Global variable vuejs

How to create a global variable in vue

// in main =.js
Vue.prototype.$appName = 'My App'

////in components 
 console.log(this.$appName)

Global variable vuejs

import Axios from 'axios'

// set global axios like this
Vue.prototype.$axios = Axios;

// call axios like this
this.$axios.get('https://jsonplaceholder.typicode.com/todos/1')

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