fix: hasPreviousPage should return true if after is present

Author: nodkz

src/__tests__/connectionResolver-test.js

@@ -363,6 +363,9 @@ describe('connectionResolver', () => {
         it('If last was not set (and first is empty), return true.', () => {
           expect(preparePageInfo(fiveEdges, {}, 5, 2).hasPreviousPage).toBe(true);
         });
+        it('If last was not set (but after is present), return true.', () => {
+          expect(preparePageInfo(fiveEdges, { after: 'abc' }, 5, 0).hasPreviousPage).toBe(true);
+        });
         it('If edges contains more than last elements, return true.', () => {
           expect(preparePageInfo(fiveEdges, { last: 3 }, 3, 2).hasPreviousPage).toBe(true);
         });

src/connectionResolver.js

@@ -281,6 +281,7 @@ export function preparePageInfo(
   args: {
     last?: ?number,
     first?: ?number,
+    after?: string,
   },
   limit: number,
   skip: number
@@ -302,7 +303,7 @@ export function preparePageInfo(
     } else {
       pageInfo.endCursor = edges[edges.length - 1].cursor;
     }
-    pageInfo.hasPreviousPage = (!!args.last || !args.first) && skip > 0;
+    pageInfo.hasPreviousPage = (!!args.last || !args.first) && (skip > 0 || !!args.after);
     pageInfo.hasNextPage = (!!args.first || !args.last) && hasExtraRecords;
   }