intl-locales-supported/lib/index.js

Utility to help you polyfill the Node.js runtime when the Intl APIs are missing, or if the built-in Intl is missing locale data that you need.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
/*
 * Copyright 2015, Yahoo Inc.
 * Copyrights licensed under the New BSD License.
 * See the accompanying LICENSE file for terms.
 */
function areIntlLocalesSupported(locales) {
    if (typeof Intl === 'undefined') {
        return false;
    }
    if (!locales) {
        throw new Error('locales must be supplied.');
    }
    if (!Array.isArray(locales)) {
        locales = [locales];
    }
    var intlConstructors = [
        Intl.Collator,
        Intl.DateTimeFormat,
        Intl.NumberFormat
    ].filter(Boolean);
    if (intlConstructors.length === 0) {
        return false;
    }
    return intlConstructors.every(function (intlConstructor) {
        return intlConstructor.supportedLocalesOf(locales).length === locales.length;
    });
}
exports.default = areIntlLocalesSupported;
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