import type { Clock } from "./abstractions.js";
export interface RateLimiter {
    acquire(key: string, signal?: AbortSignal): Promise<void>;
    close(): void;
}
export interface TokenBucketRateLimiterOptions {
    capacity: number;
    refillTokens?: number;
    refillIntervalMs: number;
    maxQueue: number;
    clock?: Clock;
}
export declare class RateLimitQueueFullError extends Error {
    readonly key: string;
    readonly maxQueue: number;
    constructor(key: string, maxQueue: number);
}
export declare class RateLimiterClosedError extends Error {
    constructor();
}
export declare class TokenBucketRateLimiter implements RateLimiter {
    #private;
    constructor(options: TokenBucketRateLimiterOptions);
    acquire(key: string, signal?: AbortSignal): Promise<void>;
    pending(key?: string): number;
    close(): void;
}
//# sourceMappingURL=rate-limiter.d.ts.map