import { GeoRegion, ICountry } from './countries';
import * as i0 from "@angular/core";
/**
 * Service to lazy load country data.
 * This reduces the initial bundle size by loading country data on-demand.
 */
export declare class CountriesLoaderService {
    private readonly http;
    private countriesData?;
    private loadPromise?;
    /**
     * True when the last load attempt failed (countries.json couldn't be
     * fetched/parsed). Consumers can read this to show an error in the UI. Reset
     * to false on a successful (re)load. See `reload()` to retry.
     */
    readonly loadFailed: import("@angular/core").WritableSignal<boolean>;
    /**
     * Loads country data from JSON file.
     * Subsequent calls return the same promise (singleton pattern).
     */
    private loadCountries;
    /**
     * Discards the cached data and re-attempts the load — used to retry after a
     * failure (`loadFailed()` is true). Resolves once the reload settles.
     */
    reload(): Promise<void>;
    /**
     * Gets all countries as an array.
     * Automatically loads country data if not yet loaded.
     */
    getCountries(): Promise<readonly ICountry[]>;
    /**
     * Gets countries by ID lookup.
     * Automatically loads country data if not yet loaded.
     */
    getCountriesByID(): Promise<Record<string, ICountry>>;
    /**
     * Gets a specific country by ID.
     * Automatically loads country data if not yet loaded.
     */
    getCountryByID(id: string): Promise<ICountry | undefined>;
    /**
     * Gets the unknown country constant.
     * Automatically loads country data if not yet loaded.
     */
    getUnknownCountry(): Promise<ICountry>;
    private loadedCountries;
    /**
     * Gets countries filtered by geo region.
     * Automatically loads country data if not yet loaded.
     */
    getCountriesByRegion(region: GeoRegion): Promise<readonly ICountry[]>;
    static ɵfac: i0.ɵɵFactoryDeclaration<CountriesLoaderService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<CountriesLoaderService>;
}