将commonjs模块与ES6模块混合以导出两个功能

Question

I have this file: commonutils.js

import { isBoolean, isNil  } from 'lodash'; // isNil , check undefined or null
import moment from 'moment';

let dateToISO = function (dateString) {
  if (!dateString) {
    return null;
  }
  let p = dateString.split(/\D/g);
  return [p[2], p[1], p[0]].join('-');
}
let ISOtoDate = function (dateString) {
  if ( isNil(dateString) || dateString === '') {
    return  '';
  }
  return moment(dateString).format('DD-MM-YYYY');
}

module.exports.dateToISO = dateToISO;
module.exports.ISOtoDate = ISOtoDate;

when I try to import on webstorm , webstorm complete the names to imports when I type:

import { dateToISO,  ISOtoDate } from './commonutils';

but when i execute, i get this error:

./src/utils/validators.js
8:10-19 './commonutils' does not contain an export named 'dateToISO'.

what are I'm doing wrong?

update:

importing with this:

const { dateToISO,  ISOtoDate } = require('./commonutils');

I get :

TypeError: Cannot set property 'dateToISO' of undefined
> module.exports.dateToISO = dateToISO;

Answer 1

You are using a CommonJS module export syntax with an ES6 import. For import, you need to do something like:

const { dateToISO,  ISOtoDate } = require('./commonutils');