From 1a16a26ad8821a2100a1e4c61f9a98dc3e312c90 Mon Sep 17 00:00:00 2001
From: Alan Agius <17563226+alan-agius4@users.noreply.github.com>
Date: Wed, 4 Mar 2026 13:17:03 +0000
Subject: [PATCH] fix(@angular/build): treat empty browsers array as undefined
 in unit-test builder

Ensure that an empty `browsers` array is treated as `undefined` during
the option normalization process. This allows the unit-test builder to
properly fall back to the Node.js/jsdom environment for Vitest, and
allows the Karma runner to use its default configuration.

Closes #32652
---
 packages/angular/build/src/builders/unit-test/options.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/angular/build/src/builders/unit-test/options.ts b/packages/angular/build/src/builders/unit-test/options.ts
index 72b5f3eb3e8d..0a71f2d642f1 100644
--- a/packages/angular/build/src/builders/unit-test/options.ts
+++ b/packages/angular/build/src/builders/unit-test/options.ts
@@ -116,7 +116,7 @@ export async function normalizeOptions(
     buildProgress: progress,
     reporters: normalizeReporterOption(options.reporters),
     outputFile: options.outputFile,
-    browsers,
+    browsers: browsers?.length ? browsers : undefined,
     browserViewport: width && height ? { width, height } : undefined,
     watch,
     debug: options.debug ?? false,