jquery
diff --git a/.travis.yml b/.travis.yml
@@ -1,10 +1,9 @@
 language: node_js
 sudo: false
 node_js:
-- "6"
 - "8"
 - "10"
-- "11"
+- "12"
 addons:
   chrome: stable
 env:

diff --git a/dist/jquery.js b/dist/jquery.js
@@ -1,5 +1,5 @@
 /*!
- * jQuery JavaScript Library v3.4.0
+ * jQuery JavaScript Library v3.4.1
  * https://jquery.com/
  *
  * Includes Sizzle.js
@@ -9,7 +9,7 @@
  * Released under the MIT license
  * https://jquery.org/license
  *
- * Date: 2019-04-10T19:48Z
+ * Date: 2019-05-01T21:04Z
  */
 ( function( global, factory ) {
 
@@ -142,7 +142,7 @@ function toType( obj ) {
 
 
 var
-	version = "3.4.0",
+	version = "3.4.1",
 
 	// Define a local copy of jQuery
 	jQuery = function( selector, context ) {
@@ -4498,8 +4498,12 @@ var documentElement = document.documentElement;
 		},
 		composed = { composed: true };
 
+	// Support: IE 9 - 11+, Edge 12 - 18+, iOS 10.0 - 10.2 only
 	// Check attachment across shadow DOM boundaries when possible (gh-3504)
-	if ( documentElement.attachShadow ) {
+	// Support: iOS 10.0-10.2 only
+	// Early iOS 10 versions support `attachShadow` but not `getRootNode`,
+	// leading to errors. We need to check for `getRootNode`.
+	if ( documentElement.getRootNode ) {
 		isAttached = function( elem ) {
 			return jQuery.contains( elem.ownerDocument, elem ) ||
 				elem.getRootNode( composed ) === elem.ownerDocument;
@@ -5359,8 +5363,7 @@ jQuery.event = {
 
 				// Claim the first handler
 				if ( rcheckableType.test( el.type ) &&
-					el.click && nodeName( el, "input" ) &&
-					dataPriv.get( el, "click" ) === undefined ) {
+					el.click && nodeName( el, "input" ) ) {
 
 					// dataPriv.set( el, "click", ... )
 					leverageNative( el, "click", returnTrue );
@@ -5377,8 +5380,7 @@ jQuery.event = {
 
 				// Force setup before triggering a click
 				if ( rcheckableType.test( el.type ) &&
-					el.click && nodeName( el, "input" ) &&
-					dataPriv.get( el, "click" ) === undefined ) {
+					el.click && nodeName( el, "input" ) ) {
 
 					leverageNative( el, "click" );
 				}
@@ -5419,7 +5421,9 @@ function leverageNative( el, type, expectSync ) {
 
 	// Missing expectSync indicates a trigger call, which must force setup through jQuery.event.add
 	if ( !expectSync ) {
-		jQuery.event.add( el, type, returnTrue );
+		if ( dataPriv.get( el, type ) === undefined ) {
+			jQuery.event.add( el, type, returnTrue );
+		}
 		return;
 	}
 
@@ -5434,9 +5438,13 @@ function leverageNative( el, type, expectSync ) {
 			if ( ( event.isTrigger & 1 ) && this[ type ] ) {
 
 				// Interrupt processing of the outer synthetic .trigger()ed event
-				if ( !saved ) {
+				// Saved data should be false in such cases, but might be a leftover capture object
+				// from an async native handler (gh-4350)
+				if ( !saved.length ) {
 
 					// Store arguments for use when handling the inner native event
+					// There will always be at least one argument (an event object), so this array
+					// will not be confused with a leftover capture object.
 					saved = slice.call( arguments );
 					dataPriv.set( this, type, saved );
 
@@ -5449,14 +5457,14 @@ function leverageNative( el, type, expectSync ) {
 					if ( saved !== result || notAsync ) {
 						dataPriv.set( this, type, false );
 					} else {
-						result = undefined;
+						result = {};
 					}
 					if ( saved !== result ) {
 
 						// Cancel the outer synthetic event
 						event.stopImmediatePropagation();
 						event.preventDefault();
-						return result;
+						return result.value;
 					}
 
 				// If this is an inner synthetic event for an event with a bubbling surrogate
@@ -5471,17 +5479,19 @@ function leverageNative( el, type, expectSync ) {
 
 			// If this is a native event triggered above, everything is now in order
 			// Fire an inner synthetic event with the original arguments
-			} else if ( saved ) {
+			} else if ( saved.length ) {
 
