[azu]

> technically speaking is based on Webkit, but can't really say why

Why Bun uses WebKit/JSC was described here:

> One of the reasons why Bun bet on JavaScriptCore instead of embracing the server-side V8 monoculture is because JavaScriptCore and WebKit/Safari are strongly tied together. This means that Bun can often use implementations of Web APIs from WebKit/Safari directly, without having to reimplement them. This is a great example of that.

via https://bun.sh/blog/bun-v0.7.1#messageport-messagechannel-ar...