fix member expression completions

[zardoy]

e.g. arr.len|, seems it was broken for years

fixes microsoft/vscode#168021

[zardoy]

though there is still no completions for ["|"] (would be useful for number props)

[connor4312]

Took me a lil to grok but it looks okay. I think the main thing is just using estraverse's parent since the current implementation could incorrectly pass the parent as the previous sibling node.

[zardoy]

I think the main thing is just using estraverse's parent since the current implementation could incorrectly pass the parent as the previous sibling node.

But it is inside of the asAcorn.start < offset && offset <= asAcorn.end check. Anyway, it was easy to change. Btw thank you for the quick reply!