export declare const exclude: <T extends Record<string, any>, Key extends keyof T>(obj: T, keys: Key[]) => {
    [k: string]: any;
};
export declare const only: <T extends Record<string, any>, Key extends keyof T>(obj: T, keys: Key[]) => {
    [k: string]: any;
};
type OneOf<T, U extends T> = U[];
export declare function isIn<T extends string | number, U extends T>(value: T, candidates: OneOf<T, U>): value is U;
export declare function groupByKey<T, K extends keyof T>(items: T[], key: K): Record<string, T[]>;
export declare function chunkArray<T>(arr: T[], size: number): T[][];
export declare function shuffleArray<T>(array: T[]): T[];
export {};