Support remark/rehype/recma transformer plugins

[remcohaszing]

Initial checklist

• I read the support docs
• I read the contributing guide
• I agree to follow the code of conduct
• I searched issues and couldn’t find anything (or linked relevant results below)

Problem

Currentle the language service only supports unified plugins that register micromark syntax extensions. It doesn’t support transformer plugins yet.

For example, remark-mdx-frontmatter, rehype-mdx-title, and recma-nextjs-static-props provide a transformers that injects ESM exports into the AST.

Solution

TypeScript needs to be aware of injected variables and their types. I don’t know how yet.

Alternatives

🤷