This is a TS-implementation of CommonMark, developed from the JS-implementation commonmark.js.
This uses a compiling mechanism, i.e., compile while editing. It finds the smallest dirty node, and recompiles that node only, reusing unrelated nodes within the dirty node. So it is very efficient for editing.
cd /path_to/commonmark.ts
# deno 2.5.6
deno test -R # 1 passed (782 steps)