diff --git a/vlib/jsdom/jsdom.js.v b/vlib/jsdom/jsdom.js.v
index 4d9f1825ae..06c2d5483f 100644
--- a/vlib/jsdom/jsdom.js.v
+++ b/vlib/jsdom/jsdom.js.v
@@ -131,8 +131,270 @@ mut:
 	y JS.Number
 }
 
+[use_new]
+pub fn JS.DOMRect.prototype.constructor(x JS.Number, y JS.Number, width JS.Number, height JS.Number) JS.DOMRect
+
 pub interface JS.DOMStringList {
 	length JS.Number
 	contains(JS.String) JS.Boolean
 	item(index JS.Number) ?JS.String
 }
+
+pub interface JS.DOMRectList {
+	length JS.Number
+	contains(JS.String) JS.Boolean
+	item(index JS.Number) ?JS.Rect
+}
+
+pub type DOMTokenListForEachCb = fn (JS.String, JS.Number, JS.DOMTokenList)
+
+pub interface JS.DOMTokenList {
+	length JS.Number
+	toString() JS.String
+	add(tokens ...JS.Any) ?JS.Any
+	contains(token JS.String) JS.Boolean
+	item(index JS.Number) ?JS.String
+	remove(tokens ...JS.Any) ?JS.Any
+	replace(token JS.String, newToken JS.String) JS.Boolean
+	supports(token JS.String) JS.Boolean
+	toggle(token JS.String, force JS.Boolean) JS.Boolean
+	forEach(cb DOMTokenListForEachCb, thisArg JS.Any)
+mut:
+	value JS.String
+}
+
+pub struct JS.EventListenerOptions {
+	capture bool
+}
+
+pub interface JS.EventTarget {
+	addEventListener(cb EventCallback, options JS.EventListenerOptions)
+	dispatchEvent(event JS.Event) JS.Boolean
+	removeEventListener(cb EventCallback, options JS.EventListenerOptions)
+}
+
+// Event is an event which takes place in the DOM.
+pub interface JS.Event {
+	JS.EventTarget
+	bubbles JS.Boolean
+	cancelable JS.Boolean
+	composed JS.Boolean
+	currentTarget JS.EventTarget
+	defaultPrevented JS.Boolean
+	eventPhase JS.Number
+	isTrusted JS.Boolean
+	srcElement JS.EventTarget
+	timeStamp JS.DOMHighResTimeStamp // composedPath returns the invocation target objects of event's path.
+	composedPath() JS.Array
+	initEvent(typ JS.String, bubbles JS.Boolean, cancelable JS.Boolean)
+	preventDefault()
+	stopImmediatePropagation()
+	stopPropagation()
+mut:
+	returnValue JS.Boolean
+}
+
+pub fn event_type(ev JS.Event) string {
+	res := ''
+	#res.str = ev.type;
+
+	return res
+}
+
+pub fn create_event(typ string, bubbles bool, cancelable bool, composed bool) JS.Event {
+	mut ev := JS.Event(voidptr(0))
+	#ev = new Event(typ.str,bubbles.val,cancelable.val,composed.val);
+
+	return ev
+}
+
+pub interface JS.UIEvent {
+	JS.Event
+	detail JS.Number
+	view JS.Any
+}
+
+[use_new]
+pub fn JS.UIEvent.prototype.constructor(typ JS.String, dict JS.UIEventDict) JS.UIEvent
+
+pub struct JS.EventInit {
+	bubbles    JS.Boolean
+	cancelable JS.Boolean
+	composed   JS.Boolean
+}
+
+pub struct JS.UIEventInitDict {
+	bubbles    JS.Boolean
+	cancelable JS.Boolean
+	composed   JS.Boolean
+	detail     JS.Number
+	view       JS.Any
+	which      JS.Number
+}
+
+pub interface JS.MouseEvent {
+	JS.UIEvent
+	altKey JS.Boolean
+	button JS.Number
+	buttons JS.Number
+	clientX JS.Number
+	clientY JS.Number
+	ctrlKey JS.Number
+	metaKey JS.Number
+	movementX JS.Number
+	movementY JS.Number
+	offsetX JS.Number
+	offsetY JS.Number
+	pageX JS.Number
+	pageY JS.Number
+	relatedTarget JS.Any
+	screenX JS.Number
+	screenY JS.Number
+	shiftKey JS.Boolean
+	x JS.Number
+	y JS.Number
+	getModifierState(keyArg JS.String) JS.Boolean
+}
+
+pub interface JS.Node {
+	JS.EventTarget
+	baseURI JS.String
+	childNodes JS.Any
+	firstChild JS.ChildNode
+	isConnected JS.Boolean
