Optional chaining et al

[dy]

Browsers already support optional chaining, but rollup doesn't recognize the syntax:

[!] Error: Unexpected token
$.js (18:30)
16:         if (target.nodeType !== ELEMENT) return
17:         ;[target.classList.contains(SPECT_CLASS) ? target : null, ...target.getElementsByClassName(SPECT_CLASS)]
18:         .forEach(node => node?.[_spect].forEach(set => set.delete(node)))
                                  ^
19:       })
Error: Unexpected token
    at error (C:\projects\spect\node_modules\rollup\dist\shared\rollup.js:10120:30)

What's the right way to handle that? Hoped to avoid babel plugin.

[keithamus]

@dy you might want to follow acornjs/acorn#891 which adds optional chaining to Acorn, the underlying parser rollup uses. Support for this will likely be blocked until Acorn gets it.

[lukastaegert]

This is available now in Rollup v2.11.0 via #3582