function mount()

in packages/vue/vue-portal/src/singleSpaVue.ts [41:89]
39 lines of code
11 McCabe index (conditional complexity)

function mount(opts, mountedInstances, props) {
  return Promise
    .resolve()
    .then(() => {
      const appOptions = {...opts.appOptions}
      if (props.domElement && !appOptions.el) {
        const div = document.createElement('div');
        props.domElement.appendChild(div);
        appOptions.el = div
      }

      if (!appOptions.el) {
        const htmlId = `single-spa-application:${props.name}`
        appOptions.el = `#${htmlId.replace(':', '\\:')} .single-spa-container`
        let domEl = document.getElementById(htmlId)
        if (!domEl) {
          domEl = document.createElement('div')
          domEl.id = htmlId
          document.body.appendChild(domEl)
        }

        // single-spa-vue@>=2 always REPLACES the `el` instead of appending to it.
        // We want domEl to stick around and not be replaced. So we tell Vue to mount
        // into a container div inside of the main domEl
        if (!domEl.querySelector('.single-spa-container')) {
          const singleSpaContainer = document.createElement('div')
          singleSpaContainer.className = 'single-spa-container'
          domEl.appendChild(singleSpaContainer)
        }

        mountedInstances.domEl = domEl
      }

      if (!appOptions.render && !appOptions.template && opts.rootComponent) {
        appOptions.render = (h) => h(opts.rootComponent)
      }

      if (!appOptions.data) {
        appOptions.data = {}
      }

      appOptions.data = {...appOptions.data, ...props}

      mountedInstances.instance = new Vue(appOptions);
      if (mountedInstances.instance.bind) {
        mountedInstances.instance = mountedInstances.instance.bind(mountedInstances.instance);
      }
    })
}