Webpack import('./components/Err.vue') fail

[buzzzzer]

main.ts

// its works ! 
import Err from '@/components/Err.vue';  

// instead of the line above fail
const Err = () => import('./components/Err.vue'); 

.....
.....

Err.vue with import Err from '@/components/Err.vue';

Err.vue with const Err = () => import('./components/Err.vue'); // fail