/**
 * Metadata comparator for classifying differences between local and remote metadata.
 */
import type { RemoteMetadata } from "./crossref-client.js";
export interface MetadataComparisonResult {
    classification: "metadata_mismatch" | "metadata_outdated" | "no_change";
    changedFields: string[];
    fieldDiffs: Array<{
        field: string;
        local: string | null;
        remote: string | null;
    }>;
}
/**
 * Local item fields relevant for metadata comparison.
 */
export interface LocalMetadataFields {
    title?: string;
    author?: Array<{
        family?: string;
        given?: string;
    }>;
    "container-title"?: string;
    type?: string;
    page?: string;
    volume?: string;
    issue?: string;
    issued?: {
        "date-parts"?: number[][];
    };
}
/**
 * Compare local metadata fields against remote (Crossref) metadata.
 * Classifies differences as metadata_mismatch, metadata_outdated, or no_change.
 */
export declare function compareMetadata(local: LocalMetadataFields, remote: RemoteMetadata): MetadataComparisonResult;
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