This is just a repackaging of the markdown parsing functionality for Busy.org. The repo can be found here, which is based off of the code for Steem Condenser.
The files are mostly unchanged, but any changes I made are tracked in my Github repo here.
All code in the busy folder is under the original license from Busy (see BUSY_LICENSE.md in the folder for more information).
npm install steem-markdown
const steemMarkdown = require('steem-markdown')
const parsedMarkdown = steemMarkdown(markdown)