useSomethingAsync.js

//useSomethingAsync.js
export default () => {
  const [thing, setThing] = useState(null);
  
  useEffect(() => {
    doAsyncThing().then(result => setThing(result));
  }, []);
  
  return thing;
};

//useSomeOtherThing.js
export default () => {
  const thing = useSomethingAsync();
  
  useEffect(() => {
    if (thing) {
      doSomethingWithThing(thing); 
    }
  }, [thing]);
};