test: fix flowtype checks

Related #61

.eslintignore

@@ -0,0 +1,3 @@
+lib/
+es/
+coverage/

src/definition.js

@@ -2,6 +2,7 @@
 
 import type { BatchRequestMap } from './middleware/batch';
 
+export type FetchWithMiddleware = (req: RRNLRequestObject) => Promise<RRNLResponsePayload>;
 export type MiddlewareNextFn = (req: RRNLRequestObject) => Promise<RRNLResponseObject>;
 export type Middleware = (next: MiddlewareNextFn) => MiddlewareNextFn;
 // {
@@ -53,6 +54,11 @@ export type GraphQLResponse = {
   errors?: GraphQLResponseErrors,
 };
 
+export type RRNLResponsePayload = {|
+  +data: ?mixed,
+  +errors?: ?mixed,
+|};
+
 export type RRNLResponseObject = {
   ok: any,
   status: number,

src/fetchWithMiddleware.js

@@ -8,6 +8,7 @@ import type {
   RRNLResponseObject,
   MiddlewareNextFn,
   RRNLOptions,
+  RRNLResponsePayload,
 } from './definition';
 
 function runFetch(req: RRNLRequestObject): Promise<RRNLResponseObject> {
@@ -43,7 +44,7 @@ export default function fetchWithMiddleware(
   req: RRNLRequestObject,
   middlewares: Middleware[],
   options: RRNLOptions
-): Promise<any> {
+): Promise<RRNLResponsePayload> {
   const wrappedFetch: MiddlewareNextFn = compose(...middlewares)(runFetch);
 
   return wrappedFetch(req).then(res => {

src/relayMutation.js

@@ -4,12 +4,12 @@
 import type {
   RRNLRequestObjectMutation,
   RelayClassicRequest,
-  MiddlewareNextFn,
+  FetchWithMiddleware,
 } from './definition';
 
 export default function mutation(
   relayRequest: RelayClassicRequest,
-  fetchWithMiddleware: MiddlewareNextFn
+  fetchWithMiddleware: FetchWithMiddleware
 ): Promise<any> {
   const commonReq: $Shape<RRNLRequestObjectMutation> = {
     method: 'POST',

src/relayQueries.js

@@ -1,11 +1,15 @@
 /* @flow */
 /* eslint-disable no-param-reassign, prefer-template */
 
-import type { RelayClassicRequest, MiddlewareNextFn, RRNLRequestObjectQuery } from './definition';
+import type {
+  RelayClassicRequest,
+  FetchWithMiddleware,
+  RRNLRequestObjectQuery,
+} from './definition';
 
 export default function queries(
   relayRequestList: RelayClassicRequest[],
-  fetchWithMiddleware: MiddlewareNextFn
+  fetchWithMiddleware: FetchWithMiddleware
 ): Promise<any> {
   return Promise.all(
     relayRequestList.map(relayRequest => {