fix: use const+type alias so @deprecated survives dts bundling

Author: felixweinberger

packages/middleware/node/src/index.ts

@@ -1,8 +1,10 @@
+import { NodeStreamableHTTPServerTransport } from './streamableHttp.js';
+
 export * from './streamableHttp.js';
 
-// v1-compat re-exports.
-export {
-    /** @deprecated Use {@linkcode NodeStreamableHTTPServerTransport}. */
-    NodeStreamableHTTPServerTransport as StreamableHTTPServerTransport
-} from './streamableHttp.js';
+/** @deprecated Use {@linkcode NodeStreamableHTTPServerTransport}. */
+export const StreamableHTTPServerTransport = NodeStreamableHTTPServerTransport;
+/** @deprecated Use {@linkcode NodeStreamableHTTPServerTransport}. */
+export type StreamableHTTPServerTransport = NodeStreamableHTTPServerTransport;
+
 export type { EventId, EventStore, StreamId } from '@modelcontextprotocol/server';