fix: ensure […map.keys] can be correctly transformed in loose mode
#11901
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JLHwung
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PR: Bug Fix 🐛
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kaicataldo
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Jul 31, 2020
existentialism
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Jul 31, 2020
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This PR fixes a regression introduced in #11798. It is indeed an interesting bug: Babel does not transform
[...map.keys()]correctly in the loose mode and thus it caused semantic change for@babel/standalone.is transformed to
which is an
MapIterator[]instead ofstring[].