chore: switch to module ESNext + moduleResolution bundler (#2095)

test/e2e/scenarios/client-auth.test.ts

@@ -43,9 +43,9 @@ import { importSPKI, jwtVerify } from 'jose';
 import { expect, vi } from 'vitest';
 import { z } from 'zod/v4';
 
-import { hostPerSession } from '../helpers/index.js';
-import { verifies } from '../helpers/verifies.js';
-import type { TestArgs } from '../types.js';
+import { hostPerSession } from '../helpers/index';
+import { verifies } from '../helpers/verifies';
+import type { TestArgs } from '../types';
 
 const ISSUER = 'https://auth.example.com';
 const MCP_URL = 'http://in-process/mcp';

test/e2e/scenarios/completion.test.ts

@@ -12,9 +12,9 @@ import { completable, McpServer, ProtocolError, ProtocolErrorCode, ResourceTempl
 import { expect } from 'vitest';
 import { z } from 'zod/v4';
 
-import { wire } from '../helpers/index.js';
-import { verifies } from '../helpers/verifies.js';
-import type { TestArgs } from '../types.js';
+import { wire } from '../helpers/index';
+import { verifies } from '../helpers/verifies';
+import type { TestArgs } from '../types';
 
 const COLORS = ['red', 'green', 'blue', 'rebeccapurple'] as const;
 const FILE_PATHS = ['README.md', 'src/index.ts', 'src/types.ts'] as const;

test/e2e/scenarios/custom-methods.test.ts

@@ -15,9 +15,9 @@ import { McpServer, ProtocolErrorCode, Server } from '@modelcontextprotocol/serv
 import { expect, vi } from 'vitest';
 import { z } from 'zod/v4';
 
-import { wire } from '../helpers/index.js';
-import { verifies } from '../helpers/verifies.js';
-import type { TestArgs } from '../types.js';
+import { wire } from '../helpers/index';
+import { verifies } from '../helpers/verifies';
+import type { TestArgs } from '../types';
 
 verifies('custom-methods:server-handler:roundtrip', async ({ transport }: TestArgs) => {
     const SearchParams = z.object({ query: z.string(), limit: z.number().int().default(5) });

test/e2e/scenarios/dynamic.test.ts

@@ -12,9 +12,9 @@ import { McpServer, ProtocolErrorCode, Server } from '@modelcontextprotocol/serv
 import { expect, vi } from 'vitest';
 import { z } from 'zod/v4';
 
-import { wire } from '../helpers/index.js';
-import { verifies } from '../helpers/verifies.js';
-import type { TestArgs } from '../types.js';
+import { wire } from '../helpers/index';
+import { verifies } from '../helpers/verifies';
+import type { TestArgs } from '../types';
 
 const newClient = () => new Client({ name: 'c', version: '0' });
 

test/e2e/scenarios/elicitation.test.ts

@@ -22,9 +22,9 @@ import {
 import { expect } from 'vitest';
 import { z } from 'zod/v4';
 
-import { tapWire, wire } from '../helpers/index.js';
-import { verifies } from '../helpers/verifies.js';
-import type { TestArgs } from '../types.js';
+import { tapWire, wire } from '../helpers/index';
+import { verifies } from '../helpers/verifies';
+import type { TestArgs } from '../types';
 
 /** Client with form-mode elicitation support. */
 const formClient = () => new Client({ name: 'c', version: '0' }, { capabilities: { elicitation: { form: {} } } });

test/e2e/scenarios/errors.test.ts

@@ -24,9 +24,9 @@ import {
 import { expect } from 'vitest';
 import { z } from 'zod/v4';
 
-import { hostPerSession, tapWire, wire } from '../helpers/index.js';
-import { verifies } from '../helpers/verifies.js';
-import type { TestArgs } from '../types.js';
+import { hostPerSession, tapWire, wire } from '../helpers/index';
+import { verifies } from '../helpers/verifies';
+import type { TestArgs } from '../types';
 
 const newClient = () => new Client({ name: 'c', version: '0' });
 

test/e2e/scenarios/flow.test.ts

@@ -24,10 +24,10 @@ import { McpServer, ProtocolErrorCode, Server, specTypeSchemas, UrlElicitationRe
 import { expect, vi } from 'vitest';
 import { z } from 'zod/v4';
 
