Error: Cannot find module 'webpack/lib/ParserHelpers' (Angular 10)

[GChuf]

Bug report

What is the current behavior?

When running ng serve or ng build (angular) , I get:
Error: Cannot find module 'webpack/lib/ParserHelpers'.

Angular CLI: 10.0.6
Node: 12.18.2
OS: win32 x64


Angular: 10.0.9
... common, compiler, compiler-cli, core, forms
... language-service, localize, platform-browser
... platform-browser-dynamic, router
Ivy Workspace: Yes

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.1000.6
@angular-devkit/build-angular     0.1000.6
@angular-devkit/build-optimizer   0.1000.6
@angular-devkit/build-webpack     0.1000.6
@angular-devkit/core              10.0.6
@angular-devkit/schematics        10.0.6
@angular/cli                      10.0.6
@ngtools/webpack                  10.0.6
@schematics/angular               10.0.6
@schematics/update                0.1000.6
rxjs                              6.6.2
typescript                        3.9.7
webpack                           5.0.0-beta.26

[error] Error: Cannot find module 'webpack/lib/ParserHelpers'
Require stack:
- C:\Work\Angular\ipro-alis-ng10 working version\node_modules\worker-plugin\dist\worker-plugin.js
- C:\Work\Angular\ipro-alis-ng10 working version\node_modules\@angular-devkit\build-angular\src\angular-cli-files\models\webpack-configs\worker.js
- C:\Work\Angular\ipro-alis-ng10 working version\node_modules\@angular-devkit\build-angular\src\angular-cli-files\models\webpack-configs\index.js
- C:\Work\Angular\ipro-alis-ng10 working version\node_modules\@angular-devkit\build-angular\src\browser\index.js
- C:\Work\Angular\ipro-alis-ng10 working version\node_modules\@angular-devkit\architect\node\node-modules-architect-host.js
- C:\Work\Angular\ipro-alis-ng10 working version\node_modules\@angular-devkit\architect\node\index.js
- C:\Work\Angular\ipro-alis-ng10 working version\node_modules\@angular\cli\models\architect-command.js
- C:\Work\Angular\ipro-alis-ng10 working version\node_modules\@angular\cli\commands\build-impl.js
- C:\Work\Angular\ipro-alis-ng10 working version\node_modules\@angular-devkit\schematics\tools\export-ref.js
- C:\Work\Angular\ipro-alis-ng10 working version\node_modules\@angular-devkit\schematics\tools\index.js
- C:\Work\Angular\ipro-alis-ng10 working version\node_modules\@angular\cli\utilities\json-schema.js
- C:\Work\Angular\ipro-alis-ng10 working version\node_modules\@angular\cli\models\command-runner.js
- C:\Work\Angular\ipro-alis-ng10 working version\node_modules\@angular\cli\lib\cli\index.js
- C:\Users\M0119905\AppData\Roaming\npm\node_modules\@angular\cli\lib\init.js
- C:\Users\M0119905\AppData\Roaming\npm\node_modules\@angular\cli\bin\ng
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:966:15)
    at Function.Module._load (internal/modules/cjs/loader.js:842:27)
    at Module.require (internal/modules/cjs/loader.js:1026:19)
    at require (internal/modules/cjs/helpers.js:72:18)
    at Object.<anonymous> (C:\Work\Angular\ipro-alis-ng10 working version\node_modules\worker-plugin\dist\worker-plugin.js:5:37)
    at Module._compile (internal/modules/cjs/loader.js:1138:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1158:10)
    at Module.load (internal/modules/cjs/loader.js:986:32)
    at Function.Module._load (internal/modules/cjs/loader.js:879:14)
    at Module.require (internal/modules/cjs/loader.js:1026:19)
    at require (internal/modules/cjs/helpers.js:72:18)
    at Object.<anonymous> (C:\Work\Angular\ipro-alis-ng10 working version\node_modules\@angular-devkit\build-angular\src\angular-cli-files\models\webpack-configs\worker.js:13:22)
    at Module._compile (internal/modules/cjs/loader.js:1138:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1158:10)
    at Module.load (internal/modules/cjs/loader.js:986:32)
    at Function.Module._load (internal/modules/cjs/loader.js:879:14)

If the current behavior is a bug, please provide the steps to reproduce.

Just install webpack 5.0.0-beta.26 and try to run "ng build".

What is the expected behavior?

No errors. When downgrading to webpack v4, everything works as expected.
(and when bumping to v5 again, the error remains)

Other relevant information:
webpack version: 5.0.0-beta.26
Node.js version: v12.18.2.
Operating System: Windows 10 64bit

I tried:

• reinstalling node_modules
• running npm i [email protected] html-webpack-plugin@latest webpack-dev-server@latest

[alexander-akait]

Please report the issue to angilar-cli

[GChuf]

Done:
angular/angular-cli#18556