test(compat): import OAuth subclasses from public surface; add StreamableHTTPError instanceof+status assertion; drop redundant cast

Author: felixweinberger

packages/client/test/client/streamableHttp.test.ts

@@ -1872,7 +1872,9 @@ describe('StreamableHTTPClientTransport', () => {
 
             const error = await transport.send(message).catch(e => e);
             expect(error).toBeInstanceOf(SdkError);
+            expect(error).toBeInstanceOf(StreamableHTTPError);
             expect((error as SdkError).code).toBe(SdkErrorCode.ClientHttpAuthentication);
+            expect((error as StreamableHTTPError).status).toBe(401);
             expect(mockAuthProvider.saveTokens).toHaveBeenCalledWith({
                 access_token: 'new-access-token',
                 token_type: 'Bearer',

packages/core/src/errors/oauthErrorsCompat.ts

@@ -17,7 +17,7 @@ type OAuthErrorSubclass = {
 
 function sub(code: OAuthErrorCode, name: string): OAuthErrorSubclass {
     const Sub = class extends OAuthError {
-        static errorCode = code as string;
+        static errorCode = code;
         constructor(message: string, errorUri?: string) {
             super(code, message, errorUri);
             this.name = name;

packages/core/test/errors/compat.test.ts

@@ -1,5 +1,6 @@
 import { describe, expect, it, vi } from 'vitest';
 import {
+    CustomOAuthError,
     ErrorCode,
     InvalidTokenError,
     McpError,
@@ -9,9 +10,9 @@ import {
     ProtocolErrorCode,
     SdkError,
     SdkErrorCode,
+    ServerError,
     StreamableHTTPError
 } from '../../src/exports/public/index.js';
-import { CustomOAuthError, ServerError } from '../../src/errors/oauthErrorsCompat.js';
 
 describe('v1-compat error aliases', () => {
     it('McpError / ErrorCode alias ProtocolError / ProtocolErrorCode (+ ConnectionClosed/RequestTimeout from SdkErrorCode)', () => {