patch-package
--- a/node_modules/apollo-server-core/dist/types.d.ts
+++ b/node_modules/apollo-server-core/dist/types.d.ts
@@ -1,7 +1,7 @@
 import { GraphQLSchema, DocumentNode } from 'graphql';
 import { SchemaDirectiveVisitor, IResolvers, IMocks } from 'graphql-tools';
 import { ConnectionContext } from 'subscriptions-transport-ws';
-import WebSocket from 'ws';
+import * as WebSocket from 'ws';
 import { GraphQLExtension } from 'graphql-extensions';
 export { GraphQLExtension } from 'graphql-extensions';
 import { EngineReportingOptions } from 'apollo-engine-reporting';