Add property for unchecked completions

src/server/protocol.ts

@@ -2086,6 +2086,11 @@ namespace ts.server.protocol {
          * Then either that enum/class or a namespace containing it will be the recommended symbol.
          */
         isRecommended?: true;
+        /**
+         * If true, this completion was generated from traversing the name table of an unchecked JS file,
+         * and therefore may not be accurate.
+         */
+        isUncheckedCompletion?: true;
     }
 
     /**