remove empty namespace hack

types/test-listen/index.d.ts

@@ -10,6 +10,4 @@ import { Server } from "net";
 
 declare function testListen(srv: Server, hostname?: string): Promise<string>;
 
-declare namespace testListen {}
-
 export = testListen;

types/test-listen/test-listen-tests.ts

@@ -1,5 +1,5 @@
 import * as http from 'http';
-import * as testListen from 'test-listen';
+import testListen = require('test-listen');
 
 const test = async (): Promise<void> => {
     const server = http.createServer((req: http.IncomingMessage, res: http.ServerResponse): void => {