Something weird with spdx

[conartist6]

I'm making this issue in case anyone else comes across this problem. I have no idea what I'm seeing yet, but will post more updates as I investigate.

$ yarn jest
# snip
    Cannot find module 'spdx-license-ids' from 'node_modules/spdx-expression-parse/scan.js'

    Require stack:
      node_modules/spdx-expression-parse/scan.js
      node_modules/spdx-expression-parse/index.js
      node_modules/validate-npm-package-license/index.js
      node_modules/normalize-package-data/lib/fixer.js
      node_modules/normalize-package-data/lib/normalize.js
      node_modules/read-pkg/index.js
      node_modules/read-pkg-up/index.js
      babel/plugins/self-import.cjs
      node_modules/@babel/core/lib/config/files/plugins.js
      node_modules/@babel/core/lib/config/files/index.js
      node_modules/@babel/core/lib/index.js
      node_modules/babel-plugin-tester/dist/plugin-tester.js
      node_modules/babel-plugin-tester/dist/index.js

The weird thing is that it seems to only happen in a branch I'm working on... But I can't figure out what's different in the branch. Nothing relevant as far as I can tell. I removed a single devDependency from package.json. If I go to the main branch it works. If I go to the other branch (oddly called __ though I don't see how that would be relevant) it fails. The branch makes the difference even if I don't run yarn. I did rm -rf node_modules && yarn but that didn't fix it. I did jest --clearCache but that had no effect.

$ yarn --version
1.22.10
$ node --version
v15.2.1

[conartist6]

Ah I think I somehow cause babel to transpile something it shouldn't.

[conartist6]

Hmm no I still don't quite understand how I got that error message. Somebody somewhere is doing something impure. What? I don't know. But I discovered that I can just pass {normalize: false} and that bypasses the problem.