diff --git a/build/tasks/build.js b/build/tasks/build.js
index b59ef816e..73dfd581d 100644
--- a/build/tasks/build.js
+++ b/build/tasks/build.js
@@ -372,7 +372,7 @@ module.exports = function( grunt ) {
 
 		// Ask for permission the first time
 		if ( insight.optOut === undefined ) {
-			insight.askPermission( null, function( error, result ) {
+			insight.askPermission( null, function( _error, result ) {
 				exec( result );
 			} );
 		} else {
diff --git a/dist/.eslintrc.json b/dist/.eslintrc.json
index c2aa05c5e..45ba0c520 100644
--- a/dist/.eslintrc.json
+++ b/dist/.eslintrc.json
@@ -7,9 +7,10 @@
 		// That is okay for the built version
 		"no-multiple-empty-lines": "off",
 
-		// Because sizzle is not compatible to jquery code style
+		// Sizzle is not compatible with jQuery code style
 		"no-nested-ternary": "off",
 		"no-unused-expressions": "off",
+		"no-unused-vars": "off",
 		"lines-around-comment": "off",
 		"space-in-parens": "off",
 		"camelcase": "off",
diff --git a/package.json b/package.json
index 49a0d792f..bef8aa55a 100644
--- a/package.json
+++ b/package.json
@@ -29,7 +29,7 @@
     "@babel/plugin-transform-for-of": "7.4.3",
     "commitplease": "3.2.0",
     "core-js-bundle": "3.0.0",
-    "eslint-config-jquery": "1.0.1",
+    "eslint-config-jquery": "2.0.0",
     "grunt": "1.0.4",
     "grunt-babel": "8.0.0",
     "grunt-cli": "1.3.2",
diff --git a/src/ajax.js b/src/ajax.js
index 31880032d..c1f7b14d9 100644
--- a/src/ajax.js
+++ b/src/ajax.js
@@ -838,7 +838,7 @@ jQuery.extend( {
 	}
 } );
 
-jQuery.each( [ "get", "post" ], function( i, method ) {
+jQuery.each( [ "get", "post" ], function( _i, method ) {
 	jQuery[ method ] = function( url, data, callback, type ) {
 
 		// Shift arguments if data argument was omitted
diff --git a/src/attributes/attr.js b/src/attributes/attr.js
index cd2b3128b..49d5e2550 100644
--- a/src/attributes/attr.js
+++ b/src/attributes/attr.js
@@ -119,7 +119,7 @@ boolHook = {
 	}
 };
 
-jQuery.each( jQuery.expr.match.bool.source.match( /\w+/g ), function( i, name ) {
+jQuery.each( jQuery.expr.match.bool.source.match( /\w+/g ), function( _i, name ) {
 	var getter = attrHandle[ name ] || jQuery.find.attr;
 
 	attrHandle[ name ] = function( elem, name, isXML ) {
diff --git a/src/core.js b/src/core.js
index 5a5c7469e..f1ef9ef97 100644
--- a/src/core.js
+++ b/src/core.js
@@ -4,7 +4,6 @@
 
 define( [
 	"./var/arr",
-	"./var/document",
 	"./var/getProto",
 	"./var/slice",
 	"./var/concat",
@@ -20,7 +19,7 @@ define( [
 	"./var/isWindow",
 	"./core/DOMEval",
 	"./core/toType"
-], function( arr, document, getProto, slice, concat, push, indexOf,
+], function( arr, getProto, slice, concat, push, indexOf,
 	class2type, toString, hasOwn, fnToString, ObjectFunctionString,
 	trim, support, isWindow, DOMEval, toType ) {
 
@@ -365,7 +364,7 @@ if ( typeof Symbol === "function" ) {
 
 // Populate the class2type map
 jQuery.each( "Boolean Number String Function Array Date RegExp Object Error Symbol".split( " " ),
-function( i, name ) {
+function( _i, name ) {
 	class2type[ "[object " + name + "]" ] = name.toLowerCase();
 } );
 
diff --git a/src/core/access.js b/src/core/access.js
index f600600d5..e088a6557 100644
--- a/src/core/access.js
+++ b/src/core/access.js
@@ -37,7 +37,7 @@ var access = function( elems, fn, key, value, chainable, emptyGet, raw ) {
 			// ...except when executing function values
 			} else {
 				bulk = fn;
-				fn = function( elem, key, value ) {
+				fn = function( elem, _key, value ) {
 					return bulk.call( jQuery( elem ), value );
 				};
 			}
diff --git a/src/core/camelCase.js b/src/core/camelCase.js
index 95de46866..61ed90d05 100644
--- a/src/core/camelCase.js
+++ b/src/core/camelCase.js
@@ -6,7 +6,7 @@ define( [], function() {
 var rdashAlpha = /-([a-z])/g;
 
