गैर-अवरोधक UI अपडेट के लिए useTransition

const [isPending, startTransition] = useTransition();

const handleChange = (e) => {
  setInputValue(e.target.value); // urgent: update input immediately
  startTransition(() => {
    setFilteredList(filter(e.target.value)); // non-urgent
  });
};

return (
  <>
    <input value={inputValue} onChange={handleChange} />
    {isPending && <Spinner />}
    <ResultList items={filteredList} />
  </>
);

// Correct
startTransition(() => setTab('heavy'));

// Wrong — async work outside React state
startTransition(async () => { await fetch(...); }); // not supported

import { startTransition } from 'react';

startTransition(() => setQuery(newValue));

const [tab, setTab] = useState('posts');
const [isPending, startTransition] = useTransition();

const selectTab = (t) =>
  startTransition(() => setTab(t));