diff --git a/.prettierrc b/.prettierrc
index a20502b7f06..7cac555b0c5 100644
--- a/.prettierrc
+++ b/.prettierrc
@@ -1,4 +1,5 @@
 {
   "singleQuote": true,
+  "arrowParens": "avoid",
   "trailingComma": "all"
 }
diff --git a/integration/hello-world/e2e/exceptions.spec.ts b/integration/hello-world/e2e/exceptions.spec.ts
index 5fee5f701cd..7cf8223abd8 100644
--- a/integration/hello-world/e2e/exceptions.spec.ts
+++ b/integration/hello-world/e2e/exceptions.spec.ts
@@ -18,25 +18,19 @@ describe('Error messages', () => {
   });
 
   it(`/GET`, () => {
-    return request(server)
-      .get('/sync')
-      .expect(HttpStatus.BAD_REQUEST)
-      .expect({
-        statusCode: 400,
-        error: 'Bad Request',
-        message: 'Integration test',
-      });
+    return request(server).get('/sync').expect(HttpStatus.BAD_REQUEST).expect({
+      statusCode: 400,
+      error: 'Bad Request',
+      message: 'Integration test',
+    });
   });
 
   it(`/GET (Promise/async)`, () => {
-    return request(server)
-      .get('/async')
-      .expect(HttpStatus.BAD_REQUEST)
-      .expect({
-        statusCode: 400,
-        error: 'Bad Request',
-        message: 'Integration test',
-      });
+    return request(server).get('/async').expect(HttpStatus.BAD_REQUEST).expect({
+      statusCode: 400,
+      error: 'Bad Request',
+      message: 'Integration test',
+    });
   });
 
   afterEach(async () => {
diff --git a/integration/hello-world/e2e/exclude-middleware-fastify.spec.ts b/integration/hello-world/e2e/exclude-middleware-fastify.spec.ts
index b8507566b17..09a324dd78c 100644
--- a/integration/hello-world/e2e/exclude-middleware-fastify.spec.ts
+++ b/integration/hello-world/e2e/exclude-middleware-fastify.spec.ts
@@ -78,16 +78,11 @@ describe('Exclude middleware (fastify)', () => {
     ).createNestApplication<NestFastifyApplication>(new FastifyAdapter());
 
     await app.init();
-    await app
-      .getHttpAdapter()
-      .getInstance()
-      .ready();
+    await app.getHttpAdapter().getInstance().ready();
   });
 
   it(`should exclude "/test" endpoint`, () => {
-    return request(app.getHttpServer())
-      .get('/test')
-      .expect(200, RETURN_VALUE);
+    return request(app.getHttpServer()).get('/test').expect(200, RETURN_VALUE);
   });
 
   it(`should not exclude "/test2" endpoint`, () => {
diff --git a/integration/hello-world/e2e/exclude-middleware.spec.ts b/integration/hello-world/e2e/exclude-middleware.spec.ts
index c544bbc5760..0b0fe2d7413 100644
--- a/integration/hello-world/e2e/exclude-middleware.spec.ts
+++ b/integration/hello-world/e2e/exclude-middleware.spec.ts
@@ -77,9 +77,7 @@ describe('Exclude middleware', () => {
   });
 
   it(`should exclude "/test" endpoint`, () => {
-    return request(app.getHttpServer())
-      .get('/test')
-      .expect(200, RETURN_VALUE);
+    return request(app.getHttpServer()).get('/test').expect(200, RETURN_VALUE);
   });
 
   it(`should not exclude "/test2" endpoint`, () => {
diff --git a/integration/hello-world/e2e/express-instance.spec.ts b/integration/hello-world/e2e/express-instance.spec.ts
index 790d9305206..9774487a245 100644
--- a/integration/hello-world/e2e/express-instance.spec.ts
+++ b/integration/hello-world/e2e/express-instance.spec.ts
@@ -20,10 +20,7 @@ describe('Hello world (express instance)', () => {
   });
 
   it(`/GET`, () => {
-    return request(server)
-      .get('/hello')
-      .expect(200)
-      .expect('Hello world!');
+    return request(server).get('/hello').expect(200).expect('Hello world!');
   });
 
   it(`/GET (Promise/async)`, () => {
@@ -41,14 +38,11 @@ describe('Hello world (express instance)', () => {
   });
 
