如何在Firebase onAuthStateChanged回调中读取商店

Question

到目前为止，我一直试图修复我的代码而没有运气。这是我的问题，我非常感谢你的帮助。

1-在我的顶级索引js中，我创建了一个商店并调用store.dispatch（startListeningToAuthChanges（））

2-无状态startListeningToAuthChanges定义：

export const startListeningToAuthChanges = () => {
  return (dispatch) => {

// listen from Firebase
auth.onAuthStateChanged((user) => {

  if (user) {

    // I am already saving displayName to the store in another file and would like to read it from the store so that I can push it to Firebase. I have no idea how I can read it from the store. I tried "connect" but I keep getting undefined.

    usersRef.child(user.uid).set('Need to set displayName here'));
  } else {
    dispatch(signedOut());
  }
})

}; };