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I don't think "validator" is the right word though - validator implies a thing that tells you whether the data is valid or not (boolean). These "decoders" generally take it a step further, they provide the narrowed type (if the decode is successful). io-ts calls the data structure a "codec", because it can be used to both encode and decode data.
I hadn't heard of Zod! Very similar indeed, I will have to check it out. If you're wondering exactly how it works, check out this earlier piece I wrote.
Neat. I think Zod is the best known solution to this problem but it doesn't work in pure Typescript. This looks like it might which would be great but I also don't see how it could work...
If you don't want any runtime overhead, you should just use a TS types generator or some compile time magic to call your api route functions directly. For GraphQL, there is the amazing graphql-code-generator which generates fully typed functions you can call on the frontend from your schema.
Lol, look what I just found, someone created a whole petition about adding runtime type information (which would make a lot of use libraries redundant): https://www.typescriptneedstypes.com/
Yeah I see what you mean. Indeed all the typing information evaporates after the compilation but I really don't get why it has to be this way to the very end. If you read the ticket https://github.com/microsoft/TypeScript/issues/3628 nowhere the TS team gave any compelling explanation, and it is crazy how many approaches people came up with on how to address it.
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