   it(`/GET { host: ":tenant.example.com" } not matched`, () => {
-    return request(server)
-      .get('/host')
-      .expect(404)
-      .expect({
-        statusCode: 404,
-        error: 'Not Found',
-        message: 'Cannot GET /host',
-      });
+    return request(server).get('/host').expect(404).expect({
+      statusCode: 404,
+      error: 'Not Found',
+      message: 'Cannot GET /host',
+    });
   });
 
   afterEach(async () => {
diff --git a/integration/hello-world/e2e/express-multiple.spec.ts b/integration/hello-world/e2e/express-multiple.spec.ts
index 62516e0185a..431e896b7d8 100644
--- a/integration/hello-world/e2e/express-multiple.spec.ts
+++ b/integration/hello-world/e2e/express-multiple.spec.ts
@@ -29,10 +29,7 @@ describe('Hello world (express instance with multiple applications)', () => {
   });
 
   it(`/GET`, () => {
-    return request(server)
-      .get('/hello')
-      .expect(200)
-      .expect('Hello world!');
+    return request(server).get('/hello').expect(200).expect('Hello world!');
   });
 
   it(`/GET (app2)`, () => {
diff --git a/integration/hello-world/e2e/guards.spec.ts b/integration/hello-world/e2e/guards.spec.ts
index 530ad923b66..08e372e0067 100644
--- a/integration/hello-world/e2e/guards.spec.ts
+++ b/integration/hello-world/e2e/guards.spec.ts
@@ -37,8 +37,6 @@ describe('Guards', () => {
     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);
   });
 });
diff --git a/integration/hello-world/e2e/interceptors.spec.ts b/integration/hello-world/e2e/interceptors.spec.ts
index 30d8ce57017..11222c51443 100644
--- a/integration/hello-world/e2e/interceptors.spec.ts
+++ b/integration/hello-world/e2e/interceptors.spec.ts
@@ -77,9 +77,7 @@ describe('Interceptors', () => {
     ).createNestApplication();
 
     await app.init();
-    return request(app.getHttpServer())
-      .get('/hello')
-      .expect(200, RETURN_VALUE);
+    return request(app.getHttpServer()).get('/hello').expect(200, RETURN_VALUE);
   });
 
   it(`should map response`, async () => {
diff --git a/integration/hello-world/e2e/local-pipes.spec.ts b/integration/hello-world/e2e/local-pipes.spec.ts
index bf403170ee1..5bc4a66d8cd 100644
--- a/integration/hello-world/e2e/local-pipes.spec.ts
+++ b/integration/hello-world/e2e/local-pipes.spec.ts
@@ -18,12 +18,9 @@ describe('Hello world (default adapter)', () => {
   });
 
   it(`host=example.com should execute locally injected pipe by HelloController`, () => {
-    return request(server)
-      .get('/hello/local-pipe/1')
-      .expect(200)
-      .expect({
-        id: '1',
-      });
+    return request(server).get('/hello/local-pipe/1').expect(200).expect({
+      id: '1',
+    });
   });
 
   it(`host=host.example.com should execute locally injected pipe by HostController`, () => {
@@ -39,14 +36,11 @@ describe('Hello world (default adapter)', () => {
   });
 
   it(`should return 404 for mismatched host`, () => {
-    return request(server)
-      .get('/host/local-pipe/1')
-      .expect(404)
-      .expect({
-        error: 'Not Found',
-        message: 'Cannot GET /host/local-pipe/1',
-        statusCode: 404,
-      });
+    return request(server).get('/host/local-pipe/1').expect(404).expect({
+      error: 'Not Found',
+      message: 'Cannot GET /host/local-pipe/1',
+      statusCode: 404,
+    });
   });
 
   afterEach(async () => {
diff --git a/integration/hello-world/e2e/middleware-class.spec.ts b/integration/hello-world/e2e/middleware-class.spec.ts
index 2ce8aade848..8a573990121 100644
--- a/integration/hello-world/e2e/middleware-class.spec.ts
+++ b/integration/hello-world/e2e/middleware-class.spec.ts
@@ -51,9 +51,7 @@ describe('Middleware (class)', () => {
   });
 
   it(`forRoutes(*)`, () => {
-    return request(app.getHttpServer())
-      .get('/hello')
-      .expect(200, RETURN_VALUE);
+    return request(app.getHttpServer()).get('/hello').expect(200, RETURN_VALUE);
   });
 
   afterEach(async () => {
diff --git a/integration/hello-world/e2e/middleware.spec.ts b/integration/hello-world/e2e/middleware.spec.ts
index baa2595f313..a7fc00fa67d 100644
--- a/integration/hello-world/e2e/middleware.spec.ts
+++ b/integration/hello-world/e2e/middleware.spec.ts
@@ -57,15 +57,11 @@ describe('Middleware', () => {
   });
 
