable, Module } from '@nestjs/common';
 import { Test } from '@nestjs/testing';
-import { expect } from 'chai';
-import * as Sinon from 'sinon';
-
 @Injectable()
 class TestInjectable implements BeforeApplicationShutdown {
-  beforeApplicationShutdown = Sinon.spy();
+  beforeApplicationShutdown = vi.fn();
 }
 
 describe('BeforeApplicationShutdown', () => {
@@ -17,13 +14,13 @@ describe('BeforeApplicationShutdown', () => {
     const app = module.createNestApplication();
     await app.close();
     const instance = module.get(TestInjectable);
-    expect(instance.beforeApplicationShutdown.called).to.be.true;
+    expect(instance.beforeApplicationShutdown).toHaveBeenCalled();
   });
 
   it('should sort modules by distance (topological sort) - DESC order', async () => {
     @Injectable()
     class BB implements BeforeApplicationShutdown {
-      beforeApplicationShutdown = Sinon.spy();
+      beforeApplicationShutdown = vi.fn();
     }
 
     @Module({
@@ -35,7 +32,7 @@ describe('BeforeApplicationShutdown', () => {
     @Injectable()
     class AA implements BeforeApplicationShutdown {
       constructor(private bb: BB) {}
-      beforeApplicationShutdown = Sinon.spy();
+      beforeApplicationShutdown = vi.fn();
     }
     @Module({
       imports: [B],
@@ -53,9 +50,8 @@ describe('BeforeApplicationShutdown', () => {
 
     const aa = module.get(AA);
     const bb = module.get(BB);
-    Sinon.assert.callOrder(
-      aa.beforeApplicationShutdown,
-      bb.beforeApplicationShutdown,
-    );
+    expect(
+      aa.beforeApplicationShutdown.mock.invocationCallOrder[0],
+    ).toBeLessThan(bb.beforeApplicationShutdown.mock.invocationCallOrder[0]);
   });
 });

integration/hooks/e2e/enable-shutdown-hook.spec.ts

@@ -1,71 +1,81 @@
-import { expect } from 'chai';
 import { spawnSync } from 'child_process';
 import { join } from 'path';
 
+const nodeCmd = process.execPath;
+
+function spawnTsNode(...args: string[]) {
+  return spawnSync(nodeCmd, ['--import', 'jiti/register', ...args]);
+}
+
 describe('enableShutdownHooks', () => {
-  it('should call the correct hooks if any shutdown signal gets invoked', done => {
-    const result = spawnSync('ts-node', [
-      join(__dirname, '../src/enable-shutdown-hooks-main.ts'),
-      'SIGHUP',
-    ]);
-    const calls = result.stdout
-      .toString()
-      .split('\n')
-      .map((call: string) => call.trim());
-    expect(calls[0]).to.equal('beforeApplicationShutdown SIGHUP');
-    expect(calls[1]).to.equal('onApplicationShutdown SIGHUP');
-    done();
-  }).timeout(10000);
+  it('should call the correct hooks if any shutdown signal gets invoked', () =>
+    new Promise<void>(done => {
+      const result = spawnTsNode(
+        join(import.meta.dirname, '../src/enable-shutdown-hooks-main.ts'),
+        'SIGHUP',
+      );
+      const calls = result.stdout
+        .toString()
+        .split('\n')
+        .map((call: string) => call.trim());
+      expect(calls[0]).toBe('beforeApplicationShutdown SIGHUP');
+      expect(calls[1]).toBe('onApplicationShutdown SIGHUP');
+      done();
+    }));
 
-  it('should call the correct hooks if a specific shutdown signal gets invoked', done => {
-    const result = spawnSync('ts-node', [
-      join(__dirname, '../src/enable-shutdown-hooks-main.ts'),
-      'SIGINT',
-      'SIGINT',
-    ]);
-    const calls = result.stdout
-      .toString()
-      .split('\n')
-      .map((call: string) => call.trim());
-    expect(calls[0]).to.equal('beforeApplicationShutdown SIGINT');
-    expect(calls[1]).to.equal('onApplicationShutdown SIGINT');
-    done();
-  }).timeout(10000);
+  it('should call the correct hooks if a specific shutdown signal gets invoked', () =>
+    new Promise<void>(done => {
+      const result = spawnTsNode(
+        join(import.meta.dirname, '../src/enable-shutdown-hooks-main.ts'),
+        'SIGINT',
+        'SIGINT',
+      );
+      const calls = result.stdout
+        .toString()
+        .split('\n')
+        .map((call: string) => call.trim());
+      expect(calls[0]).toBe('beforeApplicationShutdown SIGINT');
+      expect(calls[1]).toBe('onApplicationShutdown SIGINT');
+      done();
+    }));
 
-  it('should ignore system signals which are not specified', done => {
-    const result = spawnSync('ts-node', [
-      join(__dirname, '../src/enable-shutdown-hooks-main.ts'),
-      'SIGINT',
-      'SIGHUP',
-    ]);
-    expect(result.stdout.toString().trim()).to.be.eq('');
-    done();
-  }).timeout(10000);
+  it('should ignore system signals which are not specified', () =>
+    new Promise<void>(done => {
+      const result = spawnTsNode(
+        join(import.meta.dirname, '../src/enable-shutdown-hooks-main.ts'),
+        'SIGINT',
+        'SIGHUP',
+      );
+      expect(result.stdout.toString().trim()).toBe('');
+      done();
+    }));
 
