flutter-samples/stream_chat_v1/lib/stream_version.dart

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:yaml/yaml.dart';
import 'package:stream_chat_flutter/stream_chat_flutter.dart';

class StreamVersion extends StatelessWidget {
  const StreamVersion({
    Key key,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Container(
      padding: const EdgeInsets.symmetric(vertical: 16),
      alignment: Alignment.bottomCenter,
      child: FutureBuilder<String>(
        future: rootBundle.loadString('pubspec.lock'),
        builder: (context, snapshot) {
          if (!snapshot.hasData) {
            return SizedBox();
          }

          final pubspec = snapshot.data;
          final yaml = loadYaml(pubspec);
          final streamChatDep =
              yaml['packages']['stream_chat_flutter']['version'];

          return Text(
            'Stream SDK v ${streamChatDep}',
            style: TextStyle(
              fontSize: 14,
              color: StreamChatTheme.of(context).colorTheme.greyGainsboro,
            ),
          );
        },
      ),
    );
  }
}