Optional chaining support

Does UXP support optional chaining? How can it be configured?

It does support. It has nothing to do with UXP - it’s plain JS and no config is needed. I use it my plugins

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In UXP you can look for UXP version: require("uxp").versions.uxp

Then you can look into changelog: https://blog.developer.adobe.com/big-updates-coming-to-uxp-3185f0e47130 to see V8 version. (v9.4.146.24)

And then you can go into V8 release notes to see when it was added: V8 release v8.0 · V8 (v8.0)