/**
 * Rule that validates required `<select>` elements have a placeholder label option.
 *
 * Per the HTML spec, a `<select>` with `required`, without `multiple`, and with a
 * display size of 1 must have a placeholder label option (first `<option>` with
 * an empty value directly under `<select>`).
 */
declare const _default: Readonly<import("@markuplint/ml-core").RuleSeed<boolean, undefined>>;
export default _default;