/**
 * FEN (Forsyth-Edwards Notation) parser and formatter
 *
 * FEN format: pieces turn castling enPassant halfMove fullMove
 * Example: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
 */
import { InternalBoard } from '../types';
/**
 * Parse a FEN string into an internal board
 *
 * @param fen - FEN string
 * @returns Internal board representation
 */
export declare function parseFEN(fen: string): InternalBoard;
/**
 * Validate a FEN string.
 *
 * This is intended for user-provided input. It throws with a descriptive message
 * when the FEN is invalid.
 */
export declare function validateFEN(fen: string): void;
/**
 * Convert an internal board to a FEN string
 *
 * @param board - Internal board
 * @returns FEN string
 */
export declare function toFEN(board: InternalBoard): string;
/**
 * Get FEN for starting position
 *
 * @returns FEN string for standard chess starting position
 */
export declare function getStartingFEN(): string;
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