story_rendered event

[Diokuz]

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

I have a playwright test which:

1. go to my storybook
2. wait until page load event
3. start to check something ← and fail, because story still not rendered

Describe the solution you'd like

Some API which could tell me: whether my story ever rendered, or not?

Describe alternatives you've considered

Not I put some code to my component:

// my component456 render:
window.__myStory456Rendered = true

and then wait for it in the test:

await expect.poll(async () => page.evaluate(() => !!window.__myStory456Rendered)).toBeTruthy()

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

no

Additional context

I use CSF 3.0 and Storybook 8.1.

I just want to be 100% sure my story rendered, regardless of component I used.

Also, I dont want to overcomplicate my stories source code (particularly I dont want to use play functions). Only test code.

Probably related to #10893