export interface CrossrefUpdateInfo {
    type: string;
    doi?: string;
    label?: string;
    date?: string;
}
export interface RemoteMetadata {
    title?: string;
    author?: Array<{
        family?: string;
        given?: string;
    }>;
    containerTitle?: string;
    type?: string;
    page?: string;
    volume?: string;
    issue?: string;
    issued?: {
        "date-parts"?: number[][];
    };
}
export type CrossrefResult = {
    success: true;
    updates: CrossrefUpdateInfo[];
    metadata?: RemoteMetadata;
} | {
    success: false;
    error: string;
};
/**
 * Query Crossref REST API for a DOI and extract update-to information.
 *
 * @param doi - The DOI to query
 * @param config - Optional config with email for polite pool
 * @returns Crossref result with update information
 */
export declare function queryCrossref(doi: string, config?: {
    email?: string;
}): Promise<CrossrefResult>;
//# sourceMappingURL=crossref-client.d.ts.map