fix(shaker): named exports are removed (#800) #801
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Motivation
See #800
Summary
In some cases, Babel generates code that depends on hoisted variables. Since
shakeruses simplified tree traversing, it doesn't properly process those cases and isn't able to evaluate the dependencies of a shaking file.The best solution here would be migration to
@babel/traverse. However, it will take a while.So that, this PR implements the worst solution :) I've added a dirty hack to
preeval, that checks that generated code has those "wrong" variables and hoists them.Test plan
One test was added, one test was fixed.