JavaScriptExpert
diff --git a/‎apps/api-extractor/src/generators/dtsRollup/DtsRollupGenerator.ts‎
Lines changed: 8 additions & 12 deletions b/‎apps/api-extractor/src/generators/dtsRollup/DtsRollupGenerator.ts‎
Lines changed: 8 additions & 12 deletions
@@ -5,7 +5,7 @@
 
 import * as ts from 'typescript';
 import * as tsdoc from '@microsoft/tsdoc';
-import { FileSystem, NewlineKind } from '@microsoft/node-core-library';
+import { FileSystem, NewlineKind, Sort } from '@microsoft/node-core-library';
 
 import { ExtractorContext } from '../../ExtractorContext';
 import { IndentedWriter } from '../../utils/IndentedWriter';
@@ -62,14 +62,14 @@ export class DtsRollupGenerator {
    *
    * /// <reference types="example-library" />
    */
-  private _dtsTypeReferenceDirectives: string[] = [];
+  private _dtsTypeReferenceDirectives: Set<string> = new Set<string>();
 
   /**
    * A list of names (e.g. "runtime-library") that should appear in a reference like this:
    *
    * /// <reference lib="runtime-library" />
    */
-  private _dtsLibReferenceDirectives: string[] = [];
+  private _dtsLibReferenceDirectives: Set<string> = new Set<string>();
 
   public constructor(context: ExtractorContext) {
     this._context = context;
@@ -111,9 +111,9 @@ export class DtsRollupGenerator {
 
     this._makeUniqueNames();
 
-    this._dtsEntries.sort((a, b) => a.getSortKey().localeCompare(b.getSortKey()));
-    this._dtsTypeReferenceDirectives.sort();
-    this._dtsLibReferenceDirectives.sort();
+    Sort.sortBy(this._dtsEntries, x => x.getSortKey());
+    Sort.sortSet(this._dtsTypeReferenceDirectives);
+    Sort.sortSet(this._dtsLibReferenceDirectives);
   }
 
   /**
@@ -565,16 +565,12 @@ export class DtsRollupGenerator {
 
           for (const typeReferenceDirective of sourceFile.typeReferenceDirectives) {
             const name: string = sourceFile.text.substring(typeReferenceDirective.pos, typeReferenceDirective.end);
-            if (this._dtsTypeReferenceDirectives.indexOf(name) < 0) {
-              this._dtsTypeReferenceDirectives.push(name);
-            }
+            this._dtsTypeReferenceDirectives.add(name);
           }
 
           for (const libReferenceDirective of sourceFile.libReferenceDirectives) {
             const name: string = sourceFile.text.substring(libReferenceDirective.pos, libReferenceDirective.end);
-            if (this._dtsLibReferenceDirectives.indexOf(name) < 0) {
-              this._dtsLibReferenceDirectives.push(name);
-            }
+            this._dtsLibReferenceDirectives.add(name);
           }
 
         }