/**
 * Limits manager: enforces maxPending and maxPayloadBytes constraints.
 * Fast path for in-flight message tracking.
 */
/**
 * Limits configuration.
 */
export interface LimitsConfig {
    maxPending?: number;
    maxPayloadBytes?: number;
}
/**
 * In-flight message tracker and enforcer.
 * Increments counter on message start; decrements on completion.
 * Throws if maxPending limit is exceeded.
 */
export declare class LimitsManager {
    readonly config: LimitsConfig;
    private inFlight;
    constructor(config?: LimitsConfig);
    /**
     * Begin tracking a new in-flight message.
     * Throws if maxPending would be exceeded.
     * Returns a release function to call when message completes.
     */
    begin(): () => void;
    /**
     * Get current in-flight message count.
     */
    currentInFlight(): number;
    /**
     * Check if payload size exceeds limit.
     * Returns true if size is acceptable, false otherwise.
     */
    checkPayloadSize(size: number): boolean;
}
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