firebase.json

{
  "database": {
    "rules": "database.rules.json"
  },
  "firestore": {
    "rules": "firestore.rules",
    "indexes": "firestore.indexes.json"
  },
  "functions": [
    {
      "runtime": "nodejs16",
      "source": ".output/server",
      "ignore": [
        "node_modules",
        ".git",
        "firebase-debug.log",
        "firebase-debug.*.log"
      ]
    }
  ],
  "hosting": {
    "site": "nuxt-sample-79e03",
    "public": ".output/public",
    "cleanUrls": true,
    "rewrites": [{ "source": "**", "function": "server" }],
    "ignore": ["firebase.json", "**/.*", "**/node_modules/**"]
  },
  "emulators": {
    "auth": {
      "port": 9099
    },
    "functions": {
      "port": 5001
    },
    "firestore": {
      "port": 8080
    },
    "database": {
      "port": 9000
    },
    "ui": {
      "enabled": true
    },
    "singleProjectMode": true
  }
}