firt attempt for an ics calendar

helpers/ical.ts

@@ -0,0 +1,20 @@
+import { createEvents } from 'ics'
+import { BookingDocument } from '../db/booking'
+
+export function generateBookedCalendar(bookings: BookingDocument[]) {
+  const events = bookings.map((booking) => ({
+    title: `Buchung ${booking.booker.name}`,
+    description: `UUID: ${booking.uuid}
+Link: http://${process.env.VERCEL_URL}/booking/${booking.uuid}`,
+    start: booking.days[0].split('-'),
+    end: booking.days[booking.days.length - 1].split('-'),
+  }))
+  // ts-ignore
+  const { error, value } = createEvents(events)
+
+  if (error) {
+    throw new Error(error)
+  }
+
+  return value
+}