What Is The Best Way To Use Async/await Inside Onauthstatechanged() Of Firebase?

I'm using Firebase authentication with async/await in React Native. I'm looking for a better way to await inside firebase function. So my question is What is the best way to use as

Solution 1:

firebase.auth().onAuthStateChanged(async user => {
  const data = await getData();
  const action = await doSomething();
  // etc.
});


// also you can use
async function asyncHandler(user) {
    const data = await doSomething();
}

firebase.auth().onAuthStateChanged(asyncHandler);