fflate
High performance (de)compression in an 8kB package
png-async
A simple and non-blocking PNG encoder / decoder.
yieldable-json
An asynchronous yieldable version of JSON.stringify and JSON.parse
notiflix
Notiflix is a dependency-free, secure, and lightweight JavaScript library built with pure JavaScript, offering client-side non-blocking notifications, popup boxes, loading indicators, and more.