feat: add proper event type

packages/desktop/src/main.js

@@ -0,0 +1,7 @@
+export function main(rootname = "main") {
+  let root = window.document.getElementById(rootname);
+  if (root != null) {
+    window.interpreter = new Interpreter(root);
+    window.ipc.postMessage(serializeIpcMessage("initialize"));
+  }
+}