fix: add return type annotation

Author: wolfy1339

src/index.ts

@@ -3,8 +3,15 @@ import { createIterator } from "./iterator.js";
 import { createPaginate } from "./paginate.js";
 export type { PageInfoForward, PageInfoBackward } from "./page-info.js";
 
-export function paginateGraphQL(octokit: Octokit) {
-  octokit.graphql;
+type paginateGraphQLInterface = {
+  graphql: Octokit["graphql"] & {
+    paginate: ReturnType<typeof createPaginate> & {
+      iterator: ReturnType<typeof createIterator>;
+    };
+  };
+};
+
+export function paginateGraphQL(octokit: Octokit): paginateGraphQLInterface {
   return {
     graphql: Object.assign(octokit.graphql, {
       paginate: Object.assign(createPaginate(octokit), {