Error in PostCSS + tailwind doesn't break the build

[noguespi]

Command

build

Is this a regression?

• Yes, this behavior used to work in the previous version

The previous version in which this bug was not present was

No response

Description

With postcss + tailwind, when I have an error in a css file, it displays a big red error in the logs, but the build continue and is done successfuly.

Minimal Reproduction

Steps to reproduce:

• create a new angular project with default options.
• npm install tailwindcss @tailwindcss/postcss postcss --force
• create the .postcssrc.json with

{
  "plugins": {
    "@tailwindcss/postcss": {}
  }
}

• add the follwing in the css of a component @reference "not-found.css";
• npm run build

The error is displayed but the build continue and is successful.

Exception or Error

Your Environment

Angular CLI: 20.0.3
Node: 20.19.2
Package Manager: npm 11.4.1
OS: linux x64

Angular: 20.0.4
... common, compiler, compiler-cli, core, forms
... platform-browser, router

Package                      Version
------------------------------------------------------
@angular-devkit/architect    0.2000.3
@angular-devkit/core         20.0.3
@angular-devkit/schematics   20.0.3
@angular/build               20.0.3
@angular/cli                 20.0.3
@schematics/angular          20.0.3
rxjs                         7.8.2
typescript                   5.8.3

Anything else relevant?

No response

[alan-agius4]

This issue isn't caused by the Angular CLI it's due to Tailwind CSS. As the error isn't passed to PostCSS.