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@astrojs/ partytown

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This Astro integration enables Partytown in your Astro project.

Partytown is a lazy-loaded library to help relocate resource intensive scripts into a web worker, and off of the main thread.

If you’re using third-party scripts for things like analytics or ads, Partytown is a great way to make sure that they don’t slow down your site.

The Astro Partytown integration installs Partytown for you and makes sure it’s enabled on all of your pages.

Astro includes an astro add command to automate the setup of official integrations. If you prefer, you can install integrations manually instead.

Run one of the following commands in a new terminal window.

Terminal window
npx astro add partytown

If you run into any issues, feel free to report them to us on GitHub and try the manual installation steps below.

First, install the @astrojs/partytown package:

Terminal window
npm install @astrojs/partytown

Then, apply the integration to your astro.config.* file using the integrations property:

astro.config.mjs
import { defineConfig } from 'astro/config';
import partytown from '@astrojs/partytown';
export default defineConfig({
// ...
integrations: [partytown()],
});

Partytown should be ready to go with zero config. If you have an existing 3rd party script on your site, try adding the type="text/partytown" attribute:

<script type="text/partytown" src="fancy-analytics.js"></script>

If you open the “Network” tab from your browser’s dev tools, you should see the partytown proxy intercepting this request.

To configure this integration, pass a ‘config’ object to the partytown() function call in astro.config.mjs.

astro.config.mjs
export default defineConfig({
// ...
integrations: [
partytown({
config: {
// options go here
},
}),
],
});

This mirrors the Partytown config object.

Partytown ships with a debug mode; enable or disable it by passing true or false to config.debug. If debug mode is enabled, it will output detailed logs to the browser console.

If this option isn’t set, debug mode will be on by default in dev or preview mode.

astro.config.mjs
export default defineConfig({
// ...
integrations: [
partytown({
// Example: Disable debug mode.
config: { debug: false },
}),
],
});

Third-party scripts typically add variables to the window object so that you can communicate with them throughout your site. But when a script is loaded in a web-worker, it doesn’t have access to that global window object.

To solve this, Partytown can “patch” variables to the global window object and forward them to the appropriate script.

You can specify which variables to forward with the config.forward option. Read more in Partytown’s documentation.

astro.config.mjs
export default defineConfig({
// ...
integrations: [
partytown({
// Example: Add dataLayer.push as a forwarding-event.
config: {
forward: ['dataLayer.push'],
},
}),
],
});

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