 // Used by camelCase as callback to replace()
-function fcamelCase( all, letter ) {
+function fcamelCase( _all, letter ) {
 	return letter.toUpperCase();
 }
 
diff --git a/src/css.js b/src/css.js
index 2ae0c0c2c..b3b05e40f 100644
--- a/src/css.js
+++ b/src/css.js
@@ -34,7 +34,7 @@ var
 		fontWeight: "400"
 	};
 
-function setPositiveNumber( elem, value, subtract ) {
+function setPositiveNumber( _elem, value, subtract ) {
 
 	// Any relative (+/-) values have already been
 	// normalized at this point
@@ -311,7 +311,7 @@ jQuery.extend( {
 	}
 } );
 
-jQuery.each( [ "height", "width" ], function( i, dimension ) {
+jQuery.each( [ "height", "width" ], function( _i, dimension ) {
 	jQuery.cssHooks[ dimension ] = {
 		get: function( elem, computed, extra ) {
 			if ( computed ) {
diff --git a/src/css/var/swap.js b/src/css/var/swap.js
index 1a9556bad..69388e5f7 100644
--- a/src/css/var/swap.js
+++ b/src/css/var/swap.js
@@ -3,7 +3,7 @@ define( function() {
 "use strict";
 
 // A method for quickly swapping in/out CSS properties to get correct calculations.
-return function( elem, options, callback, args ) {
+return function( elem, options, callback ) {
 	var ret, name,
 		old = {};
 
@@ -13,7 +13,7 @@ return function( elem, options, callback, args ) {
 		elem.style[ name ] = options[ name ];
 	}
 
-	ret = callback.apply( elem, args || [] );
+	ret = callback.call( elem );
 
 	// Revert the old values
 	for ( name in options ) {
diff --git a/src/deferred.js b/src/deferred.js
index 81a1d0140..771e8381b 100644
--- a/src/deferred.js
+++ b/src/deferred.js
@@ -75,7 +75,7 @@ jQuery.extend( {
 					var fns = arguments;
 
 					return jQuery.Deferred( function( newDefer ) {
-						jQuery.each( tuples, function( i, tuple ) {
+						jQuery.each( tuples, function( _i, tuple ) {
 
 							// Map tuples (progress, done, fail) to arguments (done, fail, progress)
 							var fn = typeof fns[ tuple[ 4 ] ] === "function" &&
diff --git a/src/deprecated.js b/src/deprecated.js
index 10d708ce2..4edefaca0 100644
--- a/src/deprecated.js
+++ b/src/deprecated.js
@@ -1,13 +1,9 @@
 define( [
 	"./core",
-	"./core/nodeName",
-	"./core/toType",
-	"./css/cssCamelCase",
-	"./var/isWindow",
 	"./var/slice",
 
 	"./event/alias"
-], function( jQuery, nodeName, toType, cssCamelCase, isWindow, slice ) {
+], function( jQuery, slice ) {
 
 "use strict";
 
diff --git a/src/effects.js b/src/effects.js
index a65283e28..46ad988ad 100644
--- a/src/effects.js
+++ b/src/effects.js
@@ -5,7 +5,6 @@ define( [
 	"./var/rnothtmlwhite",
 	"./css/var/cssExpand",
 	"./css/var/isHiddenWithinTree",
-	"./css/var/swap",
 	"./css/adjustCSS",
 	"./css/cssCamelCase",
 	"./data/var/dataPriv",
@@ -19,7 +18,7 @@ define( [
 	"./css",
 	"./effects/Tween"
 ], function( jQuery, document, rcssNum, rnothtmlwhite, cssExpand,
-	isHiddenWithinTree, swap, adjustCSS, cssCamelCase, dataPriv, showHide ) {
+	isHiddenWithinTree, adjustCSS, cssCamelCase, dataPriv, showHide ) {
 
 "use strict";
 
@@ -621,7 +620,7 @@ jQuery.fn.extend( {
 	}
 } );
 
