How to use DateFNS in CodePen? (dateFns is not defined)

Question

I need to use the DateFNS in a CodePen but can't get it to work. Error:

"[Vue warn]: Error in data(): 'ReferenceError: dateFns is not defined' (found in < Root>)"

Here is my example CodePen: https://codepen.io/anon/pen/eKqxmd

    <div id="app">
  <v-app id="inspire">
    <v-layout>
      <v-flex xs12 sm6 offset-sm3>
        <v-card>
          <v-card-title primary-title>
            <div>
              <h3 class="headline mb-0">DATE {{ todaysDateMin }}</h3>
            </div>
          </v-card-title>
        </v-card>
      </v-flex>
    </v-layout>
  </v-app>
</div>

    import { format } from 'date-fns'
new Vue({
  el: '#app',
  data () {
    return {    
      todaysDateMin: dateFns.format(new Date(), '[Today is a] dddd')
    }
  }
})

Answer 1

In CodePen go to Settings -> JavaScript and in the External Resource search type date-fns and select from the dropdown list.

Then to call it you need to append dateFns., just like you are already doing.

dateFns.format(new Date(), '[Today is a] dddd')

And remove the import statement