implement defer support

Author: trevor-scheer

.circleci/config.yml

@@ -43,6 +43,18 @@ jobs:
       - run: npm run test:ci
       - store_test_results:
           path: junit.xml
+  Incremental Delivery:
+    docker:
+    - image: cimg/base:stable
+    environment:
+      INCREMENTAL_DELIVERY_TESTS_ENABLED: t
+    steps:
+      - setup-node:
+          node-version: "18"
+      # Install a prerelease of graphql-js 17 with incremental delivery support.
+      # --legacy-peer-deps because nothing expects v17 yet.
+      - run: npm i --legacy-peer-deps graphql@17.0.0-alpha.1.canary.pr.3361.04ab27334641e170ce0e05bc927b972991953882
+      - run: npm run test:ci
   Lint:
     docker:
       - image: cimg/base:stable
@@ -69,3 +81,4 @@ workflows:
                 - "16"
                 - "18"
                 - "20"
+      - Incremental Delivery

jest.config.ts

@@ -22,6 +22,7 @@ const config: Config.InitialOptions = {
 	},
 	// TODO: Remove this once the following issue is resolved:
 	testNamePattern: "^((?!MUST\\ require\\ a\\ request\\ body\\ on\\ POST).)*$",
+	setupFiles: ["./tests/jest.setup.ts"],
 };
 
 export default config;