firebase.json

{
  "hosting": {
    "public": "hosting/build",
    "ignore": [
      "firebase.json",
      "**/.*",
      "**/node_modules/**"
    ],
    "predeploy": [
      "npm --prefix $PROJECT_DIR/hosting ci",
      "npm --prefix $PROJECT_DIR/hosting run build"
    ],
    "rewrites": [
      {
        "source": "**",
        "destination": "/index.html"
      }
    ]
  },
  "emulators": {
    "functions": {
      "port": 5001
    },
    "firestore": {
      "port": 8080
    },
    "hosting": {
      "port": 5100
    },
    "storage": {
      "port": 9199
    },
    "ui": {
      "enabled": true
    }
  },
  "firestore": {
    "rules": "firestore.rules"
  },
  "storage": {
    "rules": "storage.rules"
  },
  "extensions": {
    "firestore-bigquery-export": "firebase/firestore-bigquery-export@0.1.25"
  },
  "functions": {
    "ignore": [
      "node_modules",
      ".git",
      "firebase-debug.log",
      "firebase-debug.*.log"
    ],
    "predeploy": [
      "npm --prefix \"$RESOURCE_DIR\" run lint",
      "npm --prefix \"$RESOURCE_DIR\" run build"
    ]
  }
}