fix: isObserved -> isObserving

src/observables.ts

@@ -239,12 +239,17 @@ export function computed<T, R = never>(
 }
 
 /**
- * Whether the current scope has any active observers.
+ * Whether the current scope is actively observing for any updates.
  */
-export function isObserved(): boolean {
-  return !!currentObserver?.[OBSERVING]?.size;
+export function isObserving(): boolean {
+  return [currentObserver, ...(currentObserver?.[CHILDREN] ?? [])].some(
+    (node) => node?.[OBSERVING]?.size,
+  );
 }
 
+/** @deprecated use `isObserving` */
+export const isObserved = isObserving;
+
 /**
  * Invokes the given function each time any of the observables that are read inside are updated
  * (i.e., their value changes). The effect is immediately invoked on initialization.

tests/isObserving.test.ts

@@ -0,0 +1,24 @@
+import { effect, isObserving, observable } from '../src';
+
+it('should return true if there are observers', () => {
+  const a = observable(0);
+
+  effect(() => {
+    a();
+    expect(isObserving()).toBeTruthy();
+  });
+});
+
+it('should return true if child is observing', () => {
+  const $a = observable(0);
+  effect(() => {
+    effect(() => void $a());
+    expect(isObserving()).toBeTruthy();
+  });
+});
+
+it('should return false if there are _no_ observers', () => {
+  effect(() => {
+    expect(isObserving()).toBeFalsy();
+  });
+});