import type { NextRequest } from 'next/server';
import { NextResponse } from 'next/server';
import type { AbTestAssignment } from '../types';
import type { AbTestMiddlewareConfig, AbTestResult, CachedAbTest } from './types';
/**
 * Create an A/B test middleware handler.
 *
 * This factory function returns a middleware handler that can be called
 * from your Next.js middleware to process A/B test assignments.
 *
 * @param config - Middleware configuration
 * @returns Async function that processes requests and returns NextResponse or null
 */
export declare function createAbTestMiddleware(config: AbTestMiddlewareConfig): (request: NextRequest) => Promise<NextResponse | null>;
/**
 * Low-level function to process an A/B test request.
 * Use this if you need more control over the response handling.
 */
export declare function processAbTestRequest(pathname: string, searchParams: URLSearchParams, cookieValue: string | undefined, store: ReturnType<AbTestMiddlewareConfig['getStore']>, cacheTtlMs: number, devTestData?: AbTestMiddlewareConfig['devTestData'], options?: Pick<AbTestMiddlewareConfig, 'pruneStaleAssignments' | 'respectExistingUrlParams' | 'onValidationFailure'>): Promise<AbTestResult>;
/**
 * Options for the static A/B test middleware.
 */
export interface StaticAbTestMiddlewareOptions {
    /** Name of the cookie used to store A/B test assignments. @default "ab-test-info" */
    cookieName?: string;
    /** Cookie max age in seconds. @default 2592000 (30 days) */
    cookieMaxAge?: number;
    /**
     * Path prefix to prepend when rewriting to a variant.
     * e.g. "/page-test" → rewrites to "/page-test/slug" instead of "/slug".
     * @default "" (no prefix)
     */
    variantPathPrefix?: string;
    /** Optional function to skip processing for certain pathnames. */
    shouldProcess?: (pathname: string) => boolean;
    /** Optional callback when a cookie assignment fails validation. */
    onValidationFailure?: (testId: string, assignment: AbTestAssignment) => void;
    /**
     * Remove cookie entries for tests no longer in the active config.
     * @default true
     */
    pruneStaleAssignments?: boolean;
    /**
     * When injecting url_params, skip keys already present on the request URL.
     * @default true
     */
    respectExistingUrlParams?: boolean;
}
/**
 * Create a synchronous A/B test middleware from a pre-generated static testsByPath map.
 */
export declare function createStaticAbTestMiddleware(staticTestsByPath: Record<string, CachedAbTest[]>, options?: StaticAbTestMiddlewareOptions): (request: NextRequest) => NextResponse | null;
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