generate a resolved AST fromString

resolve_ast_from_string.dart

import 'package:analyzer/dart/analysis/analysis_context_collection.dart';
import 'package:analyzer/dart/analysis/results.dart';
import 'package:analyzer/file_system/overlay_file_system.dart';
import 'package:analyzer/file_system/physical_file_system.dart';

final string = '''
class App {
  final String id;
  final String name;

  App(this.id, this.name);
}
''';

// dart run resolve_ast_from_string.dart        (~2097-ms)
// dart run resolve_ast_from_string.dart        (~700-ms)
// dartaotruntime resolve_ast_from_string.aot   (~305-ms)
Future<void> main() async {
  final watch = Stopwatch()..start();
  final filePath = '/it/does/not/matter/file.dart';
  final collection = AnalysisContextCollection(
    includedPaths: [filePath],
    resourceProvider: OverlayResourceProvider(
      PhysicalResourceProvider(),
    )..setOverlay(
        filePath,
        content: string,
        modificationStamp: 0,
      ),
  );

  final analysisSession = collection.contextFor(filePath).currentSession;

  final libraryElement = await analysisSession
      .getLibraryByUri('file://$filePath')
      .then((libraryResult) => (libraryResult as LibraryElementResult).element);

  final clazz = libraryElement.getClass('App');
  print(clazz?.name); // prints App

  watch.stop();
  print('elapsed time ${watch.elapsedMilliseconds}-ms');
}