declare function tls( ikm: Buffer | string, length: number, option?: tls.Options ): Buffer; declare namespace tls { interface Options { salt?: Buffer | string; label?: string; context?: Buffer | string; hash?: string; } export function info( length: number, label: string, context?: Buffer | string, ): Buffer; export function expand_label( hash: string, hash_len: number, prk: Buffer | string, length: number, label: string, context?: Buffer | string, ): Buffer; } export = tls;