Deploying Firebase functions with a shared package shows errors about conflicting lockfiles - firebase

Question

I am working off a monorepo with folders
/front
/back
/shared
I am trying to deploy my backend functions to Firebase.
I can run them on Firebase emulator nicely locally. However, when trying to deploy them online, I am faced with this error:
...
i deploying functions
i functions: preparing codebase default for deployment
i functions: ensuring required API cloudfunctions.googleapis.com is enabled...
i functions: ensuring required API cloudbuild.googleapis.com is enabled...
i artifactregistry: ensuring required API artifactregistry.googleapis.com is enabled...
✔ functions: required API cloudfunctions.googleapis.com is enabled
✔ functions: required API cloudbuild.googleapis.com is enabled
✔ artifactregistry: required API artifactregistry.googleapis.com is enabled
i functions: Loaded environment variables from .env.
i functions: preparing functions directory for uploading...
i functions: packaged $PROJECT_PATH/MYPROJECT/back/functions (2.39 MB) for uploading
✔ functions: functions folder uploaded successfully
i functions: creating Node.js 18 function api(us-central1)...
Build failed: npm ERR! code EUSAGE
npm ERR!
npm ERR! `npm ci` can only install packages when your package.json and package-lock.json or npm-shrinkwrap.json are in sync. Please update your lock file with `npm install` before continuing.
npm ERR!
npm ERR! Invalid: lock file's #MYPROJECT/shared#1.0.0 does not satisfy #MYPROJECT/shared#
npm ERR! Missing: #MYPROJECT/shared# from lock file
npm ERR!
npm ERR! Clean install a project
npm ERR!
npm ERR! Usage:
npm ERR! npm ci
npm ERR!
...
In back/functions/package.json, I have this:
"dependencies": {
"#MYPROJECT/shared": "file:../../shared",
"cors": "^2.8.5",
"dotenv": "^16.0.3",
"express": "^4.18.2",
"firebase-admin": "^11.5.0",
"firebase-functions": "^4.2.1",
"got": "^11.8.2",
"openai": "^2.0.5",
"serialize-error": "^11.0.0",
"vite": "^4.0.4",
"vitest": "^0.28.3"
},
And in shared/package.json
"devDependencies": {
"#types/jest": "^29.1.2",
"#types/node": "^18.8.5",
"#typescript-eslint/eslint-plugin": "^5.38.0",
"#typescript-eslint/parser": "^5.38.0",
"#vitest/coverage-c8": "^0.28.3",
"eslint": "^8.23.1",
"eslint-config-airbnb": "^19.0.4",
"eslint-config-airbnb-typescript": "^17.0.0",
"eslint-config-prettier": "^8.5.0",
"eslint-plugin-import": "^2.26.0",
"eslint-plugin-prettier": "^4.2.1",
"prettier": "^2.7.1",
"typescript": "^4.8.4",
"vite": "^4.0.4",
"vitest": "^0.28.3"
}
}
In back/firebase.json I have this:
{
"source": "functions",
"functions": {
"predeploy": "npm --prefix functions run build"
}
}
I tried reinstalling everything like this:
cd $PROJECT_PATH/MYPROJECT/shared
rm -r node_modules; rm package-lock.json; npm cache clean --force
cd $PROJECT_PATH/MYPROJECT/back/functions
rm -r node_modules; rm package-lock.json; npm cache clean --force
npm install
cd $PROJECT_PATH/MYPROJECT/shared
npm install
cd $PROJECT_PATH/MYPROJECT/back/
firebase functions:delete api; firebase deploy --only functions
But I still get the same error.
Any other suggestions on what could be the issue?