feat: use Uint8Array.fromBase64 if available

Signed-off-by: Alfi Maulana <alfi.maulana.f@gmail.com>

Author: threeal

lib/index.ts

@@ -23,6 +23,16 @@ export class InvalidTokenError extends Error {}
 InvalidTokenError.prototype.name = "InvalidTokenError";
 
 function b64DecodeUnicode(str: string) {
+  if (
+    typeof Uint8Array !== "undefined" &&
+    "fromBase64" in Uint8Array &&
+    typeof Uint8Array.fromBase64 === "function"
+  ) {
+    // Use native Uint8Array.fromBase64 if available
+    const bytes = Uint8Array.fromBase64(str) as Uint8Array;
+    return new TextDecoder().decode(bytes);
+  }
+
   return decodeURIComponent(
     atob(str).replace(/(.)/g, (m, p) => {
       let code = (p as string).charCodeAt(0).toString(16).toUpperCase();