cally/calendar-integration/microsoft-calendar-utils.js

export async function fetchMicrosoftCalendarEvents(token, startDate, endDate) {
  const response = await fetch(
    `https://graph.microsoft.com/v1.0/me/calendar/calendarView?startDateTime=${startDate}&endDateTime=${endDate}`,
    {
      headers: {
        Authorization: `Bearer ${token}`,
      },
    },
  );

  const data = await response.json();

  const microsoftEvents = [];
  data?.value?.forEach((item) => {
    const start = item.start;
    let startDateTime;
    if (start !== undefined) {
      const stringDate = start.dateTime;
      startDateTime = new Date(stringDate);
    }

    const end = item.end;
    let endDateTime;
    if (end !== undefined) {
      const stringDate = end.dateTime;
      endDateTime = new Date(stringDate);
    }

    const microsoftEvent = {
      id: item.uid,
      title: item.subject,
      startDate: startDateTime,
      endDate: endDateTime,
      allDay: item.isAllDay,
    };
    microsoftEvents.push(microsoftEvent);
  });

  return microsoftEvents;
}