spa-express-server.js

const express = require('express');
const morgan = require('morgan');
const path = require('path');

const PORT = process.env.PORT || 3000;

const app = express();

const logger = morgan(
  process.env.NODE_ENV !== 'production' ? 'dev' : 'combined',
);


app.use(logger);
app.use(express.static('build', { index: 'index.html' }));
app.get('*', (req, res) => {
  res.sendFile(path.join(__dirname, 'build', 'index.html'));
});

app.listen(PORT, err => {
  if (err) {
    // eslint-disable-next-line no-console
    console.log(`server failed to listen on port ${PORT}: ${err.code}`);
  } else {
    // eslint-disable-next-line no-console
    console.log(`server listening on port ${PORT}`);
  }
});