Feature request: Optional chaining operator

[Rosuav]

Steps to reproduce

esprima.parse('foo?.bar')

Expected output

Some indication that this is optional chaining (if foo exists, it's the same as foo.bar, else it's undefined)

Actual output

"Unexpected token ."

Relevant references

https://tc39.es/ecma262/multipage/ecmascript-language-expressions.html#prod-OptionalExpression

This is supported in all major browsers and Node.js.

[jmelvin]

We started using more ES6 syntax recently and also ran into the optional chaining failure. It guess we will have to be more selective until this is supported.

[sergey-v9]

we have had to move to nightly-esprima because of this

[mariocampacci]

it is not implemented (?)
although it seems limited to template literal as suggested by the comment

however I cannot understend why: ES6 shouldn't be handled? 57dc451
and as far as i know the proposal passed

[jogibear9988]

you can also try my esprima fork esprima-next
wich is in es6 and should work with ES6 code
https://github.com/node-projects/esprima-next

[Rosuav]

Does that work with the Python bindings?

[jogibear9988]

don't know

[lmh-justdo]

Object deconstruction like ... not support

[Nefcanto]

we have had to move to nightly-esprima because of this

@sergey-v9 what is that nightly-esprima? I searched it and it takes me back to the esprima repository itself.

[sergey-v9]

@Nefcanto yes, it is the same, but bult from the latest version of the code in this repo from 2021 year (while the official last version was 4.0.1 from 2018 year)