Because it’s much better. Check what io-ts does, it generates types, so everything is typed. The same for useForm, it generates fields from models. As result, we write much less much powerfull code.
io-ts is battle tested and useForm is so simple there is almost no room for errors.
Assuming something is 'much better' without having tried the other things out there is a recipe for disaster and a pitfall that many developers fall into - its why people stagnate in the industry! 😂
Using Formik and Yup you also get a fully typed interface for each field along with extra bits you'll find you use in every form such as per field touch management, error handling, submission states and more.
I don't see how you can make the claim that it is any less powerful than this useForm hook.
Don't get me wrong, I know both Formik and Yup. Yup does not support branded types nor option nor any other fp-ts types. But thank you for a comment, I should highlight it.
Anyway, please check the first five minutes of this talk youtube.com/watch?v=PLFl95c-IiU to understand my motivation. It's about F#, but with io-ts, we can model a much stricter schema in a similar way. For example, string which is only the email, not any string, or an array with the first item of type A and second optional type B. We can express a lot of business rules. Email and Verified email (both strings) with type safety. Hopefully, soon you realize that plain string or number types are close to any. I recommend you try both examples.
As for useForm. Once we use io-ts, for the reasons I mentioned, we can not use Formik, and honestly, that hook is so simple yet powerful, that we don't have to. There are also other design decisions why I did not make Formik clone, but that's for another blog post.
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Rather than reinventing the wheel, why not just use tried and tested libraries like Formik for creation and state management + Yup for validation?
Once you've used them, you'll never go back.
Because it’s much better. Check what io-ts does, it generates types, so everything is typed. The same for useForm, it generates fields from models. As result, we write much less much powerfull code.
io-ts is battle tested and useForm is so simple there is almost no room for errors.
Assuming something is 'much better' without having tried the other things out there is a recipe for disaster and a pitfall that many developers fall into - its why people stagnate in the industry! 😂
Using Formik and Yup you also get a fully typed interface for each field along with extra bits you'll find you use in every form such as per field touch management, error handling, submission states and more.
I don't see how you can make the claim that it is any less powerful than this useForm hook.
Don't get me wrong, I know both Formik and Yup. Yup does not support branded types nor option nor any other fp-ts types. But thank you for a comment, I should highlight it.
Anyway, please check the first five minutes of this talk youtube.com/watch?v=PLFl95c-IiU to understand my motivation. It's about F#, but with io-ts, we can model a much stricter schema in a similar way. For example, string which is only the email, not any string, or an array with the first item of type A and second optional type B. We can express a lot of business rules. Email and Verified email (both strings) with type safety. Hopefully, soon you realize that plain string or number types are close to any. I recommend you try both examples.
As for useForm. Once we use io-ts, for the reasons I mentioned, we can not use Formik, and honestly, that hook is so simple yet powerful, that we don't have to. There are also other design decisions why I did not make Formik clone, but that's for another blog post.