Error: The argument type 'String?' can't be assigned to the parameter type 'Object' because 'String?' is nullable and 'Object' isn't. in final parsed = css.parse(text);

[zhangjingfang7]

at class universal_html-2.2.4/lib/src/html/dom/element_subclasses.dart in 2757 rows exist problem：
final text = this.text;
final parsed = css.parse(text as String);

Error: The argument type 'String?' can't be assigned to the parameter type 'Object' because 'String?' is
nullable and 'Object' isn't.

• 'Object' is from 'dart:core'.
  final parsed = css.parse(text);
  ^
  Target kernel_snapshot failed: Exception

need to cover