Firebase auth onAuthChange proper way to use

I’m trying to use firebase auth module but when I try to make it work with it’s method to unsubscribe it just won’t call the method itself. My first aproach was without unsubscribe method, with worked but could make me have memory leaks:

useEffect(() => {
    firebase.auth().onAuthStateChanged((user) => {
      // My method
  }, []);

Then I have been checking few websites and stackoverflow questions and they say it should be done like this:

useEffect(() => {
    const unsubscribe = firebase.auth().onAuthStateChanged((user) => {
      // My method

    return unsubscribe();
  }, []);

This just does not call the firebase.auth().onAuthChanged method. Any suggestions?

Thanks very much.

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