Migration Guide
If you're coming from earlier versions of Synpress, you're both in and out of luck. Synpress v4 is a complete rewrite of the library, so it's not backward compatible with previous versions. However, the API is much more straightforward and intuitive, so you should be able to migrate your tests easily.
INFO
Once the API of the alpha release is stable, we'll publish a migration guide that should help you migrate your tests from v3 to v4.