Interface SwimLengthJSONInterface

interface SwimLengthJSONInterface {
    avgCadence: number | null;
    avgHeartRate: number | null;
    avgSpeed: number | null;
    calories: number | null;
    distance: number | null;
    elapsedTime: number | null;
    endDate: number;
    index: number;
    lapIndex: number | null;
    maxHeartRate: number | null;
    poolLength: number | null;
    startDate: number;
    stroke: string | null;
    strokes: number | null;
    swolf: number | null;
    timerTime: number | null;
    type: string;
}