/**
 * Entry in a vector index — a chunk with its embedding and storage reference.
 */
export interface VectorEntry {
    id: string;
    vector: Float32Array;
    storageId: string;
    metadata: Record<string, string>;
}
/**
 * Search result with relevance score.
 */
export interface ScoredEntry {
    entry: VectorEntry;
    score: number;
}
/**
 * Pluggable vector index. Built-in: in-memory brute-force cosine similarity.
 * Users can swap to Qdrant, Pinecone, Weaviate, etc.
 *
 * `add()` uses upsert semantics: if an entry with the same ID exists, it is replaced.
 */
export interface VectorIndex {
    add(entries: VectorEntry[]): Promise<void>;
    search(query: Float32Array, topK: number): Promise<ScoredEntry[]>;
    delete(ids: string[]): Promise<void>;
    readonly size: number;
}
/**
 * Optional mixin for vector indices that support local snapshot persistence.
 * Only applicable to local/in-memory backends — remote backends (Qdrant, etc.)
 * manage their own persistence.
 */
export interface SerializableVectorIndex extends VectorIndex {
    serialize(): Promise<Uint8Array>;
    deserialize(data: Uint8Array): Promise<void>;
}
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