Add JSHint to CategoryTree

Bug: T65112
Change-Id: Ib10f4b043fab5b3163f6e343ae5ff926300b60c8

.jscsrc

@@ -0,0 +1,7 @@
+{
+	"preset": "wikimedia",
+
+	"disallowQuotedKeysInObjects": null,
+	"requireSpacesInsideParentheses": null,
+	"requireSpacesInsideArrayBrackets": null
+}

.jshintignore

@@ -1,2 +0,0 @@
-# Someone should make this pass...
-modules/ext.categoryTree.js

.jshintrc

@@ -0,0 +1,26 @@
+{
+	// Enforcing
+	"bitwise": true,
+	"eqeqeq": true,
+	"es3": true,
+	"freeze": true,
+	"latedef": true,
+	"noarg": true,
+	"nonew": true,
+	"undef": true,
+	"unused": true,
+	"strict": false,
+
+	// Relaxing
+	"laxbreak": true,
+	"multistr": true,
+
+	// Environment
+	"browser": true,
+
+	"globals": {
+		"mediaWiki": true,
+		"jQuery": false,
+		"QUnit": false
+	}
+}

modules/ext.categoryTree.js

@@ -25,7 +25,7 @@
 		 * @context {Element} CategoryTreeToggle
 		 * @param e {jQuery.Event}
 		 */
-		function handleNode( e ) {
+		function handleNode( /*e*/ ) {
 			var $link = $( this );
 			if ( $link.data( 'ct-state' ) === 'collapsed' ) {
 				expandNode( $link );