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/* eslint-disable function-paren-newline */
/* eslint-disable implicit-arrow-linebreak */
import i18n, { InitOptions } from 'i18next'
import LanguageDetector from 'i18next-browser-languagedetector'
import Backend from 'i18next-http-backend'
import intersection from 'lodash/intersection.js'
import merge from 'lodash/merge.js'
import { initReactI18next } from 'react-i18next'
import { defaultConfig, DEFAULT_NS, Locale, locales } from '../../locale/index.js'
import { flat } from '../../utils/flat/index.js'
/**
Initializes i18n translations based on provided configuration.
@function
@param {Locale} config - The configuration object for initializing i18n
@returns {{i18n: i18next}} - An object containing an i18n instance.
*/
const initTranslations = (config: Locale) => {
const {
language = 'en',
availableLanguages = [],
translations,
localeDetection = false,
withBackend = false,
...i18nConfig
} = config
const combinedConfig: InitOptions = merge(defaultConfig, i18nConfig, {
supportedLngs: availableLanguages,
fallbackLng: i18nConfig.fallbackLng || language,
})
const instance = i18n.createInstance(combinedConfig)
if (!instance.isInitialized) {
if (localeDetection) {
instance.use(LanguageDetector as any)
}
if (withBackend) {
instance.use(Backend)
}
instance.use(initReactI18next).init(combinedConfig)
}
const buildInTranslations = intersection(Object.keys(locales), availableLanguages)
if (buildInTranslations.length) {
buildInTranslations.forEach((lang) =>
instance.addResourceBundle(lang, DEFAULT_NS, flat.flatten(locales[lang])),
)
}
if (translations) {
Object.keys(translations).forEach((lang) =>
instance.addResourceBundle(lang, DEFAULT_NS, flat.flatten(translations[lang]), true, true),
)
}
return { i18n: instance }
}
export default initTranslations
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