### Event Listener for Dev Shim

Source: https://github.com/featherframework/feather-menu/blob/main/ui/shim.html

Listens for messages and forwards them to the shim application's iframe. This is used for development purposes to facilitate communication between the main window and the shim.

```javascript
window.addEventListener("message", function (event) {
  let iframe = document.getElementById("shimapp").contentWindow;
  iframe.postMessage(event.data, "*");
});
```

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