fix(typescript): Only use data in return type for functions

Fixes #50

src/graphql.ts

@@ -1,6 +1,6 @@
 import { request as Request } from "@octokit/request";
 import { GraphqlError } from "./error";
-import { Endpoint, Parameters, GraphQlQueryResponse } from "./types";
+import { Endpoint, Parameters, GraphQlQueryResponseData } from "./types";
 
 const NON_VARIABLE_OPTIONS = [
   "method",
@@ -15,7 +15,7 @@ export function graphql(
   request: typeof Request,
   query: string | Parameters,
   options?: Parameters
-): Promise<GraphQlQueryResponse> {
+): Promise<GraphQlQueryResponseData> {
   options =
     typeof query === "string"
       ? (options = Object.assign({ query }, options))

src/types.ts

@@ -9,15 +9,15 @@ export interface graphql {
    *
    * @param {object} endpoint Must set `method` and `url`. Plus URL, query or body parameters, as well as `headers`, `mediaType.{format|previews}`, `request`, or `baseUrl`.
    */
-  (options: Parameters): Promise<GraphQlQueryResponse>;
+  (options: Parameters): Promise<GraphQlQueryResponseData>;
 
   /**
    * Sends a request based on endpoint options
    *
    * @param {string} route Request method + URL. Example: `'GET /orgs/:org'`
    * @param {object} [parameters] URL, query or body parameters, as well as `headers`, `mediaType.{format|previews}`, `request`, or `baseUrl`.
    */
-  (query: Query, parameters?: Parameters): Promise<GraphQlQueryResponse>;
+  (query: Query, parameters?: Parameters): Promise<GraphQlQueryResponseData>;
 
   /**
    * Returns a new `endpoint` with updated route and parameters
@@ -30,8 +30,12 @@ export interface graphql {
   endpoint: typeof request.endpoint;
 }
 
+export type GraphQlQueryResponseData = {
+  [key: string]: any;
+} | null;
+
 export type GraphQlQueryResponse = {
-  data: { [key: string]: any } | null;
+  data: GraphQlQueryResponseData;
   errors?: [
     {
       message: string;