Fix TS types

Author: danielrearden

src/connection/arrayconnection.d.ts

@@ -78,6 +78,6 @@ export function cursorForObjectInConnection<T>(
  * otherwise it will be the default.
  */
 export function getOffsetWithDefault(
-  cursor?: ConnectionCursor | null,
+  cursor: ConnectionCursor | null | undefined,
   defaultOffset: number,
 ): number;

src/connection/arrayconnection.js

@@ -153,7 +153,7 @@ export function cursorForObjectInConnection<T>(
  * otherwise it will be the default.
  */
 export function getOffsetWithDefault(
-  cursor?: ?ConnectionCursor,
+  cursor: ConnectionCursor | null | void,
   defaultOffset: number,
 ): number {
   if (typeof cursor !== 'string') {

src/node/node.d.ts

@@ -1,5 +1,6 @@
 import type {
   GraphQLFieldConfig,
+  GraphQLInterfaceType,
   GraphQLResolveInfo,
   GraphQLTypeResolver,
 } from 'graphql';