43 lines
1.4 KiB
JavaScript
43 lines
1.4 KiB
JavaScript
const extension = require('extensionizer')
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const promisify = require('pify')
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const allLocales = require('../../_locales/index.json')
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const getPreferredLocales = extension.i18n ? promisify(
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extension.i18n.getAcceptLanguages,
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{ errorFirst: false },
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) : async () => []
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const existingLocaleCodes = allLocales.map(locale => locale.code.toLowerCase().replace('_', '-'))
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/**
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* Returns a preferred language code, based on settings within the user's browser. If we have no translations for the
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* users preferred locales, 'en' is returned.
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*
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* @returns {Promise<string>} Promises a locale code, either one from the user's preferred list that we have a translation for, or 'en'
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*
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*/
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async function getFirstPreferredLangCode () {
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let userPreferredLocaleCodes
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try {
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userPreferredLocaleCodes = await getPreferredLocales()
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} catch (e) {
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// Brave currently throws when calling getAcceptLanguages, so this handles that.
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userPreferredLocaleCodes = []
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}
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// safeguard for Brave Browser until they implement chrome.i18n.getAcceptLanguages
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// https://github.com/MetaMask/metamask-extension/issues/4270
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if (!userPreferredLocaleCodes) {
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userPreferredLocaleCodes = []
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}
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const firstPreferredLangCode = userPreferredLocaleCodes
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.map(code => code.toLowerCase())
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.find(code => existingLocaleCodes.includes(code))
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return firstPreferredLangCode || 'en'
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}
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module.exports = getFirstPreferredLangCode
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