Module not found: Error: Can't resolve 'babel-runtime/regenerator'

[kozubikmichal]

Hi,

I'm facing build error propably due to babel versions conflict.

This is output from Webpack:

ERROR in ./node_modules/pdfjs-dist/lib/web/ui_utils.js
Module not found: Error: Can't resolve 'babel-runtime/regenerator' in 'C:\Users\******\repos\la_client\node_modules\pdfjs-dist\lib\web'
 @ ./node_modules/pdfjs-dist/lib/web/ui_utils.js 29:19-55
 @ ./node_modules/pdfjs-dist/lib/web/pdf_link_service.js
 @ ./node_modules/react-pdf/dist/LinkService.js
 @ ./node_modules/react-pdf/dist/Document.js
 @ ./node_modules/react-pdf/dist/entry.js

I found this issue mozilla/pdf.js#10280 so if I get it right this will be fixed with new version of pdfjs-dist.
But according to info/issues on react-pdf project it seems that for some people it is already working now with pdfjs-dist 2.0.943. Is there any additional step to make this working?

Environment

• React-PDF version: 4.0.0
• React version: 16.6.3
• Webpack version: 4.26.1

Regards
Michal

[wojtekmaj]

I guess you could npm i babel-runtime or yarn add babel-runtime in the meantime, which would add the missing module and stop the error from happening. I updated pdfjs-dist to Babel 7 in mozilla/pdf.js#10293. Babel 6 or 7 though, doesn't really matter, I think this means babel-runtime is required by pdfjs-dist and as such should be listed in dependencies.

For the time being, babel-runtime may be listed as React-PDF dependency to prevent that error from happening.

[wojtekmaj]

I notified Mozilla about missing dependency in mozilla/pdf.js#10280.

[rogordan]

I have a similar issue. If I add babel-runtime manually it causes an issue with duplicate packages because there is babel-runtime/regenerator and @babel/runtime/regenerator. My build only succeeded when I went into pdfjs and manually pasted the path to my @babel/runtime/regenerator. I think the less hacky hack would be to use webpack aliasing to resolve the right runtime-regenerator, but I can't figure that out.

I guess I'm wondering if there's some other way to address this.

[wojtekmaj]

Hi all,
this should be fixed with the next minor release (after 4.0.1)
We're waiting for Mozilla to release pdf.js 2.1.x (mozilla/pdf.js#10416) to have this fixed.
Thanks for your patience.

[ebongso]

Thanks @wojtekmaj. We encountered the same issue today and did npm i --save-dev babel-runtime. The problem was resolved.

[allanchua101]

We also experienced same issue today. Using npm i --save-dev babel-runtime fixes the problem, but is it the best way to work around it?

[wojtekmaj]

@allanchua101 that is the best way to work around it ;) Mozilla is about to release a new version of PDF.js though, so this workaround should no longer be needed soon.

[wojtekmaj]

All, React-PDF 4.0.3 is out and should have this issue resolved.

[sensoeurn]

****** My error :

This dependency was not found:

• babel-runtime/regenerator in ./node_modules/pdfjs-dist/lib/web/ui_utils.js

To install it, you can run: npm install --save babel-runtime/regenerator

****** after I run the commad => npm i --save-dev babel-runtime

It works for me