eslint: enforce use of const when variable not modified

src/editor/components/jgraduate/Util.js

@@ -21,7 +21,7 @@ export function isObject(item) {
 }
 
 export function mergeDeep(target, source) {
-  let output = Object.assign({}, target);
+  const output = Object.assign({}, target);
   if (isObject(target) && isObject(source)) {
     Object.keys(source).forEach((key) => {
       if (isObject(source[key])) {
@@ -146,7 +146,7 @@ export function getParents(elem, selector) {
 }
 
 export function getParentsUntil(elem, parent, selector) {
-  let parents = [];
+  const parents = [];
   let parentType;
   let selectorType;
   if ( parent ) {

src/editor/components/jgraduate/jQuery.jPicker.js

@@ -1652,7 +1652,7 @@ export function jPickerMethod (elem, options, commitCallback, liveCallback, canc
   let iconColor = null; // iconColor for popup icon
   let iconAlpha = null; // iconAlpha for popup icon
   let iconImage = null; // iconImage popup icon
-  let moveBar = null; // drag bar
+  const moveBar = null; // drag bar
   Object.assign(that, {
     // public properties, methods, and callbacks
     commitCallback, // commitCallback function can be overridden to return the selected color to a method you specify when the user clicks "OK"