MUSE component for unified PayPal/Braintree web sdk

Usage no npm install needed!

<script type="module">
  import paypalMuseComponents from 'https://cdn.skypack.dev/@paypal/muse-components';


MUSE Component

MUSE component included in unified PayPal/Braintree client SDK.

Quick start

See src/index.js


npm test

Testing with different/multiple browsers

npm run karma -- --browser=Chrome
npm run karma -- --browser=Safari
npm run karma -- --browser=Firefox
npm run karma -- --browser=Chrome,Safari,Firefox

Keeping the browser open after tests

npm run karma -- --browser=Chrome --keep-open

Releasing and Publishing

  • Publish your code with a patch version:
npm run release
  • Or npm run release:patch, npm run release:minor, npm run release:major

Module structure

  • /src - any code which should be transpiled, published, and end up in production
  • /test - karma tests for everything in /src
  • __sdk__.js - metadata for compiling and bundling the final component


This module exports the public interface for the component.

export let LebowskiPay = {
    render(options) {

Then the integrating site can run:

paypal.LebowskiPay.render({ ... });


__sdk__.js defines any metadata which helps the sdk server compile and serve up the component.

export default {

     * Define the lebowski-pay component
     * Now developers can include paypal.com/sdk/js?components=lebowski-pay

    'lebowski-pay': {

         * Entry point. Everything exported from this module will be exported
         * in the `window.paypal` namespace.

        entry: './src/index',

         * Define a static namespace.
         * Server config will be available under the `__lebowski_pay__.serverConfig` global

        staticNamespace: '__lebowski_pay__',

         * Define configuration required by this module
         * - This should be in the form of a graphql query.
         * - The query will be merged with queries defined by other modules
         * - The final config will be passed as `__lebowski_pay__.serverConfig` in `./src/index` 

        configQuery: `
            fundingEligibility {
                card {


  • Why is there no webpack config, dist folder, or npm build command?

    This module (and modules like it) are not intended to be built as standalone components. It will be pulled in and compiled/bundled on the server-side, then combined with other modules.

  • When should I publish?

    When you publish, you're signing off on your changes being code-complete, fully tested, and ready for release. Publishing will not immediately trigger a deploy, but please only publish changes which are in a deployable state.

  • Can I define multiple components in one repo?

    Absolutely. __sdk__.js allows defining multiple entry points. These should generally represent different logical ui components, with separate concerns, and loose coupling. For example:

    modules: {
      'lebowski-pay': {
          entry: './src/components/lebowski-pay'
      'walter-pay': {
          entry: './src/components/walter-pay'
      'donnie-pay': {
          entry: './src/components/donnie-pay'

    Please bear in mind that this opens the door to any combination or permutation of these modules to be requested by the merchant -- hence the need for loose coupling. donnie-pay should never have a hard dependency on lebowski-pay being present.

  • Where is all of the karma, webpack, eslint, etc. config coming from?

    This module uses grumbler-scripts as a common source of configuration and defaults. Any of these can be overriden, either partially, or entirely, depending on the individual needs of the module. You'll notice .eslintrc.js, karma.conf.js, etc. are lightweight wrappers which only define module-specific overrides.