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experimental.tsx
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experimental.tsx
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/// <reference types="../experimental"/>
import React = require('react');
function useExperimentalHooks() {
const [toggle, setToggle] = React.useState(false);
const [startTransition, done] = React.unstable_useTransition({ busyMinDurationMs: 100, busyDelayMs: 200, timeoutMs: 300 });
// $ExpectType boolean
done;
// $ExpectType boolean
const deferredToggle = React.unstable_useDeferredValue(toggle, { timeoutMs: 500 });
const [func] = React.useState(() => () => 0);
// $ExpectType () => number
func;
// $ExpectType () => number
const deferredFunc = React.unstable_useDeferredValue(func);
class Constructor {}
// $ExpectType typeof Constructor
const deferredConstructor = React.unstable_useDeferredValue(Constructor);
// $ExpectType () => string
const deferredConstructible = React.unstable_useDeferredValue(Constructible);
return () => {
startTransition(() => {
setToggle(toggle => !toggle);
});
// The function must be synchronous, even if it can start an asynchronous update
// it's no different from an useEffect callback in this respect
// $ExpectError
startTransition(async () => {});
// Unlike Effect callbacks, though, there is no possible destructor to return
// $ExpectError
startTransition(() => () => {});
};
function Constructible() {
return '';
}
}