export declare const noop: () => undefined;
export declare function getPairs(arr: any[]): any[];
export declare function symmetricDifference2(arr1: any[], arr2: any[]): any[];
export declare function symmetricDifference(...args: any[][]): any[];
export declare function hasInArr<T>(what: T, where: T[]): boolean;
export declare function uniq<T>(arr: T[]): T[];