export declare function getOffset(el: Element): {
    top: number;
    left: number;
};
export declare function matches(el: Element, selector: string): boolean;
export declare function isElementHidden(elem: HTMLElement): boolean;
export declare function isElementVisible(elem: HTMLElement): boolean;
export declare function extend<T extends Record<string, unknown>>(defaults: T, options: Partial<T>): T;
export declare function getClassStr(classes: string[]): string;
export declare function preventDefaultContextTap(): void;
export declare function setBooleanAttribute(element: Element, attribute: string, boolValue: boolean): void;
export declare function isIn({ x, y }: {
    x: number;
    y: number;
}, element: Element): boolean;
export declare function getDimensionsHidden(element: HTMLElement): DOMRect;
export declare function defineCustomElement(name: string, klass: CustomElementConstructor, extendsType: string): void;