export default function add(a: number, b: number): number;
export declare function getNewFocusElementIndex(arr: any[], currentFocusIndex: number, deleteIndex: number): number;
export declare function isEqualArray(a: any[], b: any[]): boolean;
export declare function distance(x: number, y: number): number;
export declare function removeItem(arr: any[], item: any): void;
export declare function swapPosition(arr: any[], item2: any, item1: any): void;
export declare function detectPosition([ox, oy, w, h]: number[], [px, py]: [number, number], border: number): "center" | "top" | "right" | "bottom" | "left";
export declare function findLimintPosition(arr: number[], limit: number): {
    index: number;
    margin: number;
};
export declare function isOutside(rect: DOMRect, target: DOMRect): boolean;
export declare function keyBy<T>(arr: T[], key: keyof T): {
    [name: string]: T;
};
export declare function exclude<T>(obj: {
    [name: string]: T;
}, key: keyof T, arr: T[]): {
    [name: string]: T;
};
export declare function getFlipMatrix<T>(matrix: T[][]): T[][];
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