/**
 * Rate limiting: enforce maxPending and maxPayloadBytes.
 * Enabled via createRouter({ limits: { maxPending, maxPayloadBytes } }).
 *
 * Behavior:
 * - Reject incoming messages if queue is full (maxPending)
 * - Reject messages larger than maxPayloadBytes
 * - No new API surface (transparent behavior)
 */
export interface LimitsConfig {
    maxPending?: number;
    maxPayloadBytes?: number;
}
/**
 * Per-connection limit state.
 */
export interface LimitState {
    pending: number;
}
/**
 * Limits manager (internal).
 */
export declare class LimitsManager {
    private config;
    constructor(config: LimitsConfig);
    createState(): LimitState;
    checkIncoming(payload: unknown, state: LimitState): boolean;
    recordPending(state: LimitState): void;
    releasePending(state: LimitState): void;
}
//# sourceMappingURL=limits.d.ts.map