we went with typescript because it gave us more control over our classes and the variables. This allowed us to build standards and to make sure everyone was following it properly as well as made it easier to send standard data across and validate it. If we just went with pure Node.js this allows for a lot of flexibility with the variables which made it much harder to keep everything consistent and validate it. Also, the benefit of using TypeScript and having that validation is writing less code than just doing it javascript manually