element-plus/packages/hooks/use-modal/index.ts

import { watch } from 'vue'
import { isClient, useEventListener } from '@vueuse/core'
import { EVENT_CODE } from '@element-plus/utils/aria'

import type { Ref } from 'vue'

type ModalInstance = {
  handleClose: () => void
}

const modalStack: ModalInstance[] = []

const closeModal = (e: KeyboardEvent) => {
  if (modalStack.length === 0) return
  if (e.code === EVENT_CODE.esc) {
    e.stopPropagation()
    const topModal = modalStack[modalStack.length - 1]
    topModal.handleClose()
  }
}

export const useModal = (instance: ModalInstance, visibleRef: Ref<boolean>) => {
  watch(visibleRef, (val) => {
    if (val) {
      modalStack.push(instance)
    } else {
      modalStack.splice(
        modalStack.findIndex((modal) => modal === instance),
        1
      )
    }
  })
}

if (isClient) useEventListener(document, 'keydown', closeModal)