Description
What problem does this feature solve?
So far (computed) properties bound with mapState Vuex Component Binding Helper will be displayed as "vuex bindings" in the component inspector.
The helper exports a function with a property named vuex. In the devtools this property is checked for all computed properties (see here).
However, it is not possible to mark a (computed) property as "vuex bindings", if a custom userland wrapper (as supposed here) does not return a function.
This especially conflicts if the property has a computed setter and thereby is an object (see also).
This would make it possible to show another developer that a property is actually bound to the vuex state in one's app.
What does the proposed API look like?
The internal API only needs to check if the property is a "function" or an "object" in https://github.com/vuejs/vue-devtools/blob/dev/src/backend/index.js#L714.
One side-effect is that even in the component itself a property could be marked as "vuex binding". One could also want this, following the Form Two Way Binding example.