styles.css - Error: (0 , _identifier.getUndoPath) is not a function, after ng server/build with Nx workspace

🐞 Bug report

Command (mark with an x)

• new
• build
• serve
• test
• e2e
• generate
• add
• update
• lint
• extract-i18n
• run
• config
• help
• version
• doc

Is this a regression?

Yes, the previous version in which this bug was not present was: 12.1.0

Description

I generate a new Nx workspace (12.7.2) with Angular (12.1.0).

After updating ng from 12.1.0 to 12.2.2 I’m get the error Error: (0 , _identifier.getUndoPath) is not a function after run ng server or ng build.

Also, I removed execute ng from nx and delete "postinstall": "node ./decorate-angular-cli.js && ngcc --properties es2015 browser module main" from package.json.

🔬 Minimal Reproduction

https://github.com/AwesomeObserver/ng-styles-bug

🔥 Exception or Error

// with ng server
styles.css - Error: (0 , _identifier.getUndoPath) is not a function
// with ng build
styles.c331d6dc3ee8f876a7f8.css - Error: (0 , _identifier.getUndoPath) is not a function

🌍 Your Environment

Angular CLI: 12.2.2
Node: 14.15.0
Package Manager: npm 6.14.8
OS: win32 x64

Angular: 12.2.2
... animations, cli, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1202.2
@angular-devkit/build-angular   12.2.2
@angular-devkit/core            12.1.4
@angular-devkit/schematics      12.1.4
@schematics/angular             12.1.4
rxjs                            6.6.7
typescript                      4.3.5

Anything else relevant?

[npalacio]

Installing mini-css-extract-plugin@2.2.1 to my dev dependencies fixed this issue for me

[Burgov]

Installing mini-css-extract-plugin@2.2.1 to my dev dependencies fixed this issue for me

This fixed it for me too, thanks!