Build: Migrate from JSHint & JSCS to ESLint

Fixes #15393
Closes gh-1958

20 files changed, 199 insertions, 90 deletions

diff --git a/ui/widgets/accordion.js b/ui/widgets/accordion.js
index 59a6a7315..112781925 100644
--- a/ui/widgets/accordion.js
+++ b/ui/widgets/accordion.js
@@ -9,9 +9,9 @@
 
 //>>label: Accordion
 //>>group: Widgets
-// jscs:disable maximumLineLength
+/* eslint-disable max-len */
 //>>description: Displays collapsible content panels for presenting information in a limited amount of space.
-// jscs:enable maximumLineLength
+/* eslint-enable max-len */
 //>>docs: http://api.jqueryui.com/accordion/
 //>>demos: http://jqueryui.com/accordion/
 //>>css.structure: ../../themes/base/core.css
@@ -19,6 +19,8 @@
 //>>css.theme: ../../themes/base/theme.css
 
 ( function( factory ) {
+	"use strict";
+
 	if ( typeof define === "function" && define.amd ) {
 
 		// AMD. Register as an anonymous module.
@@ -34,7 +36,8 @@
 		// Browser globals
 		factory( jQuery );
 	}
-}( function( $ ) {
+} )( function( $ ) {
+"use strict";
 
 return $.widget( "ui.accordion", {
 	version: "@VERSION",
@@ -616,4 +619,4 @@ return $.widget( "ui.accordion", {
 	}
 } );
 
-} ) );
+} );
diff --git a/ui/widgets/autocomplete.js b/ui/widgets/autocomplete.js
index 66756820b..4166029b2 100644
--- a/ui/widgets/autocomplete.js
+++ b/ui/widgets/autocomplete.js
@@ -17,6 +17,8 @@
 //>>css.theme: ../../themes/base/theme.css
 
 ( function( factory ) {
+	"use strict";
+
 	if ( typeof define === "function" && define.amd ) {
 
 		// AMD. Register as an anonymous module.
@@ -34,7 +36,8 @@
 		// Browser globals
 		factory( jQuery );
 	}
-}( function( $ ) {
+} )( function( $ ) {
+"use strict";
 
 $.widget( "ui.autocomplete", {
 	version: "@VERSION",
@@ -616,7 +619,7 @@ $.widget( "ui.autocomplete", {
 		var editable = element.prop( "contentEditable" );
 
 		if ( editable === "inherit" ) {
-		  return this._isContentEditable( element.parent() );
+			return this._isContentEditable( element.parent() );
 		}
 
 		return editable === "true";
@@ -667,4 +670,4 @@ $.widget( "ui.autocomplete", $.ui.autocomplete, {
 
 return $.ui.autocomplete;
 
-} ) );
+} );
diff --git a/ui/widgets/button.js b/ui/widgets/button.js
index a4be3c76e..c7cbb4f04 100644
--- a/ui/widgets/button.js
+++ b/ui/widgets/button.js
@@ -17,6 +17,8 @@
 //>>css.theme: ../../themes/base/theme.css
 
 ( function( factory ) {
+	"use strict";
+
 	if ( typeof define === "function" && define.amd ) {
 
 		// AMD. Register as an anonymous module.
@@ -36,7 +38,8 @@
 		// Browser globals
 		factory( jQuery );
 	}
-}( function( $ ) {
+} )( function( $ ) {
+"use strict";
 
 $.widget( "ui.button", {
 	version: "@VERSION",
@@ -443,4 +446,4 @@ if ( $.uiBackCompat !== false ) {
 
 return $.ui.button;
 
-} ) );
+} );
diff --git a/ui/widgets/checkboxradio.js b/ui/widgets/checkboxradio.js
index 0cb1a0cf8..b2537d292 100644
--- a/ui/widgets/checkboxradio.js
+++ b/ui/widgets/checkboxradio.js
@@ -18,6 +18,8 @@
 //>>css.theme: ../../themes/base/theme.css
 
 ( function( factory ) {
+	"use strict";
+
 	if ( typeof define === "function" && define.amd ) {
 
 		// AMD. Register as an anonymous module.
@@ -32,7 +34,8 @@
 		// Browser globals
 		factory( jQuery );
 	}
-}( function( $ ) {
+} )( function( $ ) {
+"use strict";
 
