tsdx/test/e2e/fixtures/build-default/src/syntax/async.ts

// regression test for async/await
// code inspired by https://github.com/formium/tsdx/issues/869
let shouldBeTrue = false;
(async () => {
  shouldBeTrue = true; // a side effect to make sure this is output
  await Promise.resolve();
})();

export async function testAsync() {
  return await Promise.resolve(shouldBeTrue);
}