1
0
mirror of https://github.com/kremalicious/metamask-extension.git synced 2024-12-23 09:52:26 +01:00
metamask-extension/app/scripts/lib/get-first-preferred-lang-code.js
Mark Stacey 352dbd8831 Replace uses of hasOwnProperty.call with simpler alternatives (#11009)
Three uses of `hasOwnProperty.call` have been replaced with simpler
alternatives. I did this because I found this convention confusing.

The `ComposableObservableStore` changes required adding a check for
whether the `config` is defined, because the old syntax would allow
iterating over `undefined` as if it was an empty object. Functionally
it should be identical. A new test was added to highlight this
functionality.
2021-06-07 10:04:11 -02:30

47 lines
1.6 KiB
JavaScript

import extension from 'extensionizer';
import promisify from 'pify';
import allLocales from '../../_locales/index.json';
const getPreferredLocales = extension.i18n
? promisify(extension.i18n.getAcceptLanguages, { errorFirst: false })
: async () => [];
// mapping some browsers return hyphen instead underscore in locale codes (e.g. zh_TW -> zh-tw)
const existingLocaleCodes = {};
allLocales.forEach((locale) => {
if (locale && locale.code) {
existingLocaleCodes[locale.code.toLowerCase().replace('_', '-')] =
locale.code;
}
});
/**
* Returns a preferred language code, based on settings within the user's browser. If we have no translations for the
* users preferred locales, 'en' is returned.
*
* @returns {Promise<string>} Promises a locale code, either one from the user's preferred list that we have a translation for, or 'en'
*
*/
export default async function getFirstPreferredLangCode() {
let userPreferredLocaleCodes;
try {
userPreferredLocaleCodes = await getPreferredLocales();
} catch (e) {
// Brave currently throws when calling getAcceptLanguages, so this handles that.
userPreferredLocaleCodes = [];
}
// safeguard for Brave Browser until they implement chrome.i18n.getAcceptLanguages
// https://github.com/MetaMask/metamask-extension/issues/4270
if (!userPreferredLocaleCodes) {
userPreferredLocaleCodes = [];
}
const firstPreferredLangCode = userPreferredLocaleCodes
.map((code) => code.toLowerCase().replace('_', '-'))
.find((code) => existingLocaleCodes[code] !== undefined);
return existingLocaleCodes[firstPreferredLangCode] || 'en';
}