-jQuery.each( [ "toggle", "show", "hide" ], function( i, name ) {
+jQuery.each( [ "toggle", "show", "hide" ], function( _i, name ) {
 	var cssFn = jQuery.fn[ name ];
 	jQuery.fn[ name ] = function( speed, easing, callback ) {
 		return speed == null || typeof speed === "boolean" ?
diff --git a/src/event/ajax.js b/src/event/ajax.js
index 500b36cdd..dd9c0ffe2 100644
--- a/src/event/ajax.js
+++ b/src/event/ajax.js
@@ -13,7 +13,7 @@ jQuery.each( [
 	"ajaxError",
 	"ajaxSuccess",
 	"ajaxSend"
-], function( i, type ) {
+], function( _i, type ) {
 	jQuery.fn[ type ] = function( fn ) {
 		return this.on( type, fn );
 	};
diff --git a/src/event/alias.js b/src/event/alias.js
index 863c94ad2..46bd1ae80 100644
--- a/src/event/alias.js
+++ b/src/event/alias.js
@@ -10,7 +10,7 @@ define( [
 jQuery.each( ( "blur focus focusin focusout resize scroll click dblclick " +
 	"mousedown mouseup mousemove mouseover mouseout mouseenter mouseleave " +
 	"change select submit keydown keypress keyup contextmenu" ).split( " " ),
-	function( i, name ) {
+	function( _i, name ) {
 
 	// Handle event binding
 	jQuery.fn[ name ] = function( data, fn ) {
diff --git a/src/manipulation.js b/src/manipulation.js
index cca3947ce..4d20ec8d6 100644
--- a/src/manipulation.js
+++ b/src/manipulation.js
@@ -4,7 +4,6 @@ define( [
 	"./var/concat",
 	"./var/isIE",
 	"./var/push",
-	"./var/rcheckableType",
 	"./core/access",
 	"./manipulation/var/rtagName",
 	"./manipulation/var/rscriptType",
@@ -23,9 +22,8 @@ define( [
 	"./traversing",
 	"./selector",
 	"./event"
-], function( jQuery, isAttached, concat, isIE, push,
-	rcheckableType, access, rtagName, rscriptType,
-	wrapMap, getAll, setGlobalEval, buildFragment,
+], function( jQuery, isAttached, concat, isIE, push, access, rtagName,
+	rscriptType, wrapMap, getAll, setGlobalEval, buildFragment,
 	dataPriv, dataUser, acceptData, DOMEval, nodeName ) {
 
 "use strict";
diff --git a/src/offset.js b/src/offset.js
index 531b75ff2..91c96d877 100644
--- a/src/offset.js
+++ b/src/offset.js
@@ -1,15 +1,12 @@
 define( [
 	"./core",
 	"./core/access",
-	"./var/document",
 	"./var/documentElement",
-	"./css/var/rnumnonpx",
-	"./css/curCSS",
 	"./var/isWindow",
 	"./core/init",
 	"./css",
 	"./selector" // contains
-], function( jQuery, access, document, documentElement, rnumnonpx, curCSS, isWindow ) {
+], function( jQuery, access, documentElement, isWindow ) {
 
 "use strict";
 
diff --git a/src/serialize.js b/src/serialize.js
index 0cf5ddb44..6743b78e9 100644
--- a/src/serialize.js
+++ b/src/serialize.js
@@ -113,7 +113,7 @@ jQuery.fn.extend( {
 				rsubmittable.test( this.nodeName ) && !rsubmitterTypes.test( type ) &&
 				( this.checked || !rcheckableType.test( type ) );
 		} )
-		.map( function( i, elem ) {
+		.map( function( _i, elem ) {
 			var val = jQuery( this ).val();
 
 			if ( val == null ) {
diff --git a/src/traversing.js b/src/traversing.js
index 72530ed85..59fa977c2 100644
--- a/src/traversing.js
+++ b/src/traversing.js
@@ -118,7 +118,7 @@ jQuery.each( {
 	parents: function( elem ) {
 		return dir( elem, "parentNode" );
 	},
-	parentsUntil: function( elem, i, until ) {
+	parentsUntil: function( elem, _i, until ) {
 		return dir( elem, "parentNode", until );
 	},
 	next: function( elem ) {
@@ -133,10 +133,10 @@ jQuery.each( {
 	prevAll: function( elem ) {
 		return dir( elem, "previousSibling" );
 	},
-	nextUntil: function( elem, i, until ) {
+	nextUntil: function( elem, _i, until ) {
 		return dir( elem, "nextSibling", until );
 	},
-	prevUntil: function( elem, i, until ) {
+	prevUntil: function( elem, _i, until ) {
 		return dir( elem, "previousSibling", until );
 	},
 	siblings: function( elem ) {