firebase.json

{
  "hosting": {
    "public": "build",
    "ignore": [
      "firebase.json",
      "**/.*",
      "**/node_modules/**"
    ],
    "rewrites": [
      {
        "source": "**",
        "destination": "/index.html"
      }
    ],
    "headers": [
      {
        "source": "/service-worker.js",
        "headers": [
          {
            "key": "Cache-Control",
            "value": "no-cache"
          }
        ]
      },
      {
        "source" : "**/*.@(eot|otf|ttf|ttc|woff)",
        "headers" : [
          {
            "key" : "Access-Control-Allow-Origin",
            "value" : "max-age=2628000"
          }
        ]
      },
      {
        "source" : "**/*.@(css|jpg|jpeg|png|gif|js|ico)",
        "headers" : [
          {
            "key" : "Cache-Control",
            "value" : "max-age=2628000"
          }
        ]
      }
    ],
    "cleanUrls": true,
    "trailingSlash": false
  }
}