+	lastChild JS.ChildNode
+	nextSibling JS.ChildNode
+	nodeName JS.String
+	nodeType JS.Number
+	ownerDocument JS.Document
+	parentElement JS.HTMLElement
+	parentNode JS.ParentNode
+	previousSibling JS.ChildNode
+	appendChild(node JS.Node) JS.Node
+	cloneNode(deep JS.Boolean) JS.Node
+	compareDocumentPosition(other JS.Node) JS.Number
+	contains(other JS.Node) JS.Boolean
+	getRootNode(composed JS.Boolean) JS.Node
+	hasChildNodes() JS.Boolean
+	insertBefore(node JS.Node, child JS.Node) JS.Node
+	isEqualNode(otherNode JS.Node) JS.Boolean
+	isSameNode(otherNode JS.Node) JS.Boolean
+	lookupPrefix(namespace JS.String) JS.String
+	normalize()
+	removeChild(child JS.Node) JS.Node
+	replaceChild(node JS.Node, child JS.Node) JS.Npde
+mut:
+	nodeValue JS.String
+	textContent JS.String
+}
+
+pub interface JS.ChildNode {
+	JS.Node
+	after(nodes ...JS.Any)
+	before(nodes ...JS.Any)
+	remove()
+	replaceWith(nodes ...JS.Any)
+}
+
+pub interface JS.ParentNode {
+	JS.Node
+	childElementCount JS.Number
+	children JS.HTMLCollection
+}
+
+pub interface JS.Document {
+	JS.Node
+	all JS.HTMLAllCollection
+	anchros JS.HTMLCollection
+	applets JS.HTMLCollection
+	characterSet JS.String
+	charset JS.String
+	compatMode JS.String
+	contentType JS.String
+	documentURI JS.String
+	documentElement JS.HTMLElement
+	hidden JS.Boolean
+	head JS.HTMLHeadElement
+	fullscreenEnabled JS.Boolean
+	fullscreen JS.Boolean
+	lastModified JS.String
+	inputEncoding JS.String
+	implementation JS.DOMImplementation
+mut:
+	bgColor JS.String
+	body JS.HTMLElement
+	cookie JS.String
+	domain JS.String
+}
+
+pub interface JS.PointerEvent {
+	JS.MouseEvent
+	height JS.Number
+	isPrimary JS.Boolean
+	pointerId JS.Number
+	pointerType JS.String
+	pressure JS.Number
+	tangentialPressure JS.Number
+	tiltX JS.Number
+	tiltY JS.Number
+	twist JS.Number
+	width JS.Number
+	getCoalescedEvents() JS.Array
+	getPredictedEvents() JS.Array
+}
+
+pub interface JS.Element {
+	JS.Node
+	classList JS.DOMTokenList
+	clientHeight JS.Number
+	clientLeft JS.Number
+	clientTop JS.Number
+	clientWidth JS.Number
+	localName JS.String
+	namespaceURI JS.String
+	ownerDocument JS.Document
+	part JS.DOMTokenList
+	prefix JS.String
+	scrollHeight JS.Number
+	scrollWidth JS.Number
+	tagName JS.String
+	closest(selector JS.String) ?JS.Element
+	getAttribute(qualifiedName JS.String) ?JS.String
+	getAttributeNS(namespace JS.String, localName JS.String) ?JS.String
+	getAttributeNames() JS.Array
+	getClientRects() JS.DOMRectList
+	getBoundingClientRect() JS.DOMRect
+	scrollTo(x JS.Number, y JS.Number)
+	scroll(x JS.Number, y JS.Number)
+	scrollBy(x JS.Number, y JS.Number)
+	toggleAttribute(qualifiedName JS.String, force JS.Boolean) JS.Boolean
+mut:
+	className JS.String
+	id JS.String
+	onfullscreenchange fn (this JS.Element, ev JS.Event) JS.Any
+	onfullscreenerror fn (this JS.Element, ev JS.Event) JS.Any
+	outerHTML JS.String
+	scrollLeft JS.Number
+	scrollTop JS.Number
+	slot JS.String
+}
+
+pub const (
+	document = JS.Document{}
+)
+
+fn init() {
+	#jsdom__document = document;
+}
+
+pub type EventCallback = fn (JS.Event)
+
+// event_listener returns proper listener callback. This function is useful when you need access to `this` value
+// that is EventTarget. When you need access only to Event itself you can just use `fn (JS.Event)` as listener.
