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4.0.0-alpha.0 • Public • Published


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Orchastrates JS and CSS bundle creation in a highly efficient and configurable manner.

CAUTION The implementation currently produces a great deal backpressure. This can result in signficiant RAM usage. Projects dealing with a significant number resources are better off not using this tool until the custom stream source is implemented in v4.


npm install @userfrosting/gulp-bundle-assets --save-dev


// gulpfile.esm.js
import assetBundler from "@userfrosting/gulp-bundle-assets";
import { src, dest } from "gulp";
import cleanCss from "gulp-clean-css";
import concatCss from "gulp-concat-css";
import uglify from "gulp-uglify";
import concatJs from "gulp-concat-js";
export function bundle() {
    const config = {
        bundle: {
            example: {
                scripts: [
                styles: [
    const joiner = {
        Scripts(bundleStream, name) {
            return bundleStream
                .pipe(concatJs(name + ".js"))// example.js
        Styles(bundleStream, name) {
            return bundleStream
                .pipe(concatCss(name + ".css"))// example.css
                    compatibility: "ie10"
    return src("src/**")
        .pipe(assetBundler(config, joiner))
$ gulp bundle

Integrating bundles into your app

The Bundler class exposes a ResultsMap property containing a Map where the key is the bundle name and value the full path of the generated file. If any transform stream after Bundler that changes path names then the results map will no longer be accurate, so use the built in path transforms if possible.

This approach was decided on as it provides the most efficient means to integrate bundles with any system. No need to touch the file system until its absolutely necessary, and less work to optimise the output (e.g. make a php file out of it to reduce IO in production by maximising use of bytecode caching).


Generation of API documentation is not yet implemented however the API surface is fully documented interally. Use VS Code or look at the source on GitHub in the meantime.


This plugin was originally forked from gulp-bundle-assets to fix a CSS import bug.

It has since been entirely reworked to better suit the requirements of the UserFrosting's Sprinkle system and follow the Gulp plugin guidelines (namely not unncessarily depending on it). Though TypeScript is now the preferred language the output targetted to ES2015 and uses ES Modules (via the esm package) to ensure source it can be easily debugged if issues are observed in the wild.

This package was previously published under gulp-uf-bundle-assets and as of v3 is published under @userfrosting/gulp-bundle-assets to assist in longterm project management.

Release process

Generally speaking, all releases should first traverse through alpha, beta, and rc (release candidate) to catch missed bugs and gather feedback as appropriate. Aside from this however, there are a few steps that MUST always be done.

  1. Make sure is up to date.
  2. Update version via npm like npm version 3.0.0 or npm version patch.
  3. npm publish.
  4. Create release on GitHub from tag made by npm version.




npm i @userfrosting/gulp-bundle-assets

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