add js class

docs/spec.md

@@ -1,7 +1,7 @@
 # Specification: NATSBridge
 
-**Version**: 1.0.0  
-**Date**: 2026-03-13  
+**Version**: 1.1.0  
+**Date**: 2026-03-15  
 **Status**: Active  
 **Ground Truth**: [`src/NATSBridge.jl`](../src/NATSBridge.jl)  
 **Specification Format**: JSON Schema + AsyncAPI
@@ -481,11 +481,38 @@ async function smartsend(
         reply_to?: string;
         reply_to_msg_id?: string;
         is_publish?: boolean;
-        nats_connection?: NATS.Connection;
+        nats_connection?: NATSClient | NATS.Connection;
         msg_id?: string;
         sender_id?: string;
     }
 ): Promise<[Object, string]>;
+
+// NATSClient class for connection management
+class NATSClient {
+    constructor(url: string, keepAlive?: boolean);
+    connect(): Promise<NATS.Connection>;
+    publish(subject: string, message: string, correlationId: string): Promise<void>;
+    close(): Promise<void>;
+    getConnection(): NATS.Connection | null;
+    isConnected(): boolean;
+}
+
+// NATSConnectionPool for managing multiple connections
+class NATSConnectionPool {
+    constructor(url: string, maxSize?: number);
+    acquire(): Promise<NATSClient>;
+    release(client: NATSClient): void;
+    closeAll(): Promise<void>;
+}
+
+// publishMessage function for manual publishing
+async function publishMessage(
+    brokerUrlOrClient: string | NATSClient | NATS.Connection,
+    subject: string,
+    message: string,
+    correlationId: string,
+    closeConnection?: boolean
+): Promise<void>;
 ```
 
 #### MicroPython
@@ -805,8 +832,10 @@ flowchart TD
 | Julia | Arrow.jl | Latest | Arrow IPC support |
 | Julia | HTTP.jl | Latest | HTTP file server |
 | Julia | UUIDs.jl | Latest | UUID generation |
-| Node.js | nats | Latest | NATS client |
+| Node.js | nats | Latest | NATS client (TCP) |
 | Node.js | node-fetch | Latest | HTTP file server |
+| Browser | nats.ws | Latest | NATS client (WebSocket) |
+| Browser | nats | Latest | NATS client (for bundling) |
 | Python | nats-py | Latest | NATS client |
 | Python | aiohttp | Latest | HTTP file server |
 | Python | pyarrow | Latest | Arrow IPC support |
@@ -825,6 +854,11 @@ flowchart TD
 
 | Date | Version | Changes |
 |------|---------|---------|
+| 2026-03-15 | 1.1.0 | Browser connection management |
+| - | - | Added NATSClient class with keepAlive support |
+| - | - | Added NATSConnectionPool for connection reuse |
+| - | - | Added publishMessage function with closeConnection option |
+| - | - | Added nats.ws to browser dependencies |
 | 2026-03-13 | 1.0.0 | Initial specification |
 | - | - | Message envelope schema defined |
 | - | - | Payload schema with transport modes |