[Vuejs]-Vuejs 3 composition api getCurrentInstance($refs)

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As getCurrentInstance should normally not been used, you should follow the Template Refs guide.

<!—- inside the template —->
<my-modal ref="modalLoading" />

// your component
export default defineComponent({
  setup() {
    const modalLoading = ref(null);

    const handleSubmit = () => {
      If(!modalLoading.value) return;
      modalLoading.value.openModal();
    }

    return { modalLoading };

  }
})

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