Execute DateFormat.format on compute throws LocaleDataException.

[keisuke-kiriyama]

Executing DateFormat.format on compute throws a LocaleDataException, is this expected behavior?

repro code

Future<void> main() async {
  await initializeDateFormatting('ja_JP');
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(),
    );
  }


class MyHomePage extends StatelessWidget {
  const MyHomePage({super.key});

  static final DateFormat _formatter = DateFormat.yMd('ja');

  void _convert(String date) {
    print(_formatter.parse(date));
  }

  Future<void> _compute() async {
    // _convert('2022/01/01 00:00'); <- work correctly
    compute(_convert, '2022/01/01 00:00'); <- throw LocaleDataException
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('compute'),
      ),
      body: Center(child: Text('compute test')),
      floatingActionButton: FloatingActionButton(
        onPressed: _compute,
        child: const Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }

% flutter --version
Flutter 3.3.4 • channel stable • https://github.com/flutter/flutter.git
Framework • revision eb6d86ee27 (6 weeks ago) • 2022-10-04 22:31:45 -0700
Engine • revision c08d7d5efc
Tools • Dart 2.18.2 • DevTools 2.15.0

intl: ^0.17.0