import { IFlagEvaluationDetails } from './flag-evaluation-details-builder';
export declare enum HoldoutVariationEnum {
    STATUS_QUO = "status_quo",
    ALL_SHIPPED = "all_shipped_variants"
}
export type NullableHoldoutVariationType = HoldoutVariationEnum | null;
/**
 * Holds data about the variation a subject was assigned to.
 * @public
 */
export interface IAssignmentEvent {
    /** * An Eppo allocation key */
    allocation: string | null;
    /** * An Eppo experiment key */
    experiment: string | null;
    /** * An Eppo feature flag key */
    featureFlag: string;
    /** * The assigned variation */
    variation: string | null;
    /** * The entity or user that was assigned to a variation */
    subject: string;
    /** * The time the subject was exposed to the variation. */
    timestamp: string;
    subjectAttributes: Record<string, any>;
    [propName: string]: unknown;
    metaData?: Record<string, unknown>;
    /** * The format of the flag. */
    format: string;
    /** * The flag evaluation details. Null if the flag was precomputed. */
    evaluationDetails: IFlagEvaluationDetails | null;
    /** * The entity ID of the subject, if present. */
    entityId?: number | null;
}
/**
 * Implement this interface log variation assignments to your data warehouse.
 * @public
 */
export interface IAssignmentLogger {
    /**
     * Invoked when a subject is assigned to an experiment variation.
     * @param assignment holds the variation an experiment subject was assigned to
     * @public
     */
    logAssignment(assignment: IAssignmentEvent): void;
}
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