beforeUserSignedIn method
Handles an event that is triggered before a user is signed in. @param optsOrHandler - Either an object containing function options, or an event handler (run before user signin) @param handler - Event handler which is run every time before a user is signed in
Implementation
external JSFunction beforeUserSignedIn(
JSObject optsOrHandler, [
// (AuthBlockingEvent event) => FutureOr<BeforeSignInResponse?>
JSFunction handler,
]);