From b4149bb1bcaea00fb6aabc5bced6c6ec5f809aca Mon Sep 17 00:00:00 2001
From: Alan Agius <17563226+alan-agius4@users.noreply.github.com>
Date: Fri, 17 Apr 2026 08:40:13 +0000
Subject: [PATCH] fix(@angular/build): use rootDir for HMR component updates
 path resolution

Use `compilerOptions.rootDir` when calculating the relative path for HMR component updates, falling back to the current directory if not set. This ensures correct path resolution when `rootDir` is configured in `tsconfig`.

Closes #33005 and closes #32998
---
 .../build/src/tools/angular/compilation/aot-compilation.ts   | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/packages/angular/build/src/tools/angular/compilation/aot-compilation.ts b/packages/angular/build/src/tools/angular/compilation/aot-compilation.ts
index 06a3f6e8c8d6..73462c2b3475 100644
--- a/packages/angular/build/src/tools/angular/compilation/aot-compilation.ts
+++ b/packages/angular/build/src/tools/angular/compilation/aot-compilation.ts
@@ -152,7 +152,10 @@ export class AotCompilation extends AngularCompilation {
           continue;
         }
         const componentFilename = node.getSourceFile().fileName;
-        let relativePath = relative(host.getCurrentDirectory(), componentFilename);
+        let relativePath = relative(
+          compilerOptions.rootDir ?? host.getCurrentDirectory(),
+          componentFilename,
+        );
         if (relativePath.startsWith('..')) {
           relativePath = componentFilename;
         }