/**
 * Format detection module for multi-format import
 *
 * Detects input format based on:
 * - File extension (.json, .bib, .ris)
 * - Content patterns (JSON, BibTeX, RIS)
 * - Identifier patterns (PMID, DOI)
 * - Multiple whitespace-separated identifiers
 */
/**
 * Supported input formats
 */
export type InputFormat = "json" | "bibtex" | "ris" | "nbib" | "pmid" | "doi" | "isbn" | "arxiv" | "url" | "identifiers" | "unknown";
/**
 * Detect the format of the given input
 *
 * @param input - File path, identifier, or empty string for stdin
 * @param content - Optional content to analyze (for stdin or unknown extension)
 * @returns Detected format
 */
export declare function detectFormat(input: string, content?: string): InputFormat;
/**
 * Detect format based on file extension
 */
export declare function detectByExtension(input: string): InputFormat;
/**
 * Detect format based on content patterns
 */
export declare function detectByContent(content: string): InputFormat;
/**
 * Detect if a single string is a PMID, DOI, or ISBN
 */
export declare function detectSingleIdentifier(input: string): "pmid" | "doi" | "isbn" | "arxiv" | "url" | "unknown";
/**
 * Try to extract a PMID or PMCID from a PubMed/PMC URL.
 * Returns the extracted identifier string or null if not a PubMed URL.
 */
export declare function extractPubmedId(input: string): string | null;
/**
 * Check if input is an http/https URL that is not already matched as a known identifier (DOI, arXiv, PubMed).
 */
export declare function isUrl(input: string): boolean;
/**
 * Check if string is a valid DOI
 */
export declare function isDoi(input: string): boolean;
/**
 * Check if string is a valid PMID (numeric only)
 */
export declare function isPmid(input: string): boolean;
/**
 * Check if string is a valid ISBN (requires ISBN: prefix)
 *
 * ISBN must have ISBN: prefix and be either:
 * - ISBN-13: 13 digits
 * - ISBN-10: 10 digits (last may be X)
 */
export declare function isIsbn(input: string): boolean;
/**
 * arXiv ID pattern: YYMM.NNNNN or YYMM.NNNN with optional version suffix
 */
export declare const ARXIV_ID_PATTERN: RegExp;
/**
 * Check if input is an arXiv identifier.
 *
 * Matches:
 * - Bare IDs: 2301.13867, 2301.13867v2
 * - Prefixed: arXiv:2301.13867
 * - URLs: https://arxiv.org/abs/2301.13867
 */
export declare function isArxiv(input: string): boolean;
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