Worklet: addModule() method

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

Syntax

js-nolint

addModule(moduleURL)
addModule(moduleURL, options)

Parameters

moduleURL
- : A {{jsxref("String")}} containing the URL of a JavaScript file with the module to add.
options {{optional_inline}}
- : An object with any of the following options:
  - credentials
    - : A {{domxref("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 {{domxref("Request.credentials")}}.

Return value

A {{jsxref("Promise")}} that resolves once the module from the given URL has been added. The promise doesn't return any value.

Exceptions

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

AbortError {{domxref("DOMException")}}
- : The specified script is invalid or could not be loaded.
SyntaxError {{domxref("DOMException")}}
- : The specified moduleURL is invalid.

Examples

AudioWorklet example

const audioCtx = new AudioContext();
const audioWorklet = audioCtx.audioWorklet;
audioWorklet.addModule("modules/bypassFilter.js", {
  credentials: "omit",
});

PaintWorklet example

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 {{cssxref("image/paint", "paint()")}} function can be used to include the image created by the worklet:

css

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