Merge pull request #2430 from micalevisk/patch-2

docs(techniques): enhance `StreamableFile` code snippet

Author: kamilmysliwiec

content/techniques/streaming-files.md

@@ -46,23 +46,33 @@ export class FileController {
 }
 ```
 
-The default content type is `application/octet-stream`, if you need to customize the response you can use the `res.set` method.
+The default content type is `application/octet-stream`, if you need to customize the response you can use the `res.set` method or the [`@Header()`](/controllers#headers) decorator, like this:
 
 ```ts
-import { Controller, Get, StreamableFile, Response } from '@nestjs/common';
+import { Controller, Get, StreamableFile, Res } from '@nestjs/common';
 import { createReadStream } from 'fs';
 import { join } from 'path';
+import type { Response } from 'express';
 
 @Controller('file')
 export class FileController {
   @Get()
-  getFile(@Response({ passthrough: true }) res): StreamableFile {
+  getFile(@Res({ passthrough: true }) res: Response): StreamableFile {
     const file = createReadStream(join(process.cwd(), 'package.json'));
     res.set({
       'Content-Type': 'application/json',
       'Content-Disposition': 'attachment; filename="package.json"',
     });
     return new StreamableFile(file);
   }
+
+  // Or even:
+  @Get()
+  @Header('Content-Type', 'application/json')
+  @Header('Content-Disposition', 'attachment; filename="package.json"')
+  getStaticFile(): StreamableFile {
+    const file = createReadStream(join(process.cwd(), 'package.json'));
+    return new StreamableFile(file);
+  }  
 }
 ```