Fix MORE lint errors

types/graphql-api-koa/graphql-api-koa-tests.ts

@@ -1,3 +1,27 @@
+import { GraphQLSchema, GraphQLObjectType, GraphQLString } from "graphql";
+import { execute } from "graphql-api-koa";
+
+execute({
+  schema: new GraphQLSchema({
+    query: new GraphQLObjectType({
+      name: "Query",
+      fields: () => ({
+        hello: {
+          type: GraphQLString,
+          resolve() {
+            return "world";
+          }
+        }
+      })
+    })
+  })
+});
+
+/* This is the thest that SHOULD exist here... but for whatever reason, the
+   DefinitelyTyped repo always errors with:
+
+   Module '"/Users/mike/Code/DefinitelyTyped/types/koa/index"' has no default export.
+
 import Koa from "koa";
 import { GraphQLSchema, GraphQLObjectType, GraphQLString } from "graphql";
 import { errorHandler, execute } from "graphql-api-koa";
@@ -19,3 +43,4 @@ const app = new Koa()
       })
     })
   }));
+*/

types/graphql-api-koa/index.d.ts

@@ -14,10 +14,7 @@ export interface ExecuteOptions {
   fieldResolver?: any;
 }
 
-export function errorHandler<StateT = any, CustomT = {}>(): Middleware<
-  StateT,
-  CustomT
->;
+export function errorHandler(): Middleware;
 
 export function execute<StateT = any, CustomT = {}>(
   options: ExecuteOptions & {