update side effects to fix tree shaking errors #4258
Merged
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Resolves #4248
As a follow-up investigating #4248 revealed that as of October, webpack 5 does not require the sideEffects entry anymore. However I'm not removing it in this PR since i want to (1) investigate how well it (and our other target bundlers do) without that field, and (2) try and get a better sense of how webpack 5 adoption is going. But it does point towards a better future where we won't have to manually maintain that list. I'll make an issue to track removing that.
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