<template>
    ...
        <span v-if="total > 0" class="badge">{{ total }}</span>
    ...
</template>
<script>
    import { mapGetters } from 'vuex'
    export default {
        mounted() {
            this.initialMount()
        },
        computed: {
            ...mapGetters(['total'])
        },
        methods: {
            initialMount() {
                Echo.private('App.User.' + window.Laravel.authUser.id).notification((notification) => {
                    ...
                })
            },
        }
    }
</script>