Broken path resolution for styles on dev-server when using `outputHashing` option

[vladzavadsky]

Command

serve

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

^18.0.0

Description

After update to v19, FOUC was noticed, which only happens when using @angular-devkit/build-angular:dev-server and is not reproduced on a production build. FOUC is also visible when "outputHashing": "none" is used, but with no errors in the console.

Minimal Reproduction

1. Create a new project with ng new <app-name> using @next version of @angular/cli
2. Add "outputHashing": "all" in angular.json
3. Start an application with npm run start
4. Open browser's console to see an error

Exception or Error

Refused to apply style from '<URL>' because its MIME type ('text/html') is not a supported stylesheet MIME type, and strict MIME checking is enabled.

Your Environment

Node: 22.2.0
Package Manager: npm 10.8.1
OS: darwin arm64

Angular: 19.0.0-next.11
... animations, common, compiler, compiler-cli, core, forms
... platform-browser, platform-browser-dynamic, platform-server
... router

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1900.0-next.13
@angular-devkit/build-angular   19.0.0-next.13
@angular-devkit/core            19.0.0-next.13
@angular-devkit/schematics      19.0.0-next.13
@angular/cli                    19.0.0-next.13
@angular/ssr                    19.0.0-next.13
@schematics/angular             19.0.0-next.13
rxjs                            7.8.1
typescript                      5.6.3
zone.js                         0.15.0

Anything else relevant?

No response

[alan-agius4]

Thanks for reporting this issue. Luckily, it has already been fixed via #28709

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