Company
Date Published
Author
Brandon Bayer
Word count
993
Language
English
Hacker News points
None

Summary

Formik, a widely-used React form library, has limitations in type safety by default, particularly with the Field component's name prop, which can lead to runtime errors. To address this, a user-land solution was developed using TypeScript and the Zod schema validation library to enhance type safety across Formik components. The custom utility, makeForm(), integrates Zod schemas to type initialValues and onSubmit, and ensures that the Field component is fully typed. This approach supports the abstraction of large forms into separate components while maintaining type safety. The code implementation, described in detail, is complex but effective in preserving type integrity, even with nested form components. This method is showcased with examples, including a reset password form and abstracted field components, demonstrating advanced type-safe form handling in React applications using Formik and Zod.