Currently i'm parsing bbcode server side but i'd like to show a preview just like this site does.
If I process the bbcode serverside using ajax it's a bit laggy, so i thought doing it client side, to just show the preview.
Your best options are probably to roll your own solution (possibly basing your work off one of the two links here), or just use AJAX and move on. That's probably the best way to ensure that previews are accurate, and previewing doesn't have to be real-time on every keypress, anyway; a delay before even sending the request is acceptable.
It may not be as flexible in some ways as other possible projects out there, but it does allow defining your own codes ("bb-code" or not, with quite a few properties), and is also all contained within the one file. This is not a simple find-and-replace parser, and is not based on regex.
If this is of any interest to you, it might save you from having to convert that other library. Technically, I'm a relative "unknown", but that's the great things about JS/OSS: you can check out the source to see what I've done.
 As a result, there are a few remaining "compatibility functions", but I rewrote things which had native equivalents available.
I encountered the same problem, so I wrote my own. That supports BBCode -> AST Array -> any kind of markup, now supports HTML and React. And has plugins and presets support
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