ha_permissions/ui/createHtml.js

import esbuild from "esbuild";
import htmlMinifier from "html-minifier-terser";
import fsSync from "fs";

const fs = fsSync.promises;

const esbuildProm = esbuild.build({
    entryPoints: [`./index.js`, `./index.css`],
    bundle: true,
    minify: true,
    sourcemap: false,
    write: false,
    outdir: `.`
});
const htmlProm = fs.readFile(`${import.meta.dirname}/index.html`, "utf-8");
const [build, html] = await Promise.all([esbuildProm, htmlProm]);

let js, css;
for(let i = 0; i < build.outputFiles.length; i++){
    if(build.outputFiles[i].path.endsWith(".js")){
        js = build.outputFiles[i].text;
    }else if(build.outputFiles[i].path.endsWith(".css")){
        css = build.outputFiles[i].text;
    }
}

let data = await htmlMinifier.minify(html, {
    collapseBooleanAttributes: true,
    collapseInlineTagWhitespace: true,
    collapseWhitespace: true,
    conservativeCollapse: true,
    decodeEntities: true,
    noNewlinesBeforeTagClose: true,
    removeComments: true
});

data = data.replace('<script></script>', `<script>${js}</script>`);
data = data.replace('<style></style>', `<style>${css}</style>`);

fs.writeFile(`${import.meta.dirname}/build.html`, data);