Signals: explicit graph, fine-grained updates

Angular's take on fine-grained reactivity

Signals make reactive state explicit and track dependencies automatically. signal() holds a value, computed() derives from other signals, effect() reacts to changes. Templates that read signals update only the expressions whose dependencies changed — no more full-tree checks.

count = signal(0);
double = computed(() => this.count() * 2);

increment() { this.count.update(c => c + 1); }

// in the template: {{ count() }} and {{ double() }}

Contrast with classic change detection →