 $.widget( "ui.checkboxradio", [ $.ui.formResetMixin, {
 	version: "@VERSION",
@@ -279,4 +282,4 @@ $.widget( "ui.checkboxradio", [ $.ui.formResetMixin, {
 
 return $.ui.checkboxradio;
 
-} ) );
+} );
diff --git a/ui/widgets/controlgroup.js b/ui/widgets/controlgroup.js
index 019abbec9..77a9e2265 100644
--- a/ui/widgets/controlgroup.js
+++ b/ui/widgets/controlgroup.js
@@ -17,6 +17,8 @@
 //>>css.theme: ../../themes/base/theme.css
 
 ( function( factory ) {
+	"use strict";
+
 	if ( typeof define === "function" && define.amd ) {
 
 		// AMD. Register as an anonymous module.
@@ -29,7 +31,9 @@
 		// Browser globals
 		factory( jQuery );
 	}
-}( function( $ ) {
+} )( function( $ ) {
+"use strict";
+
 var controlgroupCornerRegex = /ui-corner-([a-z]){2,6}/g;
 
 return $.widget( "ui.controlgroup", {
@@ -295,4 +299,4 @@ return $.widget( "ui.controlgroup", {
 		}
 	}
 } );
-} ) );
+} );
diff --git a/ui/widgets/datepicker.js b/ui/widgets/datepicker.js
index d363c8fc6..7dbcf3de7 100644
--- a/ui/widgets/datepicker.js
+++ b/ui/widgets/datepicker.js
@@ -1,5 +1,4 @@
-// jscs:disable maximumLineLength
-/* jscs:disable requireCamelCaseOrUpperCaseIdentifiers */
+/* eslint-disable max-len, camelcase */
 /*!
  * jQuery UI Datepicker @VERSION
  * http://jqueryui.com
@@ -19,6 +18,8 @@
 //>>css.theme: ../../themes/base/theme.css
 
 ( function( factory ) {
+	"use strict";
+
 	if ( typeof define === "function" && define.amd ) {
 
 		// AMD. Register as an anonymous module.
@@ -32,7 +33,8 @@
 		// Browser globals
 		factory( jQuery );
 	}
-}( function( $ ) {
+} )( function( $ ) {
+"use strict";
 
 $.extend( $.ui, { datepicker: { version: "@VERSION" } } );
 
@@ -62,6 +64,7 @@ function datepicker_getZindex( elem ) {
 
 	return 0;
 }
+
 /* Date picker manager.
    Use the singleton instance of this class, $.datepicker, to interact with the date picker.
    Settings for (groups of) date pickers are maintained in an instance object,
@@ -88,12 +91,12 @@ function Datepicker() {
 		prevText: "Prev", // Display text for previous month link
 		nextText: "Next", // Display text for next month link
 		currentText: "Today", // Display text for current month link
-		monthNames: [ "January","February","March","April","May","June",
-			"July","August","September","October","November","December" ], // Names of months for drop-down and formatting
+		monthNames: [ "January", "February", "March", "April", "May", "June",
+			"July", "August", "September", "October", "November", "December" ], // Names of months for drop-down and formatting
 		monthNamesShort: [ "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" ], // For formatting
 		dayNames: [ "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday" ], // For formatting
 		dayNamesShort: [ "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" ], // For formatting
-		dayNamesMin: [ "Su","Mo","Tu","We","Th","Fr","Sa" ], // Column headings for days starting at Sunday
+		dayNamesMin: [ "Su", "Mo", "Tu", "We", "Th", "Fr", "Sa" ], // Column headings for days starting at Sunday
 		weekHeader: "Wk", // Column header for week of the year
 		dateFormat: "mm/dd/yy", // See format options on parseDate
 		firstDay: 0, // The first day of the week, Sun = 0, Mon = 1, ...
@@ -161,6 +164,7 @@ function Datepicker() {
 }
 
 $.extend( Datepicker.prototype, {
+
 	/* Class name added to elements to indicate already configured with a date picker. */
 	markerClassName: "hasDatepicker",
 
