Module 'parse5' as import syntax (#4015)

package.json

@@ -67,6 +67,7 @@
 		"@types/nodemailer": "4.6.5",
 		"@types/nprogress": "0.0.29",
 		"@types/oauth": "0.9.1",
+		"@types/parse5": "5.0.0",
 		"@types/parsimmon": "1.10.0",
 		"@types/portscanner": "2.1.0",
 		"@types/pug": "2.0.4",

src/mfm/fromHtml.ts

@@ -1,10 +1,10 @@
-const parse5 = require('parse5');
+import { parseFragment, DefaultTreeDocumentFragment } from 'parse5';
 import { URL } from 'url';
 
 export function fromHtml(html: string): string {
 	if (html == null) return null;
 
-	const dom = parse5.parseFragment(html);
+	const dom = parseFragment(html) as DefaultTreeDocumentFragment;
 
 	let text = '';