export declare const NON_EXISTENT_SQUARE = "E";
export declare const EMPTY_SQUARE = "e";
export declare const ANIMATION_DURATION = 300;
export type Square = {
    piece: string;
    rank: string;
    file: string;
};
export type Row = Square[];
export type Col = Square[];
export type Idx = {
    row: number;
    col: number;
};
export type BoardState = {
    rows: Row[];
    locationToIdx: {
        [key: string]: Idx;
    };
    locationToUnitSqIdxs: {
        [key: string]: Idx[];
    };
};
type AddUnit = {
    x: number;
    y: number;
};
export interface BoardStateInterface {
    getNumRows(): number;
    getNumCols(): number;
    getSquare(row: number, col: number): Square;
    getPiece(location: string): string;
    isLocationNonExistent(location: string): boolean;
    getBoard(): BoardState;
    getUnitSqIdxs(location: string): {
        row: number;
        col: number;
    }[];
    getLocationIdx(location: string): {
        row: number;
        col: number;
    };
    getDiff(): {
        added: {
            [key: string]: string;
        };
        removed: {
            [key: string]: string;
        };
    };
    getIsWaitingForAnimation(): boolean;
    setManualDrop(wasManualDrop: boolean): void;
    movePiece(from: string, to: string, piece: string): void;
    materializeUnit(location: string): void;
}
/**
 * Assumption about modifiedFen string: each row should have equal number of
 * squares. Ideally this should be handled here but to make life easier for now
 * I want the provider of modifiedFen to handle this.
 *
 * Maybe I will handle it here in the future.
 */
export declare function useBoardState(modifiedFen: string, horizontalExtendLimit: number, verticalExtendLimit: number, horizontalAddUnit: AddUnit, verticalAddUnit: AddUnit): BoardStateInterface;
export declare function getDifferences(currPieceMap: {
    [key: string]: string;
}, newPieceMap: {
    [key: string]: string;
}): {
    added: {
        [key: string]: string;
    };
    removed: {
        [key: string]: string;
    };
};
export {};