buildStoriesJson should add stories.json entries for .svelte stories

[IanVS]

Is your feature request related to a problem? Please describe
I was trying to enable the test-runner for svelte-native story files using stories.json mode as suggested in storybookjs/test-runner#80 (comment), but I found that stories.json is not generated for .svelte stories, see

storybook/lib/core-server/src/utils/StoryIndexGenerator.ts

Lines 51 to 54 in 552b0d3

	if (!['.js', '.jsx', '.ts', '.tsx', '.mdx'].includes(ext)) {
	logger.info(`Skipping ${ext} file ${relativePath}`);
	return;
	}

.

Describe the solution you'd like
It would be cool if stories.json included .svelte files. Or, if that's not feasible, we should document it.

Are you able to assist to bring the feature to reality?
I doubt it.

[dimfeld]

I looked into this a bit when trying to make storyStoreV7 work with Svelte, and at a minimum the StoryIndexGenerator needs a way to use the CSF parser that currently lives in addon-svelte-csf instead of the normal CSF parser built into core.

See also #16673

[shilman]

Egads!! I just released https://github.com/storybookjs/storybook/releases/tag/v7.0.0-alpha.0 containing PR #18355 that references this issue. Upgrade today to the @future NPM tag to try it out!

npx sb upgrade --prerelease

Closing this issue. Please re-open if you think there's still more to do.

[IanVS]

This has been addressed in 7.0, which allows indexing svelte files. The latest 3.0.0 prerelease versions of @storybook/addon-svelte-csf use the new story indexer added in 7.0.