"use strict";
/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.dev/license
 */
Object.defineProperty(exports, "__esModule", { value: true });
exports.createAngularLocaleDataPlugin = createAngularLocaleDataPlugin;
/**
 * The base module location used to search for locale specific data.
 */
const LOCALE_DATA_BASE_MODULE = '@angular/common/locales/global';
/**
 * Creates a Vite plugin that resolves Angular locale data files from `@angular/common`.
 *
 * @returns A Vite plugin.
 */
function createAngularLocaleDataPlugin() {
    return {
        name: 'angular-locale-data',
        enforce: 'pre',
        async resolveId(source) {
            if (!source.startsWith('angular:locale/data:')) {
                return;
            }
            // Extract the locale from the path
            const originalLocale = source.split(':', 3)[2];
            // Remove any private subtags since these will never match
            let partialLocale = originalLocale.replace(/-x(-[a-zA-Z0-9]{1,8})+$/, '');
            let exact = true;
            while (partialLocale) {
                const potentialPath = `${LOCALE_DATA_BASE_MODULE}/${partialLocale}`;
                const result = await this.resolve(potentialPath);
                if (result) {
                    if (!exact) {
                        this.warn(`Locale data for '${originalLocale}' cannot be found. Using locale data for '${partialLocale}'.`);
                    }
                    return result;
                }
                // Remove the last subtag and try again with a less specific locale
                const parts = partialLocale.split('-');
                partialLocale = parts.slice(0, -1).join('-');
                exact = false;
                // The locales "en" and "en-US" are considered exact to retain existing behavior
                if (originalLocale === 'en-US' && partialLocale === 'en') {
                    exact = true;
                }
            }
            return null;
        },
    };
}