[Vuejs]-DHX Scheduler undefined

To use dhtmlx-scheduler with TypeScript, make sure to import dhtmlx-scheduler in addition to the SchedulerStatic type:

import 'dhtmlx-scheduler'
import { SchedulerStatic } from 'dhtmlx-scheduler'

Then you could use window.scheduler like this:

const scheduler: SchedulerStatic = (window as any).scheduler
scheduler.init(/*...*)

Example of TypeScript SFC based on docs:

<template>
  <div ref="scheduler"></div>
</template>

<script lang="ts">
import { defineComponent } from 'vue'
import 'dhtmlx-scheduler'
import { SchedulerStatic } from 'dhtmlx-scheduler'

export default defineComponent({
  name: 'scheduler',
  props: {
    events: {
      type: Array,
      default: () => []
    }
  },
  mounted() {
    const scheduler: SchedulerStatic = (window as any).scheduler // eslint-disable-line
    scheduler.skin = 'material'
    scheduler.config.header = [
        'day',
        'week',
        'month',
        'date',
        'prev',
        'today',
        'next'
    ]

    scheduler.init(this.$refs.scheduler as HTMLElement, new Date(2020, 0, 20), 'week')
    scheduler.parse(this.$props.events)
  }
})
</script>

<style>
@import "~dhtmlx-scheduler/codebase/dhtmlxscheduler_material.css";
</style>