import type { Client } from "../client";
export declare class Friend {
    private readonly client;
    readonly key: string;
    online?: boolean;
    /**
     * @internal
     */
    constructor(client: Client, key: string);
    /**
     * Send an instant message to the friend.
     *
     * @param message Message to send.
     */
    message(message: string): Promise<void>;
}