Cloud Functionsでデプロイできない「i functions: cleaning up build files...」と言う謎のエラー。。。

なぜかデプロイできない

i  deploying functions
Running command: npm --prefix "$RESOURCE_DIR" run build

> build
> tsc

✔  functions: Finished running predeploy script.
i  functions: ensuring required API cloudfunctions.googleapis.com is enabled...
i  functions: ensuring required API cloudbuild.googleapis.com is enabled...
✔  functions: required API cloudbuild.googleapis.com is enabled
✔  artifactregistry: required API artifactregistry.googleapis.com is enabled
✔  functions: required API cloudfunctions.googleapis.com is enabled
i  functions: preparing codebase default for deployment
⚠  functions: package.json indicates an outdated version of firebase-functions. Please upgrade using npm install --save firebase-functions@latest in your functions directory.
⚠  functions: You are using an old version of firebase-functions SDK (3.15.4). Please update firebase-functions SDK to >=3.20.0
i  functions: preparing functions directory for uploading...
i  functions: packaged /Users/gen/Desktop/basic/hCalendar/functions (71.91 KB) for uploading
i  functions: ensuring required API cloudscheduler.googleapis.com is enabled...
✔  functions: required API cloudscheduler.googleapis.com is enabled
✔  functions: functions folder uploaded successfully
i  functions: creating Node.js 10 function scheduledFirestoreExport(asia-northeast2)...
⚠  functions: failed to create function projects/hcalendar-7c1f4/locations/asia-northeast2/functions/scheduledFirestoreExport
Failed to create function projects/hcalendar-7c1f4/locations/asia-northeast2/functions/scheduledFirestoreExport

Functions deploy had errors with the following functions:
	scheduledFirestoreExport(asia-northeast2)
i  functions: cleaning up build files...

Error: There was an error deploying functions

i functions: cleaning up build files...は一体何ですか？？？

# Get the latest version of the firebase command
npm install -g firebase-tools

# Unlock the deletegcfartifacts command
firebase --open-sesame deletegcfartifacts

# Run a full purge of your GCF artifacts directories
firebase functions:deletegcfartifacts

こちらを試してみるも変換なし・・・。

よくみるとfirebase-functions SDKのバージョンアップを求められていた！

⚠  functions: package.json indicates an outdated version of firebase-functions. Please upgrade using npm install --save firebase-functions@latest in your functions directory.
⚠  functions: You are using an old version of firebase-functions SDK (3.15.4). Please update firebase-functions SDK to >=3.20.0

これだ！！！

/path_to_your_project/functionsのように、ターミナルの現在地をfunctionsの階層へ移動して

sudo npm install --save firebase-functions@latest

これを実行すればfunctionsのデプロイに成功しました！！！