Load styles/scripts synchronously (or asynchronously) via HTML 'preload'.
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Preload, then load CSS & JavaScript asynchronously.

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developed by ‹src.works/›

Harness the power of <link rel="preload"> in Chrome and other modern browsers. This library provides a useful set of utilities that can be used to preload styles and scripts, then load them in order, or just load them straight away — synchronously or asynchronously. To learn more, see: Preload: What Is It Good For? & Chop-Chop Docs.

Installation Options

Install via NPM package

$ npm install chop-chop --save;

Or install via Yarn Yarn package

$ yarn add chop-chop;

Or install via unpkg.com CDN CDN

<script src="https://unpkg.com/chop-chop@0.0.8" integrity="sha384-nihFIupLpAen2KgO9BtVN6LcFYEJ0FwRmh9waYwopvof5L0CX6rzF3ikQZSbdcp9" crossorigin="anonymous"></script>

Works in All Modern Browsers


If you need to support IE <= 11 (prior to Edge), older versions of Android, and much older versions of other browsers, you can insert this polyfill before all other script tags. The polyfill.io service fills ES6 features that a user's browser is lacking, based on both UA & feature detection.

<!-- Before ALL other script tags in your document. -->
<!-- Only needed if you want to support much older browsers. -->
<script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=es6&amp;flags=gated"></script>

Quick Example



    .then(function(urls) {
      console.log('Resources loaded in the order given: %o', urls);

More Examples / Documentation

Built with TypeScript/JavaScript, Babel, NodeJS, NPM, and Sass

Commercial Use


This software is created, documented and maintained by Jason Caldwell (@jaswrks) and a small team of talented developers at ‹src.works/›. It's open source, but if you use it commercially, please pay what you can.

Development Channels

Always use the latest stable version in production. If you want upcoming changes ahead of time use the @dev or @rc tag, but please do so at your own risk. The @dev and @rc tags are potentially unstable at various times throughout a development cycle, and therefore should not be used in production.

Channel NPM Tag Description SemVer GitHub
Hackers @dev Latest Bleeding Edge
Release Tag master (PRs)
Lab Rats @rc Next Release Candidate
upcoming semi-stable release
Release Tag releases
Everyone @latest Latest Stable Version
highly recommended
Release Tag releases

NPM Consumption Examples

Channel NPM Tag NPM package.json
Hackers @dev "chop-chop": "dev"
Lab Rats @rc "chop-chop": "rc"
Everyone @latest "chop-chop": "latest"
Latest Stable Version "chop-chop": "^0.0.8"
Channel NPM Tag NPM Install
Hackers @dev npm install chop-chop@dev
Lab Rats @rc npm install chop-chop@rc
Everyone @latest npm install chop-chop@latest
Latest Stable Version npm install chop-chop

CDN Directory Indexes

Channel NPM Tag CDN Distribution Index
Hackers @dev https://unpkg.com/chop-chop@dev/dist/
Lab Rats @rc https://unpkg.com/chop-chop@rc/dist/
Everyone @latest https://unpkg.com/chop-chop@latest/dist/
Latest Stable Version https://unpkg.com/chop-chop@0.0.8/dist/

CDN Script URLs

Channel NPM Tag CDN Script URL
Hackers @dev https://unpkg.com/chop-chop@dev
Lab Rats @rc https://unpkg.com/chop-chop@rc
Everyone @latest https://unpkg.com/chop-chop@latest
Latest Stable Version https://unpkg.com/chop-chop@0.0.8

CDN In production, use the latest stable version with an SRI integrity hash.

<script src="https://unpkg.com/chop-chop@0.0.8" integrity="sha384-nihFIupLpAen2KgO9BtVN6LcFYEJ0FwRmh9waYwopvof5L0CX6rzF3ikQZSbdcp9" crossorigin="anonymous"></script>

Tip: Don't use an SRI hash with a tag like @dev, @rc, or @latest. Tags reference a version dynamically; e.g., the @latest tag will point to an updated copy once the next version is released — rendering the SRI invalid. Instead, use a specific @x.x.x version in the URL.

MIT License

For full details see: LICENSE.txt


For full details see: CHANGELOG.md

Semantic Versioning

New versions are released following semver.org guidelines.

Pull Requests Welcome

fork the master branch at GitHub and submit your changes for review.

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