@@ -453,7 +457,9 @@ $.extend( Datepicker.prototype, {
 		if ( nodeName === "input" ) {
 			target.disabled = false;
 			inst.trigger.filter( "button" ).
-				each( function() { this.disabled = false; } ).end().
+				each( function() {
+					this.disabled = false;
+				} ).end().
 				filter( "img" ).css( { opacity: "1.0", cursor: "" } );
 		} else if ( nodeName === "div" || nodeName === "span" ) {
 			inline = $target.children( "." + this._inlineClass );
@@ -462,7 +468,11 @@ $.extend( Datepicker.prototype, {
 				prop( "disabled", false );
 		}
 		this._disabledInputs = $.map( this._disabledInputs,
-			function( value ) { return ( value === target ? null : value ); } ); // delete entry
+
+			// Delete entry
+			function( value ) {
+				return ( value === target ? null : value );
+			} );
 	},
 
 	/* Disable the date picker to a jQuery selection.
@@ -481,7 +491,9 @@ $.extend( Datepicker.prototype, {
 		if ( nodeName === "input" ) {
 			target.disabled = true;
 			inst.trigger.filter( "button" ).
-				each( function() { this.disabled = true; } ).end().
+				each( function() {
+					this.disabled = true;
+				} ).end().
 				filter( "img" ).css( { opacity: "0.5", cursor: "default" } );
 		} else if ( nodeName === "div" || nodeName === "span" ) {
 			inline = $target.children( "." + this._inlineClass );
@@ -490,7 +502,11 @@ $.extend( Datepicker.prototype, {
 				prop( "disabled", true );
 		}
 		this._disabledInputs = $.map( this._disabledInputs,
-			function( value ) { return ( value === target ? null : value ); } ); // delete entry
+
+			// Delete entry
+			function( value ) {
+				return ( value === target ? null : value );
+			} );
 		this._disabledInputs[ this._disabledInputs.length ] = target;
 	},
 
@@ -518,8 +534,7 @@ $.extend( Datepicker.prototype, {
 	_getInst: function( target ) {
 		try {
 			return $.data( target, "datepicker" );
-		}
-		catch ( err ) {
+		} catch ( err ) {
 			throw "Missing instance data for this datepicker";
 		}
 	},
@@ -752,8 +767,7 @@ $.extend( Datepicker.prototype, {
 					$.datepicker._updateAlternate( inst );
 					$.datepicker._updateDatepicker( inst );
 				}
-			}
-			catch ( err ) {
+			} catch ( err ) {
 			}
 		}
 		return true;
@@ -1558,8 +1572,7 @@ $.extend( Datepicker.prototype, {
 				try {
 					return $.datepicker.parseDate( $.datepicker._get( inst, "dateFormat" ),
 						offset, $.datepicker._getFormatConfig( inst ) );
-				}
-				catch ( e ) {
+				} catch ( e ) {
 
 					// Ignore
 				}
@@ -2207,10 +2220,12 @@ $.fn.datepicker = function( options ) {
 			apply( $.datepicker, [ this[ 0 ] ].concat( otherArgs ) );
 	}
 	return this.each( function() {
-		typeof options === "string" ?
-			$.datepicker[ "_" + options + "Datepicker" ].
-				apply( $.datepicker, [ this ].concat( otherArgs ) ) :
+		if ( typeof options === "string" ) {
+			$.datepicker[ "_" + options + "Datepicker" ]
+				.apply( $.datepicker, [ this ].concat( otherArgs ) );
+		} else {
 			$.datepicker._attachDatepicker( this, options );
+		}
 	} );
 };
 
@@ -2221,4 +2236,4 @@ $.datepicker.version = "@VERSION";
 
 return $.datepicker;
 
-} ) );
+} );
diff --git a/ui/widgets/dialog.js b/ui/widgets/dialog.js
index dcb4f7056..6fa585c40 100644
--- a/ui/widgets/dialog.js
+++ b/ui/widgets/dialog.js
@@ -17,6 +17,8 @@
 //>>css.theme: ../../themes/base/theme.css
 
 ( function( factory ) {
+	"use strict";
+
 	if ( typeof define === "function" && define.amd ) {
 
 		// AMD. Register as an anonymous module.
@@ -41,7 +43,8 @@
 		// Browser globals
 		factory( jQuery );
 	}
-}( function( $ ) {
+} )( function( $ ) {
+"use strict";
 
 $.widget( "ui.dialog", {
 	version: "@VERSION",
@@ -948,4 +951,4 @@ if ( $.uiBackCompat !== false ) {
 
 return $.ui.dialog;
 
