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For webpack 4, I think you want to look at mini-css-extract-plugin.
its a webpack plugin that, by, default, creates different files per input. You can use this with scss as you would expect. https://stackoverflow.com/a/53180597/6646536 might be a good example.
There is a similar tool i’ve used for webpack 3 here:
https://github.com/webpack-contrib/extract-text-webpack-plugin
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