require doesn't support `default` exports in ES Modules in Webpack

Day.js added module in package.json in v1.8.1+ , in order to support ES Modules.

However, there’s some unexpected behavior while using commonJS require with webpack

And there a discussion from webpack here, https://github.com/webpack/webpack/issues/4742

const dayjs = require('dayjs') // works with 1.8.0 - 


const dayjs = require('dayjs') // broken with 1.8.1 +
const dayjs = require('dayjs').default // works with 1.8.1 +

Note: add .default is just a temporary workaround, and it’s still a bug with webpack we think. Since default is an artifact of ES Modules and should not appear in CJS requires

[iamkun]

@githoniel

In v1.8.6, I changed module back to the umd version. This might could solve this issue, but of course not a good practice.

"main": "dayjs.min.js",
"module": "dayjs.min.js",

However, we could still use the ESM version like this

import dayjs from 'dayjs/esm'

[iamkun]

After a lot of issues related to the ESM module entry.

A final decision here: https://github.com/iamkun/dayjs/pull/1314

This package will not ship with package.json module entry.