firebase.json

{
  "firestore": {
    "rules": "firestore.rules",
    "indexes": "firestore.indexes.json"
  },
  "functions": {
    "predeploy": [
      "npm --prefix \"$RESOURCE_DIR\" run lint",
      "npm --prefix \"$RESOURCE_DIR\" run build"
    ],
    "source": "functions"
  },
  "hosting": {
    "public": "public",
    "cleanUrls": true,
    "trailingSlash": false,
    "headers": [
      {
        "source": "404.html",
        "headers": [
          {
            "key": "Cache-Control",
            "value": "max-age=300"
          }
        ]
      },
      {
        "source": "__/**/*",
        "headers": [
          {
            "key": "Cache-Control",
            "value": "public,max-age=604800"
          }
        ]
      },
      {
        "source": "service-worker.js",
        "headers": [
          {
            "key": "Cache-Control",
            "value": "no-cache"
          }
        ]
      },
      {
        "source": "**/node_modules/**/**",
        "headers": [
          {
            "key": "Access-Control-Allow-Origin",
            "value": "*"
          },
          {
            "key": "Cache-Control",
            "value": "no-cache"
          }
        ]
      },
      {
        "source": "javascript/**",
        "headers": [
          {
            "key": "Cache-Control",
            "value": "public,max-age=60"
          },
          {
            "key": "Access-Control-Allow-Origin",
            "value": "*"
          }
        ]
      },
      {
        "source": "css/**",
        "headers": [
          {
            "key": "Cache-Control",
            "value": "public,max-age=60"
          }
        ]
      },
      {
        "source": "images/**",
        "headers": [
          {
            "key": "Access-Control-Allow-Origin",
            "value": "*"
          },
          {
            "key": "Cache-Control",
            "value": "public,max-age=86400"
          }
        ]
      },
      {
        "source": "/robots.txt",
        "headers": [
          {
            "key": "Cache-Control",
            "value": "no-cache, no-store, max-age=0"
          }
        ]
      }
    ],
    "ignore": [
      "**",
      "!public/**"
    ],
    "rewrites": [
      {
        "source": "/{*}",
        "destination": "/index.html"
      },
      {
        "source": "/media/**",
        "function": "media-open"
      }
    ]
  },
  "storage": {
    "rules": "storage.rules"
  },
  "emulators": {
    "auth": {
      "port": 9099
    },
    "functions": {
      "port": 5001
    },
    "firestore": {
      "port": 8080
    },
    "database": {
      "port": 9000
    },
    "hosting": {
      "port": 5000
    },
    "pubsub": {
      "port": 8085
    },
    "storage": {
      "port": 9199
    },
    "ui": {
      "enabled": true,
      "port": 4000
    }
  },
  "database": {
    "rules": "database.rules.json"
  }
}