import { Envelope } from './protocol';
export interface MessageChannel {
    send(envelope: Envelope): void;
    /** Returns an unsubscribe function. Multiple subscriptions are allowed. */
    onMessage(cb: (envelope: Envelope) => void): () => void;
    /** Fires once — after disconnect the channel is considered dead. */
    onDisconnect(cb: () => void): () => void;
    /** Close the channel from this side. */
    close(): void;
}
/** Channel factory — needed for reconnect: on disconnect TransportClient calls
 *  the factory again and gets a fresh channel. */
export type ChannelFactory = () => MessageChannel;
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