The regression in `concurrently` v3.2.0 (which made us roll back to v3.1.0 in #14378) has been fixed in v3.3.0 (see kimmobrunfeldt/concurrently#89).
This test ensures the `__esModule` is set on UMD bundles, thus making them compatible with SystemJS@^0.22.3. Followup from https://github.com/frankwallis/plugin-typescript/issues/185. PR Close #14196