firebase.json

{
  "hosting": {
    "public": "build",
    "rewrites": [
      {
        "source": "**",
        "destination": "/index.html"
      }
    ],
    "headers": [
      {
        "source": "/service-worker.js",
        "headers": [
          { "key": "Content-Type", "value": "text/css" },
          {
            "key": "Cache-Control",
            "value": "no-store"
          }
        ]
      }
    ],
    "cleanUrls": true
  },
  "firestore": {
    "rules": "src/firebase/rules/firestore.rules",
    "indexes": "firestore.indexes.json"
  },
  "emulators": {
    "auth": {
      "port": 9099
    },
    "functions": {
      "port": 5001
    },
    "firestore": {
      "port": 9001
    },
    "hosting": {
      "port": 8080
    },
    "ui": {
      "enabled": true
    }
  },
  "functions": {
    "predeploy": ["npm --prefix \"$RESOURCE_DIR\" run build"],
    "source": "functions"
  }
}