/**
 * OAuth2ProviderLoader - Loads provider definitions from YAML files
 *
 * Pattern: Configuration-driven providers
 * - Loads provider definitions from tools/[provider]/definition.yaml
 * - Discovers providers with type: provider
 * - Makes endpoints available to OAuth2Handler
 * - Supports infinite providers without code changes
 *
 * Usage:
 * ```typescript
 * const loader = new OAuth2ProviderLoader('./tools');
 * const providers = await loader.loadProviders();
 * const googleEndpoints = providers.get('google');
 * ```
 */
import { OAuth2Endpoints } from './oauth2-config.js';
import { type ProviderDefinition } from '../core/schema.js';
/**
 * OAuth2ProviderLoader - Loads OAuth2 provider configurations from YAML
 *
 * Design Principle:
 * - Configuration-driven: All provider config in YAML files
 * - Discoverable: Automatically finds tools/[provider]/definition.yaml with type: provider
 * - Extensible: Add new providers by adding YAML file, no code changes
 * - Overridable: Users can override via env vars or runtime config
 */
export declare class OAuth2ProviderLoader {
    private toolsPath;
    private providers;
    private definitions;
    constructor(toolsPath: string);
    /**
     * Load all provider definitions from tools directory
     *
     * Discovers tools/[provider]/definition.yaml files with type: provider
     * Validates and stores provider endpoint configurations
     *
     * @returns Map of provider name → OAuth2Endpoints
     * @throws MatimoError if invalid provider definition found
     */
    loadProviders(): Promise<Map<string, OAuth2Endpoints>>;
    /**
     * Get endpoints for a specific provider
     * @param providerName - Name of the provider (e.g., 'google', 'github')
     * @returns OAuth2Endpoints or undefined if provider not found
     */
    getProvider(providerName: string): OAuth2Endpoints | undefined;
    /**
     * Get full provider definition
     * @param providerName - Name of the provider
     * @returns ProviderDefinition or undefined if provider not found
     */
    getDefinition(providerName: string): ProviderDefinition | undefined;
    /**
     * List all loaded providers
     */
    listProviders(): string[];
    /**
     * Validate provider definition structure using Zod schema
     */
    protected validateProviderDefinition(definition: ProviderDefinition): void;
    /**
     * Register a provider definition
     */
    private registerProvider;
}
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