Fix customBurgerIcon and customCrossIcon definitions. They needed to be JSX.Element instead of HTML Element.

Add `State` for `onStateChange` event.

types/react-burger-menu/index.d.ts

@@ -6,13 +6,17 @@
 
 import * as React from "react";
 
+export interface State {
+  isOpen: boolean;
+}
+
 export interface Props {
     burgerBarClassName?: string;
     burgerButtonClassName?: string;
     crossButtonClassName?: string;
     crossClassName?: string;
-    customBurgerIcon?: Element | false;
-    customCrossIcon?: Element | false;
+    customBurgerIcon?: JSX.Element | false;
+    customCrossIcon?: JSX.Element | false;
     id?: string;
     isOpen?: boolean;
     itemListClassName?: string;
@@ -20,7 +24,7 @@ export interface Props {
     morphShapeClassName?: string;
     noOverlay?: boolean;
     disableOverlayClick?: boolean;
-    onStateChange?(): void;
+    onStateChange?(state: State): void;
     // TODO (Rajab) This can be improved, though I do not know how. From PropTypes:
     // styles && styles.outerContainer ? PropTypes.string.isRequired : PropTypes.string
     outerContainerId?: string;

types/react-burger-menu/react-burger-menu-tests.tsx

@@ -1,5 +1,5 @@
 import * as React from 'react';
-import { slide as Menu } from 'react-burger-menu';
+import { slide as Menu, State } from 'react-burger-menu';
 
 class Example extends React.Component {
   showSettings(event: {
@@ -10,7 +10,11 @@ class Example extends React.Component {
 
   render() {
     return (
-      <Menu>
+      <Menu
+        customBurgerIcon={<img src="img/icon.svg" />}
+        customCrossIcon={<img src="img/icon.svg" />}
+        onStateChange={this.onStateChange}
+      >
         <a id="home" className="menu-item" href="/">Home</a>
         <a id="about" className="menu-item" href="/about">About</a>
         <a id="contact" className="menu-item" href="/contact">Contact</a>
@@ -18,4 +22,8 @@ class Example extends React.Component {
       </Menu>
     );
   }
+
+  onStateChange = (state: State): void => {
+    console.log(state.isOpen);
+  }
 }