... okay then

src/subduxes.test.ts

@@ -0,0 +1,32 @@
+import { test, expect } from 'vitest';
+import { expectTypeOf } from 'expect-type';
+
+import Updux from './Updux.js';
+
+const subA = new Updux({
+    initialState: true,
+    actions: {
+        action1: (x: string) => x,
+    },
+    selectors: {
+        getAntiSub: (s) => !s,
+    },
+});
+
+const mainDux = new Updux({
+    subduxes: { subA },
+});
+
+test('subduxes resolves as objects', () => {
+    expectTypeOf(mainDux.initialState).toMatchTypeOf<{
+        subA: boolean;
+    }>();
+    expectTypeOf(mainDux.actions.action1('foo')).toMatchTypeOf<{
+        type: 'action1';
+        payload: string;
+    }>();
+    expectTypeOf(
+        mainDux.selectors.getAntiSub({ subA: true }),
+    ).toMatchTypeOf<boolean>();
+    expect(mainDux.selectors.getAntiSub({ subA: true })).toEqual(false);
+});