如何在Dart中将base64字符串url解码或转换为UintList？

import 'dart:convert';

void main() {
  String base64Url = 'SGVsbG8gd29ybGQh'; // 示例base64字符串URL

  Uint8List decodedData = base64UrlToUint8List(base64Url);
  print(decodedData);
}

Uint8List base64UrlToUint8List(String base64Url) {
  String base64String = base64Url.replaceAll('-', '+').replaceAll('_', '/');

  while (base64String.length % 4 != 0) {
    base64String += '=';
  }

  List<int> decodedBytes = base64UrlSafe.decode(base64String);
  return Uint8List.fromList(decodedBytes);
}

import 'dart:convert';
import 'dart:typed_data';