useSubscriber: Baked-in hook that lets subscribers notify React when data goes stale

useSubscriber.jsx

import {useSubscriber} from 'react'

const MyComponent = (props) => {
  // Get the current value of an observable
  const value = props.value.get()
  
  // Subscribe to the observable in the render phase
  useSubscriber(forceUpdate => {
    // This code runs immediately, instead of acting like "useEffect"
    const unsub = props.value.subscribe(() => {
      forceUpdate() // This tells React that the most recent render is stale
    })
    // The returned function is called on dependency change or dismount
    return unsub
  }, deps)
  
  return <h1>{value}</h1>
}