-  it('should ignore system signals if "enableShutdownHooks" was not called', done => {
-    const result = spawnSync('ts-node', [
-      join(__dirname, '../src/enable-shutdown-hooks-main.ts'),
-      'SIGINT',
-      'NONE',
-    ]);
-    expect(result.stdout.toString().trim()).to.be.eq('');
-    done();
-  }).timeout(10000);
+  it('should ignore system signals if "enableShutdownHooks" was not called', () =>
+    new Promise<void>(done => {
+      const result = spawnTsNode(
+        join(import.meta.dirname, '../src/enable-shutdown-hooks-main.ts'),
+        'SIGINT',
+        'NONE',
+      );
+      expect(result.stdout.toString().trim()).toBe('');
+      done();
+    }));
 
-  it('should call the correct hooks with useProcessExit option', done => {
-    const result = spawnSync('ts-node', [
-      join(__dirname, '../src/enable-shutdown-hooks-main.ts'),
-      'SIGHUP',
-      'SIGHUP',
-      'graceful',
-    ]);
-    const calls = result.stdout
-      .toString()
-      .split('\n')
-      .map((call: string) => call.trim());
-    expect(calls[0]).to.equal('beforeApplicationShutdown SIGHUP');
-    expect(calls[1]).to.equal('onApplicationShutdown SIGHUP');
-    expect(result.status).to.equal(0);
-    done();
-  }).timeout(10000);
+  it('should call the correct hooks with useProcessExit option', () =>
+    new Promise<void>(done => {
+      const result = spawnTsNode(
+        join(import.meta.dirname, '../src/enable-shutdown-hooks-main.ts'),
+        'SIGHUP',
+        'SIGHUP',
+        'graceful',
+      );
+      const calls = result.stdout
+        .toString()
+        .split('\n')
+        .map((call: string) => call.trim());
+      expect(calls[0]).toBe('beforeApplicationShutdown SIGHUP');
+      expect(calls[1]).toBe('onApplicationShutdown SIGHUP');
+      expect(result.status).toBe(0);
+      done();
+    }));
 });

integration/hooks/e2e/lifecycle-hook-order.spec.ts

@@ -1,13 +1,12 @@
-import { Test } from '@nestjs/testing';
-import * as Sinon from 'sinon';
 import {
+  BeforeApplicationShutdown,
   Injectable,
   OnApplicationBootstrap,
   OnApplicationShutdown,
   OnModuleDestroy,
   OnModuleInit,
-  BeforeApplicationShutdown,
 } from '@nestjs/common';
+import { Test } from '@nestjs/testing';
 
 @Injectable()
 class TestInjectable
@@ -18,11 +17,11 @@ class TestInjectable
     OnApplicationShutdown,
     BeforeApplicationShutdown
 {
-  onApplicationBootstrap = Sinon.spy();
-  beforeApplicationShutdown = Sinon.spy();
-  onApplicationShutdown = Sinon.spy();
-  onModuleDestroy = Sinon.spy();
-  onModuleInit = Sinon.spy();
+  onApplicationBootstrap = vi.fn();
+  beforeApplicationShutdown = vi.fn();
+  onApplicationShutdown = vi.fn();
+  onModuleDestroy = vi.fn();
+  onModuleInit = vi.fn();
 }
 
 describe('Lifecycle Hook Order', () => {
@@ -36,12 +35,17 @@ describe('Lifecycle Hook Order', () => {
     await app.close();
 
     const instance = module.get(TestInjectable);
-    Sinon.assert.callOrder(
+    const order = [
       instance.onModuleInit,
       instance.onApplicationBootstrap,
       instance.onModuleDestroy,
       instance.beforeApplicationShutdown,
       instance.onApplicationShutdown,
-    );
+    ];
+    for (let i = 0; i < order.length - 1; i++) {
+      expect(order[i].mock.invocationCallOrder[0]).toBeLessThan(
+        order[i + 1].mock.invocationCallOrder[0],
+      );
+    }
   });
 });

integration/hooks/e2e/on-app-boostrap.spec.ts

@@ -1,11 +1,8 @@
 import { Injectable, Module, OnApplicationBootstrap } from '@nestjs/common';
 import { Test } from '@nestjs/testing';
-import { expect } from 'chai';
-import * as Sinon from 'sinon';
-
 @Injectable()
 class TestInjectable implements OnApplicationBootstrap {
-  onApplicationBootstrap = Sinon.spy();
+  onApplicationBootstrap = vi.fn();
 }
 
 describe('OnApplicationBootstrap', () => {
@@ -17,7 +14,8 @@ describe('OnApplicationBootstrap', () => {
     const app = module.createNestApplication();
     await app.init();
     const instance = module.get(TestInjectable);
-    expect(instance.onApplicationBootstrap.called).to.be.true;
+    expect(instance.onApplicationBootstrap).toHaveBeenCalled();
+    await app.close();
   });
 
   it('should not throw an error when onApplicationBootstrap is null', async () => {
@@ -28,7 +26,8 @@ describe('OnApplicationBootstrap', () => {
     }).compile();
 
     const app = module.createNestApplication();
-    await app.init().then(obj => expect(obj).to.not.be.undefined);
+    await app.init().then(obj => expect(obj).not.toBeUndefined());
+    await app.close();
   });
 
   it('should not throw an error when onApplicationBootstrap is undefined', async () => {
@@ -39,7 +38,8 @@ describe('OnApplicationBootstrap', () => {
     }).compile();
 
     const app = module.createNestApplication();
-    await app.init().then(obj => expect(obj).to.not.be.undefined);
+    await app.init().then(obj => expect(obj).not.toBeUndefined());
+    await app.close();
   });
 
   it('should sort modules by distance (topological sort) - DESC order', async () => {
@@ -80,6 +80,7 @@ describe('OnApplicationBootstrap', () => {
     await app.init();
 
     const instance = module.get(AA);
-    expect(instance.field).to.equal('b-field_a-field');
+    expect(instance.field).toBe('b-field_a-field');
+    await app.close();
   });
 });

