Mobx leaks memory on server side (#1550)

* Added server.js to configure useStaticRendering on start

* Update package to use server.js

* auto format with standard instead of prettier :( fixes broken test

examples/with-mobx/package.json

@@ -2,9 +2,9 @@
   "name": "with-mobx",
   "version": "1.0.0",
   "scripts": {
-    "dev": "next",
+    "dev": "node server.js",
     "build": "next build",
-    "start": "next start"
+    "start": "NODE_ENV=production node server.js"
   },
   "dependencies": {
     "mobx": "^2.7.0",

examples/with-mobx/server.js

@@ -0,0 +1,20 @@
+const dev = process.env.NODE_ENV !== 'production'
+
+const { createServer } = require('http')
+const { parse } = require('url')
+const next = require('next')
+const mobxReact = require('mobx-react')
+const app = next({ dev })
+const handle = app.getRequestHandler()
+
+mobxReact.useStaticRendering(true)
+
+app.prepare().then(() => {
+  createServer((req, res) => {
+    const parsedUrl = parse(req.url, true)
+    handle(req, res, parsedUrl)
+  }).listen(3000, err => {
+    if (err) throw err
+    console.log('> Ready on http://localhost:3000')
+  })
+})