⚡ Live Sandbox: AI Dev Tool: So youd like to

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```python
# AI Dev Tool: Next.js Expo Monorepo Boilerplate with Passkey Authentication
# =====================================================================================
# This is a high-demand production-ready developer code asset for creating a Next.js Expo Monorepo
# with Passkey authentication. It provides a starter boilerplate for building scalable and secure
# web applications with a modern tech stack.

import os
import json
from typing import Dict, List
from fastapi import FastAPI, HTTPException
from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
from pydantic import BaseModel
from supabase import create_client, Client

# Initialize Supabase client
SUPABASE_URL = os.environ.get("SUPABASE_URL")
SUPABASE_KEY = os.environ.get("SUPABASE_KEY")
supabase: Client = create_client(SUPABASE_URL, SUPABASE_KEY)

# Initialize FastAPI app
app = FastAPI()

# Define Passkey model
class Passkey(BaseModel):
    id: int
    user_id: int
    passkey: str

# Define authentication scheme
security = HTTPBearer()

# Define route for creating a new passkey
@app.post("/passkeys/")
async def create_passkey(passkey: Passkey, credentials: HTTPAuthorization

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