Actually Angular does this with Zones which is a different Reactivity system. This is actually quite similar to what PostSharp did with WPF where it injected I

Actually Angular does this with Zones which is a different Reactivity system. This is actually quite similar to what PostSharp did with WPF where it injected INotifyPropertyChanged and WPF compiling its getters and setters. Then it's also similar to KnockoutJS (inspired by WPF), MobX (inspired by Knockout) and Vue (also inspired by Knockout)