import { CallHandler } from '@nestjs/common';
import { EventEmitter } from 'events';
import { CircuitBreakerOptions } from '../types/CircuitBreakerOptions';
export declare class CircuitBreakerEventEmitter extends EventEmitter {
    private state;
    private failureCount;
    private successCount;
    private lastError;
    private nextAttempt;
    private options;
    constructor(options?: CircuitBreakerOptions);
    exec(next: CallHandler): any;
    private handleSuccess;
    private handleError;
}