Currently, I am working on setting up jest unit tests for a Vue project within a complex custom monorepo. I am facing an issue with i18n, which I use for translation management in my application.
The problem arises with the following code snippet for initializing i18n:
import Vue from "vue"
import VueI18n from "vue-i18n"
import { getTranslations, addMissingKey, getLocaleFromBrowser, SUPPORTED_LOCALE } from "./api"
import { dateTimeFormats } from "./formats"
Vue.use(VueI18n)
export const defaultLocale = getLocaleFromBrowser()
const i18n = new VueI18n({
locale: defaultLocale,
dateTimeFormats,
missing: (_locale: string, key: string) => {
addMissingKey(key, false)
},
fallbackLocale: SUPPORTED_LOCALE.EN,
})
export default i18n
const loadTranslations = async (locale: SUPPORTED_LOCALE) => {
i18n.mergeLocaleMessage(
locale,
await getTranslations(locale),
)
}
export const changeLocale = async (locale: SUPPORTED_LOCALE) => {
if (i18n.locale === locale) {
return
}
await loadTranslations(locale)
i18n.locale = locale
document.getElementsByTagName("html")[0].lang = locale
}
During the test execution, the following error occurs:
Test suite failed to run
TypeError: Cannot read property 'use' of undefined
14 | locale: defaultLocale,
15 | dateTimeFormats,
> 16 | missing: (_locale: string, key: string) => {
| ^
17 | addMissingKey(key, false)
18 | },
19 | fallbackLocale: SUPPORTED_LOCALE.EN,
It appears that 'vue' is undefined for an unknown reason. I may be overlooking something, but how can I mock this to prevent this error from occurring?
Any guidance on this issue would be greatly appreciated. Thank you.