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In main.js you need to first import devtools, make it the first import:
import VueDevtools from 'nativescript-vue-devtools'
then, below (doesn’t have to necessarily be the next statement you can position it lower in the file):
if (TNS_ENV !== 'production') {
Vue.use(VueDevtools)
}
It works this way.
Source:stackexchange.com