globalErrorHandler.js

// main.js
Vue.config.errorHandler = function (error) {
  Toast.error(error.message)
  console.warn(error.message)
}

// App.vue
@Component
export default class App extends Vue {
  async created() {
    const data = await api.getData() // throws Error
    // ...
  }
  
  mounted() {
    this.name = this.name.toUpperCase() // throws TypeError
  }
}