/**
 * Sliding-window rate limiter.
 *
 * start.gg documents "no more than 80 requests per 60 seconds"; the default
 * budget stays below that. `acquire()` resolves when the caller may send one
 * request. Callers queue fairly (FIFO) via an internal promise chain.
 */
export interface RateLimiterOptions {
    maxRequests: number;
    windowMs: number;
    now?: () => number;
    sleep?: (ms: number) => Promise<void>;
}
export declare class RateLimiter {
    private readonly maxRequests;
    private readonly windowMs;
    private readonly now;
    private readonly sleep;
    private timestamps;
    private queue;
    constructor(opts: RateLimiterOptions);
    /** Resolves when a request slot is available; records the slot as used. */
    acquire(): Promise<void>;
    private waitForSlot;
}