Treat .css and .sass/.scss as side effectful #5197
Merged
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Fixes #5140. Fixes #5188.
While unfortunate due to concerns in #5188 (comment), I don't feel comfortable with webpack's default behavior until webpack adds a warning or an error for this (webpack/webpack#6571 (comment)). When webpack does, we can reconsider and go with webpack's default behavior.
I checked that this change fixes the reproducing case in https://github.com/cdaringe/will-u-load-my-styl.