bug(@angular/material-experimental): Undefined variable $m3-spring-green-palette

[mkurcius]

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

$m3-spring-green-palette is not exported from @angular/material-experimental/_index.scss
bc of it it variable is used, during build error "Undefined variable." is thrown

Current _index.scss contains only

@forward './theming/m3-palettes' as m3-* show $m3-red-palette, $m3-green-palette, $m3-blue-palette,
  $m3-yellow-palette, $m3-cyan-palette, $m3-magenta-palette, $m3-orange-palette,
  $m3-chartreuse-palette, $m3-azure-palette, $m3-violet-palette, $m3-rose-palette;

Reproduction

StackBlitz link: https://stackblitz.com/edit/stackblitz-starters-ngybdw?file=src%2Fglobal_styles.scss
Steps to reproduce:

1. add @use "@angular/material-experimental" as matx
2. try to access matx.$m3-spring-green-palette

Expected Behavior

$m3-spring-green-palette should be exported and no errors during build

Actual Behavior

✘ [ERROR] Undefined variable. error

Environment

Angular CLI: 17.3.5
Node: 20.9.0
Package Manager: npm 10.5.0
OS: win32 x64

Angular: 17.3.5
... animations, cdk, cli, common, compiler, compiler-cli, core
... forms, material, material-experimental, platform-browser
... platform-browser-dynamic, router, service-worker

Package Version

@angular-devkit/architect 0.1703.5
@angular-devkit/build-angular 17.3.5
@angular-devkit/core 17.3.5
@angular-devkit/schematics 17.3.5
@angular/fire 17.0.1
@schematics/angular 17.3.5
ng-packagr 17.3.0
rxjs 7.8.1
typescript 5.4.5
zone.js 0.14.4