declare module '*.css';
declare module '*.less';
declare module 'vfile-message';

interface Number {
  add: (num: number | string, fixed?: number) => number;
  sub: (num: number | string, fixed?: number) => number;
  mul: (num: number | string, fixed?: number) => number;
  div: (num: number | string, fixed?: number) => number;
  mod: (num: number | string, fixed?: number) => number;
  _toFixed: (fixed?: number) => number;
  _toPrecision: (fixed?: number) => number;
  _toThousands: (fixed?: number) => number;
  _toFormatWithUnit: () => number;
}