import { ConfigModuleOptionsInterface } from '../types/interfaces';
export declare class ConfigService {
    private readonly envConfig;
    private readonly fallbackToProcessEnv;
    private readonly debug;
    constructor(options: ConfigModuleOptionsInterface);
    private printDebug;
    get(key: string, options?: {
        defaultValue?: string;
    }): string;
    has(key: string): boolean;
    hasAll(...keys: string[]): boolean;
    static isDevelopment(): boolean;
    static isProduction(): boolean;
}