What is Timeline.dart used for in dart?

Question

When I reading the code of flutter. I find some code in framework.dart like

Timeline.startSync('Build', arguments: timelineWhitelistArguments);

Timeline.finishSync();

I found the document in this website

https://api.flutter.dev/flutter/dart-developer/Timeline-class.html

But I still don't understand what is the purpose of this class.

Answer 1

It's used to check the app performance on a timeline in Flutter DevTools.

You can read more about it here: Tracing Any Dart Code Performance

EDITED Also found a good article about profiling Flutter apps using timelines at medium. Medium Article