   it(`forRoutes(*)`, () => {
-    return request(app.getHttpServer())
-      .get('/hello')
-      .expect(200, RETURN_VALUE);
+    return request(app.getHttpServer()).get('/hello').expect(200, RETURN_VALUE);
   });
 
   it(`forRoutes(TestController)`, () => {
-    return request(app.getHttpServer())
-      .get('/test')
-      .expect(200, SCOPED_VALUE);
+    return request(app.getHttpServer()).get('/test').expect(200, SCOPED_VALUE);
   });
 
   it(`forRoutes(tests/*)`, () => {
diff --git a/integration/microservices/e2e/broadcast-mqtt.spec.ts b/integration/microservices/e2e/broadcast-mqtt.spec.ts
index 496259fbb26..632fb19a930 100644
--- a/integration/microservices/e2e/broadcast-mqtt.spec.ts
+++ b/integration/microservices/e2e/broadcast-mqtt.spec.ts
@@ -33,9 +33,7 @@ describe('MQTT transport', () => {
   });
 
   it(`Broadcast (2 subscribers)`, () => {
-    return request(server)
-      .get('/broadcast')
-      .expect(200, '2');
+    return request(server).get('/broadcast').expect(200, '2');
   });
 
   afterEach(async () => {
diff --git a/integration/microservices/e2e/broadcast-nats.spec.ts b/integration/microservices/e2e/broadcast-nats.spec.ts
index 2570f928bcb..5c8e632c200 100644
--- a/integration/microservices/e2e/broadcast-nats.spec.ts
+++ b/integration/microservices/e2e/broadcast-nats.spec.ts
@@ -33,9 +33,7 @@ describe('NATS transport', () => {
   });
 
   it(`Broadcast (2 subscribers)`, () => {
-    return request(server)
-      .get('/broadcast')
-      .expect(200, '2');
+    return request(server).get('/broadcast').expect(200, '2');
   });
 
   afterEach(async () => {
diff --git a/integration/microservices/e2e/broadcast-redis.spec.ts b/integration/microservices/e2e/broadcast-redis.spec.ts
index 1a14e55296e..c4c40d9fa81 100644
--- a/integration/microservices/e2e/broadcast-redis.spec.ts
+++ b/integration/microservices/e2e/broadcast-redis.spec.ts
@@ -33,9 +33,7 @@ describe('REDIS transport', () => {
   });
 
   it(`Broadcast (2 subscribers)`, () => {
-    return request(server)
-      .get('/broadcast')
-      .expect(200, '2');
+    return request(server).get('/broadcast').expect(200, '2');
   });
 
   afterEach(async () => {
diff --git a/integration/microservices/e2e/orders-grpc.spec.ts b/integration/microservices/e2e/orders-grpc.spec.ts
index eeb1a52dada..e0171948352 100644
--- a/integration/microservices/e2e/orders-grpc.spec.ts
+++ b/integration/microservices/e2e/orders-grpc.spec.ts
@@ -129,11 +129,7 @@ describe('Advanced GRPC transport', () => {
     callHandler.on('error', (err: any) => {
       // We want to fail only on real errors while Cancellation error
       // is expected
-      if (
-        String(err)
-          .toLowerCase()
-          .indexOf('cancelled') === -1
-      ) {
+      if (String(err).toLowerCase().indexOf('cancelled') === -1) {
         fail('gRPC Stream error happened, error: ' + err);
       }
     });
@@ -165,11 +161,7 @@ describe('Advanced GRPC transport', () => {
     callHandler.on('error', (err: any) => {
       // We want to fail only on real errors while Cancellation error
       // is expected
-      if (
-        String(err)
-          .toLowerCase()
-          .indexOf('cancelled') === -1
-      ) {
+      if (String(err).toLowerCase().indexOf('cancelled') === -1) {
         fail('gRPC Stream error happened, error: ' + err);
       }
     });
diff --git a/integration/microservices/e2e/sum-grpc.spec.ts b/integration/microservices/e2e/sum-grpc.spec.ts
index 0f649bf80c8..14084b54ca3 100644
--- a/integration/microservices/e2e/sum-grpc.spec.ts
+++ b/integration/microservices/e2e/sum-grpc.spec.ts
@@ -63,11 +63,7 @@ describe('GRPC transport', () => {
     callHandler.on('error', (err: any) => {
       // We want to fail only on real errors while Cancellation error
       // is expected
-      if (
-        String(err)
-          .toLowerCase()
-          .indexOf('cancelled') === -1
-      ) {
+      if (String(err).toLowerCase().indexOf('cancelled') === -1) {
         fail('gRPC Stream error happened, error: ' + err);
       }
     });
@@ -89,11 +85,7 @@ describe('GRPC transport', () => {
     callHandler.on('error', (err: any) => {
       // We want to fail only on real errors while Cancellation error
       // is expected
-      if (
-        String(err)
-          .toLowerCase()
-          .indexOf('cancelled') === -1
-      ) {
+      if (String(err).toLowerCase().indexOf('cancelled') === -1) {
         fail('gRPC Stream error happened, error: ' + err);
       }
     });
diff --git a/integration/microservices/e2e/sum-kafka.spec.ts b/integration/microservices/e2e/sum-kafka.spec.ts
index 671d67c6e59..b98440e37a9 100644
--- a/integration/microservices/e2e/sum-kafka.spec.ts
+++ b/integration/microservices/e2e/sum-kafka.spec.ts
@@ -106,17 +106,11 @@ describe('Kafka transport', () => {
     user: newUser,
   };
   it(`/POST (sync command create user)`, () => {
-    return request(server)
-      .post('/user')
-      .send(userDto)
-      .expect(200);
+    return request(server).post('/user').send(userDto).expect(200);
   });
 
