import type { ParsedPage, RuleResult } from "../../types.js";
/**
 * content/heading-structure — three checks:
 *   1. Pages missing an <h1> entirely (severity: error — almost always a
 *      template bug or a misconfigured CMS).
 *   2. Pages with multiple <h1> elements (severity: warning — accessibility
 *      anti-pattern + ambiguous primary topic signal).
 *   3. Long pages (>600 words) with no <h2> sub-structure (severity: info
 *      — readability / Featured Snippet eligibility issue).
 *
 * Kept separate from `content/title-uniqueness` because heading hierarchy
 * is a different signal (Google reads H1+H2 to understand topic
 * structure) and has a different fix path.
 *
 * The 2026-05-03 blind-spot audit named the previously-phantom
 * `content/heading-uniqueness` as a gap; this is the corrected rule
 * (heading STRUCTURE, not uniqueness — duplicate H1s across catalog
 * pages aren't actually a problem the way duplicate titles are).
 */
export declare function headingStructureRule(pages: ParsedPage[]): RuleResult[];
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