const lookup = {
  course_id: savedCourseId,
  attempt_id: savedAttemptId,
  user: { email: "john@example.com" }
};
const current = await player.getResult(lookup);
const history = await player.getAttemptHistory(lookup);
// { attempt_id, current_generation, history: [...], page: 0, has_more: false }
// Each history entry has generation, completion, success, score, seconds,
// name, format, started_at, updated_at and reset_at.

if (history.history.length) {
  const generation = history.history[0].generation;
  const previous = await player.getResult({ ...lookup, generation });
  const report = player.showReport({ el: "#results", ...lookup, generation });
  await report.ready;
}