Update 'graphql-js'

package.json

@@ -64,7 +64,7 @@
     "express": "4.17.1",
     "flow-bin": "0.125.1",
     "graphiql": "0.17.5",
-    "graphql": "14.5.8",
+    "graphql": "15.0.0",
     "mocha": "6.2.2",
     "multer": "1.4.2",
     "nyc": "14.1.1",
@@ -78,6 +78,6 @@
     "unfetch": "4.1.0"
   },
   "peerDependencies": {
-    "graphql": "^14.4.1"
+    "graphql": "^14.6.0 || ^15.0.0"
   }
 }

src/__tests__/http-test.js

@@ -1312,7 +1312,7 @@ function urlString(urlParams?: ?{ [param: string]: mixed, ... }) {
         expect(JSON.parse(response.text)).to.deep.equal({
           errors: [
             {
-              message: 'Syntax Error: Unexpected Name "syntaxerror"',
+              message: 'Syntax Error: Unexpected Name "syntaxerror".',
               locations: [{ line: 1, column: 1 }],
             },
           ],
@@ -1587,7 +1587,7 @@ function urlString(urlParams?: ?{ [param: string]: mixed, ... }) {
             {
               locations: [{ column: 16, line: 1 }],
               message:
-                'Variable "$who" got invalid value ["Dolly", "Jonty"]; Expected type String. String cannot represent a non string value: ["Dolly", "Jonty"]',
+                'Variable "$who" got invalid value ["Dolly", "Jonty"]; String cannot represent a non string value: ["Dolly", "Jonty"]',
             },
           ],
         });

types/index.d.ts

@@ -5,6 +5,7 @@ import {
   Source,
   ASTVisitor,
   DocumentNode,
+  ValidationRule,
   ValidationContext,
   ExecutionArgs,
   ExecutionResult,
@@ -14,9 +15,6 @@ import {
   GraphQLTypeResolver,
 } from 'graphql';
 
-// TODO: Temporary until we update TS typings for 'graphql' package
-import { ValidationRule } from 'graphql/validation/ValidationContext';
-
 export = graphqlHTTP;
 
 type Request = IncomingMessage;