anchor.diff:        analytics_constants.landingScreen,
         analytics_constants.importFile,
       );
  -    final importedFile = await importFileFromPicker(
  +    final DevToolsJsonFile? importedFile = await importFileFromPicker(
         acceptedTypes: ['json'],
       );
  +
       if (importedFile != null) {
         Provider.of<ImportController>(context, listen: false)
             .importData(importedFile);
  
positive.code: 
  class LandingScreenSection extends StatelessWidget {
    const LandingScreenSection({
      Key key,
      @required this.title,
      @required this.child,
    }) : super(key: key);
  
    final String title;
  
negative.code: }
  
  class AppSizeToolingInstructions extends StatelessWidget {
    const AppSizeToolingInstructions({Key? key}) : super(key: key);
  
    @override
    Widget build(BuildContext context) {
  