Merge pull request microsoft#9853 from HerringtonDarkholme/master

DanielRosenwasser · web-flow · commit a2f45e95993d · 2016-07-20T22:22:35.000-07:00
Fix microsoft#9843. IScriptSnapshot can return undefined
diff --git a/src/services/services.ts b/src/services/services.ts
@@ -94,7 +94,7 @@ namespace ts {
          * change range cannot be determined.  However, in that case, incremental parsing will
          * not happen and the entire document will be re - parsed.
          */
-        getChangeRange(oldSnapshot: IScriptSnapshot): TextChangeRange;
+        getChangeRange(oldSnapshot: IScriptSnapshot): TextChangeRange | undefined;
 
         /** Releases all resources held by this script snapshot */
         dispose?(): void;
