From 0efd6f9e6faad1b92723241654b601610e61236e Mon Sep 17 00:00:00 2001
From: Artem Samofalov <dex157@gmail.com>
Date: Mon, 30 Jan 2017 21:28:39 +0700
Subject: [PATCH] add pretty message if port already use(#927)

---
 bin/next-dev    | 6 +++++-
 server/index.js | 7 +++++--
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/bin/next-dev b/bin/next-dev
index 0df5f875292c5..3584aab3e92b9 100755
--- a/bin/next-dev
+++ b/bin/next-dev
@@ -61,6 +61,10 @@ srv.start(argv.port)
   }
 })
 .catch((err) => {
-  console.error(err)
+  if (err.code === 'EADDRINUSE') {
+    console.error(`Port ${argv.port} is already in use.\nUse \`npm run dev -- -p <some other port>\`.`)
+  } else {
+    console.error(err)
+  }
   process.exit(1)
 })
diff --git a/server/index.js b/server/index.js
index 494e4422b2bd5..129ca6c778015 100644
--- a/server/index.js
+++ b/server/index.js
@@ -119,10 +119,13 @@ export default class Server {
     await this.prepare()
     this.http = http.createServer(this.getRequestHandler())
     await new Promise((resolve, reject) => {
-      this.http.listen(port, (err) => {
-        if (err) return reject(err)
+      this.http.on('error', (error) => {
+        reject(error)
+      })
+      this.http.on('listening', () => {
         resolve()
       })
+      this.http.listen(port, () => {})
     })
   }