Handle sent response

src/specs/decorators/controller.spec.ts

@@ -1,7 +1,7 @@
 import tachijs, { ConfigSetter, controller, httpGet } from '../../index'
 import request from 'supertest'
-import { ErrorRequestHandler, RequestHandler } from 'express'
-import { reqParams } from '../../decorators'
+import { ErrorRequestHandler, RequestHandler, Response } from 'express'
+import { reqParams, handlerParam } from '../../decorators'
 
 describe('controller', () => {
   it('sets path to router', async () => {
@@ -143,4 +143,33 @@ describe('controller', () => {
       text: 'Hello, test'
     })
   })
+
+  it('does not send data if response is already sent', async () => {
+    // Given
+    function injectRes() {
+      return handlerParam((req, res) => res)
+    }
+    @controller('/:name', [], {
+      mergeParams: true
+    })
+    class HomeController {
+      @httpGet('/hello')
+      index(@injectRes() res: Response) {
+        res.send('Hello, test')
+        return 'Other thing'
+      }
+    }
+    const app = tachijs({
+      controllers: [HomeController]
+    })
+
+    // When
+    const response = await request(app).get('/test/hello')
+
+    // Then
+    expect(response).toMatchObject({
+      status: 200,
+      text: 'Hello, test'
+    })
+  })
 })

src/tachijs.ts

@@ -121,7 +121,9 @@ class TachiJSApp<C> {
           await result.execute(req, res, next)
           return
         }
-        res.send(result)
+        if (!res.finished) {
+          res.send(result)
+        }
         return
       } catch (error) {
         next(error)