Exporting form error codes

[colevscode]

Exporting form error codes. See https://help.formspree.io/hc/en-us/articles/360055613373-The-Formspree-React-library#errorcodes

[colevscode]

Getting the isKnownError working required some typescript shenannegans, but should work.

Here's an example of how it might be used to create localized error messages (untested):

const response = await client.submitForm(...)
if (hasErrors(response.body)) {
  for (const error of response.body.errors) {
    if (isFieldError(error)) {
      querySelector(`.myForm [name=${error.field}]`).style.border = "solid red"
      querySelector(`.myForm .error#{error.field}`).innerText = translateFieldErrorMessage(error.field, error.code)
    } else if(isKnownError(error)) {
      querySelector(`.myForm .error#formErrors`).innerText = translateErrorMessage(error.code)
    } else {
      querySelector(`.myForm .error#formErrors`).innerText = translateUnknownErrorMessage()
      console.log(`UnknownError: ${error.message}`)
    }
  }
}