export declare class Constants {
    private static _instance;
    private _envs;
    private constructor();
    /**
     * Singleton
     * @readonly
     * @static
     * @type {Constants}
     * @memberof Constants
     */
    static get instance(): Readonly<Constants>;
    /**
     * Known environment types
     * @readonly
     * @memberof Constants
     */
    get envs(): {
        dev: string;
        accept: string;
        prod: string;
    };
}
export declare const constants: Readonly<Constants>;