feat: Support LaTeX and AsciiMath via MathJax on stem.excalidraw.com

src/packages/extensions/example/index.tsx

@@ -0,0 +1,23 @@
+import React from "react";
+import ReactDOM from "react-dom";
+
+import App from "../../excalidraw/example/App";
+
+declare global {
+  interface Window {
+    ExcalidrawExtensionsLib: any;
+  }
+}
+const { useExtensions } = window.ExcalidrawExtensionsLib;
+
+const rootElement = document.getElementById("root");
+ReactDOM.render(
+  <React.StrictMode>
+    <App
+      appTitle={"Excalidraw Extensions Example"}
+      useCustom={useExtensions}
+      customArgs={["mathjax"]}
+    />
+  </React.StrictMode>,
+  rootElement,
+);