사소한 리팩토링

test/setup/polyfills.ts

@@ -0,0 +1,13 @@
+// Node.js 22 doesn't support base64 conversion of Uint8Array yet (latest Chromium does)
+
+if (!Uint8Array.prototype.toBase64) {
+  Uint8Array.prototype.toBase64 = function () {
+    return Buffer.from(this.buffer, this.byteOffset, this.byteLength).toString("base64");
+  };
+}
+
+if (!Uint8Array.fromBase64) {
+  Uint8Array.fromBase64 = (data: string) => {
+    return new Uint8Array(Buffer.from(data, "base64"));
+  };
+}