The addModule() method of the Worklet interface loads the module in the given JavaScript file and adds it to the current Worklet.

moduleURL

A String containing the URL of a JavaScript file with the module to add.

options Optional

An object with any of the following options:

credentials

A Request.credentials value that indicates whether to send credentials (e.g. cookies and HTTP authentication) when loading the module. Can be one of "omit", "same-origin", or "include". Defaults to "same-origin". See also Request.credentials.

A Promise that resolves once the module from the given URL has been added. The promise doesn't return any value.

If addModule() fails, it rejects the promise, delivering one of the following errors to the rejection handler.

AbortError DOMException

The specified script is invalid or could not be loaded.

SyntaxError DOMException

The specified moduleURL is invalid.

CSS.paintWorklet.addModule(
  "https://mdn.github.io/houdini-examples/cssPaint/intro/worklets/hilite.js",
);

Once the script has been added to the paint worklet, the CSS paint() function can be used to include the image created by the worklet:

@supports (background-image: paint(id)) {
  h1 {
    background-image: paint(hollowHighlights, filled, 3px);
  }
}