test: fix jest environment missing structuredClone (#2185)

packages/amplify-graphql-transformer-core/FixJestEnvironment.js

@@ -0,0 +1,16 @@
+const NodeEnvironment = require('jest-environment-node');
+
+class FixJestEnvironment extends NodeEnvironment {
+  constructor(...args) {
+    super(...args);
+    // https://github.com/jestjs/jest/issues/12628
+    // sturcturedClone is missing in the jest node environment.
+    // Newer versions of jest have fixed this, but is not possible to upgrade at this time.
+    // Newer versions of jest have a performance issue when not used with Node ^20.11.0
+    // https://github.com/jestjs/jest/issues/11956
+    // Our minimum supported version is Node 18.
+    this.global.structuredClone = structuredClone;
+  }
+}
+
+module.exports = FixJestEnvironment;

packages/amplify-graphql-transformer-core/package.json

@@ -76,6 +76,7 @@
     "coverageReporters": [
       "clover",
       "text"
-    ]
+    ],
+    "testEnvironment": "./FixJestEnvironment.js"
   }
 }