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const extension = require('extensionizer')
const promisify = require('pify')
const allLocales = require('../../_locales/index.json')
const existingLocaleCodes = allLocales.map(locale => locale.code.replace('_', '-'))
async function getFirstPreferredLangCode () {
const userPreferredLocaleCodes = await promisify(
extension.i18n.getAcceptLanguages,
{ errorFirst: false }
)()
const firstPreferredLangCode = userPreferredLocaleCodes.find(code => existingLocaleCodes.includes(code))
return firstPreferredLangCode || 'en'
}
module.exports = getFirstPreferredLangCode
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