export declare type Message<T> = NextMessage<T> | ErrorMessage | EndMessage;
export declare enum MessageType {
    Next = 0,
    Error = 1,
    End = 2
}
export interface NextMessage<T> {
    type: MessageType.Next;
    value: T;
}
export interface ErrorMessage {
    type: MessageType.Error;
    error: Error;
}
export interface EndMessage {
    type: MessageType.End;
}