fix

test/test.ts

@@ -0,0 +1,19 @@
+import { RPCSocketServer } from '../src/backend/RPCSocketServer'
+//@ts-ignore
+import {RPCaller} from '../src/frontend/RPCaller'
+
+new RPCSocketServer(20000, [{
+    name: "HelloWorldRPCGroup",
+    exportRPCs: () => [{
+        type: 'call',
+        name: 'echo',
+        func: async (s:string) => s,
+        visibility: 'private'
+    }]
+}] )
+
+const caller = new RPCaller(20000, 'localhost')
+caller.connect().then(_ => {
+    caller.info().then(console.log)
+    caller["HelloWorldRPCGroup"].echo("x").then(console.log)
+})