What's not working?

After I rename storybook config files, for example storybook.preview.js to storybook.preview.ts, storybook reverts back to default preview configuration.

How do we reproduce the bug?

1. init a ui library, i.e. yarn rw setup ui mantine
2. rename storybook.preview.js to storybook.preview.tsx
3. run storybook to see that providers/css files imported in preview file have no effect

What's your environment? (If it applies)

No response

Are you interested in working on this?

• I'm interested in working on this