/**
 * Token-bucket rate limiter for Slack API (Tier 2: ~50 req/min default).
 * Prevents 429 storms by throttling requests client-side.
 */
export declare function sleep(ms: number): Promise<void>;
export declare function acquireToken(): Promise<void>;
export declare function getRetryAfterMs(retryAfterHeader: string | null): number | null;
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