export declare function ResizeHandler(target: HTMLElement | null, callback: ResizeObserverCallback, options?: ResizeObserverOptions): {
    observe: (target: HTMLElement | null, options?: ResizeObserverOptions | MutationObserverInit | undefined) => void;
    unobserve: (target: HTMLElement | null) => void;
    disconnect: () => void;
    takeRecords: () => never[];
} | ResizeObserver;
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