export declare class Conf {
    protected opts: {
        env: Record<string, string>;
        mergeEnv: boolean;
    };
    protected bag: Record<any, any>;
    constructor(opts?: {
        env: Record<string, string>;
        mergeEnv: boolean;
    });
    /**
     * read environment variable value
     * @param key
     * @returns
     */
    env(key: string): string | undefined;
    /**
     * read value from local environment, if not exists fallback to process
     * @param key
     * @returns
     */
    var(key: string): string | undefined;
    dvar(k: string, d: string): string;
    setVar(k: string, d: string): void;
    set<T = any>(k: any, v: T): T;
    get<T = any>(k: any, d?: T | null): T | null;
}