Pass state property via props (Vuex)
Note the comment in the mapState example:
// to access local state with `this`, a normal function must be usedcountPlusLocalState (state) { return state.count + this.localCount}
You are using arrow functions.
As for this.module, I think you're going to have to forego the binding helper notation and explicitly put the module reference into the definitions. I'm guessing that looks like:
computed: mapState(this.module, { title(state) { return get(`${state}.${this.module}`, `${this.section}.title`); }, message(state) { return get(`${state}.${this.module}`, `${this.section}.message`); }})