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Fix _objectSpread2 for real #10188

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merged 3 commits into from Jul 9, 2019

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@nicolo-ribaudo
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commented Jul 9, 2019

Q                       A
Fixed Issues? Fixes #10166 for real maybe I hope
Patch: Bug Fix? Yes
Major: Breaking Change?
Minor: New Feature?
Tests Added + Pass? Yes
Documentation PR Link
Any Dependency Changes?
License MIT

I can't use arguments from an outer function inside an inner function.
I can't use arguments from an outer function inside an inner function.
I can't use arguments from an outer function inside an inner function.
I can't use arguments from an outer function inside an inner function.

(Thanks @hzoo for helping me finding the bug)

@maxmodel or @pwnreza Could you try to update the code in @babel/helpers inside your node_modules like I did in this PR and confirm that it works?

I'll now go hiding myself somewhere and I won't touch an helper for a few months 😆

Object.defineProperty(
target,
key,
Object.getOwnPropertyDescriptor(arguments[i], key)
Object.getOwnPropertyDescriptor(source, key)

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@nicolo-ribaudo

nicolo-ribaudo Jul 9, 2019

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This was the bug 🐞 🐞🐞🐞🐞🐞

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@hzoo

hzoo Jul 9, 2019

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Right! the forEach on line 433 (ownKeys(source).forEach(function (key) {) is it's own function scope so the arguments[i] usage here is the issue. Solution is to save it as a variable up top and reuse it everywhere.

@@ -1,6 +1,6 @@
const oldGOPDs = Object.getOwnPropertyDescriptors;
Object.getOwnPropertyDescriptors = null;

({ ...{ a: 1 }, ...{} });
({ ...{ a: 1 }, b: 1, ...{} });

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@nicolo-ribaudo

nicolo-ribaudo Jul 9, 2019

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This updated test failed before the fix.

@nicolo-ribaudo nicolo-ribaudo requested review from hzoo and existentialism Jul 9, 2019

@hzoo
hzoo approved these changes Jul 9, 2019
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👍 thanks, and it's totally cool, we all make mistakes and it's a good learning opportunity! (yes it's unfortunate it happens to be on something a lot of people use but you've been doing such a great job)

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commented Jul 9, 2019

Build successful! You can test your changes in the REPL here: https://babeljs.io/repl/build/11084/

@maxmodel

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commented Jul 9, 2019

Confirmed that this fixes the problem -- thanks so much @nicolo-ribaudo!

@nicolo-ribaudo

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commented Jul 9, 2019

Also confired by @belemaire #10166 (comment)

@nicolo-ribaudo nicolo-ribaudo merged commit fa5ec75 into babel:master Jul 9, 2019

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@nicolo-ribaudo nicolo-ribaudo deleted the nicolo-ribaudo:lololol branch Jul 9, 2019

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