diff --git a/modules/ve-mw/ui/dialogs/ve.ui.MWBetaWelcomeDialog.js b/modules/ve-mw/ui/dialogs/ve.ui.MWBetaWelcomeDialog.js
index b279376592..b4adf40fd1 100644
--- a/modules/ve-mw/ui/dialogs/ve.ui.MWBetaWelcomeDialog.js
+++ b/modules/ve-mw/ui/dialogs/ve.ui.MWBetaWelcomeDialog.js
@@ -17,7 +17,7 @@
  */
 ve.ui.MWBetaWelcomeDialog = function VeUiMWBetaWelcomeDialog( surface, config ) {
 	// Configuration initialization
-	config = ve.extendObject( {}, config, { 'small': true, 'footless': false } );
+	config = ve.extendObject( { 'small': true, 'footless': false }, config );
 
 	// Parent constructor
 	ve.ui.MWDialog.call( this, surface, config );
diff --git a/modules/ve-mw/ui/dialogs/ve.ui.MWMediaInsertDialog.js b/modules/ve-mw/ui/dialogs/ve.ui.MWMediaInsertDialog.js
index c0155810f7..ef5053726f 100644
--- a/modules/ve-mw/ui/dialogs/ve.ui.MWMediaInsertDialog.js
+++ b/modules/ve-mw/ui/dialogs/ve.ui.MWMediaInsertDialog.js
@@ -17,7 +17,7 @@
  */
 ve.ui.MWMediaInsertDialog = function VeUiMWMediaInsertDialog( surface, config ) {
 	// Configuration initialization
-	config = ve.extendObject( {}, config, { 'footless': true } );
+	config = ve.extendObject( { 'footless': true }, config );
 
 	// Parent constructor
 	ve.ui.MWDialog.call( this, surface, config );
diff --git a/modules/ve-mw/ui/dialogs/ve.ui.MWTransclusionDialog.js b/modules/ve-mw/ui/dialogs/ve.ui.MWTransclusionDialog.js
index f4d45eb2a8..9185995d4f 100644
--- a/modules/ve-mw/ui/dialogs/ve.ui.MWTransclusionDialog.js
+++ b/modules/ve-mw/ui/dialogs/ve.ui.MWTransclusionDialog.js
@@ -21,7 +21,7 @@
  */
 ve.ui.MWTransclusionDialog = function VeUiMWTransclusionDialog( surface, config ) {
 	// Configuration initialization
-	config = ve.extendObject( {}, config, {
+	config = ve.extendObject( {
 		'editable': true,
 		'adders': [
 			{
@@ -35,7 +35,7 @@ ve.ui.MWTransclusionDialog = function VeUiMWTransclusionDialog( surface, config
 				'title': ve.msg( 'visualeditor-dialog-transclusion-add-content' )
 			}
 		]
-	} );
+	}, config );
 
 	// Parent constructor
 	ve.ui.MWDialog.call( this, surface, config );
diff --git a/modules/ve-mw/ui/widgets/ve.ui.MWCategoryPopupWidget.js b/modules/ve-mw/ui/widgets/ve.ui.MWCategoryPopupWidget.js
index bd10559fd4..b61f1e16e9 100644
--- a/modules/ve-mw/ui/widgets/ve.ui.MWCategoryPopupWidget.js
+++ b/modules/ve-mw/ui/widgets/ve.ui.MWCategoryPopupWidget.js
@@ -16,7 +16,7 @@
  */
 ve.ui.MWCategoryPopupWidget = function VeUiMWCategoryPopupWidget ( config ) {
 	// Configuration initialization
-	config = ve.extendObject( {}, config, { 'autoClose': true } );
+	config = ve.extendObject( { 'autoClose': true }, config );
 
 	// Parent constructor
 	ve.ui.PopupWidget.call( this, config );
@@ -56,11 +56,6 @@ ve.ui.MWCategoryPopupWidget = function VeUiMWCategoryPopupWidget ( config ) {
 	config.$overlay.append( this.$ );
 };
 
-/**
- * @private
- * @cfg {boolean} [autoClose=true] Overridden in this subclass
- */
-
 /* Inheritance */
 
 ve.inheritClass( ve.ui.MWCategoryPopupWidget, ve.ui.PopupWidget );
diff --git a/modules/ve-mw/ui/widgets/ve.ui.MWMediaSearchWidget.js b/modules/ve-mw/ui/widgets/ve.ui.MWMediaSearchWidget.js
index 990f848312..c7f1f0ece1 100755
--- a/modules/ve-mw/ui/widgets/ve.ui.MWMediaSearchWidget.js
+++ b/modules/ve-mw/ui/widgets/ve.ui.MWMediaSearchWidget.js
@@ -19,10 +19,10 @@
  */
 ve.ui.MWMediaSearchWidget = function VeUiMWMediaSearchWidget( config ) {
 	// Configuration intialization
-	config = ve.extendObject( {}, config, {
+	config = ve.extendObject( {
 		'placeholder': ve.msg( 'visualeditor-media-input-placeholder' ),
 		'value': mw.config.get( 'wgTitle' )
-	} );
+	}, config );
 
