🐛 BUG: New MDX release breaks if you disable the collect-headings plugin.

[eliasbrange]

What version of astro are you using?

v1.0.0-rc.5

Are you using an SSR adapter? If so, which one?

None

What package manager are you using?

yarn

What operating system are you using?

Windows (WSL 2)

Describe the Bug

The added functionality in MDX that adds headings and frontmatter to layout props (#4134) does not work if you disable the custom plugin collect-headings as specified here: https://docs.astro.build/ar/guides/integrations-guide/mdx/#configuration

If that plugin is disabled, the function getHeadings() does not exist.

Link to Minimal Reproducible Example

https://stackblitz.com/edit/github-6nege1?file=astro.config.mjs,src%2Fpages%2Findex.mdx,package.json&on=stackblitz

Participation

• I am willing to submit a pull request for this issue.

[bholmesdev]

Thanks for reporting! Agreed that getHeadings should always be applied. We decided to make our collect-headings plugin non-overridable for now. If you have a reason we should allow users to remove this plugin, we can re-open!