yeah unit tests are coming..

> I would be worried that some parse error or non-obvious typo in the Markdown format

well I couldn't help this too much since it uses markdown-it under the hood to parse the markdown, i think it's safe as long as you don't write destructive shell script yourself..

> You may want to consider running the Node tasks in a separate subprocess instead of using `require-from-string` module in parent process.

will give this a try. also PR welcome xD