export declare const observeResponsiveLayout: ({ root, breakpoint, wasMobile, onChange, onEnterMobile, blockBreakpoint, onBlockChange, }: {
    root: HTMLElement | null;
    breakpoint: number;
    wasMobile: boolean;
    onChange: (isMobile: boolean) => void;
    onEnterMobile: () => void;
    blockBreakpoint?: number;
    onBlockChange?: (isShort: boolean) => void;
}) => (() => void);