• TypeScript

`unknown` vs. `any` vs. `never`

unknown is the widest type, it can't be assigned to anything. any can be assigned to anything.

unknown is a safe type, but any is not. unknown means "I don't know what this is", while any means "I don't care what this is".

— Total TypeScript: Essentials, Matt Pocock

never is the narrowest type. We most likely don't have to use it ourselves, it shows up in error messages. It represents something that can never happen, and you we never assign anything to it. But, we can assign never to anything, as it's the narrowest type.