add roleBytes utility for contract role usage

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

@@ -0,0 +1,10 @@
+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

@@ -0,0 +1,14 @@
+import { keccak256 } from "../../hashing/keccak256.js";
+import { toBytes } from "../to-bytes.js";
+
+/**
+ * Generates a 256-bit hash of a given role string in bytes form using the keccak256 algorithm.
+ *
+ * @param {string} role - The role string to be converted into bytes and hashed.
+ * @returns {`0x${string}`} A 256-bit hash of the input role as a byte array.
+ * @example
+ *   const AdminRole = roleBytes("ADMIN_ROLE");
+ */
+export const roleBytes = (role: string): `0x${string}` => {
+  return keccak256(toBytes(role));
+};