I'm getting close to finishing the extension/plugin functionality for Feather Wiki, and I was able to successfully write a search extension using Fuse.js! The plugin will be included on the website when the new version with the extension support is ready :)
Unfortunately with respect to Feather Wiki, fuse.min.js is too large (23KB) :) But the fuzzy search is a good idea. If you find a very tiny js search lib, please post it here on HN or here: https://codeberg.org/Alamantus/FeatherWiki/issues
I did note your ":)", and I agree that compared to a total of 63kb, a 23kb addition can be quite large, but search is too important a feature, and I think it will be worthwhile.