import type { CanonicalResult, RuleInput } from '../types.js';
export type CanonicalRuleOptions = {
    /** Expected canonical URL. If provided, the rule checks this value matches. */
    expectedUrl?: string;
};
/**
 * Validates the presence of a canonical link element.
 *
 * Pass: <link rel="canonical" href="..."> exists with a non-empty href
 * Fail: canonical link missing, href empty, or (if expectedUrl given) value mismatch
 */
export declare function checkCanonical(input: RuleInput, options?: CanonicalRuleOptions): CanonicalResult;
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