fix: handle function-based Vitest configs in coverage plugin

Author: AS

.gitignore

@@ -48,3 +48,6 @@ Thumbs.db
 
 # Nx workspace cache
 .nx
+
+# Bundled Vitest configuration files
+**/*.bundled_*.mjs

packages/core/vitest.int.config.ts

@@ -14,7 +14,6 @@ export default defineConfig(() => {
       setupFiles: [
         '../../testing/test-setup/src/lib/console.mock.ts',
         '../../testing/test-setup/src/lib/reset.mocks.ts',
-        '../../testing/test-setup/src/lib/portal-client.mock.ts',
       ],
       coverage: {
         ...baseConfig.test.coverage,

packages/plugin-coverage/src/lib/nx/coverage-paths.ts

@@ -128,11 +128,19 @@ export async function getCoveragePathForVitest(
     );
   }
 
-  const vitestConfig = await importModule<VitestCoverageConfig>({
+  const vitestConfigModule = await importModule<
+    VitestCoverageConfig & { default?: unknown }
+  >({
     filepath: config,
     format: 'esm',
   });
 
+  const vitestConfig = await extractVitestConfig(
+    vitestConfigModule,
+    target,
+    project.name || 'unknown',
+  );
+
   const reportsDirectory =
     options.reportsDirectory ?? vitestConfig.test.coverage?.reportsDirectory;
   const reporter = vitestConfig.test.coverage?.reporter;
@@ -158,6 +166,28 @@ export async function getCoveragePathForVitest(
   };
 }
 
+async function extractVitestConfig(
+  vitestConfigModule: VitestCoverageConfig & { default?: unknown },
+  target: string,
+  projectName: string,
+): Promise<VitestCoverageConfig> {
+  if (typeof vitestConfigModule.default === 'function') {
+    try {
+      const result = vitestConfigModule.default();
+      if (result && typeof result === 'object' && result.test?.coverage) {
+        return result as VitestCoverageConfig;
+      }
+      throw new Error('Function export did not return valid configuration');
+    } catch (error) {
+      throw new Error(
+        `Could not execute Vitest config function for target ${target} in project ${projectName}: ${error}`,
+      );
+    }
+  }
+
+  return vitestConfigModule;
+}
+
 export async function getCoveragePathForJest(
   options: JestExecutorOptions,
   project: ProjectConfiguration,