import { EventEmitter } from "node:events";
import { type EndpointMetadata as WireEndpointMetadata } from "../vendor/protocol/outer/index.js";
import type { Ed25519Keypair } from "../pairing/crypto.js";
export type EndpointMetadata = {
    [Key in keyof WireEndpointMetadata]: Exclude<WireEndpointMetadata[Key], null>;
};
export type HostConnectOptions = {
    role: "host";
    endpointId: string;
    runtimeInstanceId: string;
    metadata: EndpointMetadata;
    authorizedOwnerIds: readonly string[];
};
export type OwnerConnectOptions = {
    role: "owner";
};
export type ConnectOptions = HostConnectOptions | OwnerConnectOptions;
export interface RelayClientEvents {
    message: [line: string];
    close: [];
    error: [err: Error];
}
/** Authenticated WebSocket client for the endpoint relay. */
export declare class RelayClient extends EventEmitter {
    private readonly url;
    private readonly keypair;
    private ws;
    private lastActivityAt;
    private livenessTimer;
    private livenessSocket;
    private pendingConnection;
    private pendingMessage;
    constructor(url: string, keypair: Ed25519Keypair);
    connect(options?: ConnectOptions): Promise<void>;
    isOpen(): boolean;
    send(line: string): void;
    sendControl(frame: object): boolean;
    close(): void;
    private finishConnection;
    private startLiveness;
    private stopLiveness;
    private authenticate;
    private nextMessage;
    private isPendingConnection;
    private assertPendingConnection;
    private resolvePendingConnection;
    private abortPendingConnection;
    private clearConnectTimer;
    private clearPendingConnectionListeners;
    private cancelPendingMessage;
    private reportError;
    private asError;
    private rawSend;
}