Firebase Cloud Function部署功能错误：棉绒：eslint

Question

我已按照教程实施观察者通知。

exports.observeFollowing = functions.database.ref('/following/{uid}/{followingId}').onCreate((snapshot, context) => {
var uid = context.params.uid;
var followingId = context.params.followingId;
console.log('User: ' + uid + ' is following: ' + followingId);
return admin.database().ref('/users/' + followingId).once('value', snapshot => {
  var userWeAreFollowing = snapshot.val();
  return admin.database().ref('/users/' + uid).once('value', snapshot => {
    var userDoingTheFollowing = snapshot.val();
    var payload = {
      notification: {
        title: "You now have a new follower",
        body: userDoingTheFollowing.username + "is now following you",
        sound: 'default'
      }
    }
    admin.messaging().sendToDevice(userWeAreFollowing.fcmToken, payload)
      .then((response) => {
        console.log('Successfully sent message:', response);
        return response;
      }).catch(function(error) => {
        console.log('Error sending message:', error);
      });
  })
})

}）

但是，当我尝试运行firebase deploy --only functions：observe之后，我收到以下错误：

npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! functions@ lint: `eslint .`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the functions@ lint script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

我曾尝试从Stackoverflow搜索答案，但没有一个答案可行。