I can't figure out how to set a variable like in vuex, vue-router?

Question

Vue.js

hello!) why doesn't setting the global vue variable work for me?

on the example of vuex, when initializing vue, I put the variable myVariable in the option

const myVariable = { //... }
new Vue({
  myVariable,
  store,
  render: h => h(App)
}).$mount('#app')

and in components this.myVariableand this.$myVariableare equal , of undefined

course, I understand that it’s not so simple, I went to parse the code, they just export the class, I also passed the class and nothing, I can’t figure out how

much more, why then vuex also uses Vue.useto install the plugin, if in the plugin, as I understand it, you can also set a global variable.

Answer 1

This is not how it works
https://ru.vuejs.org/v2/guide/plugins.html#%D0%A1%...