This looks really cool, I can't tell if it is a sandbox environment or not.
Does it download the dependencies on the client side, and compile the JS on the client side as well?
Does it download the dependencies on the client side, and compile the JS on the client side as well?
A hidden "feature" is that we automatically run tests defined (e.g. index.test.js) using jest, and dispatch the test results. So you can listen to that as well.
If it is all happening in the users browser, what's do you mean when you say "it does this on a different domain"