parsley/app/javascript/lib/GlobalMixins.js

import Vue from 'vue';
import { mapGetters, mapMutations, mapState } from 'vuex';

Vue.mixin({
  computed: {
    ...mapGetters([
      "isLoading",
      "isLoggedIn",
      "isAdmin"
    ]),
    ...mapState([
      "user"
    ])
  },
  methods: {
    ...mapMutations([
      'setError',
      'setLoading'
    ]),

    loadResource(promise) {
      this.setLoading(true);

      return promise
        .catch(err => this.setError(err))
        .then(() => this.setLoading(false));
    }
  }
});