> No, and neither does Typescript. One of the biggest weaknesses in Typescript is that it can't validate data across the wire. Which is a major use case for the

> No, and neither does Typescript. One of the biggest weaknesses in Typescript is that it can't validate data across the wire. Which is a major use case for the language. Not sure what particular use case you have in mind but which language has built-in functionality to validate chunks of bytes without some kind of type definition? To me this is an orthogonal problem to language design. Every web framework has to serialize and deserialize data. What I was getting at is that TypeScript is perfectly suited to define type safe data structures wihtout reinventing the wheel. If you're going to parse type definitions for your validation middleware you might as well use something that can also applied to your business logic.