firebase.json

{
  "database": {
    "rules": "database.rules.json"
  },
  "functions": {
    "predeploy": [
      "yarn build"
    ]
  },
  "hosting": {
    "public": "build",
    "ignore": [
      "firebase.json",
      "**/.*",
      "**/node_modules/**"
    ],
    "rewrites": [
      {
        "source": "/highscore/add**",
        "function": "addHighScore"
      },
      {
        "source": "/highscore/remove**",
        "function": "removeHighScore"
      },
      {
        "source": "/highscore/reset**",
        "function": "resetHighScore"
      },
      {
        "source": "/highscore/xml**",
        "function": "exportXml"
      },
      {
        "source": "/highscore/json**",
        "function": "exportJson"
      },
      {
        "source": "**",
        "destination": "/index.html"
      }
    ]
  },
  "emulators": {
    "functions": {
      "port": 5001
    },
    "database": {
      "port": 9000
    },
    "ui": {
      "enabled": true
    }
  }
}