   it(`/POST (sync command create business`, () => {
-    return request(server)
-      .post('/business')
-      .send(businessDto)
-      .expect(200);
+    return request(server).post('/business').send(businessDto).expect(200);
   });
 
   it(`/POST (sync command create user) Concurrency Test`, async () => {
@@ -124,12 +118,7 @@ describe('Kafka transport', () => {
     for (let concurrencyKey = 0; concurrencyKey < 100; concurrencyKey++) {
       const innerUserDto = JSON.parse(JSON.stringify(userDto));
       innerUserDto.name += `+${concurrencyKey}`;
-      promises.push(
-        request(server)
-          .post('/user')
-          .send(userDto)
-          .expect(200),
-      );
+      promises.push(request(server).post('/user').send(userDto).expect(200));
     }
     await Promise.all(promises);
   });
diff --git a/integration/microservices/e2e/sum-mqtt.spec.ts b/integration/microservices/e2e/sum-mqtt.spec.ts
index dd02be32026..0c305664084 100644
--- a/integration/microservices/e2e/sum-mqtt.spec.ts
+++ b/integration/microservices/e2e/sum-mqtt.spec.ts
@@ -49,7 +49,7 @@ describe('MQTT transport', () => {
       .expect(200, '15');
   });
 
-  it(`/POST (concurrent)`, function() {
+  it(`/POST (concurrent)`, function () {
     return request(server)
       .post('/concurrent')
       .send([
diff --git a/integration/microservices/e2e/sum-nats.spec.ts b/integration/microservices/e2e/sum-nats.spec.ts
index 89452a953f0..eff4ce88ad4 100644
--- a/integration/microservices/e2e/sum-nats.spec.ts
+++ b/integration/microservices/e2e/sum-nats.spec.ts
@@ -75,12 +75,10 @@ describe('NATS transport', () => {
   });
 
   it(`/GET (exception)`, () => {
-    return request(server)
-      .get('/exception')
-      .expect(200, {
-        message: 'test',
-        status: 'error',
-      });
+    return request(server).get('/exception').expect(200, {
+      message: 'test',
+      status: 'error',
+    });
   });
 
   it(`/POST (event notification)`, done => {
diff --git a/integration/microservices/e2e/sum-redis.spec.ts b/integration/microservices/e2e/sum-redis.spec.ts
index c3e54b5862b..7f0bc8d1d62 100644
--- a/integration/microservices/e2e/sum-redis.spec.ts
+++ b/integration/microservices/e2e/sum-redis.spec.ts
@@ -49,7 +49,7 @@ describe('REDIS transport', () => {
       .expect(200, '15');
   });
 
