add callback support for defaultValidationErrorsShape

[mammadataei]

I need to change the validation errors shape globally, but defaultValidationErrorsShape is not dynamic. A transformed callback like handleValidationErrorsShape but in createSafeActionClient would be a great option.

[TheEdoRan]

Yes, I agree, it would be great! But unfortunately it's impossible to infer the validation errors structure types from a client-level function. That's why you can only set "formatted" or "flattened" at the instance level.

[mammadataei]

What about providing a generic validation errors type to the client instance?

type ValidationErrors = ...

createSafeActionClient<ValidationErrors>({
  defaultValidationErrorsShape: (ve): ValidationErrors => {}
})