class Plumb::HashMap

def call(result)
  return result.invalid(errors: 'must be a Hash') unless result.value.is_a?(::Hash)
  errors = {}
  parsed = result.value.each.with_object({}) do |(key, value), memo|
    key_r = @key_type.resolve(key)
    value_r = @value_type.resolve(value)
    errs = []
    errs << "key #{key_r.errors}" unless key_r.valid?
    errs << "value #{value_r.value.inspect} #{value_r.errors}" unless value_r.valid?
    errors[key] = errs unless errs.empty?
    memo[key_r.value] = value_r.value
  end
  errors.empty? ? result.valid(parsed) : result.invalid(errors:)
end