colorful output from webpack to html stream

nodenodenode.js

'use strict';

const {spawn} = require('child_process');
const Convert = require('ansi-to-html');
const express = require('express');
const app = express();
const convert = new Convert({
    fg: '#000',
    newline: true,
    escapeXML: true
});

app.get('/', (req, res) => {
    const proc = spawn('npm', ['run', 'build:dev:int']);


    proc.stdout.on('data', (data) => {
        res.write(convert.toHtml(data.toString()));
    });

    proc.stderr.on('data', (data) => {
        res.write(`
            <span style="color: #ff0000;">
            ${convert.toHtml(data.toString())}
            </span>
        `);
    });

    proc.on('close', (code) => {
        res.write(code);
        res.end();
    });
});

app.listen(3000, () => console.log('Example app listening on port 3000!'));