export interface ChunkAttribution {
    fileId: string;
    fileName: string;
}
export interface ChunkAttributionStore {
    /**
     * Record attribution for a chunk under a specific vector store. Later
     * `lookup(vectorStoreId, chunkId)` calls will return this attribution so
     * `searchResultsToOpenAI` can map RAG chunks back to the original upload's
     * `file_id` and `filename`.
     */
    record: (vectorStoreId: string, chunkId: string, attribution: ChunkAttribution) => void;
    /** Look up attribution. Returns null when the chunk has no recorded source (eg. ingested before the current process). */
    lookup: (vectorStoreId: string, chunkId: string) => ChunkAttribution | null;
    /** Drop all attributions for a vector store; called on DELETE so the map cannot leak across the store's lifetime. */
    evict: (vectorStoreId: string) => void;
}
export declare function createChunkAttributionStore(): ChunkAttributionStore;
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