server.js

// Imports
const express = require('express');
// const { Worker, workerData } = require("worker_threads");
const { Worker } = require('worker_threads');

// Basic settings
const app = express();
const port = 3000;

// Static routes
app.use(express.static('static'));

// Middleware
app.use(express.json({ limit: '10Mb' }));
app.use(function (req, res, next) {
  res.header('Access-Control-Allow-Origin', '*');
  res.header(
    'Access-Control-Allow-Headers',
    'Origin, X-Requested-With, Content-Type, Accept'
  );
  next();
});

// Send HTML files
app.get('/', (req, res) => res.sendFile('index.html'));

// APIs
app.post('/api/createSchedule', (req, res) => {
  // Deploy workers
  const myWorker = new Worker('./src/worker/scheduler.js', {
    workerData: req.body,
  });
  myWorker.on('message', (result) =>
    res.json({
      status: 'success',
      result,
    })
  );
  myWorker.on('error', (error) => {
    console.log(error);
    res.status(500).json({
      status: 'failed',
      result: [],
    });
  });
});

// Route everything else to the root
app.get('*', (req, res) => {
  res.redirect('/');
});

// listen to something
app.listen(port, () =>
  console.log(`Example app listening at http://localhost:${port}`)
);