| 1 | export interface Rect {
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| 2 | width: number;
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| 3 | height: number;
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| 4 | x?: number;
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| 5 | y?: number;
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| 6 | }
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| 7 | /**
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| 8 | * Efficiently observe size changes on an element. Depends on the `ResizeObserver` api,
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| 9 | * and polyfills are needed in older browsers.
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| 10 | *
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| 11 | * ```ts
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| 12 | * const [ref, attachRef] = useCallbackRef(null);
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| 13 | *
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| 14 | * const rect = useResizeObserver(ref);
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| 15 | *
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| 16 | * return (
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| 17 | * <div ref={attachRef}>
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| 18 | * {JSON.stringify(rect)}
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| 19 | * </div>
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| 20 | * )
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| 21 | * ```
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| 22 | *
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| 23 | * @param element The DOM element to observe
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| 24 | */
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| 25 | export default function useResizeObserver<TElement extends Element>(element: TElement | null | undefined): Rect | null;
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