import type { RateLimitConfig } from './types.js';
/**
 * Token bucket rate limiter with async acquisition.
 */
export declare class RateLimiter {
    private config;
    private tokens;
    private lastRefill;
    constructor(config: RateLimitConfig);
    acquire(): Promise<void>;
    private refill;
}
export declare function isRateLimitError(message: string | null): boolean;
export declare function calculateBackoffMs(attempt: number, strategy: RateLimitConfig['backoffStrategy']): number;
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