/**
 * Signals what kind of frame is being transmitted.
 */
export declare enum ControlCode {
    /**
     * A channel is proposed to the remote party.
     */
    offer = 0,
    /**
     * A channel proposal has been accepted.
     */
    offerAccepted = 1,
    /**
     * The payload of the frame is a payload intended for channel consumption.
     */
    content = 2,
    /**
     * Sent after all bytes have been transmitted on a given channel. Either or both sides may send this.
     * A channel may be automatically closed when each side has both transmitted and received this message.
     */
    contentWritingCompleted = 3,
    /**
     * Sent when a channel is closed, an incoming offer is rejected, or an outgoing offer is canceled.
     */
    channelTerminated = 4,
    /**
     * Sent when a channel has finished processing data received from the remote party, allowing them to send more data.
     */
    contentProcessed = 5,
    /**
     * Sent when a channel reader has completed and can no longer receive content,
     * so the remote party can stop transmitting and release any writer blocked on flow control.
     * Only sent when the protocol version supports backpressure (v2 and later).
     */
    contentReadingCompleted = 6
}