Upgrade to Vuex3

[rtibbles]

Summary

Vuex3 will allow better and more modular Vuex state management.

[jonboiser]

One thing we can start doing now that won't break anything is move functions in options.vuex.getters to options.computed and options.vuex.actions to options.methods, like in this diff

[rtibbles]

Do we want to have mapGetters as a universal helper function that we can then swap out for the vuex mapGetters function?

[jonboiser]

Yeah, that's why I named them so similarly. It wouldn't be an exact swap though.

pre vuex3

      ...mapGetters({
        isAdmin,
        isCoach,
        classCoaches,
        isSuperuser,
        className,
      }),

vuex 3 (assuming these getters are defined on your store/module

      ...mapGetters([
        'isAdmin',
        'isCoach',
        'classCoaches',
        'isSuperuser',
        'className',
      ]),

[indirectlylit]

@jonboiser please close this issue once your final introduction of modules for page state has been merged