init env

src/app.js

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+import express from 'express';
+import path from 'path';
+
+import indexRouter from './routes/index';
+
+const app = express();
+
+app.use(express.json());
+app.use(express.urlencoded({extended: false}));
+app.use(express.static(path.join(__dirname, '../public')));
+
+app.use('/', indexRouter);
+
+export default app;

src/bin/www.js

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+#!/usr/bin/env node
+
+/**
+ * Module dependencies.
+ */
+
+import app from '../app';
+import debugLib from 'debug';
+import http from 'http';
+import {port} from '../config';
+
+const debug = debugLib('nodecdtheque:server');
+const server = http.createServer(app);
+
+server.listen(port);
+server.on('error', onError);
+server.on('listening', onListening);
+
+/**
+ * Event listener for HTTP server "error" event.
+ * @param {*} error
+ */
+function onError(error) {
+  if (error.syscall !== 'listen') {
+    throw error;
+  }
+
+  const bind = typeof port === 'string' ?
+    'Pipe ' + port :
+    'Port ' + port;
+
+  // handle specific listen errors with friendly messages
+  switch (error.code) {
+    case 'EACCES':
+      console.error(bind + ' requires elevated privileges');
+      process.exit(1);
+      break;
+    case 'EADDRINUSE':
+      console.error(bind + ' is already in use');
+      process.exit(1);
+      break;
+    default:
+      throw error;
+  }
+}
+
+/**
+ * Event listener for HTTP server "listening" event.
+ */
+function onListening() {
+  const addr = server.address();
+  const bind = typeof addr === 'string' ?
+    'pipe ' + addr :
+    'port ' + addr.port;
+  debug('Listening on ' + bind);
+}
+

src/config/index.js

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+module.exports = {
+  nodeEnv: process.env.NODE_ENV || 'development',
+  port: parseInt(process.env.PORT || '3001', 10),
+};

src/routes/index.js

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+import express from 'express';
+
+// eslint-disable-next-line new-cap
+const router = express.Router();
+
+/* GET home page. */
+router.get('/', function(req, res, next) {
+  res.render('index', {title: 'World'});
+});
+
+export default router;