element-plus/packages/element-plus/make-installer.ts

import { watch, unref } from 'vue'
import { provideGlobalConfig } from '@element-plus/hooks'
import { isNumber } from '@element-plus/utils/util'
import { PopupManager } from '@element-plus/utils/popup-manager'
import { version } from './version'
import type { App, Plugin } from 'vue'
import type { ConfigProviderContext } from '@element-plus/tokens'

const INSTALLED_KEY = Symbol('INSTALLED_KEY')

export const makeInstaller = (components: Plugin[] = []) => {
  const install = (app: App, options: ConfigProviderContext = {}) => {
    if (app[INSTALLED_KEY]) return

    app[INSTALLED_KEY] = true
    components.forEach((c) => app.use(c))
    provideGlobalConfig(options, app)

    watch(
      () => unref(options).zIndex,
      () => {
        const zIndex = unref(options).zIndex
        if (isNumber(zIndex)) PopupManager.globalInitialZIndex = zIndex
      },
      { immediate: true }
    )
  }

  return {
    version,
    install,
  }
}