Standardize on useUser hook

web/components/header.tsx

@@ -1,7 +1,7 @@
 import { Popover } from '@headlessui/react'
 import Link from 'next/link'
-import { useEffect, useState } from 'react'
-import { firebaseLogin, listenForLogin, User } from '../lib/firebase/users'
+import { useUser } from '../hooks/use-user'
+import { firebaseLogin } from '../lib/firebase/users'
 
 const navigation = [
   {
@@ -12,12 +12,11 @@ const navigation = [
 ]
 
 function SignInLink() {
-  const [user, setUser] = useState<User | null>(null)
-  useEffect(() => listenForLogin(setUser), [])
+  const user = useUser()
 
   return (
     <>
-      {user && user.id ? (
+      {user ? (
         <Link href="/account">
           <a className="text-base font-medium text-green-400 hover:text-gray-300">
             {user.name}

web/hooks/use-user.ts

@@ -3,10 +3,6 @@ import { listenForLogin, User } from '../lib/firebase/users'
 
 export const useUser = () => {
   const [user, setUser] = useState<User | null>(null)
-
-  useEffect(() => {
-    return listenForLogin(setUser)
-  }, [])
-
+  useEffect(() => listenForLogin(setUser), [])
   return user
 }

web/lib/firebase/users.ts

@@ -32,7 +32,7 @@ export async function setUser(userId: string, user: User) {
 }
 
 const CACHED_USER_KEY = 'CACHED_USER_KEY'
-export function listenForLogin(onUser: (_user: User) => void) {
+export function listenForLogin(onUser: (_user: User | null) => void) {
   // Immediately load any persisted user object from browser cache.
   const cachedUser = localStorage.getItem(CACHED_USER_KEY)
   if (cachedUser) {
@@ -63,9 +63,8 @@ export function listenForLogin(onUser: (_user: User) => void) {
       // Note: Cap on localStorage size is ~5mb
       localStorage.setItem(CACHED_USER_KEY, JSON.stringify(fetchedUser))
     } else {
-      // User logged out; reset to the empty object
-      onUser({} as User)
-      localStorage.removeItem(CACHED_USER_KEY)
+      // User logged out; reset to null
+      onUser(null)
     }
   })
 }

web/pages/account.tsx

@@ -1,11 +1,10 @@
 import { useRouter } from 'next/router'
-import { useEffect, useState } from 'react'
-import { firebaseLogout, listenForLogin, User } from '../lib/firebase/users'
+import { firebaseLogout } from '../lib/firebase/users'
 import { Header } from '../components/header'
+import { useUser } from '../hooks/use-user'
 
 export default function Account() {
-  const [user, setUser] = useState<User | null>(null)
-  useEffect(() => listenForLogin(setUser), [])
+  const user = useUser()
   const router = useRouter()
 
   return (