Gridsome Full Calendar build error - no SSR - vue.js

Question

I'm trying to use the Full Calendar vue component (https://github.com/fullcalendar/fullcalendar-vue) in a Gridsome project like so:
<template>
<div class="tabStaffManage">
<div>
<FullCalendar
ref="staffCalendar"
class="fullCalendar"
defaultView="dayGridMonth"
:events="calendarEvents"
:plugins="calendarPlugins"
:allDaySlot="false"
:header="{
center: 'dayGridMonth, timeGridDay',
right: 'prev, next'
}"
minTime="09:00:00"
:selectable="true"
maxTime="18:30:00"
#eventClick="onEventClick"
#select="onDateSelect"
:showNonCurrentDates="false"
></FullCalendar>
</div>
</div>
</template>
<script>
import { formatDate } from "#fullcalendar/core"
import FullCalendar from "#fullcalendar/vue"
import timeGridPlugin from "#fullcalendar/timegrid"
import dayGridPlugin from "#fullcalendar/daygrid"
import interactionPlugin from "#fullcalendar/interaction"
export default {
components: {
FullCalendar,
},
data() {
return {
calendarPlugins: [dayGridPlugin, timeGridPlugin, interactionPlugin],
}
},
}
</script>
This, however, produces an error on build:
Could not generate HTML for "/staff/dashboard/":
ReferenceError: Element is not defined
at Object.338 (node_modules/#fullcalendar/core/main.esm.js:102:0)
at __webpack_require__ (webpack/bootstrap:25:0)
at Module.552 (assets/js/page--src-pages-staff-dashboard-vue.ea5234e7.js:598:16)
at __webpack_require__ (webpack/bootstrap:25:0)
I understand that Full Calendar does not support SSR. So as per the Gridsome documentation (https://gridsome.org/docs/assets-scripts/#without-ssr-support) I did this to import the component:
I created an alias for it's dependencies in gridsome.config.js like so:
var path = require('path');
api.configureWebpack({
resolve: {
alias: {
"timeGridPlugin": path.resolve('node_modules', '#fullcalendar/timegrid'),
etc....
}
},
})
and required those plugins in the mounted() lifecycle hook:
mounted() {
if (!process.isClient) return
let timeGridPlugin = require('timeGridPlugin')
...
},
components: {
FullCalendar: () =>
import ('#fullcalendar/vue')
.then(m => m.FullCalendar)
.catch(),
}
I then wrapped the FullCalendar component in:
<ClientOnly>
<FullCalendar></FullCalendar>
</ClientOnly>
The extra dependencies required in the mounted() hook are included no problem.
However I now get the following error:
TypeError: Cannot read property '__esModule' of undefined
It seems that components() is failing to import the '#fullcalendar/vue' component.
Am I doing something wrong when importing the '#fullcalendar/vue' component?
Is there another way to include both the '#fullcalendar/vue' component and the plugin dependencies with no SSR?

Answer 1

Requiring the full calendar vue component in main.js by checking the gridsome client API and registering the component globally in vue seems to work and does what I expected:
// Include no SSR
if (process.isClient) {
const FullCalendar = require("#fullcalendar/vue").default
Vue.component("full-calendar", FullCalendar)
}
I also was not pointing to the default object when requiring the other modules in the component:
mounted() {
if (!process.isClient) return
let timeGridPlugin = require('timeGridPlugin').default
...
}