ESP3D/embedded/config/pack_favicon.js

const path = require("path");
const { createReadStream, createWriteStream } = require("fs");
const { createGzip } = require("zlib");
const faviconPath = path.normalize(__dirname + "/../assets/favicon.ico");

// Create a gzip function for reusable purpose
const compressFile = (filePath) => {
    const stream = createReadStream(filePath);
    stream
        .pipe(createGzip())
        .pipe(createWriteStream(`${filePath}.gz`))
        .on("finish", () =>
            console.log(`Successfully compressed the file at ${filePath}`)
        );
};
compressFile(faviconPath);