From 334cc202d2ac00f7118dba1b4854dd21d6b3150c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kai=20R=C3=B6der?= <roeder.kai@gmail.com>
Date: Wed, 2 Oct 2019 17:05:21 +0200
Subject: [PATCH] fix bug that causes an error when style files are empty

---
 app/angular/src/server/ngx-template-loader/index.ts | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/app/angular/src/server/ngx-template-loader/index.ts b/app/angular/src/server/ngx-template-loader/index.ts
index 4ab1c7226860..6e2d2381ee14 100644
--- a/app/angular/src/server/ngx-template-loader/index.ts
+++ b/app/angular/src/server/ngx-template-loader/index.ts
@@ -18,7 +18,11 @@ const replaceStringsWithRequires = (string: string) => {
     if (url.charAt(0) !== '.') {
       newUrl = `./${url}`;
     }
-    return `(require('${newUrl}').default || require('${newUrl}'))`;
+    const requireString = `(require('${newUrl}').default || require('${newUrl}'))`;
+
+    // without the length check an empty style file will throw
+    // "Expected 'styles' to be an array of strings"
+    return `${requireString}.length ? ${requireString} : ''`;
   });
 };
 
@@ -35,12 +39,10 @@ export default function(source: string) {
       return `${templateProperty}:${replaceStringsWithRequires(templateUrlString)}`;
     })
     .replace(stylesRegex, (_, styleUrlsString: string) => {
-      console.log(styleUrlsString);
       // replace: stylesUrl: ['./foo.css', "./baz.css", "./index.component.css"]
       // with: styles: [require('./foo.css'), require("./baz.css"), require("./index.component.css")]
       // or: styleUrls: [require('./foo.css'), require("./baz.css"), require("./index.component.css")]
       // if `keepUrl` query parameter is set to true.
-      console.log(`${styleProperty}:${replaceStringsWithRequires(styleUrlsString)}`);
       return `${styleProperty}:${replaceStringsWithRequires(styleUrlsString)}`;
     });
 }