export declare class NumberHelper {
  static isNumber: (str: string) => boolean;
  static convertToNumber: (str: string) => number;
  static replaceNumber: (str: string) => string;
  static replaceFloat: (str: string) => string;
  static toFixed: (num: number, fixed: number) => string;
  static parseFloatFixed: (str: string, fixed: number) => string;
  static getDecimalLength: (str: string) => number;
  static toNumber: (str: string) => number;
}