when using vue-i18n, force langauge in typescript

index.ts
import Vue from 'vue';
import VueI18n from 'vue-i18n';

// Import translation messages
import messages from '@/i18n';

// Create new instance of VueI18n using the language you want to force.
const i18n = new VueI18n({
  // fallback language
  fallbackLocale: 'en',
  // language you want to force
  locale: 'fr',
  messages,
});

new Vue({
  i18n,
  // ... rest of your Vue app
}).$mount('#app');
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