Cloud Functions 오류

HTTP Error: 400, The request has errors


Functions deploy had errors with the following functions:
    myFuction


To try redeploying those functions, run:
    firebase deploy --only functions: myFuction


To continue deploying other features (such as database), run:
    firebase deploy --except functions

Error: Functions did not deploy properly.

원인

쓸데없는 패턴

exports.myFuction = functions.firestore
  .document('users/{userId}/events')
  .onWrite((change, context) => {
    // 略
  });

좋은 패턴

exports.myFuction = functions.firestore
  .document('users/{userId}/events/{eventId}')
  .onWrite((change, context) => {
    // 略
  });