/**
 * Vector backend factory for iranti.
 *
 * Selects and instantiates the correct `VectorBackend` implementation based on
 * `IRANTI_VECTOR_BACKEND` (env var) or the `config.vectorBackend` override.
 * Supported values: `pgvector` (default), `qdrant`, `chroma`.
 *
 *  - `pgvector` — uses the primary Postgres connection; zero additional infra
 *  - `qdrant`   — requires `IRANTI_QDRANT_URL`; optional API key + collection
 *  - `chroma`   — defaults to `http://localhost:8000`; optional tenant/db/token
 *
 * `resolveVectorBackendName` is exported separately so callers can log or
 * display the active backend name without instantiating it.
 */
import { VectorBackend } from '../vectorBackend';
export type VectorBackendConfig = {
    vectorBackend?: string;
    qdrantUrl?: string;
    qdrantApiKey?: string;
    qdrantCollection?: string;
    chromaUrl?: string;
    chromaCollection?: string;
    chromaTenant?: string;
    chromaDatabase?: string;
    chromaToken?: string;
};
export declare function resolveVectorBackendName(config?: VectorBackendConfig): string;
export declare function createVectorBackend(config?: VectorBackendConfig): VectorBackend;
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