firebase.json

{
  "database": {
    "rules": "database.rules.json"
  },
  "firestore": {
    "rules": "firestore.rules",
    "indexes": "firestore.indexes.json"
  },
  "functions": {
    "predeploy": [
      "npm --prefix \"$RESOURCE_DIR\" run lint"
    ]
  },
  "hosting": {
    "public": "build",
    "ignore": [
      "firebase.json",
      "**/.*"
    ],
    "rewrites": [
      {
        "source": "**",
        "function": "app"
      }
    ],
    "headers": [
      {
        "source" : "**/service-worker.js",
        "headers" : [
          {
            "key" : "Service-Worker-Allowed",
            "value" : "/"
          },
          {
            "key" : "Cache-Control",
            "value" : "no-cache"
          }
        ]
      }
    ]
  },
  "storage": {
    "rules": "storage.rules"
  }
}