-import { hostPerSession, hostResumable, wire } from '../helpers/index.js';
-import { startLegacySseHost } from '../helpers/sse-host.js';
-import { verifies } from '../helpers/verifies.js';
-import type { TestArgs } from '../types.js';
+import { hostPerSession, hostResumable, wire } from '../helpers/index';
+import { startLegacySseHost } from '../helpers/sse-host';
+import { verifies } from '../helpers/verifies';
+import type { TestArgs } from '../types';
 
 verifies('flow:compat:dual-transport-server', async (_args: TestArgs) => {
     // One deployment, one server factory, both transports: the modern Streamable HTTP

test/e2e/scenarios/handler-context.test.ts

@@ -15,9 +15,9 @@ import { McpServer } from '@modelcontextprotocol/server';
 import { expect, vi } from 'vitest';
 import { z } from 'zod/v4';
 
-import { hostPerSession, wire } from '../helpers/index.js';
-import { verifies } from '../helpers/verifies.js';
-import type { TestArgs } from '../types.js';
+import { hostPerSession, wire } from '../helpers/index';
+import { verifies } from '../helpers/verifies';
+import type { TestArgs } from '../types';
 
 verifies('mcpserver:context:log-from-handler', async ({ transport }: TestArgs) => {
     let releaseHandler!: () => void;

test/e2e/scenarios/hosting-auth.test.ts

@@ -31,8 +31,8 @@ import { McpServer, WebStandardStreamableHTTPServerTransport } from '@modelconte
 import { expect } from 'vitest';
 import { z } from 'zod/v4';
 
-import { verifies } from '../helpers/verifies.js';
-import type { TestArgs } from '../types.js';
+import { verifies } from '../helpers/verifies';
+import type { TestArgs } from '../types';
 
 const VALID_TOKEN = 'analytics-dashboard-access-token';
 

test/e2e/scenarios/hosting-express.test.ts

@@ -30,9 +30,9 @@ import express from 'express';
 import { expect } from 'vitest';
 import { z } from 'zod/v4';
 
-import { startExpressMinimal, startExpressWithHostValidation } from '../helpers/express.js';
-import { verifies } from '../helpers/verifies.js';
-import type { TestArgs } from '../types.js';
+import { startExpressMinimal, startExpressWithHostValidation } from '../helpers/express';
+import { verifies } from '../helpers/verifies';
+import type { TestArgs } from '../types';
 
 const RESOURCE_METADATA_URL = 'https://mcp.example.com/.well-known/oauth-protected-resource';
 const VALID_TOKEN = 'analytics-dashboard-token';

test/e2e/scenarios/hosting-fastify.test.ts

@@ -19,8 +19,8 @@ import type { FastifyInstance, FastifyRequest } from 'fastify';
 import { expect } from 'vitest';
 import { z } from 'zod/v4';
 
-import { verifies } from '../helpers/verifies.js';
-import type { TestArgs } from '../types.js';
+import { verifies } from '../helpers/verifies';
+import type { TestArgs } from '../types';
 
 function forecastServer(): McpServer {
     const s = new McpServer({ name: 'forecast-server', version: '0.3.0' });

test/e2e/scenarios/hosting-hono.test.ts

@@ -20,8 +20,8 @@ import type { Hono } from 'hono';
 import { expect } from 'vitest';
 import { z } from 'zod/v4';
 
-import { verifies } from '../helpers/verifies.js';
-import type { TestArgs } from '../types.js';
+import { verifies } from '../helpers/verifies';
+import type { TestArgs } from '../types';
 
 function recipeServer(): McpServer {
     const s = new McpServer({ name: 'recipe-server', version: '1.2.0' });

test/e2e/scenarios/hosting-http.test.ts

@@ -18,10 +18,10 @@ import { LATEST_PROTOCOL_VERSION, McpServer, WebStandardStreamableHTTPServerTran
 import { expect, vi } from 'vitest';
 import { z } from 'zod/v4';
 
-import type { HttpHandler } from '../helpers/index.js';
-import { hostPerSession, hostStateless } from '../helpers/index.js';
-import { verifies } from '../helpers/verifies.js';
-import type { TestArgs } from '../types.js';
+import type { HttpHandler } from '../helpers/index';
+import { hostPerSession, hostStateless } from '../helpers/index';
+import { verifies } from '../helpers/verifies';
+import type { TestArgs } from '../types';
 
 function echoServer(): McpServer {
     const s = new McpServer({ name: 's', version: '0' });

test/e2e/scenarios/hosting-resume.test.ts

@@ -12,9 +12,9 @@ import { LATEST_PROTOCOL_VERSION, McpServer, parseJSONRPCMessage } from '@modelc
 import { expect, vi } from 'vitest';
 import { z } from 'zod/v4';
 
