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import { useMemo, useRef } from 'react';
import useMounted from './useMounted';
import useWillUnmount from './useWillUnmount';
/*
* Browsers including Internet Explorer, Chrome, Safari, and Firefox store the
* delay as a 32-bit signed integer internally. This causes an integer overflow
* when using delays larger than 2,147,483,647 ms (about 24.8 days),
* resulting in the timeout being executed immediately.
*
* via: https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/setTimeout
*/
const MAX_DELAY_MS = 2 ** 31 - 1;
function setChainedTimeout(handleRef, fn, timeoutAtMs) {
const delayMs = timeoutAtMs - Date.now();
handleRef.current = delayMs <= MAX_DELAY_MS ? setTimeout(fn, delayMs) : setTimeout(() => setChainedTimeout(handleRef, fn, timeoutAtMs), MAX_DELAY_MS);
}
/**
* Returns a controller object for setting a timeout that is properly cleaned up
* once the component unmounts. New timeouts cancel and replace existing ones.
*
*
*
* ```tsx
* const { set, clear } = useTimeout();
* const [hello, showHello] = useState(false);
* //Display hello after 5 seconds
* set(() => showHello(true), 5000);
* return (
* <div className="App">
* {hello ? <h3>Hello</h3> : null}
* </div>
* );
* ```
*/
export default function useTimeout() {
const isMounted = useMounted();
// types are confused between node and web here IDK
const handleRef = useRef();
useWillUnmount(() => clearTimeout(handleRef.current));
return useMemo(() => {
const clear = () => clearTimeout(handleRef.current);
function set(fn, delayMs = 0) {
if (!isMounted()) return;
clear();
if (delayMs <= MAX_DELAY_MS) {
// For simplicity, if the timeout is short, just set a normal timeout.
handleRef.current = setTimeout(fn, delayMs);
} else {
setChainedTimeout(handleRef, fn, Date.now() + delayMs);
}
}
return {
set,
clear,
handleRef
};
}, []);
}