export type RateLimitResult = {
    allowed: true;
} | {
    allowed: false;
    retryAfterMs: number;
};
export interface RateLimiter {
    check(key: string, bucket: 'token' | 'identity'): Promise<RateLimitResult>;
}
export type RateLimitConfig = {
    perBucket: string;
};
export declare function defaultRateLimiter(cfg: RateLimitConfig, now?: () => number): RateLimiter;
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