docs: update listen to use port env variable

Author: kamilmysliwiec

.prettierrc

@@ -1,4 +1,5 @@
 {
   "singleQuote": true,
-  "trailingComma": "all"
+  "trailingComma": "all",
+  "printWidth": 80
 }

content/devtools/ci-cd.md

@@ -40,7 +40,7 @@ async function bootstrap() {
 
     await app.close();
   } else {
-    await app.listen(3000);
+    await app.listen(process.env.PORT ?? 3000);
   }
 }
 ```
@@ -232,9 +232,7 @@ const publishOptions = {
   sha: process.env.CI_COMMIT_SHA,
   target: process.env.CI_MERGE_REQUEST_DIFF_BASE_SHA,
   trigger: process.env.CI_MERGE_REQUEST_DIFF_BASE_SHA ? 'pull' : 'push',
-  branch:
-    process.env.CI_COMMIT_BRANCH ??
-    process.env.CI_MERGE_REQUEST_SOURCE_BRANCH_NAME,
+  branch: process.env.CI_COMMIT_BRANCH ?? process.env.CI_MERGE_REQUEST_SOURCE_BRANCH_NAME,
 };
 ```
 

content/devtools/overview.md

@@ -9,7 +9,7 @@ async function bootstrap() {
   const app = await NestFactory.create(AppModule, {
     snapshot: true,
   });
-  await app.listen(3000);
+  await app.listen(process.env.PORT ?? 3000);
 }
 ```
 
@@ -185,7 +185,7 @@ This page comes in handy when you want to identify potential issues in your appl
 To save a serialized graph to a file, use the following code:
 
 ```typescript
-await app.listen(3000); // OR await app.init()
+await app.listen(process.env.PORT ?? 3000); // OR await app.init()
 fs.writeFileSync('./graph.json', app.get(SerializedGraph).toString());
 ```
 

content/exception-filters.md

@@ -141,7 +141,10 @@ Nest provides a set of standard exceptions that inherit from the base `HttpExcep
 All the built-in exceptions can also provide both an error `cause` and an error description using the `options` parameter:
 
 ```typescript
-throw new BadRequestException('Something bad happened', { cause: new Error(), description: 'Some error description' })
+throw new BadRequestException('Something bad happened', {
+  cause: new Error(),
+  description: 'Some error description',
+});
 ```
 
 Using the above, this is how the response would look:
@@ -150,7 +153,7 @@ Using the above, this is how the response would look:
 {
   "message": "Something bad happened",
   "error": "Some error description",
-  "statusCode": 400,
+  "statusCode": 400
 }
 ```
 
@@ -278,7 +281,7 @@ To create a global-scoped filter, you would do the following:
 async function bootstrap() {
   const app = await NestFactory.create(AppModule);
   app.useGlobalFilters(new HttpExceptionFilter());
-  await app.listen(3000);
+  await app.listen(process.env.PORT ?? 3000);
 }
 bootstrap();
 ```
@@ -394,7 +397,7 @@ async function bootstrap() {
   const { httpAdapter } = app.get(HttpAdapterHost);
   app.useGlobalFilters(new AllExceptionsFilter(httpAdapter));
 
-  await app.listen(3000);
+  await app.listen(process.env.PORT ?? 3000);
 }
 bootstrap();
 ```

content/faq/keep-alive-connections.md

@@ -18,7 +18,7 @@ async function bootstrap() {
   const app = await NestFactory.create(AppModule, {
     forceCloseConnections: true,
   });
-  await app.listen(3000);
+  await app.listen(process.env.PORT ?? 3000);
 }
 
 bootstrap();

content/faq/multiple-servers.md

@@ -10,7 +10,7 @@ const httpsOptions = {
 const app = await NestFactory.create(AppModule, {
   httpsOptions,
 });
-await app.listen(3000);
+await app.listen(process.env.PORT ?? 3000);
 ```
 
 If you use the `FastifyAdapter`, create the application as follows:
@@ -33,10 +33,7 @@ const httpsOptions = {
 };
 
 const server = express();
-const app = await NestFactory.create(
-  AppModule,
-  new ExpressAdapter(server),
-);
+const app = await NestFactory.create(AppModule, new ExpressAdapter(server));
 await app.init();
 
 const httpServer = http.createServer(server).listen(3000);
@@ -56,16 +53,17 @@ export class ShutdownObserver implements OnApplicationShutdown {
 
   public async onApplicationShutdown(): Promise<void> {
     await Promise.all(
-      this.httpServers.map((server) =>
-        new Promise((resolve, reject) => {
-          server.close((error) => {
-            if (error) {
-              reject(error);
-            } else {
-              resolve(null);
-            }
-          });
-        })
+      this.httpServers.map(
+        (server) =>
+          new Promise((resolve, reject) => {
+            server.close((error) => {
+              if (error) {
+                reject(error);
+              } else {
+                resolve(null);
+              }
+            });
+          }),
       ),
     );
   }

content/faq/raw-body.md

@@ -17,7 +17,7 @@ import { AppModule } from './app.module';
 const app = await NestFactory.create<NestExpressApplication>(AppModule, {
   rawBody: true,
 });
-await app.listen(3000);
+await app.listen(process.env.PORT ?? 3000);
 ```
 
 To access the raw request body in a controller, a convenience interface `RawBodyRequest` is provided to expose a `rawBody` field on the request: use the interface `RawBodyRequest` type:
@@ -77,7 +77,7 @@ const app = await NestFactory.create<NestFastifyApplication>(
     rawBody: true,
   },
 );
-await app.listen(3000);
+await app.listen(process.env.PORT ?? 3000);
 ```
 
 To access the raw request body in a controller, a convenience interface `RawBodyRequest` is provided to expose a `rawBody` field on the request: use the interface `RawBodyRequest` type:

content/faq/serverless.md

@@ -37,7 +37,7 @@ import { AppModule } from './app.module';
 
 async function bootstrap() {
   const app = await NestFactory.create(AppModule, { logger: ['error'] });
-  await app.listen(3000);
+  await app.listen(process.env.PORT ?? 3000);
 }
 bootstrap();
 

content/first-steps.md

@@ -56,7 +56,7 @@ import { AppModule } from './app.module';
 
 async function bootstrap() {
   const app = await NestFactory.create(AppModule);
-  await app.listen(3000);
+  await app.listen(process.env.PORT ?? 3000);
 }
 bootstrap();
 @@switch
@@ -65,7 +65,7 @@ import { AppModule } from './app.module';
 
 async function bootstrap() {
   const app = await NestFactory.create(AppModule);
-  await app.listen(3000);
+  await app.listen(process.env.PORT ?? 3000);
 }
 bootstrap();
 ```

content/fundamentals/lifecycle-events.md

@@ -84,7 +84,7 @@ async function bootstrap() {
   // Starts listening for shutdown hooks
   app.enableShutdownHooks();
 
-  await app.listen(3000);
+  await app.listen(process.env.PORT ?? 3000);
 }
 bootstrap();
 ```