-} ) );
+} );
diff --git a/ui/widgets/draggable.js b/ui/widgets/draggable.js
index 5f41d2408..2a9666d4e 100644
--- a/ui/widgets/draggable.js
+++ b/ui/widgets/draggable.js
@@ -15,6 +15,8 @@
 //>>css.structure: ../../themes/base/draggable.css
 
 ( function( factory ) {
+	"use strict";
+
 	if ( typeof define === "function" && define.amd ) {
 
 		// AMD. Register as an anonymous module.
@@ -34,7 +36,8 @@
 		// Browser globals
 		factory( jQuery );
 	}
-}( function( $ ) {
+} )( function( $ ) {
+"use strict";
 
 $.widget( "ui.draggable", $.ui.mouse, {
 	version: "@VERSION",
@@ -201,7 +204,9 @@ $.widget( "ui.draggable", $.ui.mouse, {
 		this.originalPageY = event.pageY;
 
 		//Adjust the mouse offset relative to the helper if "cursorAt" is supplied
-		( o.cursorAt && this._adjustOffsetFromHelper( o.cursorAt ) );
+		if ( o.cursorAt ) {
+			this._adjustOffsetFromHelper( o.cursorAt );
+		}
 
 		//Set a containment if given in the options
 		this._setContainment();
@@ -1116,12 +1121,13 @@ $.ui.plugin.add( "draggable", "snap", {
 					!$.contains( inst.snapElements[ i ].item.ownerDocument,
 					inst.snapElements[ i ].item ) ) {
 				if ( inst.snapElements[ i ].snapping ) {
-					( inst.options.snap.release &&
+					if ( inst.options.snap.release ) {
 						inst.options.snap.release.call(
 							inst.element,
 							event,
 							$.extend( inst._uiHash(), { snapItem: inst.snapElements[ i ].item } )
-						) );
+						);
+					}
 				}
 				inst.snapElements[ i ].snapping = false;
 				continue;
@@ -1192,13 +1198,14 @@ $.ui.plugin.add( "draggable", "snap", {
 			}
 
 			if ( !inst.snapElements[ i ].snapping && ( ts || bs || ls || rs || first ) ) {
-				( inst.options.snap.snap &&
+				if ( inst.options.snap.snap ) {
 					inst.options.snap.snap.call(
 						inst.element,
 						event,
 						$.extend( inst._uiHash(), {
 							snapItem: inst.snapElements[ i ].item
-						} ) ) );
+						} ) );
+				}
 			}
 			inst.snapElements[ i ].snapping = ( ts || bs || ls || rs || first );
 
@@ -1216,7 +1223,9 @@ $.ui.plugin.add( "draggable", "stack", {
 					( parseInt( $( b ).css( "zIndex" ), 10 ) || 0 );
 			} );
 
-		if ( !group.length ) { return; }
+		if ( !group.length ) {
+			return;
+		}
 
 		min = parseInt( $( group[ 0 ] ).css( "zIndex" ), 10 ) || 0;
 		$( group ).each( function( i ) {
@@ -1247,4 +1256,4 @@ $.ui.plugin.add( "draggable", "zIndex", {
 
 return $.ui.draggable;
 
-} ) );
+} );
diff --git a/ui/widgets/droppable.js b/ui/widgets/droppable.js
index f98ff2714..01de767b4 100644
--- a/ui/widgets/droppable.js
+++ b/ui/widgets/droppable.js
@@ -14,6 +14,8 @@
 //>>demos: http://jqueryui.com/droppable/
 
 ( function( factory ) {
+	"use strict";
+
 	if ( typeof define === "function" && define.amd ) {
 
 		// AMD. Register as an anonymous module.
@@ -29,7 +31,8 @@
 		// Browser globals
 		factory( jQuery );
 	}
-}( function( $ ) {
+} )( function( $ ) {
+"use strict";
 
 $.widget( "ui.droppable", {
 	version: "@VERSION",
@@ -80,7 +83,9 @@ $.widget( "ui.droppable", {
 
 		this._addToManager( o.scope );
 
-		o.addClasses && this._addClass( "ui-droppable" );
+		if ( o.addClasses ) {
+			this._addClass( "ui-droppable" );
+		}
 
 	},
 
@@ -206,7 +211,8 @@ $.widget( "ui.droppable", {
 					)
 				) {
 					childrenIntersection = true;
-					return false; }
+					return false;
+				}
 			} );
 		if ( childrenIntersection ) {
 			return false;
@@ -494,4 +500,4 @@ if ( $.uiBackCompat !== false ) {
 
 return $.ui.droppable;
 
