import { Base } from "../abstracts/Base.js";
import type { ListenerEventAdditionalData, ListenerEventRawData } from "../types/index.js";
/**
 * Handles Discord gateway events and dispatches them to registered listeners.
 * @internal
 */
export declare class EventHandler extends Base {
    private eventQueue;
    constructor(client: typeof Base.prototype.client);
    handleEvent<T extends keyof ListenerEventRawData>(payload: ListenerEventRawData[T] & ListenerEventAdditionalData, type: T): boolean;
    getMetrics(): {
        queueSize: number;
        queueSizeByLane: {
            critical: number;
            standard: number;
            background: number;
        };
        processingByLane: {
            critical: number;
            standard: number;
            background: number;
        };
        processed: number;
        dropped: number;
        droppedStale: number;
        timeouts: number;
        zombieExecutions: number;
        oldestAgeMsByLane: {
            critical: number;
            standard: number;
            background: number;
        };
        laneConfig: Record<"critical" | "standard" | "background", Required<import("./EventQueue.js").EventQueueLaneOptions>>;
    };
    hasCapacity(): boolean;
}
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