export declare function querySelector<T>(selector: string | undefined, defaultElement: T): Element | T;
export declare function transitionEnd(handler: (e: TransitionEvent) => void, element: HTMLElement): void;
export declare function getParentWithClass(node: HTMLElement | null, className: string): HTMLElement | null;
export declare function childOf(parent: HTMLElement | null, node: HTMLElement | null): boolean;
export declare function childOfClass(node: HTMLElement | null, className: string): boolean;
export { default as observeIntersection } from './observerUtil';