| 1 | import { useReducer } from 'react';
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| 2 | /**
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| 3 | * Returns a function that triggers a component update. the hook equivalent to
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| 4 | * `this.forceUpdate()` in a class component. In most cases using a state value directly
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| 5 | * is preferable but may be required in some advanced usages of refs for interop or
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| 6 | * when direct DOM manipulation is required.
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| 7 | *
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| 8 | * ```ts
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| 9 | * const forceUpdate = useForceUpdate();
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| 10 | *
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| 11 | * const updateOnClick = useCallback(() => {
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| 12 | * forceUpdate()
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| 13 | * }, [forceUpdate])
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| 14 | *
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| 15 | * return <button type="button" onClick={updateOnClick}>Hi there</button>
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| 16 | * ```
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| 17 | */
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| 18 |
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| 19 | export default function useForceUpdate() {
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| 20 | // The toggling state value is designed to defeat React optimizations for skipping
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| 21 | // updates when they are stricting equal to the last state value
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| 22 | var _useReducer = useReducer(function (state) {
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| 23 | return !state;
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| 24 | }, false),
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| 25 | dispatch = _useReducer[1];
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| 26 |
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| 27 | return dispatch;
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| 28 | } |
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