 				// ...and capture the result
-				dataPriv.set( this, type, jQuery.event.trigger(
-
-					// Support: IE <=9 - 11+
-					// Extend with the prototype to reset the above stopImmediatePropagation()
-					jQuery.extend( saved.shift(), jQuery.Event.prototype ),
-					saved,
-					this
-				) );
+				dataPriv.set( this, type, {
+					value: jQuery.event.trigger(
+
+						// Support: IE <=9 - 11+
+						// Extend with the prototype to reset the above stopImmediatePropagation()
+						jQuery.extend( saved[ 0 ], jQuery.Event.prototype ),
+						saved.slice( 1 ),
+						this
+					)
+				} );
 
 				// Abort handling of the native event
 				event.stopImmediatePropagation();

diff --git a/dist/jquery.min.js b/dist/jquery.min.js
diff --git a/dist/jquery.min.map b/dist/jquery.min.map
diff --git a/dist/jquery.slim.js b/dist/jquery.slim.js
@@ -1,5 +1,5 @@
 /*!
- * jQuery JavaScript Library v3.4.0 -ajax,-ajax/jsonp,-ajax/load,-ajax/parseXML,-ajax/script,-ajax/var/location,-ajax/var/nonce,-ajax/var/rquery,-ajax/xhr,-manipulation/_evalUrl,-event/ajax,-effects,-effects/Tween,-effects/animatedSelector
+ * jQuery JavaScript Library v3.4.1 -ajax,-ajax/jsonp,-ajax/load,-ajax/parseXML,-ajax/script,-ajax/var/location,-ajax/var/nonce,-ajax/var/rquery,-ajax/xhr,-manipulation/_evalUrl,-event/ajax,-effects,-effects/Tween,-effects/animatedSelector
  * https://jquery.com/
  *
  * Includes Sizzle.js
@@ -9,7 +9,7 @@
  * Released under the MIT license
  * https://jquery.org/license
  *
- * Date: 2019-04-10T19:49Z
+ * Date: 2019-05-01T21:04Z
  */
 ( function( global, factory ) {
 
@@ -142,7 +142,7 @@ function toType( obj ) {
 
 
 var
-	version = "3.4.0 -ajax,-ajax/jsonp,-ajax/load,-ajax/parseXML,-ajax/script,-ajax/var/location,-ajax/var/nonce,-ajax/var/rquery,-ajax/xhr,-manipulation/_evalUrl,-event/ajax,-effects,-effects/Tween,-effects/animatedSelector",
+	version = "3.4.1 -ajax,-ajax/jsonp,-ajax/load,-ajax/parseXML,-ajax/script,-ajax/var/location,-ajax/var/nonce,-ajax/var/rquery,-ajax/xhr,-manipulation/_evalUrl,-event/ajax,-effects,-effects/Tween,-effects/animatedSelector",
 
 	// Define a local copy of jQuery
 	jQuery = function( selector, context ) {
@@ -4498,8 +4498,12 @@ var documentElement = document.documentElement;
 		},
 		composed = { composed: true };
 
+	// Support: IE 9 - 11+, Edge 12 - 18+, iOS 10.0 - 10.2 only
 	// Check attachment across shadow DOM boundaries when possible (gh-3504)
-	if ( documentElement.attachShadow ) {
+	// Support: iOS 10.0-10.2 only
+	// Early iOS 10 versions support `attachShadow` but not `getRootNode`,
+	// leading to errors. We need to check for `getRootNode`.
+	if ( documentElement.getRootNode ) {
 		isAttached = function( elem ) {
 			return jQuery.contains( elem.ownerDocument, elem ) ||
 				elem.getRootNode( composed ) === elem.ownerDocument;
@@ -5359,8 +5363,7 @@ jQuery.event = {
 
 				// Claim the first handler
 				if ( rcheckableType.test( el.type ) &&
-					el.click && nodeName( el, "input" ) &&
-					dataPriv.get( el, "click" ) === undefined ) {
+					el.click && nodeName( el, "input" ) ) {
 
 					// dataPriv.set( el, "click", ... )
 					leverageNative( el, "click", returnTrue );
@@ -5377,8 +5380,7 @@ jQuery.event = {
 
 				// Force setup before triggering a click
 				if ( rcheckableType.test( el.type ) &&
-					el.click && nodeName( el, "input" ) &&
-					dataPriv.get( el, "click" ) === undefined ) {
+					el.click && nodeName( el, "input" ) ) {
 
 					leverageNative( el, "click" );
 				}
@@ -5419,7 +5421,9 @@ function leverageNative( el, type, expectSync ) {
 
 	// Missing expectSync indicates a trigger call, which must force setup through jQuery.event.add
 	if ( !expectSync ) {
-		jQuery.event.add( el, type, returnTrue );
+		if ( dataPriv.get( el, type ) === undefined ) {
+			jQuery.event.add( el, type, returnTrue );
+		}
 		return;
 	}
 
