Update code to allow struct with one generic parameter

templates/typescript_client.rs.ts

@@ -18,17 +18,17 @@ export interface @s.name @{
 export class MRPCConnector @{
     url: string;
 
+    private __create_msg(service: string, method: string, data: any) @{
+        return @{service, method, data@};
+    @}
+
     public constructor(url: string) @{
         this.url = url;
     @}
 
 @for s in &rpc.services { @for m in &s.methods {
     public @(s.name)_@(m.name)(@method_args(m))@method_ret(m) @{
-        const __msg = @{
-            service: '@s.name',
-            method: '@m.name',
-            data: @{@m.args.iter().map(|a| &a.name).join(",")@}
-        @};
+        const __msg = this.__create_msg('@s.name', '@m.name', @{@m.args.iter().map(|a| &a.name).join(",")@});
         @if m.ret.is_some() && !m.ret_stream {return fetch(this.url, @{
             method: 'POST',
             body: JSON.stringify(__msg)