A new CLI option to execute a shell command when Storybook is ready

[andyearnshaw]

Is your feature request related to a problem? Please describe.

I'm using Cypress and Storybook together and I was surprised to see that there is no built-in way to run them together. I'm using start-server-and-test to work around this, but it's yet another dependency that I could do without.

Describe the solution you'd like

Storybook seems like the best-placed app to provide this option. Something as simple as --exec. That way, I could do this:

"ci:cypress": "storybook dev --ci -p 6006 --exec 'npm cy:run'"

This would follow these steps:

1. Storybook starts up
2. Once compilation has finished, execute the shell command
3. When the shell command exits, exit Storybook (with a non-zero code if the command fails)

Describe alternatives you've considered

I could request something like this for Cypress (it already does a short wait for the server, but it's non-configurable). However, there are other test runners, for example CucumberJS + Puppeteer, that could benefit from this being in Storybook.

Are you able to assist to bring the feature to reality?

yes, I can

Additional context

No response