node_modules/firebase-functions/lib/function-configuration.d.ts:4:64 - error TS1005: ']' expected

Question

I am getting the following error when executing the command firebase deploy --only function in my Ionic 3 project. This solution is not working for me.

Answer 1

Judging from the github issue that you linked and the error message itself, the error seems to be due to the new readonly tuples feature. It was introduced in typescript@3.4.0 so, in theory, any typescript version higher than that should work.

In fact, firebase-functions@3.2.0 uses typescript@3.5.2 so I recommend you use the same or higher.

---

That being said, I see that you have already used typescript@3.5.3 but the error still popped up.

Version details:

"angularfire2": "^5.2.1",
"firebase": "^6.3.1",
"firebase-admin": "^8.2.0",
"firebase-functions": "3.2.0",
"typescript": "^3.5.3"

It may be because of a different (older) typescript version being used by some other package internally. Please check your package-lock.json (or yarn.lock) to confirm.

If that's not the case, then my next best guess is that ionic-app-scripts is using older typescript internally.