message: chore: allow leading underscores on variable names
diff: {
  "extends": ["tslint-config-airbnb", "tslint-config-prettier"],
  + "rules": {
  + "variable-name": [true, "ban-keywords", "check-format", "allow-leading-underscore"]
  + },
  "linterOptions": {
  "exclude": ["lib/generated/*.ts"]
  }
  