From c0933f2c0354a13ba3f752f29b24054177697faa Mon Sep 17 00:00:00 2001
From: Alan Agius <alanagius@google.com>
Date: Mon, 29 Jul 2024 06:55:05 +0000
Subject: [PATCH] fix(@angular/build): resolve error with `extract-i18n`
 builder for libraries

The `extract-i18n` builder is only intended to be used with application projects.

Closes #28109

(cherry picked from commit 0466fb74a2559e2b3cbcf0828de5b5e10b729ddb)
---
 .../build/src/builders/extract-i18n/builder.ts       | 12 ++++++++++++
 .../src/builders/extract-i18n/builder.ts             | 12 ++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/packages/angular/build/src/builders/extract-i18n/builder.ts b/packages/angular/build/src/builders/extract-i18n/builder.ts
index b74164758345..9f1e80c57cd9 100644
--- a/packages/angular/build/src/builders/extract-i18n/builder.ts
+++ b/packages/angular/build/src/builders/extract-i18n/builder.ts
@@ -32,6 +32,18 @@ export async function execute(
     return { success: false };
   }
 
+  const { projectType } = (await context.getProjectMetadata(projectName)) as {
+    projectType?: string;
+  };
+  if (projectType !== 'application') {
+    context.logger.error(
+      `Tried to extract from ${projectName} with 'projectType' ${projectType}, which is not supported.` +
+        ` The 'extract-i18n' builder can only extract from applications.`,
+    );
+
+    return { success: false };
+  }
+
   // Check Angular version.
   assertCompatibleAngularVersion(context.workspaceRoot);
 
diff --git a/packages/angular_devkit/build_angular/src/builders/extract-i18n/builder.ts b/packages/angular_devkit/build_angular/src/builders/extract-i18n/builder.ts
index 0a32b45599d4..f6a56920ccfc 100644
--- a/packages/angular_devkit/build_angular/src/builders/extract-i18n/builder.ts
+++ b/packages/angular_devkit/build_angular/src/builders/extract-i18n/builder.ts
@@ -35,6 +35,18 @@ export async function execute(
     return { success: false };
   }
 
+  const { projectType } = (await context.getProjectMetadata(projectName)) as {
+    projectType?: string;
+  };
+  if (projectType !== 'application') {
+    context.logger.error(
+      `Tried to extract from ${projectName} with 'projectType' ${projectType}, which is not supported.` +
+        ` The 'extract-i18n' builder can only extract from applications.`,
+    );
+
+    return { success: false };
+  }
+
   // Check Angular version.
   assertCompatibleAngularVersion(context.workspaceRoot);