How to access global. Vue 3 variables?

Question

Vue.js

Hello.
I'm slowly picking vue 3 and even fell into a stupor with the new composition API. How can I access for example $router, $store or other variables? They write on the Internet that the second setup parameter should have a root property, but I don’t have it and the documentation states that there are only 3 keys in this parameter (attrs, emit, slots)
There is an option through getCurrentInstance or import the instance from the plugin, but this kind of crutch

Answer 1

Found the answer in the documentation
https://composition-api.vuejs.org/#plugin-development

Answer 2

That's right. The context parameter must be the root object.
https://stackoverflow.com/a/58579885/7436149
PS I did not pick version 3 myself)