-  it(`/POST (concurrent)`, function() {
+  it(`/POST (concurrent)`, function () {
     this.retries(10);
 
     return request(server)
diff --git a/integration/microservices/e2e/sum-rpc.spec.ts b/integration/microservices/e2e/sum-rpc.spec.ts
index a58cb69cec2..0bead64a8c5 100644
--- a/integration/microservices/e2e/sum-rpc.spec.ts
+++ b/integration/microservices/e2e/sum-rpc.spec.ts
@@ -76,9 +76,7 @@ describe('RPC transport', () => {
   });
 
   it(`/POST (pattern not found)`, () => {
-    return request(server)
-      .post('/?command=test')
-      .expect(500);
+    return request(server).post('/?command=test').expect(500);
   });
 
   it(`/POST (event notification)`, done => {
diff --git a/integration/websockets/e2e/ws-gateway.spec.ts b/integration/websockets/e2e/ws-gateway.spec.ts
index f44a53ae382..1980998c638 100644
--- a/integration/websockets/e2e/ws-gateway.spec.ts
+++ b/integration/websockets/e2e/ws-gateway.spec.ts
@@ -65,7 +65,7 @@ describe('WebSocketGateway (WsAdapter)', () => {
     );
   });
 
-  it(`should support 2 different gateways`, async function() {
+  it(`should support 2 different gateways`, async function () {
     this.retries(10);
 
     app = await createNestApp(ApplicationGateway, CoreGateway);
diff --git a/packages/core/errors/exceptions/unknown-element.exception.ts b/packages/core/errors/exceptions/unknown-element.exception.ts
index 0a7c83c60a5..09c82e8f05e 100644
--- a/packages/core/errors/exceptions/unknown-element.exception.ts
+++ b/packages/core/errors/exceptions/unknown-element.exception.ts
@@ -3,8 +3,9 @@ import { RuntimeException } from './runtime.exception';
 export class UnknownElementException extends RuntimeException {
   constructor(name?: string) {
     super(
-      `Nest could not find ${name ||
-        'given'} element (this provider does not exist in the current context)`,
+      `Nest could not find ${
+        name || 'given'
+      } element (this provider does not exist in the current context)`,
     );
   }
 }
diff --git a/packages/core/errors/messages.ts b/packages/core/errors/messages.ts
index fb5d71a8c3b..9ed3a17dd5e 100644
--- a/packages/core/errors/messages.ts
+++ b/packages/core/errors/messages.ts
@@ -109,8 +109,9 @@ export const INVALID_CLASS_SCOPE_MESSAGE = (
   text: TemplateStringsArray,
   name: string | undefined,
 ) =>
-  `${name ||
-    'This class'} is marked as a scoped provider. Request and transient-scoped providers can't be used in combination with "get()" method. Please, use "resolve()" instead.`;
+  `${
+    name || 'This class'
+  } is marked as a scoped provider. Request and transient-scoped providers can't be used in combination with "get()" method. Please, use "resolve()" instead.`;
 
 export const INVALID_MIDDLEWARE_CONFIGURATION = `An invalid middleware configuration has been passed inside the module 'configure()' method.`;
 export const UNKNOWN_REQUEST_MAPPING = `An invalid controller has been detected. Perhaps, one of your controllers is missing @Controller() decorator.`;
diff --git a/packages/core/nest-application-context.ts b/packages/core/nest-application-context.ts
index d3370551f45..03d666a176d 100644
--- a/packages/core/nest-application-context.ts
+++ b/packages/core/nest-application-context.ts
@@ -138,12 +138,7 @@ export class NestApplicationContext implements INestApplicationContext {
     }
 
     signals = signals
-      .map((signal: string) =>
-        signal
-          .toString()
-          .toUpperCase()
-          .trim(),
-      )
+      .map((signal: string) => signal.toString().toUpperCase().trim())
       // filter out the signals which is already listening to
       .filter(signal => !this.activeShutdownSignals.includes(signal));
 
diff --git a/packages/core/scanner.ts b/packages/core/scanner.ts
index c1c582157a4..db8f16250fb 100644
--- a/packages/core/scanner.ts
+++ b/packages/core/scanner.ts
@@ -313,7 +313,9 @@ export class DependenciesScanner {
     if (!providersKeys.includes(type as string)) {
       return this.container.addProvider(provider as any, token);
     }
-    const providerToken = `${type as string} (UUID: ${randomStringGenerator()})`;
+    const providerToken = `${
+      type as string
+    } (UUID: ${randomStringGenerator()})`;
 
