export declare namespace ArrayTools {
    function insert<T>(arr: T[], val: T | T[], previousItem?: T): void;
    function getArray<T>(value: T | T[] | undefined): T[];
    function shuffle<T>(array: T[]): T[];
    function getUniqueRandomKeys(array: any[], count: number): string[];
    function getUniqueRandomValues<T>(array: T[], count: number): T[];
    function getRandomValue<T>(array: T[]): T;
}