first commit

packages/reactive/test/signal.test.ts

@@ -0,0 +1,17 @@
+import { expect, test } from "bun:test";
+import { signal } from "../src/index.ts";
+
+test("signal skips equal writes and supports safe unsubscribe during notification", () => {
+  const count = signal(0);
+  const seen: number[] = [];
+  let off = () => {};
+  off = count.subscribe((value) => {
+    seen.push(value);
+    off();
+  });
+  count.set(0);
+  count.update((value) => value + 1);
+  count.set(2);
+  expect(seen).toEqual([1]);
+  expect(count.get()).toBe(2);
+});