import { TransportState } from './models/TransportState';
import { HMSException } from '../error/HMSException';
import { HMSTrack } from '../media/tracks';
export default interface ITransportObserver {
    /**
     * Passes all the messages received from
     *  1. Signalling Server (JsonRPC/gRPC)
     *  2. Data Channel - at the moment only data-channel with label='ion-sfu'
     *    is created which send active-speaker events
     *
     * Each [message] has at most three fields:
     *  1. id: [String] - (Optional) A uuid-v4 used to match the response with the request that it is replying to.
     *    This member may be omitted if no response should be returned.
     *  2. method: [String] - (Optional) A String with the name of the method to be invoked.
     *    Method names that begin with "rpc." are reserved for rpc-internal methods.
     *  3. params: [JsonElement] - (Mandatory) A [JsonObject] or [JsonArray] of values to be
     *    passed as parameters to the defined method. This member may be omitted
     *
     * It is ensured that either one of `id` or `method` will always be present.
     *
     * In case of a response, `id` field will always be present along with below extra fields:
     *  1. result: [String] - The data returned by the invoked method.
     *    This element is formatted as a JSON-stat object. If an error occurred while invoking the
     *    method, this member must not exist.
     *  2. error: [String] - An error object if there was an error invoking the method,
     *    otherwise this member must not exist. The object must contain members
     *      2.1 code: [Int]
     *      2.2 message: [String]
     */
    onNotification(message: any): void;
    onConnected(): void;
    onTrackAdd(track: HMSTrack): void;
    onTrackRemove(track: HMSTrack): void;
    onFailure(exception: HMSException): void;
    onStateChange(state: TransportState, error?: HMSException): Promise<void>;
}