From 5e88ad9effce302f0c2d9aed08481c927ffaaeff Mon Sep 17 00:00:00 2001
From: Hans Larsen <hans@hansl.ca>
Date: Mon, 20 Nov 2017 15:25:56 -0800
Subject: [PATCH] fix(@ngtools/webpack): add a simple sanity check for
 preventing wrong styleUrls

Fixes #8560.
---
 packages/@ngtools/webpack/src/resource_loader.ts | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/packages/@ngtools/webpack/src/resource_loader.ts b/packages/@ngtools/webpack/src/resource_loader.ts
index 38dc019c6fbc..e914c654e6c9 100644
--- a/packages/@ngtools/webpack/src/resource_loader.ts
+++ b/packages/@ngtools/webpack/src/resource_loader.ts
@@ -36,6 +36,11 @@ export class WebpackResourceLoader {
       throw new Error('WebpackResourceLoader cannot be used without parentCompilation');
     }
 
+    // Simple sanity check.
+    if (filePath.match(/\.[jt]s$/)) {
+      return Promise.reject('Cannot use a JavaScript or TypeScript file for styleUrl.');
+    }
+
     const compilerName = `compiler(${this._uniqueId++})`;
     const outputOptions = { filename: filePath };
     const relativePath = path.relative(this._context || '', filePath);