DO NOT MERGE prevent importing Sass/CSS from JS #1160
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this is currently "possible", as that's just what
css-loader
does, but it's seemingly not compatible with the asset loader (not entirely sure why;mini-css-extract-plugin
should be able to extract these and output them in the asset manifest just fine. i will do some more testing).since this is broken, and not an intended use case, i think it's best to prevent engineers doing this, so they can get earlier feedback about something that's not going to work.
after some discussion at Dev Huddle, we came to the consensus that this is fine to release as a patch version; nobody is aware of any use of CSS imports from JS, and there was agreement that going from silently broken styles in prod to a build failure is a non-breaking change for an undocumented feature.