[BUG] Uncaught TypeError: Class constructor gt cannot be invoked without 'new'

[benbenbenbenbenben]

Describe the bug
LitElement doesn't load. App is blank with error in console:

Uncaught TypeError: Class constructor gt cannot be invoked without 'new'

Is this connected to the fact native web components must use new but they're being transpiled?

To Reproduce
Steps to reproduce the behavior:

1. Checkout this repo
2. yarn build:static
3. cd build
4. http-server

Expected behavior
App loads

Desktop (please complete the following information):

• Browser: *