/**
 * Plugin manager for discovering and loading evaluator plugins.
 *
 * Supports:
 * 1. Built-in evaluators (TypeScript, HTML)
 * 2. External plugins via npm packages with praisonaibench.evaluators field
 * 3. Programmatic registration via register() method
 *
 * External plugins should declare evaluators in package.json:
 * ```json
 * {
 *   "praisonaibench": {
 *     "evaluators": {
 *       "python": "./dist/evaluator.js"
 *     }
 *   }
 * }
 * ```
 */
import { BaseEvaluator } from './base-evaluator';
export interface LoadedPlugin {
    language: string;
    packageName: string;
    evaluator: BaseEvaluator;
}
/**
 * Manages evaluator plugins for different languages.
 *
 * Automatically discovers and loads plugins from:
 * 1. Built-in evaluators (TypeScript, HTML)
 * 2. npm packages with praisonaibench.evaluators in package.json
 */
export declare class PluginManager {
    private evaluators;
    private loadedPlugins;
    constructor(autoDiscover?: boolean);
    /**
     * Load built-in evaluators (TypeScript/JavaScript and HTML).
     */
    private loadBuiltinEvaluators;
    /**
     * Discover and load plugins from npm packages.
     *
     * Scans node_modules for packages with praisonaibench.evaluators field.
     */
    discoverPlugins(): void;
    /**
     * Load a single plugin from plugin info.
     */
    private loadPlugin;
    /**
     * Load a plugin from a specific npm package.
     *
     * @param packageName - Name of the npm package
     * @returns True if plugin was loaded successfully
     */
    loadPluginFromPackage(packageName: string): boolean;
    /**
     * Register an evaluator for a language.
     *
     * @param language - Language identifier (case-insensitive)
     * @param evaluator - Evaluator instance
     */
    register(language: string, evaluator: BaseEvaluator): void;
    /**
     * Get evaluator for a language.
     *
     * @param language - Language identifier (case-insensitive)
     * @returns Evaluator instance or undefined if not found
     */
    getEvaluator(language: string): BaseEvaluator | undefined;
    /**
     * Get list of all supported languages.
     *
     * @returns List of language identifiers
     */
    listLanguages(): string[];
    /**
     * Check if evaluator exists for a language.
     *
     * @param language - Language identifier (case-insensitive)
     * @returns True if evaluator exists
     */
    hasEvaluator(language: string): boolean;
    /**
     * Unregister an evaluator.
     *
     * @param language - Language identifier to unregister
     */
    unregister(language: string): boolean;
    /**
     * Get list of loaded external plugins.
     */
    getLoadedPlugins(): LoadedPlugin[];
    /**
     * Get plugin info for a specific language.
     */
    getPluginInfo(language: string): LoadedPlugin | undefined;
    /**
     * Reload all plugins (useful for development).
     */
    reloadPlugins(): void;
}
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