Module exports a Showdown converter instance.
const md = require('markdown-converter');
const text = '```javascript\nconst str = "test";\n```';
md.then((f) => {
console.log(f.makeHtml(text))
});
//'<p><syntax-highlight class="language-javascript"><pre><code class="language-javascript">const str = "test";\n</code></pre></syntax-highlight></p>'