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09bb61e738
* perf: Radio Group usePrevious instead of useState * fix: only re-run if value changes * perf: put usePrevious custom Hook in _util/ref.ts * Generics instead of any * update
28 lines
605 B
TypeScript
28 lines
605 B
TypeScript
import * as React from 'react';
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export function fillRef<T>(ref: React.Ref<T>, node: T) {
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if (typeof ref === 'function') {
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ref(node);
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} else if (typeof ref === 'object' && ref && 'current' in ref) {
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(ref as any).current = node;
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}
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}
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export function composeRef<T>(...refs: React.Ref<T>[]): React.Ref<T> {
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return (node: T) => {
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refs.forEach(ref => {
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fillRef(ref, node);
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});
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};
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}
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export function usePrevious<T = undefined>(value: T): T | undefined {
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const ref = React.useRef<T>();
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React.useEffect(() => {
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ref.current = value;
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}, [value]);
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return ref.current;
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}
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