message: Use `oneOf` to check the input element
diff: @@ -22,9 +22,8 @@ export default class Field extends React.PureComponent {
  // The field's ID, which binds the input and label together.
  id: PropTypes.string.isRequired,
  // The element to create. Defaults to "input".
  - // Should be "input", "select", or "textarea".
  // To define options for a select, use <Field><option ... /></Field>
  - element: PropTypes.string,
  + element: PropTypes.oneOf(["input", "select", "textarea"]),
  // The field's type (when used as an <input>). Defaults to "text".
  type: PropTypes.string,
  // The field's label string.
  