thanks for the interest in the timeline-chart library. I hope this library fits the needs of your project.
Unfortunately there has been no real documentation available. I took your question as opportunity to provide some documentation for the project. Please see this pull request.
The library is still under development and more features, improvements and fixes are currently being implemented.
The good news is, that the library is heavily used in the theia-trace-extension project. This project uses React.js in conjunction with the timeline-chart library. Many features and updates are triggered trough that project. I suggest that you checkout this project and how the library is used there.
If you have any suggestions, feedback or features please use the Github issue trackers to get involved in the project.