     let scope = (provider as ClassProvider | FactoryProvider).scope;
     if (isNil(scope) && (provider as ClassProvider).useClass) {
diff --git a/packages/microservices/server/server-grpc.ts b/packages/microservices/server/server-grpc.ts
index ce25a8e84c4..64ba6676b2b 100644
--- a/packages/microservices/server/server-grpc.ts
+++ b/packages/microservices/server/server-grpc.ts
@@ -240,9 +240,7 @@ export class ServerGrpc extends Server implements CustomTransportStrategy {
       call.on('data', (m: any) => req.next(m));
       call.on('error', (e: any) => {
         // Check if error means that stream ended on other end
-        const isCancelledError = String(e)
-          .toLowerCase()
-          .indexOf('cancelled');
+        const isCancelledError = String(e).toLowerCase().indexOf('cancelled');
 
         if (isCancelledError) {
           call.end();
diff --git a/packages/microservices/test/client/client-proxy.spec.ts b/packages/microservices/test/client/client-proxy.spec.ts
index 61b2ed7a159..6ebd0968a44 100644
--- a/packages/microservices/test/client/client-proxy.spec.ts
+++ b/packages/microservices/test/client/client-proxy.spec.ts
@@ -16,7 +16,7 @@ class TestClientProxy extends ClientProxy {
   public async close() {}
 }
 
-describe('ClientProxy', function() {
+describe('ClientProxy', function () {
   this.retries(10);
 
   let client: TestClientProxy;
diff --git a/packages/microservices/test/client/client-rmq.spec.ts b/packages/microservices/test/client/client-rmq.spec.ts
index d0f93ff6a42..e49036c3bce 100644
--- a/packages/microservices/test/client/client-rmq.spec.ts
+++ b/packages/microservices/test/client/client-rmq.spec.ts
@@ -4,7 +4,7 @@ import { empty } from 'rxjs';
 import * as sinon from 'sinon';
 import { ClientRMQ } from '../../client/client-rmq';
 
-describe('ClientRMQ', function() {
+describe('ClientRMQ', function () {
   this.retries(10);
 
   let client: ClientRMQ;
diff --git a/sample/01-cats-app/e2e/cats/cats.e2e-spec.ts b/sample/01-cats-app/e2e/cats/cats.e2e-spec.ts
index 4ebed219b30..7ec513b241e 100644
--- a/sample/01-cats-app/e2e/cats/cats.e2e-spec.ts
+++ b/sample/01-cats-app/e2e/cats/cats.e2e-spec.ts
@@ -23,12 +23,9 @@ describe('Cats', () => {
   });
 
   it(`/GET cats`, () => {
-    return request(app.getHttpServer())
-      .get('/cats')
-      .expect(200)
-      .expect({
-        data: catsService.findAll(),
-      });
+    return request(app.getHttpServer()).get('/cats').expect(200).expect({
+      data: catsService.findAll(),
+    });
   });
 
   afterAll(async () => {
diff --git a/sample/12-graphql-schema-first/src/common/directives/upper-case.directive.ts b/sample/12-graphql-schema-first/src/common/directives/upper-case.directive.ts
index 65133079604..62640c1ef9f 100644
--- a/sample/12-graphql-schema-first/src/common/directives/upper-case.directive.ts
+++ b/sample/12-graphql-schema-first/src/common/directives/upper-case.directive.ts
@@ -4,7 +4,7 @@ import { defaultFieldResolver, GraphQLField } from 'graphql';
 export class UpperCaseDirective extends SchemaDirectiveVisitor {
   visitFieldDefinition(field: GraphQLField<any, any>) {
     const { resolve = defaultFieldResolver } = field;
-    field.resolve = async function(...args) {
+    field.resolve = async function (...args) {
       const result = await resolve.apply(this, args);
       if (typeof result === 'string') {
         return result.toUpperCase();
diff --git a/sample/23-graphql-code-first/src/common/directives/upper-case.directive.ts b/sample/23-graphql-code-first/src/common/directives/upper-case.directive.ts
index 65133079604..62640c1ef9f 100644
--- a/sample/23-graphql-code-first/src/common/directives/upper-case.directive.ts
+++ b/sample/23-graphql-code-first/src/common/directives/upper-case.directive.ts
@@ -4,7 +4,7 @@ import { defaultFieldResolver, GraphQLField } from 'graphql';
 export class UpperCaseDirective extends SchemaDirectiveVisitor {
   visitFieldDefinition(field: GraphQLField<any, any>) {
     const { resolve = defaultFieldResolver } = field;
-    field.resolve = async function(...args) {
+    field.resolve = async function (...args) {
       const result = await resolve.apply(this, args);
       if (typeof result === 'string') {
         return result.toUpperCase();