import type { AbTestAssignment } from '../types';
import type { CachedAbTest } from './types';
/**
 * Perform weighted random selection to assign a variant.
 *
 * @param test - The cached test with pre-computed weights
 * @returns Object with selectedKey (variant ID or "control") and variant slug
 */
export declare function selectVariant(test: CachedAbTest): {
    selectedKey: string;
    variantSlug: string;
};
/**
 * Create an assignment object for a newly selected variant.
 *
 * @param test - The cached test
 * @param selectedKey - The selected variant ID or "control"
 * @param variantSlug - The slug of the selected variant
 * @param originalPath - The original URL path where the test was assigned
 * @returns Assignment object to store in cookie
 */
export declare function createAssignment(test: CachedAbTest, selectedKey: string, variantSlug: string, originalPath: string): AbTestAssignment;
/**
 * Validate an existing cookie assignment against current CMS config.
 *
 * @param test - The cached test with current config
 * @param assignment - The assignment from the cookie
 * @returns true if assignment is still valid, false if it should be re-assigned
 */
export declare function isValidAssignment(test: CachedAbTest, assignment: AbTestAssignment): boolean;
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