Don't throw when destructuring into a var named as an import#10628
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nicolo-ribaudo merged 1 commit intobabel:masterfrom Nov 4, 2019
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nicolo-ribaudo
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Nov 2, 2019
| Q | A |
|---|---|
| Fixed Issues? | Fixes #10627 |
| Patch: Bug Fix? | Yes |
| Major: Breaking Change? | |
| Minor: New Feature? | |
| Tests Added + Pass? | Yes |
| Documentation PR Link | |
| Any Dependency Changes? | |
| License | MIT |
nicolo-ribaudo
commented
Nov 2, 2019
| } = {}); | ||
| } | ||
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| _x.foo = (2, function () { |
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In a follow up PR, this could be left as foo since we are throwing anyway.
JLHwung
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Nov 4, 2019
| .pop(); | ||
| const programScopeIds = Object.keys(ids).filter( | ||
| localName => | ||
| scope.getBinding(localName) === path.scope.getBinding(localName), |
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nit: consider to guard with scope.hasBinding to avoid unnecessary path.scope.getBinding.
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I tried to do it and found a bug which, if fixed, would break @babel/plugin-transform-runtime <= 7.6 😢
This is what currently happens:
- The imports are analyzed
- The imports are removed -> The bindings are removed
- References to imported bindings are rewritten (this file)
i) When we are comparing the bindings, the global one isundefined
ii) If the local binding isundefined, it hasn't been redefined.
I tried to swap 2 and 3, but I still can optimize away the check for the local binding because @babel/transform-runtime doesn't register the import it injects in the scope tracker.
JLHwung
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Nov 4, 2019
existentialism
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Nov 4, 2019
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