Configuration auto rules generation Firestore (Medium article)

firebase.json

{
  ...
  "firestore": {
    "rules": "firestore.rules",
    "indexes": "firestore.indexes.json",
    "predeploy": [
      "node generate_rules.js"
    ]
  },
  "storage": {
    "rules": "storage.rules",
    "predeploy": [
      "node generate_storage_rules.js"
    ]
  },
  ...
}