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You can define prototype in router/index.js right under the declaration “Vue.prototype.$router = router;” this will make the instance available in any component.
const router = new NSVueRouter({
//ignoreSame, // <-- Optional. Will set if reject or accept navigate to same current component.
routes,
/* eslint-disable-next-line no-undef */
//verbose: TNS_ENV !== 'production' // <-- Optional. Will output the warnings to console.
})
Vue.prototype.$router = router;
Source:stackexchange.com