CheckpointState

Represents the current state of a Checkpoint.

• 'startOver' — marks the start of a conversation; the user can restore to the beginning of the conversation.
• 'restore' — the checkpoint marks a point the user can restore to.
• 'redo' — the checkpoint has been restored and a redo action is available.

Checkpoint renders a built-in default action for each of these states ('startOver' renders a "Start Over" button, 'restore' renders a "Restore Checkpoint" button; 'redo' renders a restored-state stamp followed by a "Redo" button). The template prop, when supplied, replaces that default action entirely.