Codegen your TS interfaces from your server endpoints. You don't need run-time enforcement if you have a compile-time guarantee that the endpoint you're hittin

Codegen your TS interfaces from your server endpoints. You don't need run-time enforcement if you have a compile-time guarantee that the endpoint you're hitting will return a specific type back. TypeLite (https://www.nuget.org/packages/TypeLite https://www.nuget.org/packages/TypeLite) can get you halfway there with C#. I used that for a while before eventually wanting more and rolling my own solution, which takes a WebAPI endpoint and generates typed fetch methods. It's not anywhere close to polished or reusable, unfortunately.