TypeError: acorn__WEBPACK_IMPORTED_MODULE_2__.Parser.extend is not a function

[davixyz]

I'm coming from this repo: https://github.com/pedronauck/docz
Which has a dependency tree like this

└─┬ [email protected]
  └─┬ [email protected]
    └── [email protected]  deduped

Once I run my docz app I get:

TypeError: acorn__WEBPACK_IMPORTED_MODULE_2__.Parser.extend is not a function

If we lock to [email protected] everything works again. Any insight?

Here's a repo that can help reproduce the issue
https://github.com/davixyz/docz-issue

[davixyz]

I opened an issue on buble(bublejs/buble#189) but it seems we need to discuss it here. Any way we can update the dependencies?