integration/hooks/e2e/on-app-shutdown.spec.ts

@@ -1,11 +1,8 @@
 import { Injectable, Module, OnApplicationShutdown } from '@nestjs/common';
 import { Test } from '@nestjs/testing';
-import { expect } from 'chai';
-import * as Sinon from 'sinon';
-
 @Injectable()
 class TestInjectable implements OnApplicationShutdown {
-  onApplicationShutdown = Sinon.spy();
+  onApplicationShutdown = vi.fn();
 }
 
 describe('OnApplicationShutdown', () => {
@@ -17,13 +14,13 @@ describe('OnApplicationShutdown', () => {
     const app = module.createNestApplication();
     await app.close();
     const instance = module.get(TestInjectable);
-    expect(instance.onApplicationShutdown.called).to.be.true;
+    expect(instance.onApplicationShutdown).toHaveBeenCalled();
   });
 
   it('should sort modules by distance (topological sort) - DESC order', async () => {
     @Injectable()
     class BB implements OnApplicationShutdown {
-      onApplicationShutdown = Sinon.spy();
+      onApplicationShutdown = vi.fn();
     }
 
     @Module({
@@ -35,7 +32,7 @@ describe('OnApplicationShutdown', () => {
     @Injectable()
     class AA implements OnApplicationShutdown {
       constructor(private bb: BB) {}
-      onApplicationShutdown = Sinon.spy();
+      onApplicationShutdown = vi.fn();
     }
     @Module({
       imports: [B],
@@ -53,6 +50,8 @@ describe('OnApplicationShutdown', () => {
 
     const aa = module.get(AA);
     const bb = module.get(BB);
-    Sinon.assert.callOrder(aa.onApplicationShutdown, bb.onApplicationShutdown);
+    expect(aa.onApplicationShutdown.mock.invocationCallOrder[0]).toBeLessThan(
+      bb.onApplicationShutdown.mock.invocationCallOrder[0],
+    );
   });
 });

integration/hooks/e2e/on-module-destroy.spec.ts

@@ -1,11 +1,8 @@
 import { Injectable, Module, OnModuleDestroy } from '@nestjs/common';
 import { Test } from '@nestjs/testing';
-import { expect } from 'chai';
-import * as Sinon from 'sinon';
-
 @Injectable()
 class TestInjectable implements OnModuleDestroy {
-  onModuleDestroy = Sinon.spy();
+  onModuleDestroy = vi.fn();
 }
 
 describe('OnModuleDestroy', () => {
@@ -17,7 +14,7 @@ describe('OnModuleDestroy', () => {
     const app = module.createNestApplication();
     await app.close();
     const instance = module.get(TestInjectable);
-    expect(instance.onModuleDestroy.called).to.be.true;
+    expect(instance.onModuleDestroy).toHaveBeenCalled();
   });
 
   it('should not throw an error when onModuleDestroy is null', async () => {
@@ -26,7 +23,8 @@ describe('OnModuleDestroy', () => {
     }).compile();
 
     const app = module.createNestApplication();
-    await app.init().then(obj => expect(obj).to.not.be.undefined);
+    await app.init().then(obj => expect(obj).not.toBeUndefined());
+    await app.close();
   });
 
   it('should not throw an error when onModuleDestroy is undefined', async () => {
@@ -37,13 +35,14 @@ describe('OnModuleDestroy', () => {
     }).compile();
 
     const app = module.createNestApplication();
-    await app.init().then(obj => expect(obj).to.not.be.undefined);
+    await app.init().then(obj => expect(obj).not.toBeUndefined());
+    await app.close();
   });
 
   it('should sort modules by distance (topological sort) - DESC order', async () => {
     @Injectable()
     class BB implements OnModuleDestroy {
-      onModuleDestroy = Sinon.spy();
+      onModuleDestroy = vi.fn();
     }
 
     @Module({
@@ -55,7 +54,7 @@ describe('OnModuleDestroy', () => {
     @Injectable()
     class AA implements OnModuleDestroy {
       constructor(private bb: BB) {}
-      onModuleDestroy = Sinon.spy();
+      onModuleDestroy = vi.fn();
     }
 
     @Module({
@@ -74,6 +73,8 @@ describe('OnModuleDestroy', () => {
 
     const aa = module.get(AA);
     const bb = module.get(BB);
-    Sinon.assert.callOrder(aa.onModuleDestroy, bb.onModuleDestroy);
+    expect(aa.onModuleDestroy.mock.invocationCallOrder[0]).toBeLessThan(
+      bb.onModuleDestroy.mock.invocationCallOrder[0],
+    );
   });
 });

integration/hooks/e2e/on-module-init.spec.ts

@@ -1,11 +1,8 @@
 import { Injectable, Module, OnModuleInit } from '@nestjs/common';
 import { Test } from '@nestjs/testing';
-import { expect } from 'chai';
-import * as Sinon from 'sinon';
-
 @Injectable()
 class TestInjectable implements OnModuleInit {
-  onModuleInit = Sinon.spy();
+  onModuleInit = vi.fn();
 }
 
 describe('OnModuleInit', () => {
@@ -17,7 +14,8 @@ describe('OnModuleInit', () => {
     const app = module.createNestApplication();
     await app.init();
     const instance = module.get(TestInjectable);
-    expect(instance.onModuleInit.called).to.be.true;
+    expect(instance.onModuleInit).toHaveBeenCalled();
+    await app.close();
   });
 
   it('should not throw an error when onModuleInit is null', async () => {
@@ -26,7 +24,8 @@ describe('OnModuleInit', () => {
     }).compile();
 
     const app = module.createNestApplication();
-    await app.init().then(obj => expect(obj).to.not.be.undefined);
+    await app.init().then(obj => expect(obj).not.toBeUndefined());
+    await app.close();
   });
 
