/**
 * Circuit Breaker Pattern
 *
 * Prevents cascading failures by opening the circuit after too many failures.
 * States: closed (normal) -> open (failing) -> half-open (testing) -> closed
 */
import type { CircuitState, CircuitBreakerConfig } from './types.js';
export declare class CircuitBreaker {
    private config;
    private state;
    private failures;
    private successes;
    private lastFailureTime;
    private halfOpenAttempts;
    constructor(config: CircuitBreakerConfig);
    /**
     * Check if a request can proceed.
     */
    canRequest(): boolean;
    /**
     * Record a successful request.
     */
    recordSuccess(): void;
    /**
     * Record a failed request.
     */
    recordFailure(): void;
    /**
     * Get current circuit state.
     */
    getState(): CircuitState;
    /**
     * Get circuit breaker statistics.
     */
    getStats(): {
        state: CircuitState;
        failures: number;
        successes: number;
        lastFailureTime: number | null;
        halfOpenAttempts: number;
    };
    /**
     * Force reset the circuit breaker to closed state.
     */
    forceReset(): void;
    /**
     * Update state based on recovery time.
     */
    private updateState;
    /**
     * Transition to a new state with event emission.
     */
    private transitionTo;
    /**
     * Reset internal counters.
     */
    private reset;
}
/**
 * Create a circuit breaker with default configuration.
 */
export declare function createCircuitBreaker(config?: Partial<CircuitBreakerConfig>): CircuitBreaker;
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