import type { TestResult, RuleInput } from '../types.js';
export type HreflangEntry = {
    hreflang: string;
    href: string;
};
export type HreflangResult = TestResult<HreflangEntry[], {
    consistent: true;
}>;
/**
 * Validates hreflang link elements for multilingual sites.
 *
 * Checks:
 * 1. Each hreflang entry has a non-empty href
 * 2. hreflang values are valid BCP 47 language tags (or x-default)
 * 3. If multiple hreflang links exist, x-default should be present
 * 4. No duplicate hreflang values
 * 5. Each alternate page should contain a reciprocal hreflang pointing back
 *    (reciprocal check is a warning only — requires fetching alternates)
 *
 * Pass: all present hreflang annotations are consistent
 * Skip (pass with message): page has no hreflang annotations
 */
export declare function checkHreflang(input: RuleInput): HreflangResult;
//# sourceMappingURL=hreflang.d.ts.map