   it('should not throw an error when onModuleInit is undefined', async () => {
@@ -35,7 +34,8 @@ describe('OnModuleInit', () => {
     }).compile();
 
     const app = module.createNestApplication();
-    await app.init().then(obj => expect(obj).to.not.be.undefined);
+    await app.init().then(obj => expect(obj).not.toBeUndefined());
+    await app.close();
   });
 
   it('should sort modules by distance (topological sort) - DESC order', async () => {
@@ -109,6 +109,7 @@ describe('OnModuleInit', () => {
     await app.init();
 
     const instance = module.get(AA);
-    expect(instance.field).to.equal('c-field_b-field_a-field');
+    expect(instance.field).toBe('c-field_b-field_a-field');
+    await app.close();
   });
 });

integration/hooks/tsconfig.json

@@ -1,13 +1,15 @@
 {
   "compilerOptions": {
+    "types": ["vitest/globals"],
     "module": "commonjs",
     "declaration": false,
     "noImplicitAny": false,
     "removeComments": true,
     "noLib": false,
+    "esModuleInterop": true,
     "emitDecoratorMetadata": true,
     "experimentalDecorators": true,
-    "target": "ES2021",
+    "target": "ES2023",
     "sourceMap": true,
     "allowJs": true,
     "strictNullChecks": true,

integration/injector/e2e/circular-custom-providers.spec.ts

@@ -1,5 +1,4 @@
 import { Test } from '@nestjs/testing';
-import { expect } from 'chai';
 
 import { Controller, Injectable, Module } from '@nestjs/common';
 
@@ -29,35 +28,23 @@ export class AppModule {}
 
 describe('Circular custom providers', () => {
   it('should throw an exception (useClass + regular provider)', async () => {
-    try {
-      const builder = Test.createTestingModule({
-        imports: [AppModule],
-      });
-      await builder.compile();
-
-      expect(true).to.be.eql(false);
-    } catch (err) {
-      expect(err.message).to.be.eql(
-        'A circular dependency has been detected inside "A". Please, make sure that each side of a bidirectional relationships are decorated with "forwardRef()". Note that circular relationships between custom providers (e.g., factories) are not supported since functions cannot be called more than once.',
-      );
-    }
+    const builder = Test.createTestingModule({
+      imports: [AppModule],
+    });
+    await expect(builder.compile()).rejects.toThrow(
+      'A circular dependency has been detected inside "A". Please, make sure that each side of a bidirectional relationships are decorated with "forwardRef()". Note that circular relationships between custom providers (e.g., factories) are not supported since functions cannot be called more than once.',
+    );
   });
 
   it('should throw an exception (2 factories)', async () => {
-    try {
-      const builder = Test.createTestingModule({
-        providers: [
-          { provide: 'ABC', useFactory: () => ({}), inject: ['DEF'] },
-          { provide: 'DEF', useFactory: () => ({}), inject: ['ABC'] },
-        ],
-      });
-      await builder.compile();
-
-      expect(true).to.be.eql(false);
-    } catch (err) {
-      expect(err.message).to.be.eql(
-        'A circular dependency has been detected inside "ABC". Please, make sure that each side of a bidirectional relationships are decorated with "forwardRef()". Note that circular relationships between custom providers (e.g., factories) are not supported since functions cannot be called more than once.',
-      );
-    }
+    const builder = Test.createTestingModule({
+      providers: [
+        { provide: 'ABC', useFactory: () => ({}), inject: ['DEF'] },
+        { provide: 'DEF', useFactory: () => ({}), inject: ['ABC'] },
+      ],
+    });
+    await expect(builder.compile()).rejects.toThrow(
+      'A circular dependency has been detected inside "ABC"',
+    );
   });
 });

integration/injector/e2e/circular-modules.spec.ts

@@ -1,9 +1,8 @@
 import { Test } from '@nestjs/testing';
-import { expect } from 'chai';
-import { CircularModule } from '../src/circular-modules/circular.module';
-import { CircularService } from '../src/circular-modules/circular.service';
-import { InputModule } from '../src/circular-modules/input.module';
-import { InputService } from '../src/circular-modules/input.service';
+import { CircularModule } from '../src/circular-modules/circular.module.js';
+import { CircularService } from '../src/circular-modules/circular.service.js';
+import { InputModule } from '../src/circular-modules/input.module.js';
+import { InputService } from '../src/circular-modules/input.service.js';
 
 describe('Circular dependency (modules)', () => {
   it('should resolve circular dependency between providers', async () => {
@@ -14,7 +13,7 @@ describe('Circular dependency (modules)', () => {
     const inputService = testingModule.get<InputService>(InputService);
     const circularService = testingModule.get<CircularService>(CircularService);
 
-    expect(inputService.service).to.be.eql(circularService);
-    expect(circularService.service).to.be.eql(inputService);
+    expect(inputService.service).toEqual(circularService);
+    expect(circularService.service).toEqual(inputService);
   });
 });

integration/injector/e2e/circular-property-injection.spec.ts

@@ -1,9 +1,8 @@
 import { Test } from '@nestjs/testing';
-import { expect } from 'chai';
-import { CircularPropertiesModule } from '../src/circular-properties/circular-properties.module';
-import { CircularService } from '../src/circular-properties/circular.service';
-import { InputPropertiesModule } from '../src/circular-properties/input-properties.module';
-import { InputService } from '../src/circular-properties/input.service';
+import { CircularPropertiesModule } from '../src/circular-properties/circular-properties.module.js';
+import { CircularService } from '../src/circular-properties/circular.service.js';
+import { InputPropertiesModule } from '../src/circular-properties/input-properties.module.js';
+import { InputService } from '../src/circular-properties/input.service.js';
 
 describe('Circular properties dependency (modules)', () => {
   it('should resolve circular dependency between providers', async () => {
@@ -14,7 +13,7 @@ describe('Circular properties dependency (modules)', () => {
     const inputService = testingModule.get<InputService>(InputService);
     const circularService = testingModule.get<CircularService>(CircularService);
 
