Adding strong checks on messages exchanged using generic-type-guard

front/src/Api/Events/IframeEvent.ts

@@ -0,0 +1,7 @@
+interface IframeEvent {
+    type: string;
+    data: unknown;
+}
+
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+export const isIframeEventWrapper = (event: any): event is IframeEvent => typeof event.type === 'string' && typeof event.data === 'object';