Update Firebase SDK's Script for Node.js

By Ron Royston

Originally Published 11/12/2018
Updated 11/12/2018


Run this Node script on your development machine to fetch and concatenate the Firebase code in to a single file.

Once you have all the Firebase client-side code in a single file on your development machine, it's easy to then concatenate your own minified Firebase app code to it. Finally, you have a single, minified script file to serve to your users.

Setup and Installation

This script requires the node-fetch package. To install this package, run the following command in the same terminal as you run firebase-tools from. This will install the development side package on your machine only.

npm install node-fetch --save-dev

Node Script

The script below is run from same terminal as you run firebase-tools from.

const fs = require('fs');
const fetch = require('node-fetch');
var version = process.argv[2];
var filePath = 'source/js/firebase.js';
var totalBytes = 0;
var promisesArray = [];
//const buf = Buffer.from();
var sdks = [
// Firebase App is always required and must be first
'https://www.gstatic.com/firebasejs/' + version + '/firebase-app.js',
// Add additional services that you want to use
'https://www.gstatic.com/firebasejs/' + version + '/firebase-auth.js',
'https://www.gstatic.com/firebasejs/' + version + '/firebase-database.js',
'https://www.gstatic.com/firebasejs/' + version + '/firebase-firestore.js',
'https://www.gstatic.com/firebasejs/' + version + '/firebase-messaging.js',
'https://www.gstatic.com/firebasejs/' + version + '/firebase-functions.js',
'https://www.gstatic.com/firebasejs/' + version + '/firebase-storage.js'

// delete existing local copy of SDK
fs.unlink(filePath, (err) => {
    if (err) {
    } else {

for (var sdk of sdks){

function update(){
    return Promise.all(promisesArray).then(async function (fetchResponses) {
        for (var res of fetchResponses){
            const dest = fs.createWriteStream(filePath,{flags:'a'});
            totalBytes += Number(res.headers.get('content-length'));
            await new Promise((resolve, reject) => {
                res.body.on("error", (err) => {
                dest.on("finish", function() {
        if(Math.round(totalBytes/1000) < 12){
            console.log('Warning. Saved ' + Math.round(totalBytes/1000) + ' kB. Double check that version exists');
        } else {
            console.log('Success. Saved ' + Math.round(totalBytes/1000) + ' kB.');


Run the Node script and pass the version as an argument. For example, node updateFirebase.js 5.5.9.


If you run into problems be sure you have installed the node-fetch module.

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