pinafore/routes/_components/timeline/LazyTimeline.html

<div class="lazy-timeline">
  {{#await importTimeline}}
  {{then constructor}}
    <:Component {constructor} :timeline />
  {{catch error}}
    <div>Component failed to load. Try refreshing! {{error}}</div>
  {{/await}}
</div>
<style>
  .lazy-timeline {
    width: 100%;
    min-height: 60vh;
  }
</style>
<script>
  import { importTimeline } from '../../_utils/asyncModules'
  import { store } from '../../_store/store'
  import { scheduleIdleTask } from '../../_utils/scheduleIdleTask'

  export default {
    oncreate() {
      let instanceName = this.store.get('currentInstance')
      let timeline = this.get('timeline')
      this.store.set({currentTimeline: timeline})
      this.store.setForTimeline(instanceName, timeline, {runningUpdate: false})
    },
    store: () => store,
    data: () => ({
      importTimeline: importTimeline().then(timeline => {
        return new Promise((resolve) => {
          // make column-switching more responsive by delaying this load
          scheduleIdleTask(() => resolve(timeline))
        })
      })
    })
  }
</script>