import { HttpClient } from '@angular/common/http';
import * as i0 from "@angular/core";
/**
 * Global application config.
 * AppConfig needs to be initialized via APP_INITIALIZER.
 * For example,
 * providers: [
 *   { provide: APP_INITIALIZER, useFactory: (config: AppConfig) => () => config.load(), deps: [AppConfig], multi: true },
 * ]
 */
export declare class AppConfig {
    private origin;
    private http;
    private static CONFIG_FOLDER;
    private static CONFIG_FILE_PROD;
    private static CONFIG_FILE_DEV;
    private fileName;
    private _config;
    private _isLoaded;
    constructor(origin: string, // Needed for SSR
    http: HttpClient);
    getConfigFile(): string;
    setConfigFile(_fileName: string): boolean;
    /**
     * Returns all config key-value pairs as a hash/object.
     */
    get all(): {
        [key: string]: any;
    };
    sub(key: string): Object;
    /**
     * Returns the config value for the given key.
     */
    get(key: string): (any | null);
    getString(key: string, defaultVal?: string): (string | null);
    getNumber(key: string, defaultVal?: number): number;
    getBoolean(key: string, defaultVal?: boolean): boolean;
    /**
     * Loads the config asynchronously.
     */
    load(): Promise<unknown>;
    static ɵfac: i0.ɵɵFactoryDeclaration<AppConfig, [{ optional: true; }, null]>;
    static ɵprov: i0.ɵɵInjectableDeclaration<AppConfig>;
}