Parcel: --experimental-scope-hoisting breaks project using rebass

[midnightcodr]

Choose one: a 🐛 bug report

🎛 Configuration (.babelrc, package.json, cli command)

Please see https://gist.github.com/midnightcodr/fbcfc63ab80951b3f13b330b0ec1f406

{
  "presets": [
    "env",
    "react"
  ],
  "plugins": [
    "transform-object-rest-spread",
    "transform-class-properties"
  ]
}

🤔 Expected Behavior

If I build the project without --experimental-scope-hoisting, everything works as expected. But with the option on, when serving the site, I am getting

In the browser console and a blank page.

😯 Current Behavior

It should render a page with "Hello React!" and no js error.

💁 Possible Solution

🔦 Context

💻 Code Sample

Please see https://gist.github.com/midnightcodr/fbcfc63ab80951b3f13b330b0ec1f406

🌍 Your Environment

| Software | Version(s) |
| ---------------- | ---------- |
| Parcel |1.12.3
| Node |10.15.3
| npm/Yarn |6.4.1
| Operating System |Ubuntu 19.04

[devongovett]

This is due to a missing __esModule flag that babel uses for interop between common JS and ES6 modules. I made a commit to the Parcel 2 tree shaking branch that fixes this: https://github.com/parcel-bundler/parcel/pull/2967/commits/ab98afe2ba3dcf2a8978580cd119ded770212fc5. Will need to be back ported.

[devongovett]

Should be fixed by #2993.

[midnightcodr]

How can I start using the version with your fix @devongovett ?