/**
 * Chroma vector backend for iranti.
 *
 * Implements the `VectorBackend` interface against a Chroma HTTP API server
 * (v2 tenant/database/collection path). Suitable for deployments that want
 * an external vector store separate from the primary Postgres database.
 *
 * Configuration (via `ChromaConfig` or env vars in the factory):
 *  - `url`        — Chroma server base URL (e.g. http://localhost:8000)
 *  - `collection` — collection name (default: iranti_facts)
 *  - `tenant`     — Chroma tenant (default: default_tenant)
 *  - `database`   — Chroma database (default: default_database)
 *  - `token`      — optional Bearer token for auth
 *
 * Collection IDs are resolved lazily and cached per instance so the class
 * can be constructed before the server is reachable.
 */
import { VectorBackend, VectorConsistencyFilter, VectorMutationDbClient, VectorSearchResult, VectorUpsertParams } from '../vectorBackend';
type ChromaConfig = {
    url: string;
    collection: string;
    tenant?: string;
    database?: string;
    token?: string;
};
export declare class ChromaBackend implements VectorBackend {
    private readonly baseUrl;
    private readonly collection;
    private readonly tenant;
    private readonly database;
    private readonly token?;
    private collectionId;
    constructor(config: ChromaConfig);
    private collectionsRoute;
    private recordsRoute;
    private request;
    private ensureCollection;
    upsert(params: VectorUpsertParams, _db?: VectorMutationDbClient): Promise<void>;
    delete(id: string, _db?: VectorMutationDbClient): Promise<void>;
    search(vector: number[], topK: number, filter?: Record<string, unknown>): Promise<VectorSearchResult[]>;
    listIndexedIds(filter?: VectorConsistencyFilter, pageSize?: number): Promise<string[]>;
    ping(): Promise<boolean>;
}
export {};
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