Codesandbox preview never updates the worker

[kettanaito]

The issue

Our pull requests use a Codesandbox integration to generate a preview sandbox for the changes. While it correctly pulls the state of the msw package, it doesn't update the public/mockServiceWorker.js file as a part of the preview. This can lead to a broken sandbox once we introduce a breaking change to the client-worker communication.

Expected behavior

I'd expect Codesandbox config to support some bootstrap event where we could pull the mockServiceWorker.js file relevant to the built pull request (it doesn't have to be the latest, as pull requests may also change the worker file).

[kettanaito]

@msutkowski, hey, Matt 👋 Do you know if it's possible to execute some logic before Sandbox builds its preview?

[kettanaito]

It should be possible to use the startScript option of the codesandbox.config.json to execute a custom script whenever the sandbox starts. I cannot edit our MSW React template as the entire site gets broken once I unfreeze the template.

[kettanaito]

I've added the startScript option to the condesandbox.config.json, but it still doesn't execute that command before preparing the sandbox. I can clearly see the latest published worker instead of the latest commit worker per pull request it tries to preview.

Anytime I try to edit Codesandbox config live the entire page freezes and goes out of memory. I'm suspecting a Codesandbox issue.