Avoid export default

src/mfm/fromHtml.ts

@@ -1,7 +1,7 @@
 const parse5 = require('parse5');
 import { URL } from 'url';
 
-export default function(html: string): string {
+export function fromHtml(html: string): string {
 	if (html == null) return null;
 
 	const dom = parse5.parseFragment(html);