/**
 * Duplicate detection logic
 */
import type { CslItem } from "../../core/csl-json/types.js";
import type { DuplicateResult } from "./types.js";
/**
 * Normalize DOI by removing common URL prefixes
 * Returns the DOI in format: 10.xxxx/...
 */
export declare function normalizeDoi(doi: string): string;
/**
 * Extract year from CSL-JSON issued field
 */
export declare function extractYear(item: CslItem): string | null;
/**
 * Normalize author names to "family given-initial" format
 */
export declare function normalizeAuthors(item: CslItem): string | null;
/**
 * Normalize ISBN by removing hyphens, spaces, and uppercasing X
 */
export declare function normalizeIsbnForComparison(isbn: string): string;
/**
 * Types that should match by ISBN + title (chapters in the same book can differ)
 */
export declare const BOOK_SECTION_TYPES: string[];
/**
 * Detects if a reference is a duplicate of any existing references
 *
 * Priority order:
 * 1. DOI (highest priority)
 * 2. PMID
 * 3. ISBN
 * 4. arXiv ID
 * 5. ERIC ID
 * 6. Scopus ID
 * 7. Title + Author + Year (lowest priority)
 *
 * @param item - The reference to check for duplicates
 * @param existingReferences - Array of existing references to check against
 * @returns DuplicateResult indicating if duplicate found and match details
 */
export declare function detectDuplicate(item: CslItem, existingReferences: CslItem[]): DuplicateResult;
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