move this section to app.js

 // 
 const routes=[
     {
        path:"/foo",
        name:"foo",
        component: Vue.component( 'foo', require( './pages/foo.vue' ))
    },
    {
        path:"/bar",
        name:"bar",
        component: Vue.component( 'bar', require( './pages/bar.vue' ))
    }
 ];

change to

 // 
 const routes=[
     {
        path:"/foo",
        name:"foo",
        component: require( './pages/foo.vue' ).default
    },
    {
        path:"/bar",
        name:"bar",
        component: require( './pages/bar.vue' ).default
    }