From a8dbf1da27faf772a4df382b1301e95c32d1ba89 Mon Sep 17 00:00:00 2001
From: Alan Agius <alanagius@google.com>
Date: Tue, 5 Dec 2023 15:09:39 +0000
Subject: [PATCH] fix(@angular-devkit/build-angular): watch symlink when using
 `preserveSymlinks` option

When using the esbuild based builder symlinks are not watched when `preserveSymlinks` is enabled.

Closes #26585

(cherry picked from commit ffa2d07c8e8b63aac218770918a657235d44b645)
---
 .../build_angular/src/builders/application/build-action.ts     | 3 +++
 .../build_angular/src/builders/application/index.ts            | 1 +
 .../angular_devkit/build_angular/src/tools/esbuild/watcher.ts  | 2 ++
 3 files changed, 6 insertions(+)

diff --git a/packages/angular_devkit/build_angular/src/builders/application/build-action.ts b/packages/angular_devkit/build_angular/src/builders/application/build-action.ts
index b7c4030bf7a7..fb0ed18a8dbf 100644
--- a/packages/angular_devkit/build_angular/src/builders/application/build-action.ts
+++ b/packages/angular_devkit/build_angular/src/builders/application/build-action.ts
@@ -33,6 +33,7 @@ export async function* runEsBuildBuildAction(
     deleteOutputPath?: boolean;
     poll?: number;
     signal?: AbortSignal;
+    preserveSymlinks?: boolean;
   },
 ): AsyncIterable<(ExecutionResult['outputWithFiles'] | ExecutionResult['output']) & BuilderOutput> {
   const {
@@ -48,6 +49,7 @@ export async function* runEsBuildBuildAction(
     projectRoot,
     workspaceRoot,
     progress,
+    preserveSymlinks,
   } = options;
 
   if (deleteOutputPath && writeToFileSystem) {
@@ -79,6 +81,7 @@ export async function* runEsBuildBuildAction(
     watcher = createWatcher({
       polling: typeof poll === 'number',
       interval: poll,
+      followSymlinks: preserveSymlinks,
       ignored: [
         // Ignore the output and cache paths to avoid infinite rebuild cycles
         outputPath,
diff --git a/packages/angular_devkit/build_angular/src/builders/application/index.ts b/packages/angular_devkit/build_angular/src/builders/application/index.ts
index a2868d2df27e..c89745f97558 100644
--- a/packages/angular_devkit/build_angular/src/builders/application/index.ts
+++ b/packages/angular_devkit/build_angular/src/builders/application/index.ts
@@ -64,6 +64,7 @@ export async function* buildApplicationInternal(
     },
     {
       watch: normalizedOptions.watch,
+      preserveSymlinks: normalizedOptions.preserveSymlinks,
       poll: normalizedOptions.poll,
       deleteOutputPath: normalizedOptions.deleteOutputPath,
       cacheOptions: normalizedOptions.cacheOptions,
diff --git a/packages/angular_devkit/build_angular/src/tools/esbuild/watcher.ts b/packages/angular_devkit/build_angular/src/tools/esbuild/watcher.ts
index 347afc4f034f..da6b2c8de02e 100644
--- a/packages/angular_devkit/build_angular/src/tools/esbuild/watcher.ts
+++ b/packages/angular_devkit/build_angular/src/tools/esbuild/watcher.ts
@@ -39,11 +39,13 @@ export function createWatcher(options?: {
   polling?: boolean;
   interval?: number;
   ignored?: string[];
+  followSymlinks?: boolean;
 }): BuildWatcher {
   const watcher = new FSWatcher({
     usePolling: options?.polling,
     interval: options?.interval,
     ignored: options?.ignored,
+    followSymlinks: options?.followSymlinks,
     disableGlobbing: true,
     ignoreInitial: true,
   });