From be959c4885b7ea7b959c98bbc652d389e2332bf3 Mon Sep 17 00:00:00 2001
From: Alan Agius <alan.agius4@gmail.com>
Date: Tue, 8 Dec 2020 13:14:27 +0100
Subject: [PATCH] fix(@angular-devkit/build-angular): add file path in CSS
 optimization exception

Closes #19561
---
 .../src/webpack/plugins/optimize-css-webpack-plugin.ts          | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/angular_devkit/build_angular/src/webpack/plugins/optimize-css-webpack-plugin.ts b/packages/angular_devkit/build_angular/src/webpack/plugins/optimize-css-webpack-plugin.ts
index 649d2b97e034..276d503fb068 100644
--- a/packages/angular_devkit/build_angular/src/webpack/plugins/optimize-css-webpack-plugin.ts
+++ b/packages/angular_devkit/build_angular/src/webpack/plugins/optimize-css-webpack-plugin.ts
@@ -115,7 +115,7 @@ export class OptimizeCssWebpackPlugin {
             // tslint:disable-next-line: no-any
             (cssNano.process as any)(content, postCssOptions, cssNanoOptions)
               .then(resolve)
-              .catch(reject);
+              .catch((err: Error) => reject(new Error(`${file} ${err.message}`)));
           });
 
           for (const { text } of output.warnings()) {