import type { AnalyticsEvent, EventMiddlewareFn, ScreenMiddlewareFn } from '../types';
/**
 * Enriches every event with a fixed set of extra properties.
 *
 * ```ts
 * analytics.addEventMiddleware(
 *   createPropertyEnricher({ app_version: '2.1.0', environment: 'production' })
 * );
 * ```
 */
export declare function createPropertyEnricher(properties: Record<string, any>): EventMiddlewareFn;
/**
 * Filters out events that don't pass the predicate.
 * If the predicate returns false the event is dropped silently.
 *
 * ```ts
 * analytics.addEventMiddleware(
 *   createEventFilter((event) => event.name !== 'internal_debug_event')
 * );
 * ```
 */
export declare function createEventFilter(predicate: (event: AnalyticsEvent) => boolean): EventMiddlewareFn;
/**
 * Transforms event names and/or properties before they reach adapters.
 *
 * ```ts
 * analytics.addEventMiddleware(
 *   createEventTransformer((event) => ({
 *     ...event,
 *     name: event.name.toLowerCase().replace(/ /g, '_'),
 *   }))
 * );
 * ```
 */
export declare function createEventTransformer(transform: (event: AnalyticsEvent) => AnalyticsEvent): EventMiddlewareFn;
/**
 * Adds UTM / attribution properties to every event.
 * Useful when you capture UTM params from a deep link.
 *
 * ```ts
 * analytics.addEventMiddleware(
 *   createAttributionEnricher({ utm_source: 'email', utm_medium: 'newsletter' })
 * );
 * ```
 */
export declare function createAttributionEnricher(attribution: Record<string, string>): EventMiddlewareFn;
/**
 * Screen middleware: filters out screens that match a blocklist.
 *
 * ```ts
 * analytics.addScreenMiddleware(
 *   createScreenFilter(['Loading', 'Splash'])
 * );
 * ```
 */
export declare function createScreenFilter(blocklist: string[]): ScreenMiddlewareFn;
/**
 * Screen middleware: enriches every screen event with extra properties.
 */
export declare function createScreenEnricher(properties: Record<string, any>): ScreenMiddlewareFn;
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