firebase.json

{
  "firestore": {
    "rules": "firestore.rules",
    "indexes": "firestore.indexes.json"
  },
  "hosting": {
    "public": "dist/",
    "ignore": [
      "firebase.json",
      "**/.*",
      "**/node_modules/**"
    ],
    "rewrites": [
      {
        "source": "db4/**",
        "destination": "/db4/index.html"
      },
      {
        "source": "**",
        "destination": "/index.html"
      }
    ]
  },
  "emulators": {
    "firestore": {
      "port": 8080
    },
    "hosting": {
      "port": 8082
    },
    "ui": {
      "enabled": true
    }
  }
}