Yog Script (.ys, .yns) analyzed: its lexer, parser and syntax tree, names resolved, the class index model — what the build and the editors read a source with.
namespace System;
/// A handler of an event that tells nothing beyond who raised it.
public delegate void EventHandler(object? sender, EventArgs e);
/// A handler of an event that tells `TEventArgs`.
public delegate void EventHandler<TEventArgs>(object? sender, TEventArgs e);