safetwitch/server/index.ts

import express, { Express, NextFunction, Request, Response } from 'express';
import dotenv from 'dotenv'
import history from 'connect-history-api-fallback'
import routes from './routes'

dotenv.config()

const app: Express = express();
const port = process.env.PORT

app.use(routes)
app.use(history())
app.use(express.static('../frontend/dist'))

// 404 handler
app.use((req, res) => {
  if (!res.headersSent) {
    res.status(404).send('404')
  }
});

// handle errors
app.use(errorHandler)

function errorHandler(err: Error, req: Request, res: Response, next: NextFunction) {
  if (res.headersSent) {
    return next(err)
  }
  res.status(500)
  res.send('error')
  console.log(err)
}

app.listen(port, () => {
  console.log('Server up')
})