Parcel: Build error with Ava unit testing for Node.js project

[rajinder-yadav]

🐛 bug report

Unable to build and run Ava unit test using Parcel.
The issue seems to be that a JavaScript module file will fail, but a Node.js module file will build and run.

I've included a sample test project to show this problem:

https://github.com/rajinder-yadav/ava-parcel-test

To see the error, install the NPM modules and run the test

1. npm install
1. npm test

Open file utils.js and read comment for further investigation clues.

🔦 Context

I am unable to run all my Node.js unit test using Ava.

Make sure to read comment in code for clues.

💻 Code Sample

See top!

🌍 Your Environment

| Software | Version(s) |
| ---------------- | ---------- |
| Parcel | "^1.10.3"
| Node | v10.11.0
| npm/Yarn | 6.4.1
| Operating System | Linux 4.15.0-38-generic

[rajinder-yadav]

Is anyone looking at this bug? This would be really nice to have working.

[daniellacosse]

Did you ever figure this out? I think I'm running into this issue now

[mischnic]

Could someone provide a reproduction? The repo in the original post was deleted.

[daniellacosse]

Yeah, which is why I'm not super certain if this is the same as my issue.

If you pull down https://github.com/daniellacosse/accounting-cli/tree/makefile-2 and run make test the tests pass but you get the following output in each of the built files:

 .../dist/trello-scripts/__tests__/label-rollup.test.js:110

   109:   }                                                
   110:                                                    
   111:   // Override the current require with this new one

  ReferenceError: parcelRequire is not defined

  parcelRequire.rl8J (dist/trello-scripts/__tests__/label-rollup.test.js:110:17)
  Object.<anonymous> (dist/trello-scripts/__tests__/label-rollup.test.js:118:2)

could be related to https://github.com/parcel-bundler/parcel/issues/1159 ?

[mischnic]

It seems like ava executes the file as an ES module.

@devongovett, related the the ES modules discussion: #2839

[engineforce]

Hi parcel team, globalThis may solve this issue.

[github-actions[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed in 14 days if no further activity occurs.

[joshwilsonvu]

Bumping this as jest has the same issue and it would be nice for builds to be able to run in strict mode.