-} ) );
+} );
diff --git a/ui/widgets/menu.js b/ui/widgets/menu.js
index 3b17112f8..2bc37789b 100644
--- a/ui/widgets/menu.js
+++ b/ui/widgets/menu.js
@@ -17,6 +17,8 @@
 //>>css.theme: ../../themes/base/theme.css
 
 ( function( factory ) {
+	"use strict";
+
 	if ( typeof define === "function" && define.amd ) {
 
 		// AMD. Register as an anonymous module.
@@ -34,7 +36,8 @@
 		// Browser globals
 		factory( jQuery );
 	}
-}( function( $ ) {
+} )( function( $ ) {
+"use strict";
 
 return $.widget( "ui.menu", {
 	version: "@VERSION",
@@ -707,4 +710,4 @@ return $.widget( "ui.menu", {
 	}
 } );
 
-} ) );
+} );
diff --git a/ui/widgets/mouse.js b/ui/widgets/mouse.js
index 0ae8979a1..1efcf08db 100644
--- a/ui/widgets/mouse.js
+++ b/ui/widgets/mouse.js
@@ -13,6 +13,8 @@
 //>>docs: http://api.jqueryui.com/mouse/
 
 ( function( factory ) {
+	"use strict";
+
 	if ( typeof define === "function" && define.amd ) {
 
 		// AMD. Register as an anonymous module.
@@ -27,7 +29,8 @@
 		// Browser globals
 		factory( jQuery );
 	}
-}( function( $ ) {
+} )( function( $ ) {
+"use strict";
 
 var mouseHandled = false;
 $( document ).on( "mouseup", function() {
@@ -80,7 +83,9 @@ return $.widget( "ui.mouse", {
 		this._mouseMoved = false;
 
 		// We may have missed mouseup (out of window)
-		( this._mouseStarted && this._mouseUp( event ) );
+		if ( this._mouseStarted ) {
+			this._mouseUp( event );
+		}
 
 		this._mouseDownEvent = event;
 
@@ -173,7 +178,11 @@ return $.widget( "ui.mouse", {
 		if ( this._mouseDistanceMet( event ) && this._mouseDelayMet( event ) ) {
 			this._mouseStarted =
 				( this._mouseStart( this._mouseDownEvent, event ) !== false );
-			( this._mouseStarted ? this._mouseDrag( event ) : this._mouseUp( event ) );
+			if ( this._mouseStarted ) {
+				this._mouseDrag( event );
+			} else {
+				this._mouseUp( event );
+			}
 		}
 
 		return !this._mouseStarted;
@@ -220,7 +229,9 @@ return $.widget( "ui.mouse", {
 	_mouseStart: function( /* event */ ) {},
 	_mouseDrag: function( /* event */ ) {},
 	_mouseStop: function( /* event */ ) {},
-	_mouseCapture: function( /* event */ ) { return true; }
+	_mouseCapture: function( /* event */ ) {
+		return true;
+	}
 } );
 
-} ) );
+} );
diff --git a/ui/widgets/progressbar.js b/ui/widgets/progressbar.js
index dd7ee3143..e39bc2fcb 100644
--- a/ui/widgets/progressbar.js
+++ b/ui/widgets/progressbar.js
@@ -9,9 +9,9 @@
 
 //>>label: Progressbar
 //>>group: Widgets
-// jscs:disable maximumLineLength
+/* eslint-disable max-len */
 //>>description: Displays a status indicator for loading state, standard percentage, and other progress indicators.
-// jscs:enable maximumLineLength
+/* eslint-enable max-len */
 //>>docs: http://api.jqueryui.com/progressbar/
 //>>demos: http://jqueryui.com/progressbar/
 //>>css.structure: ../../themes/base/core.css
@@ -19,6 +19,8 @@
 //>>css.theme: ../../themes/base/theme.css
 
 ( function( factory ) {
+	"use strict";
+
 	if ( typeof define === "function" && define.amd ) {
 
 		// AMD. Register as an anonymous module.
@@ -32,7 +34,8 @@
 		// Browser globals
 		factory( jQuery );
 	}
-}( function( $ ) {
+} )( function( $ ) {
+"use strict";
 
 return $.widget( "ui.progressbar", {
 	version: "@VERSION",
@@ -175,4 +178,4 @@ return $.widget( "ui.progressbar", {
 	}
 } );
 
