export declare function isObject(obj: unknown): obj is object;
export declare function isEmpty(obj: unknown): boolean;
export declare function isEmptyObject(obj: unknown): boolean;
export declare function isNumber(obj: unknown): obj is number;
export declare function isArray(array: any): array is any[];
export declare function isUndefinedOrNull(value: unknown): value is null | undefined;
export declare function isFunction(obj: unknown): obj is Function;
export declare function isSet(obj: unknown): obj is Set<unknown>;
export declare function isMap(obj: unknown): obj is Map<unknown, unknown>;
export declare function isPromise<T>(obj: unknown): obj is Promise<T>;
export declare function isIterable<T>(obj: unknown): obj is Iterable<T>;