Build with css modules fails with unexpected undefined

[dmitrijs-balcers]

I'm not really sure why, but on this project: https://github.com/dmitrijs-balcers/react-css-modules-typescript-boilerplate

When I run yarn build I get the following exception:

@parcel/workers: Got unexpected undefined

  Error: Got unexpected undefined
  at nullthrows (/project/node_modules/nullthrows/nullthrows.js:7:15)
  at processCSSModule (/project/node_modules/@parcel/packager-css/lib/CSSPackager.js:187:67)
  at async PromiseQueue._runFn (/project/node_modules/@parcel/utils/lib/PromiseQueue.js:88:7)
  at async PromiseQueue._next (/project/node_modules/@parcel/utils/lib/PromiseQueue.js:75:5)

Specifically it fails here.

Is this sort of exceptions known, and perhaps there is something missing in config?
If I run yarn start then all works as expected.

[dmitrijs-balcers]

This seems relevant: #5789, #5803

[dmitrijs-balcers]

OK it seems that actually the problem is with the transformer library I'm using parcel-transformer-ts-css-modules, as this is working file: https://github.com/dmitrijs-balcers/parcel/commit/5bf06fe9c3d00b10eba5431c6e6ac527c5bebfaa

I just don't know yet why does that transformer library causes throw on parcel build but not on parcel serve...

[dmitrijs-balcers]

I don't know why but if this transformer runs https://github.com/dmitrijs-balcers/parcel-transformer-ts-css-modules/blob/master/lib/index.js, then astKey is null in CommittedAsset of *.module.css

[dmitrijs-balcers]

Fixed by changing order of transformers in .parcelrc, lol.
dmitrijs-balcers/react-css-modules-typescript-boilerplate@59a6ee3