Stop casting to net.AddressInfo type as that should already be inferred.

This is necessary after the changes in 0f75909
and #2344, as the
`AddressInfo` type didn't become available until a future version of
`@types/node`.

Regardless, it seems to me that this should be inferred without any problem
and we don't actually rely on the `AddressInfo` type, and instead are only
looking for an interface which has `port`, `address` and `family`, as the
inferred return value from `http.Server.prototype.address()` does.

Author: abernix

packages/apollo-server/src/index.ts

@@ -4,7 +4,6 @@
 // you're not using express or your version doesn't quite match up.
 import express from 'express';
 import http from 'http';
-import net from 'net';
 import {
   ApolloServer as ApolloServerBase,
   CorsOptions,
@@ -37,7 +36,7 @@ export class ApolloServer extends ApolloServerBase {
     subscriptionsPath?: string,
   ): ServerInfo {
     const serverInfo: any = {
-      ...(server.address() as net.AddressInfo),
+      ...server.address(),
       server,
       subscriptionsPath,
     };