/**
 * Get image data as data-string from a URL. This is useful for embedding images
 * inside of SVGs. Only JPEG and PNG images are supported.
 *
 * Note: This function uses `fetch` to get the image data. This means that using
 * it requires the `endowment:network-access` permission.
 *
 * @example
 * const imageData = await getImageData('https://cataas.com/cat');
 * const svg = `
 *   <svg width="100" height="100" xmlns="http://www.w3.org/2000/svg">
 *     <image href="${imageData}" />
 *   </svg>
 * `;
 *
 * @param url - The URL to get the image data from.
 * @param options - The options to use when fetching the image data. This is
 * passed directly to `fetch`.
 * @returns A promise that resolves to the image data as a data-string.
 */
export declare function getImageData(url: string, options?: RequestInit): Promise<string>;
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