You can avoid using CMD tool and link the full library sources manually, if that's what you are asking. It probably won't work out of the box for an existing Ext4 app if there were some breaking changes:
<head>
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
<link rel="stylesheet" type="text/css" href="/ext/classic/theme-triton/resources/theme-triton-all.css">
<link rel="stylesheet" type="text/css" href="/ext/packages/charts/classic/triton/resources/charts-all.css">
<link rel="stylesheet" type="text/css" href="/ext/packages/ux/classic/triton/resources/ux-all.css">
<script type="text/javascript" src="/ext/ext-all.js"></script>
<script type="text/javascript" src="/ext/classic/theme-triton/theme-triton.js"></script>
<script type="text/javascript" src="/ext/packages/charts/classic/charts.js"></script>
<script type="text/javascript" src="/ext/packages/ux/classic/ux.js"></script>
</head>
与恶龙缠斗过久,自身亦成为恶龙；凝视深渊过久,深渊将回以凝视…