-} ) );
+} );
diff --git a/ui/widgets/resizable.js b/ui/widgets/resizable.js
index 222c93a5e..13e98c658 100644
--- a/ui/widgets/resizable.js
+++ b/ui/widgets/resizable.js
@@ -17,6 +17,8 @@
 //>>css.theme: ../../themes/base/theme.css
 
 ( function( factory ) {
+	"use strict";
+
 	if ( typeof define === "function" && define.amd ) {
 
 		// AMD. Register as an anonymous module.
@@ -33,7 +35,8 @@
 		// Browser globals
 		factory( jQuery );
 	}
-}( function( $ ) {
+} )( function( $ ) {
+"use strict";
 
 $.widget( "ui.resizable", $.ui.mouse, {
 	version: "@VERSION",
@@ -91,9 +94,15 @@ $.widget( "ui.resizable", $.ui.mouse, {
 		// TODO: determine which cases actually cause this to happen
 		// if the element doesn't have the scroll set, see if it's possible to
 		// set the scroll
-		el[ scroll ] = 1;
-		has = ( el[ scroll ] > 0 );
-		el[ scroll ] = 0;
+		try {
+			el[ scroll ] = 1;
+			has = ( el[ scroll ] > 0 );
+			el[ scroll ] = 0;
+		} catch ( e ) {
+
+			// `el` might be a string, then setting `scroll` will throw
+			// an error in strict mode; ignore it.
+		}
 		return has;
 	},
 
@@ -776,7 +785,9 @@ $.widget( "ui.resizable", $.ui.mouse, {
 
 	_propagate: function( n, event ) {
 		$.ui.plugin.call( this, n, [ event, this.ui() ] );
-		( n !== "resize" && this._trigger( n, event, this.ui() ) );
+		if ( n !== "resize" ) {
+			this._trigger( n, event, this.ui() );
+		}
 	},
 
 	plugins: {},
@@ -897,8 +908,8 @@ $.ui.plugin.add( "resizable", "containment", {
 			co = that.containerOffset;
 			ch = that.containerSize.height;
 			cw = that.containerSize.width;
-			width = ( that._hasScroll ( ce, "left" ) ? ce.scrollWidth : cw );
-			height = ( that._hasScroll ( ce ) ? ce.scrollHeight : ch ) ;
+			width = ( that._hasScroll( ce, "left" ) ? ce.scrollWidth : cw );
+			height = ( that._hasScroll( ce ) ? ce.scrollHeight : ch );
 
 			that.parentData = {
 				element: ce,
@@ -1205,4 +1216,4 @@ $.ui.plugin.add( "resizable", "grid", {
 
 return $.ui.resizable;
 
-} ) );
+} );
diff --git a/ui/widgets/selectable.js b/ui/widgets/selectable.js
index ed980cc49..b8e29517c 100644
--- a/ui/widgets/selectable.js
+++ b/ui/widgets/selectable.js
@@ -15,6 +15,8 @@
 //>>css.structure: ../../themes/base/selectable.css
 
 ( function( factory ) {
+	"use strict";
+
 	if ( typeof define === "function" && define.amd ) {
 
 		// AMD. Register as an anonymous module.
@@ -29,7 +31,8 @@
 		// Browser globals
 		factory( jQuery );
 	}
-}( function( $ ) {
+} )( function( $ ) {
+"use strict";
 
 return $.widget( "ui.selectable", $.ui.mouse, {
 	version: "@VERSION",
@@ -183,8 +186,12 @@ return $.widget( "ui.selectable", $.ui.mouse, {
 			x2 = event.pageX,
 			y2 = event.pageY;
 
-		if ( x1 > x2 ) { tmp = x2; x2 = x1; x1 = tmp; }
-		if ( y1 > y2 ) { tmp = y2; y2 = y1; y1 = tmp; }
+		if ( x1 > x2 ) {
+			tmp = x2; x2 = x1; x1 = tmp;
+		}
+		if ( y1 > y2 ) {
+			tmp = y2; y2 = y1; y1 = tmp;
+		}
 		this.helper.css( { left: x1, top: y1, width: x2 - x1, height: y2 - y1 } );
 
 		this.selectees.each( function() {
@@ -307,4 +314,4 @@ return $.widget( "ui.selectable", $.ui.mouse, {
 
