Socket Emit not working using Vue

I don't know what is my problem here, I followed very well the instruction from npm download, but after all, this emit method is not working.

Here's my code in my Main.vue, I did not include all the functions, but focus on this.

sockets: {
    connect() {
        console.log('socket connected')
    },
    getAllOnline(token) {
        console.log(`Your toke is ${token}`)
    }
},
created() {
    this.$emit('getAllOnline', '123213')
}

I'm expecting to console what ever will be written in getAllOnline() function. But only connect() function of socket object was triggered.

Here's my main.js

// require some files
require('./assets/css/reset.css')
require('./assets/css/common.css')

// The Vue build version to load with the `import` command
// (runtime-only or standalone) has been set in webpack.base.conf with an alias.
import Vue from 'vue'
import axios from 'axios'
import VueAxios from 'vue-axios'
import VueRouter from 'vue-router'
import VueSocketio from 'vue-socket.io';

// Files import
import Main from './components/Main'
import Auth from './components/Auth'
import Register from './components/Register'

// Config of Vue
Vue.config.productionTip = false
Vue.config.devtools = true

// Config of Axios
axios.defaults.headers.post['Content-Type'] = 'application/x-www-form-urlencoded'

// Register to vue
Vue.use(VueRouter)
Vue.use(VueAxios, axios)
Vue.use(VueSocketio, 'http://localhost:8080/');

// API URL
const apiUrl = 'http://localhost/vue-dev/first-app/src/api/'

// Router
const router = new VueRouter({
    mode: 'history',
    base: __dirname,
    routes: [
        {
            path: '/',
            props: {
                apiUrl: apiUrl
            },
            component: Main
        },
        {
            path: '/auth',
            props: {
                apiUrl: apiUrl
            },
            component: Auth
        },
        {
            path: '/register',
            props: {
                apiUrl: apiUrl
            },
            component: Register
        }
    ]
})

// Check if the route is exist on the routes
router.beforeEach((to, from, next) => {
    if(to.matched.length === 0) {
        return router.push('/auth')
    }
    return next()
})

/* eslint-disable no-new */
new Vue({
    el: '#app',
    router,
    template: '<router-view></router-view>'
})

via John Rey M. Baylen