import type { PlainSearchParameters, RecommendParameters } from 'algoliasearch-helper';
/**
 * Forwards the insights-related search parameters to every Recommend query.
 *
 * The insights middleware writes `userToken` and `clickAnalytics` on the main
 * helper's search state, which only feeds search queries: Recommend queries are
 * built from their own parameters and never read the search state. Without this,
 * recommendations can't be personalized, and their responses carry no `queryID`
 * for the connectors to attribute click and conversion events with.
 *
 * Parameters set on a widget win, so an explicit `queryParameters.userToken`
 * keeps overriding the middleware.
 *
 * The fallback query is a regular search, so it gets the same treatment — but
 * only merged into a `fallbackParameters` the widget already set. See below.
 */
export declare function addInsightsToRecommendParameters(recommendParameters: RecommendParameters, { userToken, clickAnalytics }: PlainSearchParameters): RecommendParameters;