 } );
 
-} ) );
+} );
diff --git a/ui/widgets/selectmenu.js b/ui/widgets/selectmenu.js
index cc98ecbbf..cefeddcac 100644
--- a/ui/widgets/selectmenu.js
+++ b/ui/widgets/selectmenu.js
@@ -9,9 +9,9 @@
 
 //>>label: Selectmenu
 //>>group: Widgets
-// jscs:disable maximumLineLength
+/* eslint-disable max-len */
 //>>description: Duplicates and extends the functionality of a native HTML select element, allowing it to be customizable in behavior and appearance far beyond the limitations of a native select.
-// jscs:enable maximumLineLength
+/* eslint-enable max-len */
 //>>docs: http://api.jqueryui.com/selectmenu/
 //>>demos: http://jqueryui.com/selectmenu/
 //>>css.structure: ../../themes/base/core.css
@@ -19,6 +19,8 @@
 //>>css.theme: ../../themes/base/theme.css
 
 ( function( factory ) {
+	"use strict";
+
 	if ( typeof define === "function" && define.amd ) {
 
 		// AMD. Register as an anonymous module.
@@ -38,7 +40,8 @@
 		// Browser globals
 		factory( jQuery );
 	}
-}( function( $ ) {
+} )( function( $ ) {
+"use strict";
 
 return $.widget( "ui.selectmenu", [ $.ui.formResetMixin, {
 	version: "@VERSION",
@@ -687,4 +690,4 @@ return $.widget( "ui.selectmenu", [ $.ui.formResetMixin, {
 	}
 } ] );
 
-} ) );
+} );
diff --git a/ui/widgets/slider.js b/ui/widgets/slider.js
index e5004573a..ec2c2877e 100644
--- a/ui/widgets/slider.js
+++ b/ui/widgets/slider.js
@@ -17,6 +17,8 @@
 //>>css.theme: ../../themes/base/theme.css
 
 ( function( factory ) {
+	"use strict";
+
 	if ( typeof define === "function" && define.amd ) {
 
 		// AMD. Register as an anonymous module.
@@ -32,7 +34,8 @@
 		// Browser globals
 		factory( jQuery );
 	}
-}( function( $ ) {
+} )( function( $ ) {
+"use strict";
 
 return $.widget( "ui.slider", $.ui.mouse, {
 	version: "@VERSION",
@@ -749,4 +752,4 @@ return $.widget( "ui.slider", $.ui.mouse, {
 	}
 } );
 
-} ) );
+} );
diff --git a/ui/widgets/sortable.js b/ui/widgets/sortable.js
index b7daf00bf..f44b4832a 100644
--- a/ui/widgets/sortable.js
+++ b/ui/widgets/sortable.js
@@ -15,6 +15,8 @@
 //>>css.structure: ../../themes/base/sortable.css
 
 ( function( factory ) {
+	"use strict";
+
 	if ( typeof define === "function" && define.amd ) {
 
 		// AMD. Register as an anonymous module.
@@ -32,7 +34,8 @@
 		// Browser globals
 		factory( jQuery );
 	}
-}( function( $ ) {
+} )( function( $ ) {
+"use strict";
 
 return $.widget( "ui.sortable", $.ui.mouse, {
 	version: "@VERSION",
@@ -239,7 +242,9 @@ return $.widget( "ui.sortable", $.ui.mouse, {
 		this.cssPosition = this.helper.css( "position" );
 
 		//Adjust the mouse offset relative to the helper if "cursorAt" is supplied
-		( o.cursorAt && this._adjustOffsetFromHelper( o.cursorAt ) );
+		if ( o.cursorAt ) {
+			this._adjustOffsetFromHelper( o.cursorAt );
+		}
 
 		//Cache the former DOM position
 		this.domPosition = {
@@ -695,8 +700,8 @@ return $.widget( "ui.sortable", $.ui.mouse, {
 		horizontalDirection = this.dragDirection.horizontal;
 
 		return this.floating ?
-			( ( horizontalDirection === "right" || verticalDirection === "down" ) ? 2 : 1 )
-			: ( verticalDirection && ( verticalDirection === "down" ? 2 : 1 ) );
+			( ( horizontalDirection === "right" || verticalDirection === "down" ) ? 2 : 1 ) :
+			( verticalDirection && ( verticalDirection === "down" ? 2 : 1 ) );
 
