Fact is testing frontend code is really hard _because_ people don't build frontend code in isolation. I found that testing is much easier when using tools like

Fact is testing frontend code is really hard _because_ people don't build frontend code in isolation. I found that testing is much easier when using tools like storybook and browser-based testing tool (so no snapshot testing, no fake-dom). Right now I am working on a legacy project with ~10 years of work into it, about 15% of the code in there I don't even know how to trigger in the application (lots of weird specific circumstances that require special types of accounts to trigger). I just had to make a small change to hundreds of files and it was hell to manually test it everywhere. IMO almost all components should be able to be renderable in isolation and mocked data. Type systems help with this problem because they remove a whole layer of tests required, but it is not enough.