/*!
 * -------------------------------------------------------------------------- *
 *                                                                            *
 *    Kokopu - A JavaScript/TypeScript chess library.                         *
 *    <https://www.npmjs.com/package/kokopu>                                  *
 *    Copyright (C) 2018-2026  Yoann Le Montagner <yo35 -at- melix.net>       *
 *                                                                            *
 *    Kokopu is free software: you can redistribute it and/or                 *
 *    modify it under the terms of the GNU Lesser General Public License      *
 *    as published by the Free Software Foundation, either version 3 of       *
 *    the License, or (at your option) any later version.                     *
 *                                                                            *
 *    Kokopu is distributed in the hope that it will be useful,               *
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of          *
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the            *
 *    GNU Lesser General Public License for more details.                     *
 *                                                                            *
 *    You should have received a copy of the GNU Lesser General               *
 *    Public License along with this program. If not, see                     *
 *    <http://www.gnu.org/licenses/>.                                         *
 *                                                                            *
 * -------------------------------------------------------------------------- */
import { PositionImpl } from './impl';
/**
 * Check whether the given position is legal or not.
 *
 * See {@link Position.isLegal} for the description of the check points enforced in this function.
 */
export declare function isLegal(position: PositionImpl): boolean;
/**
 * Refresh the legal flag of the given position if it is set to null
 * (which means that the legality state of the position is unknown).
 *
 * Together with the legal flag, the reference to the squares where the white and
 * black kings lie is updated by this function.
 */
export declare function refreshLegalFlagAndKingSquares(position: PositionImpl): void;
/**
 * Check whether the current player king is in check after moving from `from` to `to`.
 *
 * This function implements the verification steps (7) to (9) as defined in {@link isMoveLegal}.
 *
 * Precondition: {@link refreshLegalFlagAndKingSquares} must have been invoked beforehand.
 *
 * @param enPassantSquare - Index of the square where the "en-passant" taken pawn lies if any, `-1` otherwise.
 */
export declare function isKingSafeAfterMove(position: PositionImpl, from: number, to: number, enPassantSquare?: number): boolean;
/**
 * Refresh the effective castling flags of the given position if they are set to null
 * (which means that their states are unknown).
 */
export declare function refreshEffectiveCastling(position: PositionImpl): void;
/**
 * Refresh the effective en-passant flag of the given position if it is set to null
 * (which means that its state is unknown).
 */
export declare function refreshEffectiveEnPassant(position: PositionImpl): void;
export declare function isEqual(pos1: PositionImpl, pos2: PositionImpl): boolean;