import { Env, EnvActions, EnvFactoryOpts } from "../sys-env.js";
export declare class NodeEnvActions implements EnvActions {
    #private;
    readonly _env: Record<string, string>;
    static new(opts: Partial<EnvFactoryOpts>): EnvActions;
    readonly opts: Partial<EnvFactoryOpts>;
    private constructor();
    register(env: Env): Env;
    active(): boolean;
    keys(): string[];
    get(key: string): string | undefined;
    set(key: string, value?: string): void;
    delete(key: string): void;
}
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