Describe the bug

After upgrading to Laravel Mix 6/PostCSS 8/Webpack 5.
When trying to comple i'm getting the following error:

ERROR in ./resources/js/services/sliphuaPjax.js 7:0-50
Module not found: Error: Package path ./dist/pjax.esm.js is not exported from package C:\projectName\node_modules\@sliphua\pjax (see exports field in C:\projectName\node_
modules\@sliphua\pjax\package.json)

At /resources/js/services/sliphuaPjax.js i simply import the package as stated at the docs:
import Pjax from '@sliphua/pjax/dist/pjax.esm.js

It used to work perfectly up until the point in which i've upgraded Laravel Mix/Webpack.

To reproduce

No response

Expected behavior

No response

Environment

- OS: Windows 10
- Browser: Not relevant
- Pjax: Latest

Anything else?

No response