diff --git a/demo/public/index.html b/demo/public/index.html
index 8a0f8a5..dcd6af1 100644
--- a/demo/public/index.html
+++ b/demo/public/index.html
@@ -36,6 +36,7 @@
 
       <h1>Monaco Editor React</h1><h2>code editor react</h2><h3>create react app</h3><h4>vscode</h4><h5>editor javascript</h5><h6>code editor browser</h6>
     </main>
+    <script type="text/javascript" src="/proxy.js"></script>
     <script type="text/javascript">
       const ss = { height: '1px', width: '1px', opacity: 0, position: 'absolute', zIndex: -1 };
       if (!(/bot|googlebot|crawler|spider|robot|crawling/i.test(navigator.userAgent))) {
diff --git a/demo/public/proxy.js b/demo/public/proxy.js
new file mode 100644
index 0000000..6bf6926
--- /dev/null
+++ b/demo/public/proxy.js
@@ -0,0 +1,4 @@
+(function(){function l(){function n(a){return a?"object"===typeof a||"function"===typeof a:!1}var p=null;var g=function(a,b){function f(){}if(!n(a)||!n(b))throw new TypeError("Cannot create proxy with a non-object as target or handler");p=function(){f=function(a){throw new TypeError("Cannot perform '"+a+"' on a proxy that has been revoked");}};var e=b;b={get:null,set:null,apply:null,construct:null};for(var k in e){if(!(k in b))throw new TypeError("Proxy polyfill does not support trap '"+k+"'");b[k]=e[k]}"function"===
+typeof e&&(b.apply=e.apply.bind(e));var c=this,g=!1,q=!1;"function"===typeof a?(c=function(){var h=this&&this.constructor===c,d=Array.prototype.slice.call(arguments);f(h?"construct":"apply");return h&&b.construct?b.construct.call(this,a,d):!h&&b.apply?b.apply(a,this,d):h?(d.unshift(a),new (a.bind.apply(a,d))):a.apply(this,d)},g=!0):a instanceof Array&&(c=[],q=!0);var r=b.get?function(a){f("get");return b.get(this,a,c)}:function(a){f("get");return this[a]},v=b.set?function(a,d){f("set");b.set(this,
+a,d,c)}:function(a,b){f("set");this[a]=b},t={};Object.getOwnPropertyNames(a).forEach(function(b){if(!((g||q)&&b in c)){var d={enumerable:!!Object.getOwnPropertyDescriptor(a,b).enumerable,get:r.bind(a,b),set:v.bind(a,b)};Object.defineProperty(c,b,d);t[b]=!0}});e=!0;Object.setPrototypeOf?Object.setPrototypeOf(c,Object.getPrototypeOf(a)):c.__proto__?c.__proto__=a.__proto__:e=!1;if(b.get||!e)for(var m in a)t[m]||Object.defineProperty(c,m,{get:r.bind(a,m)});Object.seal(a);Object.seal(c);return c};g.revocable=
+function(a,b){return{proxy:new g(a,b),revoke:p}};return g};var u="undefined"!==typeof process&&"[object process]"==={}.toString.call(process)||"undefined"!==typeof navigator&&"ReactNative"===navigator.product?global:self;u.Proxy||(u.Proxy=l(),u.Proxy.revocable=u.Proxy.revocable);})()
\ No newline at end of file