fix(gatsby-plugin-mdx): don't allow JS frontmatter by default (#35830)#35834

Merged

pieh merged 1 commit intorelease/3.14from backport-3.14-35830

Jun 2, 2022

+351-21

Commits on Jun 2, 2022

fix(gatsby-plugin-mdx): don't allow JS frontmatter by default (#35830 )
pieh
committed