firebase.json

{
  "database": {
    "rules": "database.rules.json"
  },
  "functions": {
    "predeploy": [
      "npm --prefix \"$RESOURCE_DIR\" i",
      "npm --prefix \"$RESOURCE_DIR\" run lint",
      "npm --prefix \"$RESOURCE_DIR\" run build"
    ],
    "ignore": [
      "**/*.spec.js",
      "node_modules",
      "src"
    ]
  },
  "firestore": {
    "rules": "firestore.rules",
    "indexes": "firestore.indexes.json"
  },
  "hosting": [
    {
      "target": "onsnapshot",
      "public": "dist/onsnapshot",
      "ignore": [
        "index.html",
        "firebase.json",
        "**/.*",
        "**/node_modules/**"
      ],
      "rewrites": [
        {
          "source": "**",
          "run": {
            "serviceId": "universal"
          }
        }
      ],
      "headers": [
        {
          "source": "**/*.@(css|js)",
          "headers": [
            {
              "key": "Cache-Control",
              "value": "public, max-age=365000000, immutable"
            }
          ]
        }
      ]
    }
  ],
  "storage": {
    "rules": "storage.rules"
  }
}