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Those are good links to interesting discussions on the topic, I guess UglifyJS is better than nothing although you're right there.

Are you aware of any alternative that can do tree shaking? Reading those issues' comments there is a link to babel-webpack-tree-shaking [1] which seems to do it?

[1] https://github.com/Aladdin-ADD/babel-webpack-tree-shaking

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Rollup [1] seems to be pretty good at tree-shaking and apparently babel's babili minifier [2] is better than UglifyJS (but I guess it's too early to tell)

But both come with their own tradeoffs: Rollup is ES6 only and doesn't support certain features from TC39's Stage 3. Babili is very very new :)

[1] https://rollupjs.org

[2] https://github.com/babel/minify

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