export type Coordinates = {
    latitude: number | string;
    longitude: number | string;
};
export declare const isValidCoordinates: (subject: object) => subject is Coordinates;
export declare const isValidCode: (subject: unknown) => subject is string;
export declare const digitToValue: (x: string) => number;
export declare const valueToDigit: (x: number) => string;
export declare const parseNum: (value: number | string) => number;
export declare const arrayOf: <T>(count: number, fill: T) => T[];
export declare const flatten: <T>(a: T[]) => T[];
export declare const zip: <T, U>(a: T[], b: U[]) => (T | U)[][];