export declare function loadEnvFile(path?: string): Record<string, string>;
/**
 * Merge KV pairs into .env (preserves existing lines, updates matching keys, appends new).
 */
export declare function writeEnvFile(updates: Record<string, string>, path?: string): void;
/**
 * Ensure .env is in .gitignore (only if .gitignore exists).
 */
export declare function ensureEnvGitignored(cwd?: string): boolean;