Repository: nodejs/node
Pull request: test: adding more tests for strip-types

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In this MR I'm adding more tests created in this [PR](https://github.com/nodejs/node/pull/53725/files), testing generics and Utility Types.
This PR makes part of typescript iniciative on Node.

cc: @RedYetiDev @marco-ippolito @ErickWendel 


Changed files:
filename: test/es-module/test-typescript.mjs
patch: @@ -352,3 +352,36 @@ test('execute a TypeScript test mocking module', { skip: isWindows && process.ar
   match(result.stdout, /Hello, TypeScript-CommonJS!/);
   strictEqual(result.code, 0);
 });
+
+test('execute a TypeScript file with union types', async () => {
+  const result = await spawnPromisified(process.execPath, [
+    '--experimental-strip-types',
+    '--no-warnings',
+    fixtures.path('typescript/ts/test-union-types.ts'),
+  ]);
+
+  strictEqual(result.stderr, '');
+  strictEqual(result.stdout,
+              '{' +
+      " name: 'Hello, TypeScript!' }\n" +
+      '{ role: \'admin\', permission: \'all\' }\n' +
+      '{\n  foo: \'Testing Partial Type\',\n  bar: 42,\n' +
+      '  zoo: true,\n  metadata: undefined\n' +
+      '}\n');
+  strictEqual(result.code, 0);
+});
+
+test('expect error when executing a TypeScript file with generics', async () => {
+  const result = await spawnPromisified(process.execPath, [
+    '--experimental-strip-types',
+    fixtures.path('typescript/ts/test-parameter-properties.ts'),
+  ]);
+
+  // This error should be thrown during transformation
+  match(
+    result.stderr,
+    /TypeScript parameter property is not supported in strip-only mode/
+  );
+  strictEqual(result.stdout, '');
+  strictEqual(result.code, 1);
+});

filename: test/fixtures/typescript/ts/test-parameter-properties.ts
patch: @@ -0,0 +1,15 @@
+interface Bar {
+  name: string;
+  age: number;
+}
+
+class Test<T> {
+  constructor(private value: T) {}
+
+  public getValue(): T {
+    return this.value;
+  }
+}
+
+const foo = new Test<Bar>({ age: 42, name: 'John Doe' });
+console.log(foo.getValue());

filename: test/fixtures/typescript/ts/test-union-types.ts
patch: @@ -0,0 +1,53 @@
+// Use Some Union Types Together
+const getTypescript = async () => {
+  return {
+    name: 'Hello, TypeScript!',
+  };
+};
+
+type MyNameResult = Awaited<ReturnType<typeof getTypescript>>;
+const myNameResult: MyNameResult = {
+  name: 'Hello, TypeScript!',
+};
+
+console.log(myNameResult);
+
+type RoleAttributes =
+  | {
+      role: 'admin';
+      permission: 'all';
+    }
+  | {
+      role: 'user';
+    }
+  | {
+      role: 'manager';
+    };
+
+// Union Type: Extract
+type AdminRole = Extract<RoleAttributes, { role: 'admin' }>;
+const adminRole: AdminRole = {
+  role: 'admin',
+  permission: 'all',
+};
+
+console.log(adminRole);
+
+type MyType = {
+  foo: string;
+  bar: number;
+  zoo: boolean;
+  metadata?: unknown;
+};
+
+// Union Type: Partial
+type PartialType = Partial<MyType>;
+
+const PartialTypeWithValues: PartialType = {
+  foo: 'Testing Partial Type',
+  bar: 42,
+  zoo: true,
+  metadata: undefined,
+};
+
+console.log(PartialTypeWithValues);