import type { StoreStatus, StoreInitResult } from '../types/init-result.js';
/**
 * Atomic read-modify-write store for app-config environment variables.
 * Stores bare KEY="escaped_value" format compatible with Docker Compose env_file.
 * Serializes writes via an in-process mutex; this store is owned by a single
 * control-plane daemon per cluster.
 */
export declare class AppConfigEnvStore {
    private envPath;
    private writeChain;
    private status;
    private disabledReason?;
    constructor(envPath?: string);
    init(): Promise<void>;
    getStatus(): StoreStatus;
    getInitResult(): StoreInitResult;
    /** Get value of a single env var. Returns undefined if not found. */
    get(name: string): Promise<string | undefined>;
    /** Set an env var. Atomic rewrite under advisory lock. */
    set(name: string, value: string): Promise<void>;
    /** Delete an env var. Returns true if it existed, false otherwise. */
    delete(name: string): Promise<boolean>;
    /** List all env var names and their values. */
    list(): Promise<Map<string, string>>;
    /** Parse the env file into a Map<name, value>. */
    private readAll;
    /** Serialize and atomically write the env file. */
    private writeAll;
    /** Serialize writes through an in-process promise chain. */
    private withLock;
}
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