firebase.json

{
  "emulators": {
    "auth": {
      "host": "0.0.0.0",
      "port": 9099
    },
    "firestore": {
      "host": "0.0.0.0",
      "port": 8080
    },
    "storage": {
      "host": "0.0.0.0",
      "port": 9199
    },
    "hosting": {
      "host": "0.0.0.0",
      "public": "build/web",
      "port": 5000
    },
    "ui": {
      "enabled": true,
      "port": 4000
    }
  },
  "storage": {
    "rules": "storage.rules"
  },
  "firestore": {
    "rules": "firestore.rules"
  },
  "hosting": [
    {
      "public": "policy",
      "target": "policy",
      "ignore": [
        "firebase.json",
        "**/.*",
        "**/node_modules/**"
      ],
      "rewrites": [
        {
          "source": "**",
          "destination": "/index.html"
        }
      ]
    },
    {
      "public": "build/web",
      "target": "production",
      "ignore": [
        "firebase.json",
        "**/.*",
        "**/node_modules/**"
      ],
      "rewrites": [
        {
          "source": "**",
          "destination": "/index.html"
        }
      ]
    },
    {
      "public": "build/web",
      "target": "test",
      "ignore": [
        "firebase.json",
        "**/.*",
        "**/node_modules/**"
      ],
      "rewrites": [
        {
          "source": "**",
          "destination": "/index.html"
        }
      ]
    }
  ]
}