/**
 * Environment File Management Utilities for NeuroLink CLI
 *
 * Handles .env file operations including backup, update, and validation.
 */
export interface EnvBackupResult {
    backupPath?: string;
    existed: boolean;
}
export interface EnvUpdateResult {
    backup: EnvBackupResult;
    updated: string[];
    added: string[];
    unchanged: string[];
}
/**
 * Create a timestamped backup of the existing .env file
 */
export declare function backupEnvFile(envPath?: string): EnvBackupResult;
/**
 * Parse .env file content into key-value pairs
 */
export declare function parseEnvFile(content: string): Record<string, string>;
/**
 * Generate .env file content from key-value pairs
 */
export declare function generateEnvContent(envVars: Record<string, string>, existingContent?: string): string;
/**
 * Update .env file with new environment variables
 */
export declare function updateEnvFile(newVars: Record<string, string>, envPath?: string, createBackup?: boolean): EnvUpdateResult;
/**
 * Display environment file update summary
 */
export declare function displayEnvUpdateSummary(result: EnvUpdateResult, quiet?: boolean): void;
/**
 * Validate .env file format and required variables
 */
export declare function validateEnvFile(envPath?: string, requiredVars?: string[]): {
    valid: boolean;
    errors: string[];
    warnings: string[];
    variables: Record<string, string>;
};