/**
 * Add a PaintWorklet module to the CSS Paint API.
 *
 * @param targetWindow The target window to which the PaintWorklet module should be added.
 * @param baseUrl Base URL (e.g., https://cdn.example.com/paintworklets/)
 * @param fileName Name of the PaintWorklet file (e.g., "Flair.min.js")
 * @returns Promise that resolves when the module is added and throws when there is an error.
 */
export declare const addModule: (targetWindow: Window | undefined, baseUrl: string, fileName: string) => Promise<void>;