import type { H1Result, RuleInput } from '../types.js';
/**
 * Validates that exactly one <h1> element exists on the page.
 *
 * Pass: exactly 1 h1 element
 * Fail: 0 h1 elements (missing) or 2+ h1 elements (duplicates)
 */
export declare function checkH1Single(input: RuleInput): H1Result;
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