parcel: Build without HMR fails with 'is not a function' type error

🐛 bug report

🎛 Configuration (.babelrc)

{
  "presets": [
    "env",
    "react"
  ]
}

🤔 Expected Behavior

Should work with production built or without HMR (parcel serve --no-hmr) the same as with HMR built.

😯 Current Behavior

After switching for cerebral-realworld-example-app from create-react-app to parcel I got a problem with the production build. With CRA and also with parcel developement build with HMR everything works fine, but when loading a production build or development build without HMR I get the following error:

react-dom.development.js:242 Uncaught TypeError: (0 , w.redirectToSignal) is not a function
    at Object.parcelRequire.113.cerebral (react-dom.development.js:242)
    at u (react-dom.development.js:1)
    at a (react-dom.development.js:1)
    at Object.parcelRequire.112.cerebral (react.development.js:180)
    at u (react-dom.development.js:1)
    at a (react-dom.development.js:1)
    at Object.parcelRequire.76.cerebral (react.development.js:136)
    at u (react-dom.development.js:1)
    at a (react-dom.development.js:1)
    at Object.parcelRequire.29.cerebral (react-dom.development.js:292)
parcelRequire.113.cerebral @ react-dom.development.js:242
u @ react-dom.development.js:1
a @ react-dom.development.js:1
parcelRequire.112.cerebral @ react.development.js:180
u @ react-dom.development.js:1
a @ react-dom.development.js:1
parcelRequire.76.cerebral @ react.development.js:136
u @ react-dom.development.js:1
a @ react-dom.development.js:1
parcelRequire.29.cerebral @ react-dom.development.js:292
u @ react-dom.development.js:1
a @ react-dom.development.js:1
parcelRequire.9.cerebral @ react-dom.development.js:294
u @ react-dom.development.js:1
a @ react-dom.development.js:1
parcelRequire.7.react @ react-dom.development.js:402
u @ react-dom.development.js:1
parcelRequire.43 @ react-dom.development.js:1
(anonymous) @ react-dom.development.js:1

You can see that error live when opening http://conduit.yacoma.it/#/. After removing all instances of redirectToSignal the app loads also fine for production. BUT for the TestApp which also uses redirectToSignal the production build loads also fine. So I was not able to isolate the issue.

💁 Possible Solution

Don’t know as I was not able to isolate the issue.

💻 Code Sample

The instance of redirectToSignal which errors now you can find here. But when removing this one the next instance errors.

In the test_parcel branch I have removed all instances of redirectToSignal and it loads fine.

I created a TestApp which also uses redirectToSignal to isolate the problem, but surprisingly it loads fine.

🌍 Your Environment

Software	Version(s)
Parcel	1.7.0
Node	8.11.1
npm	5.8.0
Operating System	Linux Debian Stretch