'fqdn' validator does not support the options from the underlying validator

[lestephane]

the 'fqdn' validator passes the input string to validate through to isFQDN without any extra options

  fqdn: (value) => validator.isFQDN(value),

But the isFQDN function supports options such as whether trailing dots are allowed

https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/types/validator/lib/isFQDN.d.ts

export interface IsFQDNOptions {
    /**
     * @default true
     */
    require_tld?: boolean | undefined;
    /**
     * @default false
     */
    allow_underscores?: boolean | undefined;
    /**
     * @default false
     */
    allow_trailing_dot?: boolean | undefined;
    /**
     * @default false
     */
    allow_numeric_tld?: boolean | undefined;
    /**
     * If `allow_wildcard` is set to true, the validator will allow domain starting with `*.` (e.g. `*.example.com` or `*.shop.example.com`).
     * @default false
     */
    allow_wildcard?: boolean | undefined;
}

/**
 * Check if the string is a fully qualified domain name (e.g. `domain.com`).
 *
 * @param [options] - Options
 */
export default function isFQDN(str: string, options?: IsFQDNOptions): boolean;

This is how I would have liked to use the fqdn library

export type DnsZoneName = VString<['2,128,lowercase', 'fqdn,allow_trailing_dot', 'endsWith,.']>
const FqdnDnsNameVSpec: VSpecOf<DnsZoneName> = ['2,128,lowercase', 'fqdn,allow_trailing_dot', 'endsWith,.']

• But fqdn,allow_trailing_dot won't work (as explained)
• ...and because 'fqdn' does not allow trailing dots by default, [... 'fqdn', 'endsWith,.'] won't work either.

So I don't have a way to validate that a string is a domain name with non optional trailing dot

I think the fqdn could be made more useful by supporting the optional boolean options in IsFQDNOptions.