fix: resolve type errors across test suite

tests/unit/routers.test.ts

@@ -0,0 +1,73 @@
+import { describe, test, expect } from "bun:test";
+import { Hono } from "hono";
+
+/**
+ * Tests for the router aggregation pattern used throughout the app.
+ * Each router imports route modules and mounts them.
+ */
+describe("Router pattern", () => {
+  test("mounting multiple routes via Object.values pattern", () => {
+    // Simulate the pattern used in companyRouter.ts
+    const route1 = new Hono().get("/items", (c) => c.json({ route: "items" }));
+    const route2 = new Hono().get("/count", (c) => c.json({ route: "count" }));
+
+    const routes = { route1, route2 };
+    const router = new Hono();
+    Object.values(routes).map((r) => router.route("/", r));
+
+    // Mount router under a prefix
+    const app = new Hono();
+    app.route("/v1/resource", router);
+
+    return Promise.all([
+      (async () => {
+        const res = await app.request("/v1/resource/items");
+        expect(res.status).toBe(200);
+        const body: any = await res.json();
+        expect(body.route).toBe("items");
+      })(),
+      (async () => {
+        const res = await app.request("/v1/resource/count");
+        expect(res.status).toBe(200);
+        const body: any = await res.json();
+        expect(body.route).toBe("count");
+      })(),
+    ]);
+  });
+
+  test("nested route parameters work correctly", async () => {
+    const route = new Hono().get("/items/:id", (c) =>
+      c.json({ id: c.req.param("id") }),
+    );
+
+    const router = new Hono();
+    router.route("/", route);
+
+    const app = new Hono();
+    app.route("/v1/test", router);
+
+    const res = await app.request("/v1/test/items/abc-123");
+    expect(res.status).toBe(200);
+    const body: any = await res.json();
+    expect(body.id).toBe("abc-123");
+  });
+
+  test("error propagation through router chain", async () => {
+    const route = new Hono().get("/fail", () => {
+      throw new Error("Boom!");
+    });
+
+    const router = new Hono();
+    router.route("/", route);
+
+    const app = new Hono();
+    app.onError((err, c) => c.json({ error: err.message, caught: true }, 500));
+    app.route("/v1", router);
+
+    const res = await app.request("/v1/fail");
+    expect(res.status).toBe(500);
+    const body: any = await res.json();
+    expect(body.caught).toBe(true);
+    expect(body.error).toBe("Boom!");
+  });
+});