Here's the mu.js and wu.js files that could be used to generate a simple blog.
What is mu? What is wu?

Project Folder

Project /
    mu.js
    wu.js
    markdown/
        post-about-something.md
        something-else.md
        another-post.md
    www/ (build folder)

mu.js

'use strict'

const mu = require('/Users/path/to/mu')
const wu = require('./wu.js')

const build = async () => {
    const rootFolder = './www' 

    try {
        const blogPosts = await mu.readFiles('markdown')
        const indexPosts = blogPosts.slice()

        for (let post of blogPosts) {
            post.destination = rootFolder
            post.ext = '.html'
            post.content = mu.marked(post.content) //md to html
            post.content = wu.layout(post)
            mu.writeFile(post)
        }

        // Index

        // Sort index in reverse chronological order
        indexPosts.sort((a, b) => (a.created > b.created) ? -1 : 1)

        // Create a preview for each post
        for (let post of indexPosts) {
            post.content = mu.stripMarkdown(post.content) 

            if (post.content.length > 200) {
                post.content = post.content.substring(0,180) + '...'
            }
        }

        let postsPerPage = 2
        index = mu.merge(indexPosts, postsPerPage)
        mu.paginateFiles(index)

        for (let page of index) {
            page.destination = rootFolder
            page.ext = '.html'
            page.title = 'Blog'
            page.content = wu.layout(page)
            mu.writeFile(page)
        }
    }
    catch (e) {
        console.log(e)
    }

wu.js

'use strict'

const wu = {}

// Layouts 

wu.layout = (page) => {
    return `${wu.head(page)}
    <body>
        ${wu.logo)}
        <div class="wrap">
              <div class="content">
                ${page.content}
            </div>
        </div>
        ${wu.footer()}
    </body>
    `
}


// Components 

wu.head = (page) => {
    return `<!doctype html>
    <head>
        <meta charset="utf-8">
        <title>${page.title}</title>
        <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
        <link rel="stylesheet" type="text/css" href="/resources/blog.css">
    </head>`
}

wu.banner = () => {
    return `<img src="resources/banner.gif">`
}

wu.logo = () => {
    return `
    <div id="logo">
            <a href="https://myblog.com">
                <img id="mw-logo" src="/resources/logo.png" />
            </a>
    </div>
    `
}

wu.footer = () => {
    return `
    <div id="footer">
        Some stuff that would go in a footer
    </div>`
}

module.exports = wu
@monkwest