add return type and add test

Author: dirtycajunrice

packages/thirdweb/src/utils/encoding/helpers/role-bytes.test.ts

@@ -0,0 +1,11 @@
+import { describe, expect, it } from "vitest";
+import { roleBytes } from "./role-bytes.js";
+
+describe("roleBytes", () => {
+  it('should calculate the value of lister role', () => {
+    expect(roleBytes("LISTER_ROLE"))
+      .toBe(
+        "0xf94103142c1baabe9ac2b5d1487bf783de9e69cfeea9a72f5c9c94afd7877b8c"
+      );
+  });
+});

packages/thirdweb/src/utils/encoding/helpers/role-bytes.ts

@@ -9,6 +9,6 @@ import { toBytes } from "../to-bytes.js";
  * @example
  *   const AdminRole = roleBytes("ADMIN_ROLE");
  */
-export const roleBytes = (role: string) => {
+export const roleBytes = (role: string): `0x${string}` => {
   return keccak256(toBytes(role));
 }