build.js

const fs = require("fs");
const del = require("del");
const archiver = require("archiver");
const package_json = require("./package.json");

// create output stream
const output = fs.createWriteStream(__dirname + "/releases/extension_v" + package_json.version + ".zip");
// create new zip file
const archive = archiver("zip");

output.on("close", () => {
    console.log(archive.pointer() + " total bytes");
});
archive.on("error", err => {
    throw err;
});

// pipe all output into the writestream
archive.pipe(output);

// remove files we don't need/want
del(["extension/build/**/*.map", "extension/build/fonts/**"]).then(paths => {
    // add files from extension folder to the zip
    archive.glob("**/*", {
        cwd: "extension"
    });

    // finalize the zip file and write it
    archive.finalize();
});