export declare function resolveUrl(url: string, baseUrl: string | null): string;
export declare function toArray<T>(arrayLike: CSSRuleList): T[];
export declare const isInstanceOfElement: <T extends {
    new (): Element;
    prototype: Element;
} | {
    new (): HTMLElement;
    prototype: HTMLElement;
} | {
    new (): SVGImageElement;
    prototype: SVGImageElement;
}>(node: Element | HTMLElement | SVGImageElement, instance: T) => node is T["prototype"];