/**
 * Internal board representation using hybrid bitboards + mailbox
 *
 * This module provides the core board state with:
 * - Bitboards for fast attack detection and piece locations
 * - Mailbox (Int8Array) for O(1) piece lookup by square
 * - Zobrist hashing for transposition table
 * - Efficient copying and comparison
 */
import { InternalBoard, Piece, InternalColor, SquareIndex, Bitboard } from '../types';
/**
 * Create a new empty internal board
 *
 * @returns Empty board with no pieces
 */
export declare function createEmptyBoard(): InternalBoard;
/**
 * Create a new board for the starting position
 *
 * @returns Board set up for standard chess starting position
 */
export declare function createStartingBoard(): InternalBoard;
/**
 * Set a piece on the board
 *
 * @param board - Board to modify
 * @param index - Square index (0-63)
 * @param piece - Piece to place
 */
export declare function setPiece(board: InternalBoard, index: SquareIndex, piece: Piece): void;
/**
 * Remove a piece from the board
 *
 * @param board - Board to modify
 * @param index - Square index (0-63)
 */
export declare function removePiece(board: InternalBoard, index: SquareIndex): void;
/**
 * Get the piece at a square
 *
 * @param board - Board to query
 * @param index - Square index (0-63)
 * @returns Piece at the square
 */
export declare function getPiece(board: InternalBoard, index: SquareIndex): Piece;
/**
 * Get the bitboard for a specific piece type
 *
 * @param board - Board to query
 * @param piece - Piece type
 * @returns Bitboard with all pieces of this type
 */
export declare function getBitboard(board: InternalBoard, piece: Piece): Bitboard;
/**
 * Copy a board (efficient struct copy)
 *
 * @param source - Source board
 * @returns New board with same state
 */
export declare function copyBoard(source: InternalBoard): InternalBoard;
/**
 * Check if a piece belongs to a specific color
 *
 * @param piece - Piece to check
 * @param color - Color to check
 * @returns true if piece is of the given color
 */
export declare function isPieceColor(piece: Piece, color: InternalColor): boolean;
/**
 * Get the color of a piece
 *
 * @param piece - Piece to check
 * @returns Color of the piece, or null if empty
 */
export declare function getPieceColor(piece: Piece): InternalColor | null;
/**
 * Get the opposite color
 *
 * @param color - Color
 * @returns Opposite color
 */
export declare function oppositeColor(color: InternalColor): InternalColor;
/**
 * Check if a square is empty
 *
 * @param board - Board to check
 * @param index - Square index
 * @returns true if square is empty
 */
export declare function isSquareEmpty(board: InternalBoard, index: SquareIndex): boolean;
/**
 * Check if a square is occupied by an enemy piece
 *
 * @param board - Board to check
 * @param index - Square index
 * @param color - Our color
 * @returns true if square has enemy piece
 */
export declare function isSquareEnemy(board: InternalBoard, index: SquareIndex, color: InternalColor): boolean;
/**
 * Check if a square is occupied by a friendly piece
 *
 * @param board - Board to check
 * @param index - Square index
 * @param color - Our color
 * @returns true if square has friendly piece
 */
export declare function isSquareFriendly(board: InternalBoard, index: SquareIndex, color: InternalColor): boolean;
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