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| type AnyFunction = (...args: any[]) => any | |
| function useEvent<T extends AnyFunction>(callback?: T) { | |
| const ref = useRef<AnyFunction | undefined>(() => { | |
| throw new Error("Cannot call an event handler while rendering.") | |
| }) | |
| useLayoutEffect(() => { | |
| ref.current = callback | |
| }) | |
| return useCallback<AnyFunction>( | |
| (...args) => ref.current?.apply(null, args), | |
| [] | |
| ) as T | |
| } | |
| // Usage | |
| function Component(props) { | |
| const [visible, setVisible] = useState(false) | |
| // props.onToggle may not be stable | |
| const onToggle = useEvent(props.onToggle) | |
| // But our onToggle is stable | |
| useEffect(() => onToggle(visible), [onToggle, visible]) | |
| // ❌ Throws when used in the render phase | |
| onToggle(visible) | |
| } |
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