messageformat/lib/dir-utils.js

Intl.MessageFormat / Unicode MessageFormat 2 parser, runtime and polyfill

export const LRI = '\u2066';
export const RLI = '\u2067';
export const FSI = '\u2068';
export const PDI = '\u2069';
// Data source: RECOMMENDED and LIMITED_USE scripts from
// https://github.com/unicode-org/cldr/blob/1a914d1/common/properties/scriptMetadata.txt
const RTL = 'Adlm,Arab,Hebr,Mand,Nkoo,Rohg,Syrc,Thaa';
/** Get a default text direction for `locale`. */
export function getLocaleDir(locale) {
    if (locale) {
        try {
            if (typeof locale === 'string')
                locale = new Intl.Locale(locale);
            // @ts-expect-error -- New feature, API changed during Stage 3
            const info = locale.getTextInfo?.() ?? locale.textInfo;
            if (info?.direction)
                return info.direction;
            const script = locale.maximize().script;
            if (script)
                return RTL.includes(script) ? 'rtl' : 'ltr';
        }
        catch {
            // Use 'auto' on error
        }
    }
    return 'auto';
}