firebase.json

{
  "hosting": {
    "public": "public",
    "ignore": [
      "firebase.json",
      "**/.*",
      "**/node_modules/**"
    ],
    "headers": [ 
      {
        "source" : "**/*.@(eot|otf|ttf|ttc|woff|font.css)",
        "headers" : [ 
          {
            "key" : "Access-Control-Allow-Origin",
            "value" : "*"
          } 
        ]
      }, {
        "source" : "**/*.@(js|css)",
        "headers" : [ 
          {
            "key" : "Cache-Control",
            "value" : "max-age=7948800"
          } 
        ]
      }, {
        "source" : "**/*.@(jpg|jpeg|gif|png|svg)",
        "headers" : [ 
          {
            "key" : "Cache-Control",
            "value" : "max-age=31536000"
          } 
        ]
      }, {
        "source" : "**/*.@(ttf|woff|woff2)",
        "headers" : [ 
          {
            "key" : "Cache-Control",
            "value" : "max-age=7948800"
          }
        ]
      } 
    ],
    "rewrites": [
      {
        "source": "**",
        "destination": "/index.html"
      }
    ]
  }
}