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21 lines
366 B
TypeScript
21 lines
366 B
TypeScript
'use client'
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// based on https://github.com/Andarist/use-constant
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import { useRef } from 'react'
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type ResultBox<T> = { v: T }
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/**
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* React hook for creating a value exactly once
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*/
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export function useConstant<T>(fn: () => T): T {
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const ref = useRef<ResultBox<T>>({ v: fn() })
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if (!ref.current) {
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ref.current = { v: fn() }
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}
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return ref.current.v
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}
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