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C# / .Net will have the same issue, but when they developed native compilation for windows phone apps they added a concept of a runtime definition file that lets you control how much needs to be retained for reflection: http://msdn.microsoft.com/en-us/library/dn600639%28v=vs.110%...

The native compilation technology is moving over to normal .Net and I would imagine the runtime definition file could be used for javascript transpiling tree-shaking as well.

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Thanks on first glance that looks like a much better solution than gwts' generators.

My implementation in GWT lets you control how much is retained by using annotations to control the retention level. It even gives you the option to defer loading reflection until a future code split, such that you only download the extra bytes for reflection support when you will actually need it. See above for link.

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