Fix with-custom-reverse-proxy example (#5064)

Fixes #5052.

Example was using babel 6.

examples/with-custom-reverse-proxy/.babelrc

@@ -1,7 +1,5 @@
 {
   "presets": [
-    "next/babel",
-    "latest",
-    "stage-0"
+    "next/babel"
   ]
 }

examples/with-custom-reverse-proxy/package.json

@@ -8,9 +8,6 @@
     "react-dom": "16.2.0"
   },
   "devDependencies": {
-    "babel-preset-latest": "^6.24.1",
-    "babel-preset-stage-0": "^6.24.1",
-    "babel-register": "^6.24.1",
     "cross-env": "^5.0.1",
     "http-proxy-middleware": "^0.17.4"
   },

examples/with-custom-reverse-proxy/server.es6.js

@@ -1,50 +0,0 @@
-/* eslint-disable no-console */
-import express from 'express'
-import next from 'next'
-
-const devProxy = {
-  '/api': {
-    target: 'https://swapi.co/api/',
-    pathRewrite: {'^/api': '/'},
-    changeOrigin: true
-  }
-}
-
-const port = parseInt(process.env.PORT, 10) || 3000
-const env = process.env.NODE_ENV
-const dev = env !== 'production'
-const app = next({
-  dir: '.', // base directory where everything is, could move to src later
-  dev
-})
-
-const handle = app.getRequestHandler()
-
-let server
-app
-  .prepare()
-  .then(() => {
-    server = express()
-
-    // Set up the proxy.
-    if (dev && devProxy) {
-      const proxyMiddleware = require('http-proxy-middleware')
-      Object.keys(devProxy).forEach(function (context) {
-        server.use(proxyMiddleware(context, devProxy[context]))
-      })
-    }
-
-    // Default catch-all handler to allow Next.js to handle all other routes
-    server.all('*', (req, res) => handle(req, res))
-
-    server.listen(port, err => {
-      if (err) {
-        throw err
-      }
-      console.log(`> Ready on port ${port} [${env}]`)
-    })
-  })
-  .catch(err => {
-    console.log('An error occurred, unable to start the server')
-    console.log(err)
-  })

examples/with-custom-reverse-proxy/server.js

@@ -1,2 +1,50 @@
-require('babel-register')
-module.exports = require('./server.es6.js')
+/* eslint-disable no-console */
+const express = require('express')
+const next = require('next')
+
+const devProxy = {
+  '/api': {
+    target: 'https://swapi.co/api/',
+    pathRewrite: {'^/api': '/'},
+    changeOrigin: true
+  }
+}
+
+const port = parseInt(process.env.PORT, 10) || 3000
+const env = process.env.NODE_ENV
+const dev = env !== 'production'
+const app = next({
+  dir: '.', // base directory where everything is, could move to src later
+  dev
+})
+
+const handle = app.getRequestHandler()
+
+let server
+app
+  .prepare()
+  .then(() => {
+    server = express()
+
+    // Set up the proxy.
+    if (dev && devProxy) {
+      const proxyMiddleware = require('http-proxy-middleware')
+      Object.keys(devProxy).forEach(function (context) {
+        server.use(proxyMiddleware(context, devProxy[context]))
+      })
+    }
+
+    // Default catch-all handler to allow Next.js to handle all other routes
+    server.all('*', (req, res) => handle(req, res))
+
+    server.listen(port, err => {
+      if (err) {
+        throw err
+      }
+      console.log(`> Ready on port ${port} [${env}]`)
+    })
+  })
+  .catch(err => {
+    console.log('An error occurred, unable to start the server')
+    console.log(err)
+  })