-import { hostResumable } from '../helpers/index.js';
-import { verifies } from '../helpers/verifies.js';
-import type { TestArgs } from '../types.js';
+import { hostResumable } from '../helpers/index';
+import { verifies } from '../helpers/verifies';
+import type { TestArgs } from '../types';
 
 /**
  * These three tests assert the raw frame sequence of the POST SSE stream itself, so they cannot run their traffic through a connected client.

test/e2e/scenarios/hosting-session.test.ts

@@ -19,10 +19,10 @@ import express from 'express';
 import { expect, vi } from 'vitest';
 import { z } from 'zod/v4';
 
-import { startExpressMinimal } from '../helpers/express.js';
-import { hostPerSession, hostStateless, wire } from '../helpers/index.js';
-import { verifies } from '../helpers/verifies.js';
-import type { TestArgs } from '../types.js';
+import { startExpressMinimal } from '../helpers/express';
+import { hostPerSession, hostStateless, wire } from '../helpers/index';
+import { verifies } from '../helpers/verifies';
+import type { TestArgs } from '../types';
 
 const newClient = () => new Client({ name: 'c', version: '0' });
 

test/e2e/scenarios/lifecycle.test.ts

@@ -32,9 +32,9 @@ import {
 import { expect } from 'vitest';
 import { z } from 'zod/v4';
 
-import { tapWire, wire } from '../helpers/index.js';
-import { verifies } from '../helpers/verifies.js';
-import type { TestArgs } from '../types.js';
+import { tapWire, wire } from '../helpers/index';
+import { verifies } from '../helpers/verifies';
+import type { TestArgs } from '../types';
 
 function olderSupportedVersion(): string {
     const older = SUPPORTED_PROTOCOL_VERSIONS.find(v => v !== LATEST_PROTOCOL_VERSION);

test/e2e/scenarios/logging.test.ts

@@ -17,9 +17,9 @@ import { isJSONRPCRequest, McpServer, ProtocolError, ProtocolErrorCode, Server,
 import { expect, vi } from 'vitest';
 import { z } from 'zod/v4';
 
-import { tapWire, wire } from '../helpers/index.js';
-import { verifies } from '../helpers/verifies.js';
-import type { TestArgs } from '../types.js';
+import { tapWire, wire } from '../helpers/index';
+import { verifies } from '../helpers/verifies';
+import type { TestArgs } from '../types';
 
 const ALL_LEVELS: LoggingLevel[] = ['debug', 'info', 'notice', 'warning', 'error', 'critical', 'alert', 'emergency'];
 

test/e2e/scenarios/pagination.test.ts

@@ -10,9 +10,9 @@ import { isJSONRPCRequest, McpServer, ProtocolError, ProtocolErrorCode, Resource
 import { expect } from 'vitest';
 import { z } from 'zod/v4';
 
-import { tapWire, wire } from '../helpers/index.js';
-import { verifies } from '../helpers/verifies.js';
-import type { TestArgs } from '../types.js';
+import { tapWire, wire } from '../helpers/index';
+import { verifies } from '../helpers/verifies';
+import type { TestArgs } from '../types';
 
 const newClient = () => new Client({ name: 'c', version: '0' });
 

test/e2e/scenarios/prompts.test.ts

@@ -14,9 +14,9 @@ import { McpServer, ProtocolError, ProtocolErrorCode, Server } from '@modelconte
 import { expect, vi } from 'vitest';
 import { z } from 'zod/v4';
 
-import { wire } from '../helpers/index.js';
-import { verifies } from '../helpers/verifies.js';
-import type { TestArgs } from '../types.js';
+import { wire } from '../helpers/index';
+import { verifies } from '../helpers/verifies';
+import type { TestArgs } from '../types';
 
 const TINY_PNG_BASE64 = 'iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=';
 const TINY_WAV_BASE64 = 'UklGRiQAAABXQVZFZm10IBAAAAABAAEAQB8AAEAfAAABAAgAZGF0YQAAAAA=';

test/e2e/scenarios/protocol.test.ts

@@ -34,9 +34,9 @@ import {
 import { expect, vi } from 'vitest';
 import { z } from 'zod/v4';
 
-import { tapWire, wire } from '../helpers/index.js';
-import { verifies } from '../helpers/verifies.js';
-import type { TestArgs } from '../types.js';
+import { tapWire, wire } from '../helpers/index';
+import { verifies } from '../helpers/verifies';
+import type { TestArgs } from '../types';
 
 const newClient = () => new Client({ name: 'c', version: '0' });