From 6fb0e0baa4da1d44ce0095d7d1c18e0e54a00a5a Mon Sep 17 00:00:00 2001
From: Alan Agius <17563226+alan-agius4@users.noreply.github.com>
Date: Tue, 8 Apr 2025 07:03:01 +0000
Subject: [PATCH] fix(@angular/build): properly resolve transitive external
 dependencies in vite-dev-server

This fix ensures that transitive external dependencies are correctly recognized and excluded during development builds with the Vite dev server. Previously, some dependencies were mistakenly bundled.

Closes #30048
---
 .../angular/build/src/builders/dev-server/vite-server.ts     | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/packages/angular/build/src/builders/dev-server/vite-server.ts b/packages/angular/build/src/builders/dev-server/vite-server.ts
index b0ad41bbdb1b..dfe8035acde0 100644
--- a/packages/angular/build/src/builders/dev-server/vite-server.ts
+++ b/packages/angular/build/src/builders/dev-server/vite-server.ts
@@ -347,8 +347,9 @@ export async function* serveWithVite(
       externalMetadata.implicitServer.length = 0;
       externalMetadata.implicitBrowser.length = 0;
 
-      externalMetadata.explicitBrowser.push(...explicit);
-      externalMetadata.explicitServer.push(...explicit, ...builtinModules);
+      const externalDeps = browserOptions.externalDependencies ?? [];
+      externalMetadata.explicitBrowser.push(...explicit, ...externalDeps);
+      externalMetadata.explicitServer.push(...explicit, ...externalDeps, ...builtinModules);
       externalMetadata.implicitServer.push(...implicitServerFiltered);
       externalMetadata.implicitBrowser.push(...implicitBrowserFiltered);