firebase.json

{
  "hosting": {
    "public": "packages/blog/out",
    "ignore": [
      "firebase.json",
      "**/.*",
      "**/node_modules/**"
    ],
    "headers": [
      {
        "source": "**/*.@(js|css|gif|png|jpg|ico|txt)",
        "headers": [
          {
            "key": "Cache-Control",
            "value": "max-age=31536000"
          },
          {
            "key": "Cache-Control",
            "value": "public, max-age=31536000"
          }
        ]
      },
      {
        "source": "**",
        "headers": [
          {
            "key": "X-Content-Type-Options",
            "value": "nosniff"
          },
          {
            "key": "X-Frame-Options",
            "value": "DENY"
          },
          {
            "key": "X-XSS-Protection",
            "value": "1; mode=block"
          },
          {
            "key": "Referrer-Policy",
            "value": "no-referrer"
          }
        ]
      }
    ],
    "redirects": [
      {
        "source": "/public/**",
        "destination": "/",
        "type": 301
      }
    ]
  }
}