firebase.json

{
  "hosting": {
    "public": "dist",
    "rewrites": [
      {
        "source": "**",
        "destination": "/index.html"
      }
    ],
    "headers": [
      {
        "source": "**/*",
        "headers": [
          {
            "key": "Content-Security-Policy",
            "value": "script-src 'self' 'nonce-2726c7f26c' www.googletagmanager.com cdnjs.cloudflare.com www.google-analytics.com"
          },
          {
            "key": "X-Frame-Options",
            "value": "SAMEORIGIN"
          },
          {
            "key": "X-XSS-Protection",
            "value": "1; mode=block"
          }
        ]
      },
      {
        "source": "**/*.@(jpg|jpeg|gif|png|svg)",
        "headers": [
          {
            "key": "Cache-Control",
            "value": "max-age=2592000"
          }
        ]
      },
      {
        "source": "**/*.@(js|css)",
        "headers": [
          {
            "key": "Cache-Control",
            "value": "max-age=691200"
          }
        ]
      },
      {
        // Sets the cache header for 404 pages to cache for 5 minutes
        "source": "404.html",
        "headers": [
          {
            "key": "Cache-Control",
            "value": "max-age=300"
          }
        ]
      }
    ]
  }
}