-    expect(inputService.service).to.be.eql(circularService);
-    expect(circularService.service).to.be.eql(inputService);
+    expect(inputService.service).toEqual(circularService);
+    expect(circularService.service).toEqual(inputService);
   });
 });

integration/injector/e2e/circular-structure-dynamic-modules.spec.ts

@@ -1,7 +1,6 @@
-import { expect } from 'chai';
 import { Test } from '@nestjs/testing';
-import { CircularModule } from '../src/circular-structure-dynamic-module/circular.module';
-import { InputService } from '../src/circular-structure-dynamic-module/input.service';
+import { CircularModule } from '../src/circular-structure-dynamic-module/circular.module.js';
+import { InputService } from '../src/circular-structure-dynamic-module/input.service.js';
 
 describe('Circular structure for dynamic modules', () => {
   it('should resolve circular structure with dynamic modules', async () => {
@@ -11,6 +10,6 @@ describe('Circular structure for dynamic modules', () => {
     const testingModule = await builder.compile();
     const inputService = testingModule.get<InputService>(InputService);
 
-    expect(inputService).to.be.instanceof(InputService);
+    expect(inputService).toBeInstanceOf(InputService);
   });
 });

integration/injector/e2e/circular.spec.ts

@@ -1,8 +1,7 @@
 import { Test } from '@nestjs/testing';
-import { expect } from 'chai';
-import { CircularModule } from '../src/circular/circular.module';
-import { CircularService } from '../src/circular/circular.service';
-import { InputService } from '../src/circular/input.service';
+import { CircularModule } from '../src/circular/circular.module.js';
+import { CircularService } from '../src/circular/circular.service.js';
+import { InputService } from '../src/circular/input.service.js';
 
 describe('Circular dependency', () => {
   it('should resolve circular dependency between providers', async () => {
@@ -13,7 +12,7 @@ describe('Circular dependency', () => {
     const inputService = testingModule.get<InputService>(InputService);
     const circularService = testingModule.get<CircularService>(CircularService);
 
-    expect(inputService.service).to.be.eql(circularService);
-    expect(circularService.service).to.be.eql(inputService);
+    expect(inputService.service).toEqual(circularService);
+    expect(circularService.service).toEqual(inputService);
   });
 });

integration/injector/e2e/core-injectables.spec.ts

@@ -1,7 +1,6 @@
-import { Test, TestingModule } from '@nestjs/testing';
-import { expect } from 'chai';
-import { CoreInjectablesModule } from '../src/core-injectables/core-injectables.module';
 import { ApplicationConfig, ModuleRef } from '@nestjs/core';
+import { Test, TestingModule } from '@nestjs/testing';
+import { CoreInjectablesModule } from '../src/core-injectables/core-injectables.module.js';
 
 describe('Core Injectables', () => {
   let testingModule: TestingModule;
@@ -13,26 +12,30 @@ describe('Core Injectables', () => {
     testingModule = await builder.compile();
   });
 
+  afterEach(async () => {
+    await testingModule.close();
+  });
+
   it('should provide ApplicationConfig as core injectable', () => {
     const applicationConfig =
       testingModule.get<ApplicationConfig>(ApplicationConfig);
 
     applicationConfig.setGlobalPrefix('/api');
 
-    expect(applicationConfig).to.not.be.undefined;
-    expect(applicationConfig.getGlobalPrefix()).to.be.eq('/api');
+    expect(applicationConfig).not.toBeUndefined();
+    expect(applicationConfig.getGlobalPrefix()).toBe('/api');
   });
 
   it('should provide ModuleRef as core injectable', () => {
     const moduleRef = testingModule.get<ModuleRef>(ModuleRef);
-    expect(moduleRef).to.not.be.undefined;
+    expect(moduleRef).not.toBeUndefined();
   });
 
   it('should provide the current Module as provider', () => {
     const module = testingModule.get<CoreInjectablesModule>(
       CoreInjectablesModule,
     );
-    expect(module).to.not.be.undefined;
-    expect(module.constructor.name).to.be.eq('CoreInjectablesModule');
+    expect(module).not.toBeUndefined();
+    expect(module.constructor.name).toBe('CoreInjectablesModule');
   });
 });

integration/injector/e2e/default-values.spec.ts

@@ -1,7 +1,6 @@
 import { Test } from '@nestjs/testing';
-import { expect } from 'chai';
-import { DefaultsModule } from '../src/defaults/defaults.module';
-import { DefaultsService } from '../src/defaults/defaults.service';
+import { DefaultsModule } from '../src/defaults/defaults.module.js';
+import { DefaultsService } from '../src/defaults/defaults.service.js';
 
 describe('Injector', () => {
   describe('when optional', () => {
@@ -10,7 +9,7 @@ describe('Injector', () => {
         imports: [DefaultsModule],
       });
       const app = await builder.compile();
-      expect(app.get(DefaultsService).coreService.default).to.be.true;
+      expect(app.get(DefaultsService).coreService.default).toBe(true);
     });
   });
 });