@@ -5434,9 +5438,13 @@ function leverageNative( el, type, expectSync ) {
 			if ( ( event.isTrigger & 1 ) && this[ type ] ) {
 
 				// Interrupt processing of the outer synthetic .trigger()ed event
-				if ( !saved ) {
+				// Saved data should be false in such cases, but might be a leftover capture object
+				// from an async native handler (gh-4350)
+				if ( !saved.length ) {
 
 					// Store arguments for use when handling the inner native event
+					// There will always be at least one argument (an event object), so this array
+					// will not be confused with a leftover capture object.
 					saved = slice.call( arguments );
 					dataPriv.set( this, type, saved );
 
@@ -5449,14 +5457,14 @@ function leverageNative( el, type, expectSync ) {
 					if ( saved !== result || notAsync ) {
 						dataPriv.set( this, type, false );
 					} else {
-						result = undefined;
+						result = {};
 					}
 					if ( saved !== result ) {
 
 						// Cancel the outer synthetic event
 						event.stopImmediatePropagation();
 						event.preventDefault();
-						return result;
+						return result.value;
 					}
 
 				// If this is an inner synthetic event for an event with a bubbling surrogate
@@ -5471,17 +5479,19 @@ function leverageNative( el, type, expectSync ) {
 
 			// If this is a native event triggered above, everything is now in order
 			// Fire an inner synthetic event with the original arguments
-			} else if ( saved ) {
+			} else if ( saved.length ) {
 
 				// ...and capture the result
-				dataPriv.set( this, type, jQuery.event.trigger(
-
-					// Support: IE <=9 - 11+
-					// Extend with the prototype to reset the above stopImmediatePropagation()
-					jQuery.extend( saved.shift(), jQuery.Event.prototype ),
-					saved,
-					this
-				) );
+				dataPriv.set( this, type, {
+					value: jQuery.event.trigger(
+
+						// Support: IE <=9 - 11+
+						// Extend with the prototype to reset the above stopImmediatePropagation()
+						jQuery.extend( saved[ 0 ], jQuery.Event.prototype ),
+						saved.slice( 1 ),
+						this
+					)
+				} );
 
 				// Abort handling of the native event
 				event.stopImmediatePropagation();

diff --git a/dist/jquery.slim.min.js b/dist/jquery.slim.min.js
diff --git a/dist/jquery.slim.min.map b/dist/jquery.slim.min.map
diff --git a/package.json b/package.json
@@ -2,12 +2,12 @@
   "name": "jquery",
   "title": "jQuery",
   "description": "JavaScript library for DOM operations",
-  "version": "3.4.0",
+  "version": "3.4.1",
   "main": "dist/jquery.js",
   "homepage": "https://jquery.com",
   "author": {
     "name": "JS Foundation and other contributors",
-    "url": "https://github.com/jquery/jquery/blob/3.4.0/AUTHORS.txt"
+    "url": "https://github.com/jquery/jquery/blob/3.4.1/AUTHORS.txt"
   },
   "repository": {
     "type": "git",

diff --git a/src/.eslintrc.json b/src/.eslintrc.json
@@ -3,7 +3,12 @@
 
 	"extends": "../.eslintrc-browser.json",
 
-	"globals": {
-		"jQuery": true
-	}
+	"overrides": [
+		{
+			"files": "wrapper.js",
+			"globals": {
+				"jQuery": false
+			}
+		}
+	]
 }
diff --git a/src/core.js b/src/core.js
@@ -27,7 +27,7 @@ define( [
 "use strict";
 
 var
-	version = "3.4.0",
+	version = "3.4.1",
 
 	// Define a local copy of jQuery
 	jQuery = function( selector, context ) {

diff --git a/src/core/isAttached.js b/src/core/isAttached.js
@@ -10,8 +10,12 @@ define( [
 		},
 		composed = { composed: true };
 
+	// Support: IE 9 - 11+, Edge 12 - 18+, iOS 10.0 - 10.2 only
 	// Check attachment across shadow DOM boundaries when possible (gh-3504)
-	if ( documentElement.attachShadow ) {
+	// Support: iOS 10.0-10.2 only
+	// Early iOS 10 versions support `attachShadow` but not `getRootNode`,
+	// leading to errors. We need to check for `getRootNode`.
+	if ( documentElement.getRootNode ) {
 		isAttached = function( elem ) {
 			return jQuery.contains( elem.ownerDocument, elem ) ||
 				elem.getRootNode( composed ) === elem.ownerDocument;

diff --git a/src/css/finalPropName.js b/src/css/finalPropName.js
@@ -1,4 +1,7 @@
-define( [ "../var/document" ], function( document ) {
+define( [
+	"../var/document",
+	"../core"
+], function( document, jQuery ) {
 
 "use strict";