import type { EmbeddingConfig, CreateBackendResult } from './types.js';
export * from './types.js';
export { chunkArray } from './types.js';
export { OllamaBackend, DEFAULT_OLLAMA_MODEL } from './ollama.js';
export { GeminiBackend } from './gemini.js';
export { RateLimiter, type RateLimiterConfig } from './rate-limiter.js';
/**
 * Create an embedding backend based on configuration and available credentials.
 *
 * Tries backends in priority order:
 * 1. Gemini (if GEMINI_API_KEY environment variable is set) - free tier, recommended
 * 2. Ollama (local fallback, requires Ollama to be running)
 *
 * If an explicitly configured backend fails to initialize (e.g., rate limited),
 * automatically falls back to Ollama and returns fallback info.
 *
 * @param config - Optional configuration to customize the backend
 * @returns A promise resolving to the backend and optional fallback info
 * @throws Error if no backend is available (no API keys and Ollama not running)
 *
 * @example
 * ```typescript
 * // Use automatic backend selection
 * const { backend } = await createEmbeddingBackend();
 *
 * // Force a specific backend (will fallback to Ollama on failure)
 * const { backend, fallback } = await createEmbeddingBackend({ backend: 'gemini' });
 * if (fallback) {
 *   console.warn(`Fell back to ${fallback.fallbackBackend}: ${fallback.reason}`);
 * }
 * ```
 */
export declare function createEmbeddingBackend(config?: Partial<EmbeddingConfig>): Promise<CreateBackendResult>;
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