 	// Parent constructor
 	ve.ui.SearchWidget.call( this, config );
diff --git a/modules/ve-mw/ui/widgets/ve.ui.MWParameterResultWidget.js b/modules/ve-mw/ui/widgets/ve.ui.MWParameterResultWidget.js
index 8936fe4a47..299ff2b1cc 100644
--- a/modules/ve-mw/ui/widgets/ve.ui.MWParameterResultWidget.js
+++ b/modules/ve-mw/ui/widgets/ve.ui.MWParameterResultWidget.js
@@ -17,7 +17,7 @@
  */
 ve.ui.MWParameterResultWidget = function VeUiMWParameterResultWidget( data, config ) {
 	// Configuration initialization
-	config = ve.extendObject( {}, config, { 'icon': 'parameter' } );
+	config = ve.extendObject( { 'icon': 'parameter' }, config );
 
 	// Parent constructor
 	ve.ui.OptionWidget.call( this, data, config );
@@ -27,11 +27,6 @@ ve.ui.MWParameterResultWidget = function VeUiMWParameterResultWidget( data, conf
 	this.setLabel( this.buildLabel() );
 };
 
-/**
- * @private
- * @cfg {string} icon
- */
-
 /* Inheritance */
 
 ve.inheritClass( ve.ui.MWParameterResultWidget, ve.ui.OptionWidget );
diff --git a/modules/ve-mw/ui/widgets/ve.ui.MWParameterSearchWidget.js b/modules/ve-mw/ui/widgets/ve.ui.MWParameterSearchWidget.js
index 591afb6394..e685b08436 100644
--- a/modules/ve-mw/ui/widgets/ve.ui.MWParameterSearchWidget.js
+++ b/modules/ve-mw/ui/widgets/ve.ui.MWParameterSearchWidget.js
@@ -16,9 +16,9 @@
  */
 ve.ui.MWParameterSearchWidget = function VeUiMWParameterSearchWidget( template, config ) {
 	// Configuration intialization
-	config = ve.extendObject( {}, config, {
+	config = ve.extendObject( {
 		'placeholder': ve.msg( 'visualeditor-parameter-input-placeholder' )
-	} );
+	}, config );
 
 	// Parent constructor
 	ve.ui.SearchWidget.call( this, config );
diff --git a/modules/ve-mw/ui/widgets/ve.ui.MWReferenceSearchWidget.js b/modules/ve-mw/ui/widgets/ve.ui.MWReferenceSearchWidget.js
index bd61cabac6..3fd7207b15 100644
--- a/modules/ve-mw/ui/widgets/ve.ui.MWReferenceSearchWidget.js
+++ b/modules/ve-mw/ui/widgets/ve.ui.MWReferenceSearchWidget.js
@@ -17,9 +17,9 @@
  */
 ve.ui.MWReferenceSearchWidget = function VeUiMWReferenceSearchWidget( surface, config ) {
 	// Configuration intialization
-	config = ve.extendObject( {}, config, {
+	config = ve.extendObject( {
 		'placeholder': ve.msg( 'visualeditor-reference-input-placeholder' )
-	} );
+	}, config );
 
 	// Parent constructor
 	ve.ui.SearchWidget.call( this, config );
diff --git a/modules/ve/ui/layouts/ve.ui.StackPanelLayout.js b/modules/ve/ui/layouts/ve.ui.StackPanelLayout.js
index 2b14581b02..4b2ea9bace 100644
--- a/modules/ve/ui/layouts/ve.ui.StackPanelLayout.js
+++ b/modules/ve/ui/layouts/ve.ui.StackPanelLayout.js
@@ -18,7 +18,7 @@
  */
 ve.ui.StackPanelLayout = function VeUiStackPanelLayout( config ) {
 	// Config initialization
-	config = ve.extendObject( config, { 'scrollable': true } );
+	config = ve.extendObject( { 'scrollable': true }, config );
 
 	// Parent constructor
 	ve.ui.PanelLayout.call( this, config );
diff --git a/modules/ve/ui/widgets/ve.ui.MenuItemWidget.js b/modules/ve/ui/widgets/ve.ui.MenuItemWidget.js
index 4e51c8c1cf..607299ace3 100644
--- a/modules/ve/ui/widgets/ve.ui.MenuItemWidget.js
+++ b/modules/ve/ui/widgets/ve.ui.MenuItemWidget.js
@@ -17,7 +17,7 @@
  */
 ve.ui.MenuItemWidget = function VeUiMenuItemWidget( data, config ) {
 	// Configuration initialization
-	config = ve.extendObject( {}, config, { 'icon': 'check' } );
+	config = ve.extendObject( { 'icon': 'check' }, config );
 
 	// Parent constructor
 	ve.ui.OptionWidget.call( this, data, config );
@@ -26,11 +26,6 @@ ve.ui.MenuItemWidget = function VeUiMenuItemWidget( data, config ) {
 	this.$.addClass( 've-ui-menuItemWidget' );
 };
 
-/**
- * @private
- * @cfg {string} icon
- */
-
 /* Inheritance */
 
 ve.inheritClass( ve.ui.MenuItemWidget, ve.ui.OptionWidget );