/// <reference types="node" resolution-mode="require"/>
import { type Readable } from 'stream';
export type HTTPType = 'http1' | 'http2';
export type ReadHTTPHeaderResult = {
    type: HTTPType;
    headerMap: Map<string, string>;
};
export declare function readHTTPHeaders(stream: Readable): Promise<ReadHTTPHeaderResult | undefined>;
export type ReadTLSResult = {
    type: 'tls';
    serverName: string | undefined;
    alpnProtocols: string[] | undefined;
};
export type ReadHTTPHeadersOrTLSResult = ReadHTTPHeaderResult | ReadTLSResult;
export declare function readHTTPHeadersOrTLS(stream: Readable): Promise<ReadHTTPHeadersOrTLSResult | undefined>;