type KeyValidation = KeyValidationSuccess | KeyValidationFailure

interface ValidationKeyResponseSuccess extends KeyValidationSuccess {
  key: string
}

interface ValidationKeyResponseFailure extends KeyValidationFailure {
  key: string
}

type ValidateKeyResponse = ValidationKeyResponseSuccess | ValidationKeyResponseFailure

type KeyValidator = (key: string) => KeyValidation | boolean

type KeyFormatter = (key: string) => string | null

interface KeyValidationSuccess {
  valid: true
  reason: null
}

interface KeyValidationFailure {
  valid: false
  reason: string
}