export class MessageHandler {
    constructor(sourceName: any, targetName: any, comObj: any);
    sourceName: any;
    targetName: any;
    comObj: any;
    callbackId: number;
    streamId: number;
    postMessageTransfers: boolean;
    streamSinks: any;
    streamControllers: any;
    callbackCapabilities: any;
    actionHandler: any;
    _onComObjOnMessage: (event: any) => void;
    on(actionName: any, handler: any): void;
    /**
     * Sends a message to the comObj to invoke the action with the supplied data.
     * @param {string} actionName - Action to call.
     * @param {JSON} data - JSON data to send.
     * @param {Array} [transfers] - List of transfers/ArrayBuffers.
     */
    send(actionName: string, data: JSON, transfers?: any[] | undefined): void;
    /**
     * Sends a message to the comObj to invoke the action with the supplied data.
     * Expects that the other side will callback with the response.
     * @param {string} actionName - Action to call.
     * @param {JSON} data - JSON data to send.
     * @param {Array} [transfers] - List of transfers/ArrayBuffers.
     * @returns {Promise} Promise to be resolved with response data.
     */
    sendWithPromise(actionName: string, data: JSON, transfers?: any[] | undefined): Promise<any>;
    /**
     * Sends a message to the comObj to invoke the action with the supplied data.
     * Expect that the other side will callback to signal 'start_complete'.
     * @param {string} actionName - Action to call.
     * @param {JSON} data - JSON data to send.
     * @param {Object} queueingStrategy - Strategy to signal backpressure based on
     *                 internal queue.
     * @param {Array} [transfers] - List of transfers/ArrayBuffers.
     * @returns {ReadableStream} ReadableStream to read data in chunks.
     */
    sendWithStream(actionName: string, data: JSON, queueingStrategy: Object, transfers?: any[] | undefined): ReadableStream;
    /**
     * @private
     */
    private _createStreamSink;
    /**
     * @private
     */
    private _processStreamMessage;
    /**
     * @private
     */
    private _deleteStreamController;
    /**
     * Sends raw message to the comObj.
     * @param {Object} message - Raw message.
     * @param transfers List of transfers/ArrayBuffers, or undefined.
     * @private
     */
    private _postMessage;
    destroy(): void;
}