import type { TitleResult, RuleInput } from '../types.js';
export type TitleLengthRuleOptions = {
    min?: number;
    max?: number;
};
/**
 * Validates the <title> tag existence and character length.
 *
 * Pass: title exists and length is within [min, max]
 * Fail: title missing, or length out of range
 *
 * Note: length is measured in Unicode code points (not bytes),
 * so multibyte characters (CJK, emoji) each count as 1.
 */
export declare function checkTitleLength(input: RuleInput, options?: TitleLengthRuleOptions): TitleResult;
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