The Nylas Node.js SDK v6.0 introduces significant updates aimed at enhancing the developer experience, particularly by aligning more closely with TypeScript practices. This release focuses on refining class properties and function parameters to clarify which are required or optional, ensuring consistency with the API and aiding developers in anticipating function returns. By replacing "any" types with specific ones and using "Record" for JavaScript object types, the SDK tightens type usage. Object instantiation now leverages the "new" keyword with imported models, allowing IDEs to provide parameter hints and reducing reliance on API references. Additionally, the update introduces a new Model superclass for more flexible API object modeling, standardizes camelCase notation, and incorporates a switch to camelCase for all return types and parameters. This major release, available via npm, includes breaking changes and is not backward compatible, necessitating consultation of the migration guide and changelog for existing users.