export type PubmedResult = {
    success: true;
    isRetracted: boolean;
    hasConcern: boolean;
} | {
    success: false;
    error: string;
};
/**
 * Query PubMed E-utilities for publication status of a PMID.
 *
 * @param pmid - The PubMed ID to query
 * @param config - Optional PubMed config (email, apiKey)
 * @returns PubMed result with retraction status
 */
export declare function queryPubmed(pmid: string, config?: {
    email?: string;
    apiKey?: string;
}): Promise<PubmedResult>;
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