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Initialize with Script Tags (ESM)

Use FullCalendar as an ES module within a <script> tag, preferably with import maps. Example:

<!DOCTYPE html>
<html>
  <head>
    <script type='importmap'>
      {
        "imports": {
          "@fullcalendar/core": "https://cdn.skypack.dev/@fullcalendar/core@6.1.1",
          "@fullcalendar/daygrid": "https://cdn.skypack.dev/@fullcalendar/daygrid@6.1.1"
        }
      }
    </script>
    <script type='module'>
      import { Calendar } from '@fullcalendar/core'
      import dayGridPlugin from '@fullcalendar/daygrid'

      document.addEventListener('DOMContentLoaded', function() {
        const calendarEl = document.getElementById('calendar')
        const calendar = new Calendar(calendarEl, {
          plugins: [dayGridPlugin],
          headerToolbar: {
            left: 'prev,next today',
            center: 'title',
            right: 'dayGridMonth,timeGridWeek,timeGridDay,listWeek'
          }
        })
        calendar.render()
      })
    </script>
  </head>
  <body>
    <div id='calendar'></div>
  </body>
</html>