integration/injector/e2e/injector.spec.ts

@@ -1,36 +1,30 @@
-import { RuntimeException } from '@nestjs/core/errors/exceptions/runtime.exception';
-import { UnknownDependenciesException } from '@nestjs/core/errors/exceptions/unknown-dependencies.exception';
-import { UnknownExportException } from '@nestjs/core/errors/exceptions/unknown-export.exception';
+import { RuntimeException } from '@nestjs/core/errors/exceptions/runtime.exception.js';
+import { UnknownDependenciesException } from '@nestjs/core/errors/exceptions/unknown-dependencies.exception.js';
+import { UnknownExportException } from '@nestjs/core/errors/exceptions/unknown-export.exception.js';
 import { Test } from '@nestjs/testing';
-import { expect } from 'chai';
-import * as chai from 'chai';
-import * as chaiAsPromised from 'chai-as-promised';
 import {
   DYNAMIC_TOKEN,
   DYNAMIC_VALUE,
   NestDynamicModule,
-} from '../src/dynamic/dynamic.module';
-import { ExportsModule } from '../src/exports/exports.module';
-import { InjectModule } from '../src/inject/inject.module';
-import { InjectSameNameModule } from '../src/inject/inject-same-name.module';
+} from '../src/dynamic/dynamic.module.js';
+import { ExportsModule } from '../src/exports/exports.module.js';
+import { InjectSameNameModule } from '../src/inject/inject-same-name.module.js';
+import { InjectModule } from '../src/inject/inject.module.js';
 import {
-  SelfInjectionProviderModule,
-  SelfInjectionProviderCustomTokenModule,
   SelfInjectionForwardProviderModule,
-} from '../src/self-injection/self-injection-provider.module';
-chai.use(chaiAsPromised);
+  SelfInjectionProviderCustomTokenModule,
+  SelfInjectionProviderModule,
+} from '../src/self-injection/self-injection-provider.module.js';
 
 describe('Injector', () => {
   describe('when "providers" and "exports" properties are inconsistent', () => {
     it(`should fail with "UnknownExportException"`, async () => {
-      try {
-        const builder = Test.createTestingModule({
-          imports: [ExportsModule],
-        });
-        await builder.compile();
-      } catch (err) {
-        expect(err).to.be.instanceof(UnknownExportException);
-      }
+      const builder = Test.createTestingModule({
+        imports: [ExportsModule],
+      });
+      await expect(builder.compile()).rejects.toBeInstanceOf(
+        UnknownExportException,
+      );
     });
   });
 
@@ -40,20 +34,16 @@ describe('Injector', () => {
         imports: [InjectSameNameModule],
       });
 
-      await expect(builder.compile()).to.eventually.be.fulfilled;
+      await expect(builder.compile()).resolves.toBeDefined();
     });
   });
 
   describe('when Nest cannot resolve dependencies', () => {
     it(`should fail with "RuntimeException"`, async () => {
-      try {
-        const builder = Test.createTestingModule({
-          imports: [InjectModule],
-        });
-        await builder.compile();
-      } catch (err) {
-        expect(err).to.be.instanceof(RuntimeException);
-      }
+      const builder = Test.createTestingModule({
+        imports: [InjectModule],
+      });
+      await expect(builder.compile()).rejects.toBeInstanceOf(RuntimeException);
     });
 
     describe('due to self-injection providers', () => {
@@ -62,9 +52,7 @@ describe('Injector', () => {
           imports: [SelfInjectionProviderModule],
         });
 
-        await expect(
-          builder.compile(),
-        ).to.eventually.be.rejected.and.be.an.instanceOf(
+        await expect(builder.compile()).rejects.toBeInstanceOf(
           UnknownDependenciesException,
         );
       });
@@ -73,9 +61,7 @@ describe('Injector', () => {
           imports: [SelfInjectionForwardProviderModule],
         });
 
-        await expect(
-          builder.compile(),
-        ).to.eventually.be.rejected.and.be.an.instanceOf(
+        await expect(builder.compile()).rejects.toBeInstanceOf(
           UnknownDependenciesException,
         );
       });
@@ -84,9 +70,7 @@ describe('Injector', () => {
           imports: [SelfInjectionProviderCustomTokenModule],
         });
 
-        await expect(
-          builder.compile(),
-        ).to.eventually.be.rejected.and.be.an.instanceOf(
+        await expect(builder.compile()).rejects.toBeInstanceOf(
           UnknownDependenciesException,
         );
       });
@@ -99,7 +83,7 @@ describe('Injector', () => {
         imports: [NestDynamicModule.byObject()],
       });
       const app = await builder.compile();
-      expect(app.get(DYNAMIC_TOKEN)).to.be.eql(DYNAMIC_VALUE);
+      expect(app.get(DYNAMIC_TOKEN)).toEqual(DYNAMIC_VALUE);
     });
 
     it(`should return provider via token (exported by token)`, async () => {
@@ -107,7 +91,7 @@ describe('Injector', () => {
         imports: [NestDynamicModule.byName()],
       });
       const app = await builder.compile();
-      expect(app.get(DYNAMIC_TOKEN)).to.be.eql(DYNAMIC_VALUE);
+      expect(app.get(DYNAMIC_TOKEN)).toEqual(DYNAMIC_VALUE);
     });
   });
 });

integration/injector/e2e/introspection.spec.ts

@@ -1,10 +1,9 @@
 import { Scope } from '@nestjs/common';
 import { ModuleRef } from '@nestjs/core';
 import { Test, TestingModule } from '@nestjs/testing';
-import { expect } from 'chai';
-import { ScopedModule, STATIC_FACTORY } from '../src/scoped/scoped.module';
-import { ScopedService } from '../src/scoped/scoped.service';
-import { TransientService } from '../src/scoped/transient.service';
+import { ScopedModule, STATIC_FACTORY } from '../src/scoped/scoped.module.js';
+import { ScopedService } from '../src/scoped/scoped.service.js';
+import { TransientService } from '../src/scoped/transient.service.js';
 
 describe('Providers introspection', () => {
   let testingModule: TestingModule;
@@ -17,18 +16,22 @@ describe('Providers introspection', () => {
     moduleRef = testingModule.get(ModuleRef);
   });
 
