Add support for the duplicate named capturing groups proposal #14805
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PR: New Feature 🚀
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Build successful! You can test your changes in the REPL here: https://babeljs.io/repl/build/52849/ |
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Sweet, LGTM!
Yeah, I'm still catching up on stuff from the meeting, sorry. |
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| ) { | ||
| // If we only transformed named groups because we want to transform duplicates | ||
| // but there are no duplicates, re-transform the regexp without transforming | ||
| // named groups. |
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Can regexpu-core support transforming duplicate named capture groups only? I think it would be useful even out of Babel's scope. And it benefits us, too: we don't have to re-run regexpu-core.
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If transform (?<a>)|(?<a>)(?<b>) to ()|()(?<b>) and then add an a property to the .groups object in our helper, we get Object.keys(groups) == ["b", "a"] instead of ["a", "b"] 🙁
I can add a check on the regexp before calling regexpu-core that skips the transform if we are sure that there are no duplicates.
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Does this plugin need to be added to |
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Yes! Thanks for the reminder. |
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Transform plugin for https://github.com/tc39/proposal-duplicate-named-capturing-groups, that reached consensus for Stage 3 in the July meeting (@bakkot the readme needs to be updated!)