fix(types,client,server): improve type safety and harden client/server message handling

ts/smartuniverse.classes.client.universechannel.ts

@@ -69,8 +69,12 @@ export class ClientUniverseChannel implements interfaces.IUniverseChannel {
   public async populateSubscriptionToServer() {
     // lets make sure the channel is connected
     if (this.status === 'unsubscribed') {
+      const smartsocketClient = this.clientUniverseRef.smartsocketClient;
+      if (!smartsocketClient) {
+        throw new Error('Cannot subscribe channel before the smartuniverse client is connected.');
+      }
       const response =
-        await this.clientUniverseRef.smartsocketClient.serverCall<interfaces.ISocketRequest_SubscribeChannel>(
+        await smartsocketClient.serverCall<interfaces.ISocketRequest_SubscribeChannel>(
           'subscribeChannel',
           {
             name: this.name,
@@ -91,6 +95,10 @@ export class ClientUniverseChannel implements interfaces.IUniverseChannel {
    */
   public async postMessage(messageArg: interfaces.IMessageCreator) {
     await this.clientUniverseRef.start(); // its ok to call this multiple times
+    const smartsocketClient = this.clientUniverseRef.smartsocketClient;
+    if (!smartsocketClient) {
+      throw new Error('Cannot post message before the smartuniverse client is connected.');
+    }
     const universeMessageToSend: interfaces.IUniverseMessage = {
       id: plugins.isounique.uni(),
       timestamp: Date.now(),
@@ -99,7 +107,7 @@ export class ClientUniverseChannel implements interfaces.IUniverseChannel {
       messageText: messageArg.messageText,
       payload: messageArg.payload,
     };
-    await this.clientUniverseRef.smartsocketClient.serverCall(
+    await smartsocketClient.serverCall<interfaces.ISocketRequest_ProcessMessage>(
       'processMessage',
       universeMessageToSend
     );