export declare function insertCSS(styleStr: string, styleId?: string): HTMLStyleElement;
export declare function findCSSNode(styleId: string): HTMLStyleElement | null;
export declare function updateCSS(styleStr: string, styleId: string): HTMLStyleElement | undefined;
export declare function updateCSSByStyle(style: HTMLStyleElement | undefined | null, styleStr: string, styleId: string): HTMLStyleElement | undefined;
export declare function removeCSS(styleId: string): void;