/**
 * Compute attacks and rays.
 *
 * These are low-level functions that can be used to implement xiangqi rules.
 *
 * @packageDocumentation
 */
import { SquareSet } from './squareSet.js';
import { Color, Piece, Square } from './types.js';
/**
 * Check that the move from `origin` to `dest` is valid for a stepping piece.
 * The last part of the check is to ensure a piece does not wrap around the other side of the board.
 */
export declare const isValidStep: (origin: Square, dest: Square) => boolean;
export declare const KING_SQUARES: {
    red: number[];
    black: number[];
};
export declare const ADVISOR_SQUARES: {
    red: number[];
    black: number[];
};
export declare const ELEPHANT_SQUARES: {
    red: number[];
    black: number[];
};
/**
 * Gets squares attacked or defended by a king of side `color` on `square`.
 */
export declare const kingAttacks: (color: Color, square: Square) => SquareSet;
/**
 * Gets squares attacked or defended by an advisor of side `color` on `square`.
 */
export declare const advisorAttacks: (color: Color, square: Square) => SquareSet;
/**
 * Gets squares attacked or defended by an elephant of side `color` on `square`, given `occupied` squares.
 */
export declare const elephantAttacks: (color: Color, square: Square, occupied: SquareSet) => SquareSet;
/**
 * Gets squares attacked or defended by a horse on `square` given `occupied`.
 */
export declare const horseAttacks: (square: Square, occupied: SquareSet) => SquareSet;
/**
 * Gets squares attacked or defended by a pawn of the given `color`
 * on `square`.
 */
export declare const pawnAttacks: (color: Color, square: Square) => SquareSet;
/**
 * Gets squares attacked or defended by a chariot on `square`, given `occupied`
 * squares.
 */
export declare const chariotAttacks: (square: Square, occupied: SquareSet) => SquareSet;
/**
 * Gets squares attacked or defended by a cannon on `square`, given `occupied`.
 * If `keepMount` is set to `true`, then also the potential mount (first piece encountered in a ray)
 * is included in the returned biboard. This is useful to parse SAN moves.
 * squares.
 */
export declare const cannonAttacks: (square: Square, occupied: SquareSet, keepMount?: boolean) => SquareSet;
/**
 * Gets squares seen by a `piece` on `square`, given `occupied` squares.
 */
export declare const attacks: (piece: Piece, square: Square, occupied: SquareSet) => SquareSet;
/**
 * Gets all squares of the rank, file or diagonal with the two squares
 * `a` and `b`, or an empty set if they are not aligned.
 */
export declare const ray: (a: Square, b: Square) => SquareSet;
/**
 * Gets all squares between `a` and `b` (bounds not included), or an empty set
 * if they are not on the same rank or file.
 */
export declare const between: (a: Square, b: Square) => SquareSet;