+  afterEach(async () => {
+    await testingModule.close();
+  });
+
   it('should properly introspect a transient provider', async () => {
     const introspectionResult = moduleRef.introspect(TransientService);
-    expect(introspectionResult.scope).to.be.equal(Scope.TRANSIENT);
+    expect(introspectionResult.scope).toBe(Scope.TRANSIENT);
   });
 
   it('should properly introspect a singleton provider', async () => {
     const introspectionResult = moduleRef.introspect(STATIC_FACTORY);
-    expect(introspectionResult.scope).to.be.equal(Scope.DEFAULT);
+    expect(introspectionResult.scope).toBe(Scope.DEFAULT);
   });
 
   it('should properly introspect a request-scoped provider', async () => {
     const introspectionResult = moduleRef.introspect(ScopedService);
-    expect(introspectionResult.scope).to.be.equal(Scope.REQUEST);
+    expect(introspectionResult.scope).toBe(Scope.REQUEST);
   });
 });

integration/injector/e2e/many-global-modules.spec.ts

@@ -1,6 +1,4 @@
 import { Test } from '@nestjs/testing';
-import { expect } from 'chai';
-import * as sinon from 'sinon';
 import { Global, Inject, Injectable, Module, Scope } from '@nestjs/common';
 
 @Global()
@@ -64,11 +62,11 @@ export class Dependant {
   ) {}
 
   public checkDependencies() {
-    expect(this.transientProvider).to.be.instanceOf(TransientProvider);
-    expect(this.foreignTransientProvider).to.be.instanceOf(
+    expect(this.transientProvider).toBeInstanceOf(TransientProvider);
+    expect(this.foreignTransientProvider).toBeInstanceOf(
       ForeignTransientProvider,
     );
-    expect(this.requestProvider).to.be.instanceOf(RequestProvider);
+    expect(this.requestProvider).toBeInstanceOf(RequestProvider);
   }
 }
 
@@ -149,9 +147,9 @@ describe('Many global modules', () => {
     const moduleRef = await moduleBuilder.compile();
 
     const dependant = await moduleRef.resolve(Dependant);
-    const checkDependenciesSpy = sinon.spy(dependant, 'checkDependencies');
+    const checkDependenciesSpy = vi.spyOn(dependant, 'checkDependencies');
     dependant.checkDependencies();
 
-    expect(checkDependenciesSpy.called).to.be.true;
+    expect(checkDependenciesSpy).toHaveBeenCalled();
   });
 });

integration/injector/e2e/multiple-providers.spec.ts

@@ -1,6 +1,5 @@
 import { Test } from '@nestjs/testing';
-import { expect } from 'chai';
-import { MultipleProvidersModule } from '../src/multiple-providers/multiple-providers.module';
+import { MultipleProvidersModule } from '../src/multiple-providers/multiple-providers.module.js';
 
 describe('Multiple providers under the same token ("each" feature)', () => {
   describe('get()', () => {
@@ -20,7 +19,7 @@ describe('Multiple providers under the same token ("each" feature)', () => {
       // @ts-expect-error: make sure "multiProviderInstances" is string[] not string
       multiProviderInstances.charAt;
 
-      expect(multiProviderInstances).to.be.eql(['A', 'B', 'C']);
+      expect(multiProviderInstances).toEqual(['A', 'B', 'C']);
     });
   });
   describe('resolve()', () => {
@@ -41,7 +40,7 @@ describe('Multiple providers under the same token ("each" feature)', () => {
       // @ts-expect-error: make sure "multiProviderInstances" is string[] not string
       multiProviderInstances.charAt;
 
-      expect(multiProviderInstances).to.be.eql(['A', 'B', 'C']);
+      expect(multiProviderInstances).toEqual(['A', 'B', 'C']);
     });
 
     it('should return an array of default-scoped providers', async () => {
@@ -61,7 +60,7 @@ describe('Multiple providers under the same token ("each" feature)', () => {
       // @ts-expect-error: make sure "multiProviderInstances" is string[] not string
       multiProviderInstances.charAt;
 
-      expect(multiProviderInstances).to.be.eql(['A', 'B', 'C']);
+      expect(multiProviderInstances).toEqual(['A', 'B', 'C']);
     });
   });
 });

integration/injector/e2e/optional-factory-provider-dep.spec.ts

@@ -1,7 +1,6 @@
 import { Scope } from '@nestjs/common';
-import { UnknownDependenciesException } from '@nestjs/core/errors/exceptions/unknown-dependencies.exception';
+import { UnknownDependenciesException } from '@nestjs/core/errors/exceptions/unknown-dependencies.exception.js';
 import { Test } from '@nestjs/testing';
-import { expect } from 'chai';
 
 describe('Optional factory provider deps', () => {
   describe('when dependency is optional', () => {
@@ -20,7 +19,7 @@ describe('Optional factory provider deps', () => {
         }).compile();
 
         const factoryProvider = moduleRef.get('FACTORY');
-        expect(factoryProvider).to.equal('OPTIONAL_DEP_VALUE');
+        expect(factoryProvider).toBe('OPTIONAL_DEP_VALUE');
       });
     });
     describe('otherwise', () => {
@@ -37,7 +36,7 @@ describe('Optional factory provider deps', () => {
         }).compile();
 
         const factoryProvider = moduleRef.get('FACTORY');
-        expect(factoryProvider).to.equal(defaultValue);
+        expect(factoryProvider).toBe(defaultValue);
       });
       it('"undefined" should be injected into the factory function (scoped provider)', async () => {
         const MY_PROVIDER = 'MY_PROVIDER';
@@ -70,7 +69,7 @@ describe('Optional factory provider deps', () => {
           ],
         }).compile();
 
