export type CircuitState = 'closed' | 'open' | 'half-open';
export interface CircuitBreakerOptions {
    failureThreshold?: number;
    successThreshold?: number;
    halfOpenTimeout?: number;
    window?: number;
}
export declare class CircuitOpenError extends Error {
    readonly state: CircuitState;
    constructor(state?: CircuitState);
}
export declare class CircuitBreaker {
    private state;
    private failureCount;
    private successCount;
    private lastOpenedAt?;
    private failureTimes;
    private readonly failureThreshold;
    private readonly successThreshold;
    private readonly halfOpenTimeout;
    private readonly window;
    constructor(options?: CircuitBreakerOptions);
    getState(): CircuitState;
    execute<T>(fn: () => Promise<T>): Promise<T>;
    recordSuccess(): void;
    recordFailure(): void;
    reset(): void;
    private maybeTransitionToHalfOpen;
    private onSuccess;
    private onFailure;
    private pruneOldFailures;
}
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