本页
    
    onAuthStateChange()
每次发生认证事件时都会收到通知。
  final authSubscription = supabase.auth.onAuthStateChange.listen((data) {
  final AuthChangeEvent event = data.event;
  final Session? session = data.session;
});
  
  Notes
- 认证事件的类型: AuthChangeEvent.passwordRecovery,AuthChangeEvent.signedIn,AuthChangeEvent.signedOut,AuthChangeEvent.tokenRefreshed,AuthChangeEvent.userUpdatedandAuthChangeEvent.userDeleted
Examples
监听认证变化
  final authSubscription = supabase.auth.onAuthStateChange.listen((data) {
  final AuthChangeEvent event = data.event;
  final Session? session = data.session;
});
  
  监听一个特定的事件
  final authSubscription = supabase.auth.onAuthStateChange.listen((data) {
  final AuthChangeEvent event = data.event;
  if (event == AuthChangeEvent.signedIn) {
    // handle signIn
  }
});
  
  退订自动订阅
  final authSubscription = supabase.auth.onAuthStateChange((event, session) {});
authSubscription.cancel();