// create a HealthFactory for use in the app
  HealthFactory health = HealthFactory();

  // define the types to get
  var types = [
    HealthDataType.STEPS,
    HealthDataType.BLOOD_GLUCOSE,
  ];

  // requesting access to the data types before reading them
  bool requested = await health.requestAuthorization(types);

  var now = DateTime.now();

  // fetch health data from the last 24 hours
  List<HealthDataPoint> healthData = await health.getHealthDataFromTypes(
     now.subtract(Duration(days: 1)), now, types);

  // request permissions to write steps and blood glucose
  types = [HealthDataType.STEPS, HealthDataType.BLOOD_GLUCOSE];
  var permissions = [
      HealthDataAccess.READ_WRITE,
      HealthDataAccess.READ_WRITE
  ];
  await health.requestAuthorization(types, permissions: permissions);

  // write steps and blood glucose
  bool success = await health.writeHealthData(10, HealthDataType.STEPS, now, now);
  success = await health.writeHealthData(3.1, HealthDataType.BLOOD_GLUCOSE, now, now);

  // get the number of steps for today
  var midnight = DateTime(now.year, now.month, now.day);
  int? steps = await health.getTotalStepsInInterval(midnight, now);

HealthValue value; // NumericHealthValue, AudiogramHealthValue, WorkoutHealthValue
HealthDataType type;
HealthDataUnit unit;
DateTime dateFrom;
DateTime dateTo;
PlatformType platform;
String uuid, deviceId;
String sourceId;
String sourceName;

HealthDataPoint p1 = ...;
HealthDataPoint p2 = ...;
bool same = p1 == p2;

List<HealthDataPoint> points = ...;
points = Health.removeDuplicates(points);