test: check typescript loader

test/es-module/test-typescript.mjs

@@ -324,3 +324,29 @@ test('execute a JavaScript file importing a cjs TypeScript file', async () => {
   match(result.stdout, /Hello, TypeScript!/);
   strictEqual(result.code, 0);
 });
+
+test('execute a TypeScript loader and a .ts file', async () => {
+  const result = await spawnPromisified(process.execPath, [
+    '--experimental-strip-types',
+    '--no-warnings',
+    '--import',
+    fixtures.fileURL('typescript/ts/test-loader.ts'),
+    fixtures.path('typescript/ts/test-typescript.ts'),
+  ]);
+  strictEqual(result.stderr, '');
+  match(result.stdout, /Hello, TypeScript!/);
+  strictEqual(result.code, 0);
+});
+
+test('execute a TypeScript loader and a .js file', async () => {
+  const result = await spawnPromisified(process.execPath, [
+    '--experimental-strip-types',
+    '--no-warnings',
+    '--import',
+    fixtures.fileURL('typescript/ts/test-loader.ts'),
+    fixtures.path('typescript/ts/test-simple.js'),
+  ]);
+  strictEqual(result.stderr, '');
+  match(result.stdout, /Hello, TypeScript!/);
+  strictEqual(result.code, 0);
+});

test/fixtures/typescript/ts/hook.ts

@@ -0,0 +1,6 @@
+import type { ResolveHook } from 'node:module';
+
+// Pass through
+export const resolve: ResolveHook = async function resolve(specifier, context, nextResolve) {
+    return nextResolve(specifier, context);
+};

test/fixtures/typescript/ts/test-loader.ts

@@ -0,0 +1,4 @@
+import { register } from 'node:module';
+import * as fixtures from '../../../common/fixtures.mjs';
+
+register(fixtures.fileURL('typescript/ts/hook.ts'));

test/fixtures/typescript/ts/test-simple.js

@@ -0,0 +1,2 @@
+const str = "Hello, TypeScript!";
+console.log(str);