feat(compat): add StreamableHTTPServerTransport alias and EventStore type re-exports to @modelcontextprotocol/node

v1 code imports `StreamableHTTPServerTransport`, `EventStore`, `EventId`, and `StreamId` from `@modelcontextprotocol/sdk/server/streamableHttp.js`. Re-export them from `@modelcontextprotocol/node` (alias is `@deprecated`, types pass through from `@modelcontextprotocol/server`) so the migration is a package-name swap.

Author: felixweinberger

.changeset/node-transport-v1-aliases.md

@@ -0,0 +1,5 @@
+---
+'@modelcontextprotocol/node': patch
+---
+
+Add v1-compat re-exports: `StreamableHTTPServerTransport` (alias for `NodeStreamableHTTPServerTransport`) and the `EventStore` / `EventId` / `StreamId` types, so v1 imports from `@modelcontextprotocol/sdk/server/streamableHttp.js` map cleanly onto `@modelcontextprotocol/node`.

packages/middleware/node/src/index.ts

@@ -1 +1,8 @@
 export * from './streamableHttp.js';
+
+// v1-compat re-exports.
+export {
+    /** v1 name. The v2-preferred name is {@linkcode NodeStreamableHTTPServerTransport}. */
+    NodeStreamableHTTPServerTransport as StreamableHTTPServerTransport
+} from './streamableHttp.js';
+export type { EventId, EventStore, StreamId } from '@modelcontextprotocol/server';

packages/middleware/node/test/compat.test.ts

@@ -0,0 +1,19 @@
+import { describe, expect, expectTypeOf, it } from 'vitest';
+
+import { NodeStreamableHTTPServerTransport, StreamableHTTPServerTransport } from '../src/index.js';
+import type { EventId, EventStore, StreamId } from '../src/index.js';
+
+describe('v1 compat exports from @modelcontextprotocol/node', () => {
+    it('StreamableHTTPServerTransport aliases NodeStreamableHTTPServerTransport', () => {
+        expect(StreamableHTTPServerTransport).toBe(NodeStreamableHTTPServerTransport);
+        expectTypeOf<StreamableHTTPServerTransport>().toEqualTypeOf<NodeStreamableHTTPServerTransport>();
+    });
+
+    it('re-exports EventStore / EventId / StreamId types', () => {
+        // Type-level assertions: these compile only if the types are exported.
+        expectTypeOf<EventId>().toBeString();
+        expectTypeOf<StreamId>().toBeString();
+        expectTypeOf<EventStore>().toHaveProperty('storeEvent');
+        expectTypeOf<EventStore>().toHaveProperty('replayEventsAfter');
+    });
+});