import { Buffer } from 'buffer';
import { SocketMetadata } from './socket-extensions';
export declare function getSocketMetadata(existingMetadata: SocketMetadata | undefined, metadataInput: string | Buffer): any;
export declare function getSocketMetadataFromProxyAuth(socket: {
    [SocketMetadata]?: SocketMetadata;
}, proxyAuth: string): any;
export declare function getSocketMetadataTags(metadata: SocketMetadata | undefined): string[];
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