what is replacement for textTheme in flutter. I'm getting following error

I'm new to flutter getting this error. can anyone please help with this? trying to and text styles.

import 'package:flutter/material.dart';
import 'screens/location_detail/location_detail.dart';
import 'style.dart';


class App extends StatelessWidget{

  @override
  Widget build(BuildContext context) {
   return MaterialApp(
     home:LocationDetail(),
     theme:ThemeData(
       appBarTheme: AppBarTheme(
         textTheme: TextTheme(title: AppBarTextStyle)
       )
     )
   );
  }
}

Solution 1:

You can use toolBarTextStyle and titleTextStyle instead of textTheme. For more details please refer below link textTheme

Solution 2:

You can use titleTextStyle like this:

appBarTheme: AppBarTheme(
     titleTextStyle: TextStyle(color: Colors.blue)
)

appBar: AppBar(
    title: Text(
      ' ',
      style: Theme.of(context).appBarTheme.titleTextStyle,
    ),