WIP

engine/lib/Signal.ts

@@ -0,0 +1,28 @@
+type Current = null | (() => void);
+
+let current: Current = null;
+
+export function createSignal<T>(value: T): [() => T, (value: T) => void] {
+	let innerValue = value;
+	const observers = new Set<() => void>();
+
+	const getter = () => {
+		current !== null && observers.add(current);
+
+		return innerValue;
+	};
+	const setter = (value: T) => {
+		innerValue = value;
+		for (const observer of observers) {
+			observer();
+		}
+	};
+
+	return [getter, setter];
+}
+
+export function createEffect(callback: () => void) {
+	current = callback;
+	callback();
+	current = null;
+}