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> allows end users to shave off up to half of the runtime size via tree-shaking

Doesn’t webpack support actual tree-shaking (not just modules) or is that still a Rollup-only feature? There should be little difference in size in importing packages vs files if tree-shaking is on.

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Webpack doesn't support actual, statically checked tree shaking for now. There is a parameter called ''sideEffects'' you can employ in your package.json, which if switched to off gives hints to the compiler that your code is side-effect free and can thus be eliminated if not used.

It will on or after October 10th, which is when the next version of Webpack is slated to release.

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