export declare const map_limit: (a: any, b: any) => {};
export declare const map_min: (a: any, b: any) => {};
export declare const map_max: (a: any, b: any) => {};
export declare function sum(arr: any, start?: number): any;
export declare function is_zero_map(map: undefined | null | object): boolean;
export declare function map_without_undefined(map?: object): object | undefined | null;
export declare function map_mutate_out_undefined(map: object): void;