Maybe you should take a look at Gatsby by Kyle Mathews.
Gatsby uses Webpack and React to process Markdown files to HTML.
Haven't tested it yet, but I think it looks promising.
The problem of Gatsby in its current form is that this generator doesn't scale at all. It embed all content in your javascript bundle. Which is ok for just a couple of pages. Another similar react/webpack based generator exists (linked below, https://phenomic.io/) and explain well the different between itself and Gatsby in its FAQ https://phenomic.io/docs/faq/gatsby/.