@ant-design/x/locale/useLocale.js

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import defaultAntdEnUS from 'antd/locale/en_US';
import * as React from 'react';
import LocaleContext from "./context";
import defaultLocaleData from "./en_US";
const useLocale = (componentName, defaultLocale) => {
  const fullLocale = React.useContext(LocaleContext);
  const getLocale = React.useMemo(() => {
    const locale = defaultLocale || defaultLocaleData?.[componentName] || defaultAntdEnUS?.[componentName];
    const localeFromContext = fullLocale?.[componentName] ?? {};
    return {
      ...(typeof locale === 'function' ? locale() : locale),
      ...(localeFromContext || {})
    };
  }, [componentName, defaultLocale, fullLocale]);
  const getLocaleCode = React.useMemo(() => {
    const localeCode = fullLocale?.locale;
    // Had use LocaleProvide but didn't set locale
    if (fullLocale?.exist && !localeCode) {
      return defaultLocaleData.locale;
    }
    return localeCode;
  }, [fullLocale]);
  return [getLocale, getLocaleCode];
};
export default useLocale;