add test

e2e/__tests__/esmConfigFile.test.ts

@@ -54,3 +54,15 @@ test('reads config from ts file when package.json#type=module', () => {
     name: 'Config from ts file',
   });
 });
+
+test('reads config from ts file with modern resolution when package.json#type=module', () => {
+  const {configs} = getConfig('esm-config/ts-modern', [], {
+    skipPkgJsonCheck: true,
+  });
+
+  expect(configs).toHaveLength(1);
+  expect(configs[0].displayName).toEqual({
+    color: 'white',
+    name: 'Config from modern ts file',
+  });
+});

e2e/esm-config/ts-modern/__tests__/test.js

@@ -0,0 +1,10 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+test('dummy test', () => {
+  expect(1).toBe(1);
+});

e2e/esm-config/ts-modern/jest.config.ts

@@ -0,0 +1,10 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import config from './some-other-file.js';
+
+export default () => config;

e2e/esm-config/ts-modern/package.json

@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}

e2e/esm-config/ts-modern/some-other-file.ts

@@ -0,0 +1,20 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+// allows to make sure that `ts-node` compiles the config file without a need to build Jest types
+// integration tests of Jest types run in a separate CI job through `jest.config.ts.mjs`
+type DummyConfig = {
+  displayName: string;
+  testEnvironment: string;
+};
+
+const config: DummyConfig = {
+  displayName: 'Config from modern ts file',
+  testEnvironment: 'node',
+};
+
+export default config;

e2e/esm-config/ts-modern/tsconfig.json

@@ -0,0 +1,8 @@
+{
+  "compilerOptions": {
+    "target": "esnext",
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "strict": true
+  }
+}