Vue2

Global Register

import Vue from "vue";
import LazyComponent from "v-lazy-component/vue2";

Vue.use(LazyComponent);

Local Register

import LazyComponent from "v-lazy-component/vue2";

export default {
  components: {
    LazyComponent
  }
}

Via CDN

<script src="https://unpkg.com/vue@2"></script>
<script src="https://unpkg.com/v-lazy-component/vue2"></script>

<script>
new  Vue({
  el: "#app"
});

Vue.use(LazyComponent);
</script>