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In theory, jQuery can be brought in by reference from Google Hosted Libraries or cdnjs or whatnot, cached for a long time, and reused in any other website that uses the same external host and version. You can't say the same about your tree-shaken thingy... However, I'm not experienced enough to say how well that works in practice.

It really doesn't work out well, especially where it matters - on mobile phones with poor connectivity. Why do you think alternatives like Zepto.js exist?

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