test: .js extension in import

src/test/index.spec.ts

@@ -197,6 +197,22 @@ test.suite('ts-node', (test) => {
       expect(stdout).toBe('hello world\n');
     });
 
+    test.suite('should support js extension', (test) => {
+      test('test', async () => {
+        const { err, stdout } = await exec(
+          [
+            CMD_TS_NODE_WITHOUT_PROJECT_FLAG,
+            '-pe "import { main } from \'./index\';main()"',
+          ].join(' '),
+          {
+            cwd: join(TEST_DIR, 'import-with-js-extension'),
+          }
+        );
+        expect(err).toBe(null);
+        expect(stdout).toBe('hello world\n');
+      });
+    });
+
     test.suite('should support cts when module = CommonJS', (test) => {
       test.runIf(tsSupportsMtsCtsExtensions);
       test('test', async (t) => {

tests/import-with-js-extension/foo.ts

@@ -0,0 +1 @@
+export const helloWorld = 'hello world';

tests/import-with-js-extension/index.ts

@@ -0,0 +1,5 @@
+import { helloWorld } from './foo.js';
+
+export function main() {
+  console.log(helloWorld);
+}