Created
November 4, 2020 13:45
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React: memolize async value custom hooks
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import { DependencyList, useEffect, useState } from "react"; | |
/** | |
* memolize async value custom hooks | |
* | |
* base: https://github.com/awmleer/use-async-memo | |
* | |
* usage1: const value = useAsyncMemo(async () => {}, [deps1, dep2, ...]); | |
* usage2: const value = useAsyncMemo(async () => {}, [deps1, dep2, ...], initialValue); | |
* | |
* @export | |
* @template T | |
* @param {(() => Promise<T> | undefined | null)} promiseFunc | |
* @param {DependencyList} deps | |
* @param {((() => T) | T)} [initialState] | |
* @returns {(T | (T | undefined))} | |
*/ | |
export default function useAsyncMemo<T>( | |
promiseFunc: () => Promise<T> | undefined | null, | |
deps: DependencyList, | |
initialState?: (() => T) | T | |
): T | (T | undefined) { | |
const [memoValue, setMemoValue] = useState<T | undefined>(initialState); | |
useEffect(() => { | |
let aborted = false; | |
const exec = async () => { | |
const value = await promiseFunc(); | |
// abort when canceled | |
if (aborted || !value) { | |
return; | |
} | |
setMemoValue(value); | |
}; | |
exec(); | |
return () => { | |
aborted = true; | |
}; | |
}, deps); | |
return memoValue; | |
} |
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