Function getReportsRetention

getReportsRetention(
    this: API,
    websiteId: string,
    parameters: ReportType & Filters & Timestamps & { timezone: string },
): Promise<
    {
        date: Date;
        day: number;
        percentage: number;
        returnVisitors: number;
        visitors: number;
    }[],
>
Measure your website stickiness by tracking how often users return: https://umami.is/docs/api/reports-api#post-apireportsretention (TODO UNTESTED)
Parameters
- this: API
- websiteId: string
- parameters: ReportType & Filters & Timestamps & { timezone: string }
  - timezone: string
    Timezone (ex. America/Los_Angeles)
Returns Promise<
    {
        date: Date;
        day: number;
        percentage: number;
        returnVisitors: number;
        visitors: number;
    }[],
>
- Defined in lib/namespaces/Reports.ts:141