import type { Hook, HookContext, EvaluationDetails, JsonValue } from '@openfeature/server-sdk';
import type { IEvaluator } from '../evaluator/evaluator';
import type { EventPublisher } from '../service/event-publisher';
/**
 * DataCollectorHook is a hook that collects data during the evaluation of feature flags.
 */
export declare class DataCollectorHook implements Hook {
    private readonly evaluator;
    private readonly eventPublisher;
    /**
     * DataCollectorHook is a hook that collects data during the evaluation of feature flags.
     * @param evaluator - service to evaluate the flag
     * @param eventPublisher - service to publish events
     * @throws Error if evaluator or eventPublisher is null
     */
    constructor(evaluator: IEvaluator, eventPublisher: EventPublisher);
    /**
  
     * Called immediately after successful flag evaluation.
     * @param context - Provides context of innovation
     * @param details - Flag evaluation information
     * @param _hints - Caller provided data
     */
    after<T extends JsonValue>(context: HookContext<T>, details: EvaluationDetails<T>, _hints?: Record<string, unknown>): Promise<void>;
    /**
     * Called immediately after an unsuccessful flag evaluation.
     * @param context - Provides context of innovation
     * @param error - Exception representing what went wrong
     * @param hints - Caller provided data
     */
    error<T extends JsonValue>(context: HookContext<T>, _error: Error, _hints?: Record<string, unknown>): Promise<void>;
}