/**
 * Environment Variable Storage Backend
 *
 * Handles credentials from:
 * 1. Workspace .env files (highest priority)
 * 2. Global .env files (medium priority)
 * 3. System environment variables (lowest priority)
 */
import { BaseStorage } from './base-storage.js';
export declare class EnvStorage extends BaseStorage {
    [key: string]: any;
    constructor(options?: Record<string, any>);
    /**
     * Get all .env file paths in priority order
     * @private
     * @returns {string[]}
     */
    _getEnvFilePaths(): any[];
    /**
     * Parse .env file content
     * @private
     * @param {string} content - File content
     * @returns {Object<string, string>}
     */
    _parseEnvFile(content: any): Record<string, any>;
    /**
     * Load all environment variables from all sources
     * @private
     * @returns {Object<string, {value: string, source: string}>}
     */
    _loadAllEnvVars(): any;
    /**
     * Invalidate cache (call after writing .env files)
     * @private
     */
    _invalidateCache(): void;
    /**
     * Get credential for a provider
     * @param {string} provider - Provider name
     * @returns {Promise<string|null>}
     */
    get(provider: any): Promise<any>;
    /**
     * Set credential for a provider (writes to workspace .env.local)
     * @param {string} provider - Provider name
     * @param {string} credential - Credential value
     * @param {Object} metadata - Additional metadata
     * @returns {Promise<void>}
     */
    set(provider: any, credential: any, _metadata?: Record<string, any>): Promise<void>;
    _writeEnvValues(values: Record<string, string | undefined>): Promise<void>;
    /**
     * Delete credential for a provider (removes from workspace .env.local)
     * @param {string} provider - Provider name
     * @returns {Promise<boolean>}
     */
    delete(provider: any): Promise<boolean>;
    /**
     * List all providers with credentials
     * @returns {Promise<string[]>}
     */
    list(): Promise<any[]>;
    /**
     * Get metadata for a credential
     * @param {string} provider - Provider name
     * @returns {Promise<Object|null>}
     */
    getMetadata(provider: any): Promise<{
        source: any;
        filePath: any;
        envKeys: string[];
        envKey?: undefined;
    } | {
        envKeys?: undefined;
        source: any;
        filePath: any;
        envKey: any;
    } | null>;
    /**
     * Get all configuration for a provider (including additional config keys)
     * @param {string} provider - Provider name
     * @returns {Promise<Object>}
     */
    getConfig(provider: any): Promise<Record<string, any>>;
    /**
     * Get storage type identifier
     * @returns {string}
     */
    getType(): string;
    /**
     * Get human-readable storage name
     * @returns {string}
     */
    getName(): string;
    /**
     * Get priority for this storage type
     * @returns {number}
     */
    getPriority(): number;
}
export default EnvStorage;