daedalOS/scripts/minifyHtml.js

const { readdirSync, readFileSync, writeFileSync } = require("fs");
const { minify } = require("html-minifier-terser");
const { extname, join } = require("path");

const OUT_PATH = "out";

const HTML_MINIFIER_CONFIG = {
  collapseBooleanAttributes: true,
  collapseInlineTagWhitespace: true,
  collapseWhitespace: true,
  decodeEntities: true,
  includeAutoGeneratedTags: false,
  minifyJS: true,
  minifyURLs: true,
  processConditionalComments: true,
  processScripts: ["text/html"],
  removeAttributeQuotes: true,
  removeComments: true,
  removeEmptyAttributes: true,
  removeOptionalTags: true,
  removeRedundantAttributes: true,
  removeScriptTypeAttributes: true,
  removeStyleLinkTypeAttributes: true,
  sortAttributes: true,
  sortClassName: true,
  trimCustomFragments: true,
  useShortDoctype: true,
};

const CODE_REMOVE_FUNCTIONS = [
  (html) => html.replace(/<noscript (.*)><\/noscript>/, ""),
  (html) => html.replace(/<script (.*) nomodule=""><\/script>/, ""),
  (html) =>
    html.replace(/<style data-styled="" data-styled-version=(.*)>/, "<style>"),
];

readdirSync(OUT_PATH).forEach(async (entry) => {
  if (extname(entry) === ".html") {
    const filPath = join(OUT_PATH, entry);
    const html = await readFileSync(filPath);
    let minifiedHtml = await minify(html.toString(), HTML_MINIFIER_CONFIG);

    CODE_REMOVE_FUNCTIONS.forEach(
      (codeFunction) => (minifiedHtml = codeFunction(minifiedHtml))
    );

    await writeFileSync(filPath, minifiedHtml);
  }
});