import { GatewayPlugin } from "../gateway/GatewayPlugin.js";
import type { GatewayPluginOptions } from "../gateway/types.js";
type RuntimeProfile = "serverless" | "persistent";
export interface GatewayForwarderDeliveryOptions {
    timeoutMs?: number;
    maxRetries?: number;
    baseBackoffMs?: number;
    maxBackoffMs?: number;
    jitterRatio?: number;
    maxInFlight?: number;
    maxQueueSize?: number;
    retryStatusCodes?: number[];
}
export interface GatewayForwarderPluginOptions extends GatewayPluginOptions {
    /**
     * The URL to forward webhook events to.
     * Typically this is your base URL in the client, and then `/events`
     */
    webhookUrl: string;
    /**
     * Optional headers to add to the webhook request.
     */
    webhookHeaders?: Record<string, string>;
    /**
     * Runtime profile that controls delivery defaults.
     *
     * @default "serverless"
     */
    runtimeProfile?: RuntimeProfile;
    /**
     * Delivery policy for forwarded events.
     */
    delivery?: GatewayForwarderDeliveryOptions;
    /**
     * Custom fetch for forwarding delivery.
     */
    fetch?: (input: string | URL | Request, init?: RequestInit) => Promise<Response>;
    /**
     * The ed25519 private key in PEM format, used to sign forwarded events.
     * This should include the BEGIN/END markers. When loading from an environment
     * variable, the newlines can be escaped (\\n).
     */
    privateKey: string;
}
export declare class GatewayForwarderPlugin extends GatewayPlugin {
    readonly id: "gateway";
    readonly options: GatewayForwarderPluginOptions;
    private privateKey;
    private guildAvailabilityCache;
    private deliveryPolicy;
    private deliveryExecutor;
    private forwardFetch;
    private deliveryMetrics;
    private failureReasons;
    constructor(options: GatewayForwarderPluginOptions);
    protected setupWebSocket(): void;
    getDeliveryMetrics(): {
        queueDepth: number;
        inFlight: number;
        policy: Required<GatewayForwarderDeliveryOptions>;
        failureReasons: {
            [k: string]: number;
        };
        accepted: number;
        sent: number;
        retried: number;
        failed: number;
        dropped: number;
        timeouts: number;
        lastFailureReason: string | null;
        lastFailureEventType: string | null;
        lastFailureAt: number;
        lastSuccessAt: number;
        oldestQueuedAgeMs: number;
    };
    private enqueueDelivery;
    private deliver;
    private sendWithTimeout;
    private getRetryDelay;
    private trackFailure;
}
export {};
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