How to use workspace venv with monorepo setup for cloud functions for firebase?

[debkanchan]

I have an existing project to which I am adding firebase functions. I manage the workspace and deps using uv package manager. There is one .venv at the root.

If I try to run firebase emulators:start I get the following error:

i  functions: Watching "/Users/debkanchan/Code/paralegal-ai/pipelines/supreme-court/process" for Cloud Functions...
⬢  functions: Failed to load function definition from source: FirebaseError: Failed to find location of Firebase Functions SDK: Missing virtual environment at venv directory. Did you forget to run 'python3.12 -m venv venv'?

Here is my directory structure:

pipelines/
├─ .venv/
├─ pyproject.toml
├─ requirements.txt
├─ firebase.json
├─ supreme-court/
│  ├─ process/
│  │  ├─ main.py
│  │  ├─ step1.py
│  │  ├─ step2.py
│  │  ├─ pyproject.toml

the functions are in./supreme-court/process/main.py

Here's the content of my firebase.json

{
  "functions": [
    {
      "source": "supreme-court/process",
      "codebase": "supreme-court",
      "ignore": [
        ".venv",
        ".git",
        "firebase-debug.log",
        "firebase-debug.*.log",
        "*.local"
      ]
    }
  ]
}