In order to assist in the management of third-party JavaScript libraries, in the browser, Joystick includes a global joystick._external object where library instances can be tracked. This allows you to manage external libraries across components without having to implement complicated data patterns or inconveniently pass library instances around via props.

Tracking third-party libraries

To track a third-party library, you can utilize the joystick.external.track() method.


import joystick from '@joystick.js/ui';

const Index = joystick.component({
  lifecycle: {
    on_mount: () => {
      const stripe = stripe(joystick.settings.public.stripe.publishable_key);
      joystick.external.track('stripe', stripe);
  render: () => {
    return `<div></div>`;

export default Index;

joystick.external.track() takes two arguments: the name of the library you want to track and the data you want to track (e.g., a class instance or a configuration object). Once tracked, you will have global access to that library at window.joystick._external.<name> (e.g., window.joystick._external.stripe).

Retrieving a tracked dependency

While you can access window.joystick._external.<name> directly, for the sake of convenience, Joystick provides the joystick.external.get('<name>'). Usage of this is recommended for guaranteed backwards compatibility and consistency in your own code.

API Reference

Object API

external: {
  track: (library_name: string, value_to_track: any) => void,
  get: (library_name: string) => any,


  • track function

    A function that takes the name of a library to track as a string and an arbitrary value representing the library as any type.

  • get function

    A function that takes the name of a library to retrieve from window.joystick._external as a string.