/// <reference types="node" />
import * as streams from 'stream';
import Duplexify from 'duplexify';
import { InternalHolder, Options } from './types';
import { Header } from './header';
export interface RequestHeader {
    name: string;
}
export declare abstract class AbstractCommon extends Duplexify {
    protected readonly writeStream: streams.PassThrough;
    protected readonly readStream: streams.Writable;
    protected readonly holder: InternalHolder;
    private readonly _receiveBuffer;
    private _receiveHeader;
    protected _upgradeRequested: boolean;
    protected _upgraded: boolean;
    constructor(options?: Partial<Options>);
    get upgraded(): boolean;
    protected abstract handleIncoming(header: Header, content: Buffer | null): Promise<void>;
    protected sendPayload(header: Partial<Header>, data: Uint8Array | null): Promise<any>;
    protected upgradeTo(writable: streams.Writable, readable: streams.Readable): void;
}
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