/**
 * @module @nhtio/adk/batteries/vector/hnswlib
 *
 * Embedded HNSWLib adapter (in-process, no server — like in_memory/sqlite_vec/duckdb). hnswlib is
 * a pure ANN index keyed by integer labels and holding ONLY vectors, so this adapter pairs the
 * index with a JS sidecar that owns id↔label mapping plus the document/metadata records. KNN runs
 * through the HNSW index; metadata filtering, filter-scans, projection and delete are served from
 * the sidecar via the neutral filter tree's JS reference evaluator (exact cross-adapter parity).
 *
 * Driver: `hnswlib-node` (native addon; requires the build to be approved — see
 * pnpm-workspace.yaml `allowBuilds`). Persistence is in-memory per process; pass a fresh store per
 * use. (The index supports writeIndex/readIndex on disk, but the sidecar would need its own
 * persistence — out of scope for the in-memory contract here.)
 */
import { BaseVectorStore } from "../contract";
import type { SearchPlan, UpsertPlan, DeletePlan, CollectionSpec } from "../plan";
import type { VectorMatch, VectorStoreCapabilities, BaseVectorStoreOptions } from "../types";
export interface HnswlibVectorStoreOptions extends BaseVectorStoreOptions {
    /** Initial index capacity per collection; grows automatically via `resizeIndex`. Default 1024. */
    initialCapacity?: number;
}
export declare class HnswlibVectorStore extends BaseVectorStore {
    #private;
    readonly capabilities: VectorStoreCapabilities;
    /** Static availability probe: whether this adapter's runtime driver can load in the current environment. */
    static isAvailable(): boolean;
    isAvailable(): boolean;
    connect(): Promise<void>;
    close(): Promise<void>;
    createCollection(spec: CollectionSpec, ifNotExists: boolean): Promise<void>;
    dropCollection(collection: string, ifExists: boolean): Promise<void>;
    hasCollection(collection: string): Promise<boolean>;
    renameCollection(from: string, to: string): Promise<void>;
    executeUpsert(plan: UpsertPlan): Promise<void>;
    executeSearch(plan: SearchPlan): Promise<VectorMatch[]>;
    executeDelete(plan: DeletePlan): Promise<void>;
}