Checkpoint

Callback fired when the user activates the current checkpoint action (e.g. clicks "Restore Checkpoint" or "Redo"). The payload always mirrors the state prop's value at the time of activation.

The current lifecycle state of the checkpoint, driving the default built-in action rendered in the checkpoint content area. When omitted, no default action is rendered.

A custom component that replaces the default per-state action entirely when supplied — e.g. a timestamp, version label, author, or restore-confirmation/failure content.

When true, the checkpoint strip is always visible. When false or omitted, the strip is only revealed on hover.