diff --git a/jest.config.js b/jest.config.js
new file mode 100644
index 00000000..4387dae6
--- /dev/null
+++ b/jest.config.js
@@ -0,0 +1,24 @@
+'use strict'
+
+/** @type {import('jest').Config} */
+module.exports = {
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+  rootDir: './test/typescript-jest',
+  testMatch: ['**/*.test.ts'],
+  // cookie@2 (pulled in by light-my-request) is ESM-only and must be
+  // transpiled to CJS for this suite, which runs in CommonJS via ts-jest.
+  transformIgnorePatterns: ['/node_modules/(?!cookie/)'],
+  transform: {
+    '^.+\\.(ts|tsx|js)$': [
+      'ts-jest',
+      {
+        tsconfig: {
+          allowJs: true,
+          esModuleInterop: true,
+          types: ['jest', 'node']
+        }
+      }
+    ]
+  }
+}
diff --git a/package.json b/package.json
index 031f2f42..340722d5 100644
--- a/package.json
+++ b/package.json
@@ -101,29 +101,7 @@
   "overrides": {
     "vitest": "5.0.1"
   },
-  "jest": {
-    "preset": "ts-jest",
-    "testEnvironment": "node",
-    "rootDir": "./test/typescript-jest",
-    "testMatch": [
-      "**/*.test.ts"
-    ],
-    "transform": {
-      "^.+\\.(ts|tsx)$": [
-        "ts-jest",
-        {
-          "tsconfig": {
-            "esModuleInterop": true,
-            "types": [
-              "jest",
-              "node"
-            ]
-          }
-        }
-      ]
-    }
-  },
   "publishConfig": {
     "access": "public"
   }
-}
+}
\ No newline at end of file