export interface CookieAccessor {
    get: (name: string) => {
        value: string;
    } | undefined;
    set: (name: string, value: string, options?: {
        path?: string;
        expires?: Date;
        maxAge?: number;
        domain?: string;
        secure?: boolean;
        httpOnly?: boolean;
        sameSite?: 'strict' | 'lax' | 'none';
    }) => void;
}
export interface RequestContext {
    url?: string;
    pathname?: string;
    host?: string;
    headers?: Record<string, string>;
}
export type ABTestedDocument<T extends Record<string, unknown>> = T & {
    posthogAssignedVariantKey?: string;
    posthogFeatureFlagKeyUsed?: string;
    posthogServerDistinctId?: string;
    posthogNewDistinctIdGenerated?: string;
};
/**
 * Server-side helper to determine which A/B test variant to serve.
 * It reads cookies but DOES NOT set them directly. Cookie setting is delegated
 * to a Server Action or Route Handler.
 *
 * @param document The original Payload CMS document.
 * @param cookies The cookies object from Next.js `cookies()`.
 * @param context Optional request context for proper feature flag evaluation with release conditions.
 * @returns The content to display (either the variant or the original), augmented with PostHog details for client-side cookie setting.
 */
export declare const getServerSideABVariant: <D extends {
    abVariant?: Record<string, unknown>;
    enableABTesting?: boolean;
    posthogFeatureFlagKey?: string;
}, T extends Record<string, unknown> = Record<string, unknown>>(document: D & T, cookies: CookieAccessor, context?: RequestContext) => Promise<ABTestedDocument<T>>;