Core: iframe.html no longer built with --preview-url

Describe the bug Since upgrading to 6.2.7 from 6.1.21, we’re no longer seeing an iframe.html generated, and it seems the --preview-url flag has been removed from the CLI? I didn’t see any release notes about this, and it’s causing our CDN deploy to break. Our build script looks like this

STORYBOOK_BASE_URL=$STORYBOOK_BASE_URL yarn build:storybook:docs --preview-url="${STORYBOOK_BASE_URL}iframe.html"

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┆Issue is synchronized with this Asana task by Unito

[votemike]

@shilman I can confirm that your fix fixes the problem which I believe was the problem the OP had. However, it seems like a lot of people are using --preview-url to allow storybook to be served from a sub-directory as suggested here: https://github.com/storybookjs/storybook/issues/1291#issuecomment-795251283 Perhaps if there was some documentation on the correct way to serve storybook from a subdirectory and some more information on what --preview-url should be used for, there would not be this confusion and the need for cli options such as --force-build-preview

[shilman]

Ok thanks for explaining. I’ll see if i can restore the old behavior for now (or maybe fix the other bug?!), and there’s a good chance we’ll be revisiting the preview url feature in the coming months