/**
 * Calculates and returns the best rational approximation of the given real number.
 * @private
 * @param {string|number|BigNumber} rawNumber Real number
 * @throws Error Throws `Error` when the best rational approximation cannot be found.
 * @returns {array} first element is n (numerator), second element is d (denominator)
 */
export declare function best_r(rawNumber: any): number[];
export declare function set(obj: object, path: string | [] | any, value: any): object;
export declare function upperSnakeCase(str: string): string;