pdfjs-dist npm update from 2.0.489 to 2.0.943 causes webpack error: Can't resolve 'babel-runtime/regenerator'

After updating our npm package for pdfjs-dist from 2.0.489 to 2.0.943, webpack fails to build. If we downgrade back to version 2.0.489 all is well again and the errors go away.

Here’s a copy of the webpack build log showing the failures:

 10% building 1/1 modules 0 activei ｢wds｣: Project is running at http://localhost:8081/
i ｢wds｣: webpack output is served from /
i ｢wds｣: Content not from webpack is served from C:\xxxxxx\Website\dist                                                                                                                                                                                                                                                                                                                                                         × ｢wdm｣:    2471 modules
ERROR in ./node_modules/pdfjs-dist/lib/core/pdf_manager.js
Module not found: Error: Can't resolve 'babel-runtime/regenerator' in 'C:\xxxxxx\Website\node_modules\pdfjs-dist\lib\core'

ERROR in ./node_modules/pdfjs-dist/lib/core/evaluator.js
Module not found: Error: Can't resolve 'babel-runtime/regenerator' in 'C:\xxxxxx\Website\node_modules\pdfjs-dist\lib\core'

ERROR in ./node_modules/pdfjs-dist/lib/core/obj.js
Module not found: Error: Can't resolve 'babel-runtime/regenerator' in 'C:\xxxxxx\Website\node_modules\pdfjs-dist\lib\core'

ERROR in ./node_modules/pdfjs-dist/lib/display/fetch_stream.js
Module not found: Error: Can't resolve 'babel-runtime/regenerator' in 'C:\xxxxxx\Website\node_modules\pdfjs-dist\lib\display'

ERROR in ./node_modules/pdfjs-dist/lib/display/network.js
Module not found: Error: Can't resolve 'babel-runtime/regenerator' in 'C:\xxxxxx\Website\node_modules\pdfjs-dist\lib\display'

ERROR in ./node_modules/pdfjs-dist/lib/display/node_stream.js
Module not found: Error: Can't resolve 'babel-runtime/regenerator' in 'C:\xxxxxx\Website\node_modules\pdfjs-dist\lib\display'

ERROR in ./node_modules/pdfjs-dist/lib/display/transport_stream.js
Module not found: Error: Can't resolve 'babel-runtime/regenerator' in 'C:\xxxxxx\Website\node_modules\pdfjs-dist\lib\display'

ERROR in ./node_modules/pdfjs-dist/lib/shared/message_handler.js
Module not found: Error: Can't resolve 'babel-runtime/regenerator' in 'C:\xxxxxx\Website\node_modules\pdfjs-dist\lib\shared'

ERROR in ./node_modules/pdfjs-dist/lib/web/ui_utils.js
Module not found: Error: Can't resolve 'babel-runtime/regenerator' in 'C:\xxxxxx\Website\node_modules\pdfjs-dist\lib\web'
i ｢wdm｣: Failed to compile.

Configuration:

• Chrome: latest
• Windows 10 Professional: Latest updates
• PDF.js version: 2.0.943
• Is a browser extension: No

What is the expected behavior? (add screenshot) For the webpack build to succeed.

What went wrong? (add screenshot) The webpack build fails, citing errors in the pdfjs-dist npm package for: Module not found: Error: Can't resolve 'babel-runtime/regenerator'

Package.json excerpt follows:

{
 ...
 "engines": {
    "node": ">= 8.9.0"
  },
  "private": true,
  "devDependencies": {
    "@babel/core": "^7.1.6",
    "@babel/plugin-proposal-class-properties": "^7.1.0",
    "@babel/plugin-syntax-dynamic-import": "^7.0.0",
    "@babel/preset-env": "^7.1.6",
    "babel-eslint": "^10.0.1",
    "babel-loader": "^8.0.4",
    "clean-webpack-plugin": "^1.0.0",
    "copy-webpack-plugin": "^4.6.0",
    "css-loader": "^1.0.1",
    "eslint": "^5.9.0",
    "file-loader": "^2.0.0",
    "html-loader": "^0.5.5",
    "html-webpack-plugin": "^3.2.0",
    "http-server": "^0.11.1",
    "less": "^3.8.1",
    "less-loader": "^4.1.0",
    "mini-css-extract-plugin": "^0.4.4",
    "optimize-css-assets-webpack-plugin": "^5.0.1",
    "style-loader": "^0.23.1",
    "webpack": "^4.26.0",
    "webpack-cli": "^3.1.2",
    "webpack-dev-server": "^3.1.10"
  },
  "dependencies": {
    "@babel/polyfill": "^7.0.0",
    "bootstrap": "^3.3.7",
    "font-awesome": "^4.7.0",
    "jquery": "^3.3.1",
    "jquery-ui": "^1.12.1",
    "moment": "^2.22.2",
    "pdfjs-dist": "^2.0.943",
    "popper.js": "^1.14.5",
    "uuid": "^3.3.2",
    "whatwg-fetch": "^3.0.0"
  }
}

[wojtekmaj]

@timvandermeij Babel 6 or 7, doesn’t really matter. If your code requires something, it should have it listed as a dependency. As such, I consider all currently released versions as faulty in that matter, and I suggest to add @babel/runtime as a dependency of pdfjs-dist. Another idea is to get rid of @babel/runtime dependency (probably the best approach). May you consider reopening this?

[Snuffleupagus]

The versions at https://github.com/mozilla/pdfjs-dist/tree/master/build and https://github.com/mozilla/pdfjs-dist/tree/master/web are still version 2.0.489 at the time of this writing and this version is devoid from the issue I was reporting here.

See https://github.com/mozilla/pdfjs-dist/releases for the latest version, the other problem described here (non-updating master branch) is being tracked in issue #10391.

Assuming @Snuffleupagus means that we should be using the pdfjs-dist version over pdfjs

That’s not what https://github.com/mozilla/pdf.js/issues/10280#issuecomment-443536299 implies; rather it just points out that if you are using https://github.com/mozilla/pdfjs-dist, then you should (in general) use the files found in the build and web folders (and not the ones in the lib folder).