Download file in dart

main.dart

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

void main() {
  final content = '["general kenobi", "you are a bold one"]';
  download('message.json', utf8.encode(content) as Uint8List, type: 'application/json');
}

void download(String filename, Uint8List data, {String type = 'octet/stream'}) {
  final blob = Blob([data], type);
  final url = Url.createObjectUrlFromBlob(blob);
  
  final a = AnchorElement()
    ..style.display = 'none'
    ..href = url
    ..download = filename;
  
  document.body.append(a);
  
  a.click();
  Url.revokeObjectUrl(url);
  
  a.remove();
}