help locating the source of "Bundling Warning EVAL"

Stencil version:

 @stencil/core@2.4.0

I'm submitting a:

[ ] bug report [x] feature request [ ] support request => Please do not submit support requests here, use one of these channels: https://stencil-worldwide.herokuapp.com/ or https://forum.ionicframework.com/

Current behavior: Stencil displays :

[ WARN ] Bundling Warning EVAL Use of eval is strongly discouraged, as it poses security risks and may cause issues with minification

Expected behavior:

[ WARN ] Bundling Warning EVAL in module/file node_modules/unknown/path/mysterious.js Use of eval is strongly discouraged, as it poses security risks and may cause issues with minification

Other information: Happened after installing https://www.npmjs.com/package/pdfjs-dist , which has a bunch of dependencies

a text search of "eval" didn't return any result, so I think the reference is more tricky ...