release: WRNexusJS 0.4.0

packages/reactive/test/signal.test.ts

@@ -1,5 +1,5 @@
 import { describe, expect, test } from "bun:test";
-import { batch, computed, effect, signal } from "../src/index.ts";
+import { batch, computed, effect, resource, signal, watch } from "../src/index.ts";
 
 describe("reactive primitives", () => {
   test("signals skip no-op updates", () => {
@@ -45,3 +45,35 @@ describe("reactive primitives", () => {
     expect(seen).toEqual([0, 1]);
   });
 });
+
+test("watch reports undefined as the previous value for an immediate run", () => {
+  const value = signal(1);
+  const seen: Array<[number, number | undefined]> = [];
+  const stop = watch(
+    () => value.get(),
+    (next, previous) => void seen.push([next, previous]),
+    { immediate: true },
+  );
+  value.set(2);
+  stop();
+
+  expect(seen).toEqual([
+    [1, undefined],
+    [2, 1],
+  ]);
+});
+
+test("aborting a pending resource does not dereference a cleared controller", async () => {
+  let resolve!: (value: string) => void;
+  const pending = new Promise<string>((done) => {
+    resolve = done;
+  });
+  const value = resource(() => pending);
+  const run = value.run();
+  value.abort("cancelled");
+  resolve("late");
+
+  await expect(run).resolves.toBeUndefined();
+  expect(value.status.get()).toBe("idle");
+  expect(value.data.get()).toBeUndefined();
+});