export function toUnicode(domain: string, options?: { useStd3ASCII: boolean }): string
export function toAscii(domain: string, options?: { transitional: boolean; useStd3ASCII: boolean; verifyDnsLength: boolean }): string

export function convert(domains: string): { IDN: string; PC: string }
export function convert(domains: string[]): { IDN: string[]; PC: string[] }
export function convert(domains: string | string[]): { IDN: string | string[]; PC: string | string[] }