Using localStorage with Flutter for web

local_storage.dart

@JS()
library storage;

import 'package:js/js.dart';

external Storage get localStorage;

@JS()
class Storage {
  int length;
  external dynamic getItem(String key);
  external void setItem(String key, dynamic item);
  external void removeItem(String key);
  external void clear();
}

main() {
  localStorage.setItem('foo', 'bar');
  print(localStorage.length); // 1
  print(localStorage.getItem('foo')); // 'bar'
  localStorage.removeItem('foo');
  print(localStorage.length); // 0
}