Problem with vue3

[mssayari]

Hi,
Is this compatible with vue3 ?
I tried to use it with vue3 but had some errors then I replaced vue-jalali-moment with vue3-jalali-moment which is a fork from that repo for vue3.
now I have this error: Uncaught (in promise) TypeError: this is null which is referring to

name: 'PersianCalendar',
  props: {
    dateFormat: {
      type: String,

      default() {
        return 'jYYYY/jMM/jDD';
      }

    },
    showDate: {
      type: [Object, String],

      default() {
        return this.$moment();
      }
    },

is there any way to run this on vue3 ?