Fix new lint error

rbuckton · rbuckton · commit ed914a8d4755 · 2017-11-03T23:53:13.000-07:00
diff --git a/src/compiler/core.ts b/src/compiler/core.ts
@@ -1627,7 +1627,7 @@ namespace ts {
     /**
      * Creates a string comparer for use with string collation in the UI.
      */
-    const createUIStringComparer = (function () {
+    const createUIStringComparer = (() => {
         let defaultComparer: Comparer<string> | undefined;
         let enUSComparer: Comparer<string> | undefined;
 
