Module not found: Error: Can't resolve 'worker-loader'

[BrennanDuffey]

Attach (recommended) or Link to PDF file here: Not an issue while interacting with a pdf this is a webpack error when compiling

Configuration:

• Web browser and its version: N/A
• Operating system and its version: Happening on a Linux box
• PDF.js version: Issue occurs on pdfjs-dist: 2.4.456 The fix I made was using the version I originally used at 2.2.228
• Is a browser extension: No

Steps to reproduce the problem:

1. The import looks like this on webpack version 4.41.2
   import PDFJS from 'pdfjs-dist/webpack';

What is the expected behavior? Application compiles correctly

What went wrong? error occurs during build "Module not found: Error: Can't resolve 'worker-loader'"

It's entirely possible this is not how the pdfjs-dist was supposed to be used I ended up using that over just pdfjs since I needed it to work on IE and chrome sets up the worker for me without the dist package

[Snuffleupagus]

What went wrong? error occurs during build "Module not found: Error: Can't resolve 'worker-loader'"

Did you actually install the worker-loader package, since that needs to be done manually?

Does this example work, since it's not clear (to me at least) if you tried using it?

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Finally, it's unlikely that anyone will be able to help without more context; hence please see https://github.com/mozilla/pdf.js/blob/master/.github/CONTRIBUTING.md (emphasis mine):

If you are developing a custom solution, first check the examples at https://github.com/mozilla/pdf.js#learning and search existing issues. If this does not help, please prepare a short well-documented example that demonstrates the problem and make it accessible online on your website, JS Bin, GitHub, etc. before opening a new issue or contacting us in the Matrix room -- keep in mind that just code snippets won't help us troubleshoot the problem.

[Maxchii]

We're been experiencing the same issue after the latest update!

In our production build we get a o is not a constructor error on runtime.
We've tracked it down to pdfjs.GlobalWorkerOptions.workerPort = new PdfjsWorker(); in /pdfjs-dist/webpack.js.
Currently importing pdfjs-dist classes such as getDocument crashes our app on runtime.

We've made sure worker-loader is installed.

Does anyone have a workaround?

[Maxchii]

We found our issue. We were using worker-loader 3.0.1 which is a new major version. Switching to 2.0.0 resolved our problem.