payload/dist/utilities/sanitizeFallbackLocale.js

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/**
 * Sanitizes fallbackLocale based on a provided fallbackLocale, locale and localization config
 *
 * Handles the following scenarios:
 * - determines if a fallback locale should be used
 * - determines if a locale specific fallback should be used in place of the default locale
 * - sets the fallbackLocale to 'null' if no fallback locale should be used
 */ export const sanitizeFallbackLocale = ({ fallbackLocale, locale, localization })=>{
    if (fallbackLocale === undefined || fallbackLocale === null) {
        if (localization && localization.fallback) {
            // Check for locale specific fallback
            const localeSpecificFallback = localization.locales.length ? localization.locales.find((localeConfig)=>localeConfig.code === locale)?.fallbackLocale : undefined;
            if (localeSpecificFallback) {
                return localeSpecificFallback;
            }
            return localization.defaultLocale;
        }
        return false;
    } else if (Array.isArray(fallbackLocale)) {
        return fallbackLocale.filter((localeCode)=>localization.localeCodes.includes(localeCode));
    } else if (fallbackLocale) {
        if ([
            'false',
            'none',
            'null'
        ].includes(fallbackLocale)) {
            return false;
        }
        if (localization.localeCodes.includes(fallbackLocale)) {
            return fallbackLocale;
        }
    }
    return false;
};

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