<!-- When reporting a bug or requesting a feature, please do the following: * Describe what esbuild is doing incorrectly and what it should be doing instead. * Provide a way to reproduce the issue. The best way to do this is to demonstrate the issue on the playground (https://esbuild.github.io/try/) and paste the URL here. A link to a minimal code sample with instructions for how to reproduce the issue may also work. Issues without a way to reproduce them may be closed. --> Hello. How can I make Bar being removed by tree shaking? Thanks! https://esbuild.github.io/try/#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
