In Nuxt, how to mutate a Vuex state in one module from the other?

Question

I tried many things mentioned on the portal but nothing seems to work for me so posting here for some work-around.

I have 2 modules within my Nuxtjs application folder store\modules: ModuleA and ModuleB. For some verification in ModuleB I would like to access the state from ModuleA but for some reason, it's failing.

I tried rootScope, import etc but it did not work for me.

My state/modules/ModuleA.js:

export const state = () => ({
  eventType: 'MyEvent',
})

export const mutations = {
  eventTypePopulator (state, event) {
    state.eventType = event
  },
}

My state/modules/ModuleB.js:

export const state = () => ({
  input: {}
})

export const mutations = {
  jsonPreparation ({state, rootState}, payload) {
    console.log(rootState.eventType)
    // console.log($store.state.ModuleA.eventType)
  }
}

I tried to import ModuleA into ModuleB and use it but that also did not work for me. Can someone please help me how can I access the state from one Module in another Module within Nuxtjs/Vuejs

Answer 1

As shown in the API reference, rootState is available in actions and getters.
It did not found any way of using it directly into a mutation.

Meanwhile, this can be achieved by passing it as a param to the mutation like this

ModuleB.js

const mutations = {
  NICE_TASTY_MUTATION: (_state, { rootState, payload }) => {
    // _state is not used here because it's moduleB's local state
    rootState['moduleA'].eventType = payload
  },
}

const actions = {
  async myCoolAction({ commit, rootState }, { ...}) {
    commit('NICE_TASTY_MUTATION', {
      rootState,
      payload: 'some-stuff'
    })
  }
}

And this could be called in a .vue file with something like this

methods: {
  ...mapActions('ModuleB', ['myCoolAction']),
}

...
await this.myCoolAction()

---

PS: IMO the convention is more to name the file module_b.js.