index.js

require('@babel/register')({
  "presets": [
    ["@babel/preset-env", {
      "targets": {
        "node": "current"
      }
    }],
    "@babel/preset-react"
  ],
  "plugins": [
    [
      "module-resolver",
      {
        "root": [
          "./"
        ],
        "alias": {}
      }
    ],
    "transform-promise-to-bluebird",
    "@babel/plugin-proposal-class-properties"
  ]
});

require.extensions['.css'] = () => {
  return;
};

var express = require('express');
var config = require('./config/config').default;

function registerGracefulShutdown(signal, server, id) {
  process.on(signal, function() {
    console.log(`Server(${id}) received signal ${signal}, attempt exit`);
    server.close(function() {
      console.log(`Server(${id}) finished closing, exiting`);
      process.exit(0);
    });
  });
}

function startThisProcess(app, id) {
  return new Promise(function(resolve, reject) {
    id = id || 'main';
    const server = app.listen(config.port, function() {
      console.log(`Server(${id}) listening on port ${config.port}`);
    });
    registerGracefulShutdown('SIGTERM', server, id);
    registerGracefulShutdown('SIGINT', server, id);
    resolve();
  });
}

var realapp = express();

var app = require('./app/app.js').default;

realapp.use("/portal",app);
realapp.use("/",app);

startThisProcess(realapp);