fix: make NonNull count field (for better type defs in Relay Modern)

Author: nodkz

package.json

@@ -68,7 +68,7 @@
     "watch": "jest --watch",
     "coverage": "jest --coverage",
     "lint": "eslint --ext .js ./src",
-    "flow": "./node_modules/.bin/flow stop && ./node_modules/.bin/flow",
+    "flow": "./node_modules/.bin/flow",
     "test": "npm run coverage && npm run lint && npm run flow",
     "link": "yarn build && yarn link graphql-compose && yarn link",
     "unlink": "yarn unlink graphql-compose && yarn add graphql-compose",

src/types/__tests__/connectionType-test.js

@@ -61,7 +61,8 @@ describe('types/connectionType.js', () => {
 
     it('should have field `count` with provided Type', () => {
       const tc = new TypeComposer(prepareConnectionType(userTypeComposer));
-      expect(tc.getFieldType('count')).toBe(GraphQLInt);
+      expect(tc.getFieldType('count')).toBeInstanceOf(GraphQLNonNull);
+      expect(tc.getFieldType('count').ofType).toBe(GraphQLInt);
     });
 
     it('should have field `pageInfo` with GraphQLNonNull(PageInfoType)', () => {

src/types/connectionType.js

@@ -60,7 +60,7 @@ export function prepareConnectionType(typeComposer: TypeComposer): GraphQLObject
     description: 'A connection to a list of items.',
     fields: () => ({
       count: {
-        type: GraphQLInt,
+        type: new GraphQLNonNull(GraphQLInt),
         description: 'Total object count.',
       },
       pageInfo: {