 	},
 
@@ -1093,9 +1098,11 @@ return $.widget( "ui.sortable", $.ui.mouse, {
 				return;
 			}
 
-			itemWithLeastDistance ?
-				this._rearrange( event, itemWithLeastDistance, null, true ) :
+			if ( itemWithLeastDistance ) {
+				this._rearrange( event, itemWithLeastDistance, null, true );
+			} else {
 				this._rearrange( event, null, this.containers[ innermostIndex ].element, true );
+			}
 			this._trigger( "change", event, this._uiHash() );
 			this.containers[ innermostIndex ]._trigger( "change", event, this._uiHash( this ) );
 			this.currentContainer = this.containers[ innermostIndex ];
@@ -1435,9 +1442,12 @@ return $.widget( "ui.sortable", $.ui.mouse, {
 
 	_rearrange: function( event, i, a, hardRefresh ) {
 
-		a ? a[ 0 ].appendChild( this.placeholder[ 0 ] ) :
+		if ( a ) {
+			a[ 0 ].appendChild( this.placeholder[ 0 ] );
+		} else {
 			i.item[ 0 ].parentNode.insertBefore( this.placeholder[ 0 ],
 				( this.direction === "down" ? i.item[ 0 ] : i.item[ 0 ].nextSibling ) );
+		}
 
 		//Various things done here to improve the performance:
 		// 1. we create a setTimeout, that calls refreshPositions
@@ -1603,4 +1613,4 @@ return $.widget( "ui.sortable", $.ui.mouse, {
 
 } );
 
-} ) );
+} );
diff --git a/ui/widgets/spinner.js b/ui/widgets/spinner.js
index 6b860e785..1bd69b6d8 100644
--- a/ui/widgets/spinner.js
+++ b/ui/widgets/spinner.js
@@ -17,6 +17,8 @@
 //>>css.theme: ../../themes/base/theme.css
 
 ( function( factory ) {
+	"use strict";
+
 	if ( typeof define === "function" && define.amd ) {
 
 		// AMD. Register as an anonymous module.
@@ -33,7 +35,8 @@
 		// Browser globals
 		factory( jQuery );
 	}
-}( function( $ ) {
+} )( function( $ ) {
+"use strict";
 
 function spinnerModifier( fn ) {
 	return function() {
@@ -576,4 +579,4 @@ if ( $.uiBackCompat !== false ) {
 
 return $.ui.spinner;
 
-} ) );
+} );
diff --git a/ui/widgets/tabs.js b/ui/widgets/tabs.js
index 7a53767dd..9e4236ab3 100644
--- a/ui/widgets/tabs.js
+++ b/ui/widgets/tabs.js
@@ -17,6 +17,8 @@
 //>>css.theme: ../../themes/base/theme.css
 
 ( function( factory ) {
+	"use strict";
+
 	if ( typeof define === "function" && define.amd ) {
 
 		// AMD. Register as an anonymous module.
@@ -33,7 +35,8 @@
 		// Browser globals
 		factory( jQuery );
 	}
-}( function( $ ) {
+} )( function( $ ) {
+"use strict";
 
 $.widget( "ui.tabs", {
 	version: "@VERSION",
@@ -919,4 +922,4 @@ if ( $.uiBackCompat !== false ) {
 
 return $.ui.tabs;
 
-} ) );
+} );
diff --git a/ui/widgets/tooltip.js b/ui/widgets/tooltip.js
index cd031ceb2..f1cea47d1 100644
--- a/ui/widgets/tooltip.js
+++ b/ui/widgets/tooltip.js
@@ -17,6 +17,8 @@
 //>>css.theme: ../../themes/base/theme.css
 
 ( function( factory ) {
+	"use strict";
+
 	if ( typeof define === "function" && define.amd ) {
 
 		// AMD. Register as an anonymous module.
@@ -33,7 +35,8 @@
 		// Browser globals
 		factory( jQuery );
 	}
-}( function( $ ) {
+} )( function( $ ) {
+"use strict";
 
 $.widget( "ui.tooltip", {
 	version: "@VERSION",
@@ -518,4 +521,4 @@ if ( $.uiBackCompat !== false ) {
 
 return $.ui.tooltip;
 
-} ) );
+} );