change require() method to import for ES6,7 support

server/database.js

@@ -12,7 +12,7 @@ function printLog(data) {
   console.log(lines.join(''));
 }
 
-const spawn = require('child_process').spawn;
+import {spawn} from 'child_process';
 
 const prc = spawn('mongod', ['--config', '../database/mongod.cfg']);
 

server/https_server/https_server.js

@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-const fs = require('fs');
-const https = require('https');
+import fs from 'fs';
+import https from 'https';
 
 /**
  * Run https server

server/https_server/redirect_server.js

@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-const express = require('express');
-const http = require('http');
+import express from 'express';
+import http from 'http';
 
 /**
  * Redirect http to https

server/server.js

@@ -2,13 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-const express = require('express');
-const path = require('path');
-const bodyParser = require('body-parser');
+import express from 'express';
+import path from 'path';
+import bodyParser from 'body-parser';
 
-const config = require('./config');
-const httpsServer = require('./https_server/https_server');
-const redirectServer = require('./https_server/redirect_server');
+import config from './config';
+import httpsServer from './https_server/https_server';
+import redirectServer from './https_server/redirect_server';
 
 const app = express();