add a generateJSON utility to the HTML package

packages/html/src/generateJSON.ts

@@ -0,0 +1,13 @@
+import { DOMParser } from 'prosemirror-model'
+import { getSchema, Extensions } from '@tiptap/core'
+// @ts-ignore
+import { parseHTML } from 'hostic-dom'
+
+export default function generateJSON(html: string, extensions: Extensions): Record<string, any> {
+  const schema = getSchema(extensions)
+  const dom = parseHTML(html)
+
+  return DOMParser.fromSchema(schema)
+    .parse(dom)
+    .toJSON()
+}