Add form validations to the core

[lfades]

Validations are a very important feature where we currently lack in Next.js Commerce . An ideal solution should:

• Be opinionated, extendable, customizable, provide good defaults and be overridable
• Update our hooks to be able to define validations for the hook, with support for custom error's messages
• Include the same validations for API endpoints, we should validate user input in every scope
• Keep the same hook definition, all validations and settings should be optional, same goes for API endpoints
• Have a very small JS footprint, this is less important for API endpoints.
• Work for custom forms. We don't intend to provide core UI components for now, but our validations should be able to work in forms

Validation considerations we currently have:

• Manual

  Pros:

  • No external dependencies
  • Flexible implementation

  Cons

  • Verbose
  • Validation is hard

• Superstruct (3kb)

  Pros:

  • Easier implementation

  Cons

  • Adding external dependency
  • Force providers to use this library

For Form support:

• Manual

  Pros:

  • No external dependencies
  • Flexible implementation

  Cons

  • Implementation might be hard for some fields
  • Not performant if using connected components

• react-final-form (3kb)

  • Easy API
  • Performant

  Cons

  • Adding external dependency
  • Force providers to use this library

[Florian-crg]

I guess you've seen it but just in case react-hook-form 8.3kB, big community, very performant and easy to use.

[leerob]

Hey there! Thank you for opening this issue. We have decided to take Next.js Commerce in a new direction and will be closing out current PRs and issues due to this change. Please see this PR for more details: https://github.com/vercel/commerce/pull/966