Cannot read property 'config' of undefined

I used before version 8.12.0 today, I update new version 8.15.1 I use vue-i18n-loader 0.4.1

this error in browser

Uncaught (in promise) TypeError: Cannot read property 'config' of undefined
    at VueI18n._initVM (vue-i18n.esm.js?d8f9:1183)
    at new VueI18n (vue-i18n.esm.js?d8f9:1122)

in this code

VueI18n.prototype._initVM = function _initVM (data) {
    var silent = Vue.config.silent;  // excuted error at this line, Vue is `undefined`
    Vue.config.silent = true;
    this._vm = new Vue({ data: data });
    Vue.config.silent = silent;
  };

how reolve this problem?

[ssikoron]

I had the same issue - turned out I forgot to call Vue.use(VueI18n) before creating the i18n instance.

Here’s the code which works for me with 8.15.1:

import Vue from "vue";
import VueI18n from "vue-i18n";

Vue.use(VueI18n);

const i18n = new VueI18n({
  locale: "en",
  { ... }
});

new Vue({
  i18n,
  router,
  store,
  render: h => h(App)
}).$mount("#app");

[jbnv]

Why is the instance dependent on the Vue variable? I’m trying to use a local instance of VueI18n to do translations within only one particular module. Shoehorning everything into a global instance of VueI18n is a major problem for my project.