export declare class DataUtil {
    static store: Map<HTMLElement, Map<string, any>>;
    static set(instance: HTMLElement | undefined, key: string, data: any): void;
    static get(instance: HTMLElement, key: string): any | undefined;
    static remove(instance: HTMLElement, key: string): void;
    static has(instance: HTMLElement, key: string): boolean;
    static getAllInstancesByKey(key: string): any[];
}