import type { CustomSyntaxChecker } from '../../types.js';
/**
 * Validates a duration string in ISO 8601-like format (e.g., `PT1H30M`).
 *
 * @see https://html.spec.whatwg.org/multipage/common-microsyntaxes.html#durations
 */
export declare const checkDurationISO8601LikeString: CustomSyntaxChecker;
/**
 * Validates a duration string in component list format (e.g., `1h 30m 5s`).
 *
 * @see https://html.spec.whatwg.org/multipage/common-microsyntaxes.html#durations
 */
export declare const checkDurationComponentListString: CustomSyntaxChecker;