fix(material/schematics): theming API migration not working with CRLF line endings (#29171)

Fixes that the migration didn't account for CRLF line endings when figuring out the Sass namespace.

Fixes #29147.

Author: crisbeto

src/material/schematics/ng-update/migrations/m2-theming-v18/migration.ts

@@ -271,7 +271,7 @@ function extractNamespaceFromUseStatement(fullImport: string): string {
 function getNamespaces(moduleName: string, content: string): string[] {
   const namespaces = new Set<string>();
   const escapedName = moduleName.replace(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1');
-  const pattern = new RegExp(`@use +['"]${escapedName}['"].*;?\n`, 'g');
+  const pattern = new RegExp(`@use +['"]${escapedName}['"].*;?\\r?\\n`, 'g');
   let match: RegExpExecArray | null = null;
 
   while ((match = pattern.exec(content))) {

src/material/schematics/ng-update/test-cases/m2-theming.spec.ts

@@ -309,4 +309,46 @@ describe('M2 theming migration', () => {
       `@include matx.something-not-theming-related();`,
     ]);
   });
+
+  it('should migrate usages of the M2 theming APIs in a file with CRLF endings', async () => {
+    const result = await setup(
+      [
+        `@use '@angular/material' as mat;`,
+
+        `$my-primary: mat.define-palette(mat.$indigo-palette, 500);`,
+        `$my-accent: mat.define-palette(mat.$pink-palette, A200, A100, A400);`,
+        `$my-warn: mat.define-palette(mat.$red-palette);`,
+
+        `$my-theme: mat.define-light-theme((`,
+        `  color: (`,
+        `    primary: $my-primary,`,
+        `    accent: $my-accent,`,
+        `    warn: $my-warn,`,
+        `  ),`,
+        `  typography: mat.define-typography-config(),`,
+        `  density: 0,`,
+        `));`,
+        `@include mat.all-component-themes($my-theme);`,
+      ].join('\r\n'),
+    );
+
+    expect(result.split('\r\n')).toEqual([
+      `@use '@angular/material' as mat;`,
+
+      `$my-primary: mat.m2-define-palette(mat.$m2-indigo-palette, 500);`,
+      `$my-accent: mat.m2-define-palette(mat.$m2-pink-palette, A200, A100, A400);`,
+      `$my-warn: mat.m2-define-palette(mat.$m2-red-palette);`,
+
+      `$my-theme: mat.m2-define-light-theme((`,
+      `  color: (`,
+      `    primary: $my-primary,`,
+      `    accent: $my-accent,`,
+      `    warn: $my-warn,`,
+      `  ),`,
+      `  typography: mat.m2-define-typography-config(),`,
+      `  density: 0,`,
+      `));`,
+      `@include mat.all-component-themes($my-theme);`,
+    ]);
+  });
 });