import { HttpClient } from '@angular/common/http';
/**
 * Config object (read from JSON).
 */
export declare class CustomConfig {
    private origin;
    private http;
    private static CONFIG_FOLDER;
    private static CONFIG_FILE_SUFFIX;
    private static CONFIG_FILE_PROD;
    private static CONFIG_FILE_DEV;
    private _isLoaded;
    private _config;
    private _fileName;
    constructor(origin: string, // Needed for SSR
    http: HttpClient);
    private getConfigFile;
    loadConfig(configFile: (string | null)): Promise<boolean>;
    /**
     * Use to get the data found in the second file (config file)
     */
    get(key: string): (Object | null);
    getString(key: string): (string | null);
    getNumber(key: string, defaultVal?: number): number;
    getBoolean(key: string): boolean;
    load(): Promise<boolean>;
}