markdown-it/support/build_demo.mjs

#!/usr/bin/env node

import shell from 'shelljs';
import { readFileSync, writeFileSync } from 'fs';

function escape(input) {
  return input
    .replaceAll('&', '&')
    .replaceAll('<', '&lt;')
    .replaceAll('>', '&gt;')
    .replaceAll('"', '&quot;');
    //.replaceAll("'", '&#039;');
}

shell.rm('-rf', 'demo');
shell.mkdir('demo');

shell.cp('support/demo_template/README.md', 'demo/');
shell.cp('support/demo_template/index.css', 'demo/');

// Read html template and inject escaped sample
const html = readFileSync('support/demo_template/index.html', 'utf8');
const sample = readFileSync('support/demo_template/sample.md', 'utf8');

const output = html.replace('<!--SAMPLE-->', escape(sample));
writeFileSync('demo/index.html', output);

shell.exec('node_modules/.bin/rollup -c support/demo_template/rollup.config.mjs');