/**
 * Config Writer Utility
 *
 * Updates values in stack.yml while preserving comments and formatting.
 * Uses line-level string replacement instead of yaml.dump() to avoid
 * stripping comments or reformatting the file.
 */
/**
 * Update a nested value in stack.yml using line-based replacement.
 * Preserves comments, formatting, and key order.
 *
 * @param rootDir - Project root directory
 * @param keyPath - Dot-separated path (e.g., 'prod.domain')
 * @param value - New value to set
 * @returns true if updated successfully
 */
export declare function updateConfigValue(rootDir: string, keyPath: string, value: string): boolean;
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