import NativeEvents from '../../utils/NativeEvents';
import type { UnsubscribeFunction } from '../conference/models';
import type { MessageReceivedEventType } from './events';
/**
The CommandService allows the application to send and receive text messages and notifications during a conference.
 */
export declare class CommandService {
    /** @internal */
    _nativeModule: any;
    /** @internal */
    _nativeEvents: NativeEvents;
    /**
     * Sends a message to all conference participants.
     * @param message The message to send.
     */
    send(message: string): Promise<void>;
    /**
     * Adds a listener to the event informing about new messages received.
     * @param handler An event callback function.
     * @returns A function that unsubscribes from event listeners.
     */
    onMessageReceived(handler: (data: MessageReceivedEventType) => void): UnsubscribeFunction;
}
declare const _default: CommandService;
export default _default;