Eric Bailey
28 lines
548 B
TypeScript
28 lines
548 B
TypeScript
import {useCallback, useRef} from 'react'
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type Cb = () => void
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export function callOnce() {
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let ran = false
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return function runCallbackOnce(cb: Cb) {
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if (ran) return
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ran = true
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cb()
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}
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}
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export function useCallOnce(cb: Cb): () => void
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export function useCallOnce(cb?: undefined): (cb: Cb) => void
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export function useCallOnce(cb?: Cb) {
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const ran = useRef(false)
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return useCallback(
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(icb: Cb) => {
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if (ran.current) return
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ran.current = true
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if (icb) icb()
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else if (cb) cb()
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},
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[cb],
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)
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}
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