feat: add helper process (#2753)

apps/electron/src/helper/main-rpc.ts

@@ -0,0 +1,33 @@
+import { AsyncCall, type EventBasedChannel } from 'async-call-rpc';
+
+import { getExposedMeta } from './exposed';
+
+function createMessagePortMainChannel(
+  connection: Electron.ParentPort
+): EventBasedChannel {
+  return {
+    on(listener) {
+      const f = (e: Electron.MessageEvent) => {
+        listener(e.data);
+      };
+      connection.on('message', f);
+      return () => {
+        connection.off('message', f);
+      };
+    },
+    send(data) {
+      connection.postMessage(data);
+    },
+  };
+}
+
+const helperToMainServer: PeersAPIs.HelperToMain = {
+  getMeta: () => getExposedMeta(),
+};
+
+export const mainRPC = AsyncCall<PeersAPIs.MainToHelper>(helperToMainServer, {
+  strict: {
+    unknownMessage: false,
+  },
+  channel: createMessagePortMainChannel(process.parentPort),
+});