message: Prefer readonly
diff: "@typescript-eslint/no-unused-vars": "off",
  "@typescript-eslint/prefer-nullish-coalescing": "warn",
  "@typescript-eslint/prefer-optional-chain": "warn",
  + "@typescript-eslint/prefer-readonly": ["warn"],
  "@typescript-eslint/restrict-template-expressions": "off",
  "@typescript-eslint/typedef": ["warn", { "memberVariableDeclaration": true, "variableDeclaration": true }]
  }
  