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Babel is required to process package imports. If you need a different preprocessor remove all packages first.

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Flutter

              
                import 'package:flutter/material.dart';

void main() {
  runApp(
    MaterialApp(
      home: MyWidget(),
    ),
  );
}

class MyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Text(
          'Build some widgets!',
          style: Theme.of(context).textTheme.headline4,
        ),
      ),
    );
  }
}

              
            
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