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it doesn’t work because a vendors file containing style-loader and css-loader was not being created when using async imports.
This workaround worked for me:
Creating an empty init.scss file and require('../../sass/init.scss'); in your app.js at the very top seems to solve the problem.
This workaround suggests to import a blank scss file into my app.js to force style-loader and css loader to be included in the bundle.
I found about that in laravel-mix github issue when I had the same problem before.
Source:stackexchange.com