-        expect(await module.resolve(MY_PROVIDER)).to.deep.equal({
+        expect(await module.resolve(MY_PROVIDER)).toEqual({
           first: undefined,
           second: 'second',
         });
@@ -80,56 +79,44 @@ describe('Optional factory provider deps', () => {
   describe('otherwise', () => {
     describe('and dependency is not registered', () => {
       it('should error out', async () => {
-        try {
-          const builder = Test.createTestingModule({
-            providers: [
-              {
-                provide: 'FACTORY',
-                useFactory: () => 'RETURNED_VALUE',
-                inject: ['MISSING_DEP'],
-              },
-            ],
-          });
-          await builder.compile();
-        } catch (err) {
-          expect(err).to.be.instanceOf(UnknownDependenciesException);
-        }
+        const builder = Test.createTestingModule({
+          providers: [
+            {
+              provide: 'FACTORY',
+              useFactory: () => 'RETURNED_VALUE',
+              inject: ['MISSING_DEP'],
+            },
+          ],
+        });
+        await expect(builder.compile()).rejects.toBeInstanceOf(
+          UnknownDependenciesException,
+        );
       });
     });
   });
   describe('and dependency is registered but it cannot be instantiated', () => {
     it('should error out', async () => {
-      try {
-        const builder = Test.createTestingModule({
-          providers: [
-            {
-              provide: 'POSSIBLY_MISSING_DEP',
-              useFactory: () => null,
-              inject: ['MISSING_DEP'],
-            },
-            {
-              provide: 'FACTORY',
-              useFactory: () => 'RETURNED_VALUE',
-              inject: [{ token: 'POSSIBLY_MISSING_DEP', optional: false }],
-            },
-          ],
-        });
-        await builder.compile();
-      } catch (err) {
-        expect(err).to.be.instanceOf(UnknownDependenciesException);
-        expect(err.message).to
-          .equal(`Nest can't resolve dependencies of the POSSIBLY_MISSING_DEP (?). Please make sure that the argument "MISSING_DEP" at index [0] is available in the RootTestModule context.
-
-Potential solutions:
-- Is RootTestModule a valid NestJS module?
-- If "MISSING_DEP" is a provider, is it part of the current RootTestModule?
-- If "MISSING_DEP" is exported from a separate @Module, is that module imported within RootTestModule?
-  @Module({
-    imports: [ /* the Module containing "MISSING_DEP" */ ]
-  })
-
-For more common dependency resolution issues, see: https://docs.nestjs.com/faq/common-errors`);
-      }
+      const builder = Test.createTestingModule({
+        providers: [
+          {
+            provide: 'POSSIBLY_MISSING_DEP',
+            useFactory: () => null,
+            inject: ['MISSING_DEP'],
+          },
+          {
+            provide: 'FACTORY',
+            useFactory: () => 'RETURNED_VALUE',
+            inject: [{ token: 'POSSIBLY_MISSING_DEP', optional: false }],
+          },
+        ],
+      });
+      await expect(builder.compile()).rejects.toSatisfy((err: any) => {
+        expect(err).toBeInstanceOf(UnknownDependenciesException);
+        expect(err.message).toContain(
+          `Nest can't resolve dependencies of the POSSIBLY_MISSING_DEP (?)`,
+        );
+        return true;
+      });
     });
   });
 });

integration/injector/e2e/property-injection.spec.ts

@@ -1,9 +1,8 @@
+import { UnknownDependenciesException } from '@nestjs/core/errors/exceptions/unknown-dependencies.exception.js';
 import { Test } from '@nestjs/testing';
-import { expect } from 'chai';
-import { DependencyService } from '../src/properties/dependency.service';
-import { PropertiesModule } from '../src/properties/properties.module';
-import { PropertiesService } from '../src/properties/properties.service';
-import { UnknownDependenciesException } from '@nestjs/core/errors/exceptions/unknown-dependencies.exception';
+import { DependencyService } from '../src/properties/dependency.service.js';
+import { PropertiesModule } from '../src/properties/properties.module.js';
+import { PropertiesService } from '../src/properties/properties.service.js';
 
 describe('Injector', () => {
   it('should resolve property-based dependencies', async () => {
@@ -13,32 +12,25 @@ describe('Injector', () => {
     const app = await builder.compile();
     const dependency = app.get(DependencyService);
 
-    expect(app.get(PropertiesService).service).to.be.eql(dependency);
-    expect(app.get(PropertiesService).token).to.be.true;
-    expect(app.get(PropertiesService).symbolToken).to.be.true;
+    expect(app.get(PropertiesService).service).toEqual(dependency);
+    expect(app.get(PropertiesService).token).toBe(true);
+    expect(app.get(PropertiesService).symbolToken).toBe(true);
   });
 
   it('should throw UnknownDependenciesException when dependency is not met', async () => {
-    let exception;
-
-    try {
-      const builder = Test.createTestingModule({
-        providers: [
-          DependencyService,
-          PropertiesService,
-          {
-            provide: 'token',
-            useValue: true,
-          },
-          // symbol token is missing here
-        ],
-      });
-      const app = await builder.compile();
-      app.get(DependencyService);
-    } catch (e) {
-      exception = e;
-    }
-
-    expect(exception).to.be.instanceOf(UnknownDependenciesException);
+    const builder = Test.createTestingModule({
+      providers: [
+        DependencyService,
+        PropertiesService,
+        {
+          provide: 'token',
+          useValue: true,
+        },
+        // symbol token is missing here
+      ],
+    });
+    await expect(builder.compile()).rejects.toBeInstanceOf(
+      UnknownDependenciesException,
+    );
   });
 });