- Adding missing diagnostic message

- removing extra semi-colon

src/compiler/diagnosticMessages.json

@@ -2450,11 +2450,14 @@
         "category": "Message",
         "code": 6084
     },
+    "Option '{0}' should have array of strings as a value.": {
+        "category": "Error",
+        "code": 6103
+    },
     "Do not emit 'use strict' directives in module output.": {
         "category": "Message",
         "code": 6112
     },
-
     "Variable '{0}' implicitly has an '{1}' type.": {
         "category": "Error",
         "code": 7005

src/services/jsTyping.ts

@@ -63,7 +63,7 @@ namespace ts.JsTyping {
             }
             else {
                 safeList = {};
-            };
+            }
         }
 
         const filesToWatch: string[] = [];