react-use/src/useObservable.ts
2019-04-12 23:18:11 +10:00

15 lines
360 B
TypeScript

import { useEffect, useState } from 'react';
const useObservable = <T>(observable$, initialValue?: T): T | undefined => {
const [value, update] = useState<T | undefined>(initialValue);
useEffect(() => {
const s = observable$.subscribe(update);
return () => s.unsubscribe();
}, [observable$]);
return value;
};
export default useObservable;