index.js

import * as fs from "fs/promises";
import * as Path from "path";
import * as Yaml from "js-yaml";
import { minify } from "html-minifier-terser";
import Handlebars from "handlebars";

const template = await fs.readFile(Path.resolve("index.html.hbs"), "utf-8");
const render = Handlebars.compile(template);
const options = {
    minifyJS: true,
    minifyCSS: true,
    removeComments: true,
    collapseWhitespace: true,
};

const files = await fs.readdir(".", { withFileTypes: true });
files.filter(entry => entry.isFile())
    .map(file => `${file.parentPath}/${file.name}`)
    .filter(path => path.endsWith(".yaml"))
    .forEach(async function (path) {
        const context = Yaml.load(await fs.readFile(path, "utf-8"));
        const outfile = Path.parse(`${path.slice(0, -5).replace(":", "/")}.html`);
        const content = await minify(render(context), options);
        await fs.mkdir(outfile.dir, { recursive: true });
        await fs.writeFile(Path.format(outfile), content);
    });