+pub fn event_listener(callback fn (JS.EventTarget, JS.Event)) EventCallback {
+	return fn [callback] (event JS.Event) {
+		mut target := JS.EventTarget(voidptr(0))
+		#target = this;
+		callback(target, event)
+	}
+}
diff --git a/vlib/v/checker/checker.v b/vlib/v/checker/checker.v
index 27521b4dbd..947ca95640 100644
--- a/vlib/v/checker/checker.v
+++ b/vlib/v/checker/checker.v
@@ -567,8 +567,9 @@ pub fn (mut c Checker) interface_decl(mut node ast.InterfaceDecl) {
 				c.ensure_type_exists(param.typ, param.pos) or { return }
 				if is_js {
 					ptyp := c.table.get_type_symbol(param.typ)
-					if ptyp.kind != .function && ptyp.language != .js
-						&& !ptyp.name.starts_with('JS.') {
+					if (ptyp.kind != .function && ptyp.language != .js
+						&& !ptyp.name.starts_with('JS.')) && !(j == method.params.len - 1
+						&& method.is_variadic) {
 						c.error('method `$method.name` accepts non JS type as parameter',
 							method.pos)
 					}
@@ -594,7 +595,7 @@ pub fn (mut c Checker) interface_decl(mut node ast.InterfaceDecl) {
 			c.ensure_type_exists(field.typ, field.pos) or { return }
 			if is_js {
 				tsym := c.table.get_type_symbol(field.typ)
-				if tsym.language != .js && !tsym.name.starts_with('JS.') {
+				if tsym.language != .js && !tsym.name.starts_with('JS.') && tsym.kind != .function {
 					c.error('field `$field.name` uses non JS type', field.pos)
 				}
 			}
@@ -3153,8 +3154,8 @@ fn (mut c Checker) type_implements(typ ast.Type, interface_type ast.Type, pos to
 		// `none` "implements" the Error interface
 		return true
 	}
-	if typ_sym.kind == .interface_ && inter_sym.kind == .interface_ && styp != 'JS.Any'
-		&& inter_sym.name != 'JS.Any' {
+	if typ_sym.kind == .interface_ && inter_sym.kind == .interface_ && !styp.starts_with('JS.')
+		&& !inter_sym.name.starts_with('JS.') {
 		c.error('cannot implement interface `$inter_sym.name` with a different interface `$styp`',
 			pos)
 	}
diff --git a/vlib/v/gen/js/fn.v b/vlib/v/gen/js/fn.v
index 264450305a..5a8996ab60 100644
--- a/vlib/v/gen/js/fn.v
+++ b/vlib/v/gen/js/fn.v
@@ -85,7 +85,7 @@ fn (mut g JsGen) js_call(node ast.CallExpr) {
 	g.write(')')
 	if call_return_is_optional {
 		g.write(';\n')
-		g.writeln('if (tmp === null || tmp === undefined) throw "none";')
+		g.writeln('if (tmp === null) throw "none";')
 		g.writeln('return tmp;')
 		g.writeln('} catch(err) {')
 		g.inc_indent()
@@ -140,7 +140,7 @@ fn (mut g JsGen) js_method_call(node ast.CallExpr) {
 	g.write(')')
 	if call_return_is_optional {
 		g.write(';\n')
-		g.writeln('if (tmp === null || tmp === undefined) throw "none";')
+		g.writeln('if (tmp === null) throw "none";')
 		g.writeln('return tmp;')
 		g.writeln('} catch(err) {')
 		g.inc_indent()
diff --git a/vlib/v/gen/js/js.v b/vlib/v/gen/js/js.v
index 4574da2059..ecb19f200d 100644
--- a/vlib/v/gen/js/js.v
+++ b/vlib/v/gen/js/js.v
@@ -3091,9 +3091,12 @@ fn (mut g JsGen) gen_selector_expr(it ast.SelectorExpr) {
 	}
 	g.expr(it.expr)
 	mut ltyp := it.expr_type
-	for ltyp.is_ptr() {
-		g.write('.val')
-		ltyp = ltyp.deref()
+	lsym := g.table.get_type_symbol(ltyp)
+	if lsym.kind != .interface_ && lsym.language != .js {
+		for ltyp.is_ptr() {
+			g.write('.val')
+			ltyp = ltyp.deref()
+		}
 	}
 	g.write('.$it.field_name')
 }
@@ -3159,7 +3162,11 @@ fn (mut g JsGen) gen_struct_init(it ast.StructInit) {
 	type_sym := g.table.get_type_symbol(it.typ)
 	name := type_sym.name
 	if it.fields.len == 0 && type_sym.kind != .interface_ {
-		g.write('new ${g.js_name(name)}({})')
+		if type_sym.kind == .struct_ && type_sym.language == .js {
+			g.write('{}')
+		} else {
+			g.write('new ${g.js_name(name)}({})')
+		}
 	} else if it.fields.len == 0 && type_sym.kind == .interface_ {
 		g.write('new ${g.js_name(name)}()') // JS interfaces can be instantiated with default ctor
 	} else if type_sym.kind == .interface_ && it.fields.len != 0 {
@@ -3176,7 +3183,11 @@ fn (mut g JsGen) gen_struct_init(it ast.StructInit) {
 		g.dec_indent()
 		g.writeln('})()')
 	} else {
-		g.writeln('new ${g.js_name(name)}({')
+		if type_sym.kind == .struct_ && type_sym.language == .js {
+			g.writeln('{')
+		} else {
+			g.writeln('new ${g.js_name(name)}({')
+		}
 		g.inc_indent()
 		for i, field in it.fields {
 			g.write('$field.name: ')
@@ -3187,7 +3198,11 @@ fn (mut g JsGen) gen_struct_init(it ast.StructInit) {
 			g.writeln('')
 		}
 		g.dec_indent()
-		g.write('})')
+		if type_sym.kind == .struct_ && type_sym.language == .js {
+			g.writeln('}')
+		} else {
+			g.writeln('})')
+		}
 	}
 }