Build: More ESLint related changes

.eslintrc

@@ -3,5 +3,9 @@
 	"root": true,
 	"env": {
 		"node": true
+	},
+	rules: {
+		// Until https://github.com/jquery/eslint-config-jquery/issues/7 is resolved
+		"no-unused-expressions": "error"
 	}
 }

dist/.eslintrc

@@ -5,6 +5,7 @@
 		"no-multiple-empty-lines": "off",
 
 		// Because sizze is not compatible to jquery code style
+		"no-unused-expressions": "off",
 		"lines-around-comment": "off",
 		"space-in-parens": "off",
 		"camelcase": "off",

package.json

@@ -36,7 +36,7 @@
     "grunt-compare-size": "0.4.2",
     "grunt-contrib-uglify": "1.0.1",
     "grunt-contrib-watch": "1.0.0",
-    "grunt-eslint": "18.1.0",
+    "grunt-eslint": "19.0.0",
     "grunt-git-authors": "3.2.0",
     "grunt-jsonlint": "1.0.7",
     "grunt-newer": "1.2.0",

src/attributes/prop.js

@@ -88,16 +88,24 @@ jQuery.extend( {
 // on the option
 // The getter ensures a default option is selected
 // when in an optgroup
+// eslint rule "no-unused-expressions" is disabled for this code
+// since it considers such accessions noop
 if ( !support.optSelected ) {
 	jQuery.propHooks.selected = {
 		get: function( elem ) {
+
+			/* eslint no-unused-expressions: "off" */
+
 			var parent = elem.parentNode;
 			if ( parent && parent.parentNode ) {
 				parent.parentNode.selectedIndex;
 			}
 			return null;
 		},
 		set: function( elem ) {
+
+			/* eslint no-unused-expressions: "off" */
+
 			var parent = elem.parentNode;
 			if ( parent ) {
 				parent.selectedIndex;

src/css/showHide.js

@@ -18,7 +18,7 @@ function getDefaultDisplay( elem ) {
 		return display;
 	}
 
-	temp = doc.body.appendChild( doc.createElement( nodeName ) ),
+	temp = doc.body.appendChild( doc.createElement( nodeName ) );
 	display = jQuery.css( temp, "display" );
 
 	temp.parentNode.removeChild( temp );

test/unit/core.js

@@ -1196,7 +1196,6 @@ QUnit.test( "jQuery.extend(Object, Object)", function( assert ) {
 	ret = jQuery.extend( true, { "foo": 4 }, { "foo": new MyNumber( 5 ) } );
 	assert.ok( parseInt( ret.foo, 10 ) === 5, "Wrapped numbers copy correctly" );
 
-	nullUndef;
 	nullUndef = jQuery.extend( {}, options, { "xnumber2": null } );
 	assert.ok( nullUndef[ "xnumber2" ] === null, "Check to make sure null values are copied" );
 

test/unit/manipulation.js

@@ -1359,7 +1359,7 @@ QUnit.test( "Empty replaceWith (trac-13401; trac-13596; gh-2204)", function( ass
 		assert.strictEqual( $el.html(), "", "replaceWith(" + label + ")" );
 		$el.html( "<b/>" ).children().replaceWith( function() { return input; } );
 		assert.strictEqual( $el.html(), "", "replaceWith(function returning " + label + ")" );
-		$el.html( "<i/>" ).children().replaceWith( function( i ) { i; return input; } );
+		$el.html( "<i/>" ).children().replaceWith( function( i ) { return input; } );
 		assert.strictEqual( $el.html(), "", "replaceWith(other function returning " + label + ")" );
 		$el.html( "<p/>" ).children().replaceWith( function( i ) {
 			return i ?