/**
 * @fileoverview Configuration file loader and manager
 * @module utils/ConfigLoader
 */
import type { ConfigFile, PdfOptions } from '../types/index.js';
/**
 * Configuration loader for loading and merging config files
 *
 * @example
 * ```typescript
 * const loader = new ConfigLoader();
 * const config = await loader.loadConfig('/path/to/project');
 * ```
 */
export declare class ConfigLoader {
    /** Cached configuration */
    private cachedConfig;
    /** Path to the loaded config file */
    private configPath;
    /**
     * Find a configuration file in the given directory or parent directories
     * @param startDir - Directory to start searching from
     * @returns Path to config file or null if not found
     */
    findConfigFile(startDir: string): Promise<string | null>;
    /**
     * Load configuration from a specific file
     * @param configPath - Path to the config file
     * @returns Loaded configuration
     */
    loadFromFile(configPath: string): Promise<ConfigFile>;
    /**
     * Load configuration from directory (auto-discover config file)
     * @param directory - Directory to search for config
     * @returns Loaded configuration or default config if not found
     */
    loadConfig(directory: string): Promise<ConfigFile>;
    /**
     * Get default configuration
     * @returns Default configuration object
     */
    getDefaultConfig(): ConfigFile;
    /**
     * Validate configuration object
     * @param config - Configuration to validate
     * @throws Error if configuration is invalid
     */
    private validateConfig;
    /**
     * Merge CLI options with config file options
     * CLI options take precedence over config file options
     * @param cliOptions - Options from command line
     * @param configOptions - Options from config file
     * @returns Merged options
     */
    mergeOptions(cliOptions: Partial<PdfOptions>, configOptions: Partial<PdfOptions>): PdfOptions;
    /**
     * Get the path to the loaded config file
     * @returns Config file path or null
     */
    getConfigPath(): string | null;
    /**
     * Get the cached configuration
     * @returns Cached config or null
     */
    getCachedConfig(): ConfigFile | null;
    /**
     * Create a sample configuration file
     * @param outputPath - Path where to create the config file
     */
    createSampleConfig(outputPath: string): Promise<void>;
}
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