I made some investigation and have questions.

I think we can't use it at: rw-input, textarea etc. I can't find there a kind that can be passed.

So there are two options that made some sense.

Root-level form errors (login, register, etc.), the only kind I see is the serverError. Change will be cosmetic. Is it a use case you search?
Coupon field in checkout-review-step. It has two types:
a) couponError
b) couponInvalid

But here we're changing:

@else if (codeField.errors().length && codeField.dirty()) {
  <img ngSrc="/icons/error.svg" alt="" width="16" height="16" class="coupon-hint__icon" />
  {{ codeField.errors()[0].message }}
}

} @else if (codeField.getError('couponInvalid'); as err) {
  <img ngSrc="/icons/error.svg" ... />
  {{ err.message }}
} @else if (codeField.getError('couponError'); as err) {
  <img ngSrc="/icons/warning.svg" ... />
  {{ err.message }}
}

So the oneliner changes into separate errors, but here codeField.errors()[0].message will display errors properly, because the errors will never happen simultaneously?

Uh oh!

FieldState.getError() #36

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