/**
 * Given a CSS string that will be loaded into a shadow root, split it into two parts:
 * - `documentCss`: CSS that needs to be applied to the document (like `@property`)
 * - `shadowCss`: CSS that needs to be applied to the shadow root
 * @param css
 */
export declare function splitShadowRootCss(css: string): {
    documentCss: string;
    shadowCss: string;
};