export declare function cloneDeep<T>(source: T): T;
export declare function defaultsDeep<A, B>(target: A, ...sources: B[]): A & B;
export declare function defaults<T extends object, S extends Record<keyof T, unknown>>(arg: T | undefined, ...sources: (S | undefined)[]): T & S;
export declare function clone<T>(source: T): T;
export declare function range(start: number, end: number): number[];
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