import { Experiment, EvaluationContext, ExperimentAssignment } from './types';
/**
 * Deterministically assigns a user to an experiment variation based on weights.
 *
 * @param experiment The experiment definition with variations and weights
 * @param context The evaluation context (to extract stickiness key)
 * @returns The assigned variation details, or null if assignment fails
 */
export declare function assignVariation(experiment: Experiment | undefined, context: EvaluationContext | undefined): ExperimentAssignment | null;