Maybe somebody finds it useful, but here’s an another attempt to create a markdown stream parser (NPM package)
github https://github.com/Lixpi/markdown-stream-parser
Also posted it here Another attempt to parse Markdown stream in real time
You can preview it on demo page here
Please keep in mind that it’s on a very early stage, but I find it quite useful for my own purposes.
Also please scroll the the end of the readme on github page, the you can find some information about potentially more advanced techniques.
Any criticism, feedback, suggestions etc are absolutely welcome!