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fix(i18n): enhance default language fallback #19107

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Sep 12, 2023
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fix(i18n): enhance default language fallback #19107

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2 changes: 1 addition & 1 deletion src/core/locale.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -37,7 +37,7 @@ const localeModels: Dictionary<Model> = {};
export const SYSTEM_LANG = !env.domSupported ? DEFAULT_LOCALE : (function () {
const langStr = (
/* eslint-disable-next-line */
document.documentElement.lang || navigator.language || (navigator as any).browserLanguage
document.documentElement.lang || navigator.language || (navigator as any).browserLanguage || DEFAULT_LOCALE
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Can you explain when and which item will be undefined?

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Browser: Firefox ESR 52.5.2_x86

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Though I tested it in Firefox ESR 52.5.2 (Win64) and found the language is not undefined, adding a fallback to prevent potential errors is always good.

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Yes, It can meet some customized terminals (customized browser).

).toUpperCase();
return langStr.indexOf(LOCALE_ZH) > -1 ? LOCALE_ZH : DEFAULT_LOCALE;
})();
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