/**
 * Token-bucket rate limiter.
 *
 * Limits the number of send operations per account within a time window.
 * Defaults to 10 sends per 60-second window.
 */
export default class RateLimiter {
    private buckets;
    private readonly maxTokens;
    private readonly windowMs;
    constructor(maxPerMinute?: number);
    /**
     * Try to consume a token for the given account.
     * @returns `true` if allowed, `false` if rate-limited.
     */
    tryConsume(accountName: string): boolean;
    /**
     * Get remaining tokens for an account.
     */
    remaining(accountName: string): number;
}
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