Login - Connect.js

  const connect = () => {
    if (!state.connecting) {
      if (state.userId && state.nickname) {
        dispatch({ type: 'start-connection' });
        Keyboard.dismiss();
        sendbird.connect(state.userId, (err, user) => {
          if (!err) {
            if (user.nickname !== state.nickname) {
              sendbird.updateCurrentUserInfo(state.nickname, '', (err, user) => {
                dispatch({ type: 'end-connection' });
                if (!err) {
                  start(user);
                } else {
                  showError(err.message);
                }
              });
            } else {
              dispatch({ type: 'end-connection' });
              start(user);
            }
          } else {
            dispatch({ type: 'end-connection' });
            showError(err.message);
          }
        });
      } else {
        showError('Please put your user ID and nickname.');
      }
    }
  };