test(typescript): Add test for optional chaining (#207)

* test(typescript): Add test for optional chaining

* Skip failing test for now

Co-authored-by: Tiger Oakes <contact@tigeroakes.com>

Author: bennypowers

packages/typescript/test/fixtures/optional-chaining/main.ts

@@ -0,0 +1,8 @@
+interface OC {
+  a: number;
+  b?: {
+    c?: number;
+  };
+}
+const o = { a: 1 } as OC;
+export default o.b?.c ?? 'NOT FOUND';

packages/typescript/test/test.js

@@ -525,6 +525,16 @@ test('supports CommonJS imports when the output format is CommonJS', async (t) =
   t.is(output, 'exported from commonjs');
 });
 
+test.skip('supports optional chaining', async (t) => {
+  const bundle = await rollup({
+    input: 'fixtures/optional-chaining/main.ts',
+    plugins: [typescript({ module: 'esnext', target: 'esnext' })],
+    onwarn
+  });
+  const output = await evaluateBundle(bundle);
+  t.is(output, 'NOT FOUND');
+});
+
 function fakeTypescript(custom) {
   return Object.assign(
     {