ESLint one-var, no-var rules (#3239)

* fixed issues for eslint one-var and no-var rules

Co-authored-by: Joshi <simplyrender@gmail.com>
Co-authored-by: Andrew Henry <akhenry@gmail.com>

src/api/objects/object-utils.js

@@ -58,9 +58,9 @@ define([
             return keyString;
         }
 
-        var namespace = '',
-            key = keyString;
-        for (var i = 0; i < key.length; i++) {
+        let namespace = '';
+        let key = keyString;
+        for (let i = 0; i < key.length; i++) {
             if (key[i] === "\\" && key[i + 1] === ":") {
                 i++; // skip escape character.
             } else if (key[i] === ":") {