fixup! refactor(@angular/pwa): minor refactorings to make code cleaner

Author: gkalpak

packages/angular/pwa/pwa/index.ts

@@ -37,8 +37,17 @@ function addServiceWorker(options: PwaOptions): Rule {
 }
 
 function getIndent(text: string): string {
-  // This RegExp is guaranteed to match any string (even if it is a zero-length match).
-  return (/^ */.exec(text) as RegExpExecArray)[0];
+  let indent = '';
+
+  for (const char of text) {
+    if (char === ' ' || char === '\t') {
+      indent += char;
+    } else {
+      break;
+    }
+  }
+
+  return indent;
 }
 
 function updateIndexFile(options: PwaOptions): Rule {