/**
 * Reserved type prefixes and meta keys.
 * Avoid collisions in message routing.
 *
 * Reservations:
 * - __* (double underscore) → system/internal use
 * - $* (dollar) → private/implementation detail (framework)
 * - $ws:* → router lifecycle events (open/close)
 */
export declare const RESERVED_PREFIXES: readonly ["__", "$"];
/**
 * System message types for heartbeat.
 */
export declare const SYSTEM_MESSAGES: {
    readonly HEARTBEAT: "__heartbeat";
    readonly HEARTBEAT_ACK: "__heartbeat_ack";
};
/**
 * Router lifecycle event types.
 * These are used internally for onOpen/onClose handlers
 * and bypass validation plugins.
 */
export declare const SYSTEM_LIFECYCLE: {
    readonly OPEN: "$ws:open";
    readonly CLOSE: "$ws:close";
};
/**
 * Check if a type is reserved (system/internal use only).
 */
export declare function isReserved(type: string): boolean;
/**
 * Check if a type is a lifecycle event ($ws:open, $ws:close).
 * Lifecycle events bypass validation but are handled by router lifecycle hooks.
 */
export declare function isLifecycle(type: string): boolean;
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