I work at Astro (https://astro.build), where we do a lot of Markdown / MDX and performance in this area is often a bottleneck. Our users use a lot of plugins to process their Markdown, so just blindly moving everything to a native language would make things a bit rigid. Inspired by the oxc and LightningCSS projects, I decided to start to start working on an "ideal" Markdown pipeline: The expensive stuff in Rust, with flexible plugins in JS, but with little performance cost.
This project uses techniques like lazy deserialization, raw transfer, arenas etc to ensure top performance. A JS plugin that only visits, ex, headings shouldn't suffer from the serialization cost of the entire Markdown tree. On the Rust side this is backed by pulldown-cmark, a really fast parser for Markdown.
You can try it in the browser here: https://satteri.erika.florist, or follow the instructions in the README to try it out locally: https://github.com/bruits/satteri/blob/main/packages/satteri...
Hope you'll like it! Don't hesitate if you have any questions.
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