Update Optional Chaining documentation to reflect the return from undefined to true

[mpaarating]

Per babel/babel#10805 and the subsequent PR , When using optional delete to delete a property of a nullish base, the delete operation returns now returns true. Should a distinction be made in the docs to support this change?

If so, I can make the corresponding change to the documentation.

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[JLHwung]

@mpaarating Good catch! PR's welcome!

[mpaarating]

Great, I'll start working on this ASAP!

[mpaarating]

@JLHwung After looking into the docs for @babel/plugin-proposal-optional-chaining, there isn't a mention of what the current behavior is (undefined return for nullish base). As such, I don't think that additional documentation need to be added. What are your thoughts?

[JLHwung]

@mpaarating I think it will be great to add a section like delete nested properties because the behaviour is changed after 7.8 (to be aligned to the spec) and people may reply on the old behaviour. So it should be clarified in the docs.