@applicaster/zapp-react-native-utils/reactHooks/state/useStateFromSubscribe.ts

Applicaster Zapp React Native utilities package

import { useEffect, useState } from "react";
import type { Subject } from "rxjs";

export const useStateFromSubscribe = <T, U>(
  subject: Subject<T>,
  onUpdate: (
    observerValue: T,
    next: React.Dispatch<React.SetStateAction<U>>
  ) => void,
  initialValue: U
) => {
  const [state, setState] = useState<U>(initialValue);

  useEffect(() => {
    const subscription = subject.subscribe((observer) =>
      onUpdate(observer, setState)
    );

    return () => subscription.unsubscribe();
  }, [subject]);

  return state;
};