Where did the state go?

Question

Vue.js

export default {
    token:  '',
    user:   {
        id:                  null,
        team:{
            name: '',
            members: [],
        },
    },

// loading data before component rendered!
        beforeMount () {
            console.log(`beforeMount - this`, this);
            console.log(`beforeMount - this.user`, this.user);
            console.log(`beforeMount - this.user.team`, this.user.team);
            console.log(`beforeMount - this.user.team.members`, this.user.team.members);
        },
        // loading data before component rendered!

        created () {
            console.log(`created - this`, this);
            console.log(`created - this.user`, this.user);
            console.log(`created - this.user.team`, this.user.team);

created - this VueComponent {_uid: 95, _isVue: true, $options: {…}, _renderProxy: Proxy, _self: VueComponent, …}
created - this.user {…}
created - this.user.team null

beforeMount - this VueComponent {_uid: 95, _isVue: true, $options: {…}, _renderProxy: Proxy, _self: VueComponent, …}
beforeMount - this.user {…}
beforeMount - this.user.team null

that leads to

TypeError: Cannot read property 'members' of null
    at VueComponent.created (team-profile.vue?97bf:124)
    at invokeWithErrorHandling (vue.runtime.esm.js?2b0e:1854)
    at callHook (vue.runtime.esm.js?2b0e:4219)
    at VueComponent.Vue._init (vue.runtime.esm.js?2b0e:5008)
    at new VueComponent (vue.runtime.esm.js?2b0e:5154)
    at createComponentInstanceForVnode (vue.runtime.esm.js?2b0e:3283)
    at init (vue.runtime.esm.js?2b0e:3114)
    at merged (vue.runtime.esm.js?2b0e:3301)
    at createComponent (vue.runtime.esm.js?2b0e:5978)
    at createElm (vue.runtime.esm.js?2b0e:5925)

computed:   {

            ...mapGetters(
                SESSION,
                {
                    user: `getSessionUser`,
                }
            ),

        },

getSessionUser (state) {
        return state.user;
    },

Answer 1

It seems like data() should return a state