MCP Web Tools Server

import type { Nullable } from '../utils'; /** * Transforms a domain name into a canonical domain name. The canonical domain name is a domain name * that has been trimmed, lowercased, stripped of leading dot, and optionally punycode-encoded * ({@link https://www.rfc-editor.org/rfc/rfc6265.html#section-5.1.2 | Section 5.1.2 of RFC 6265}). For * the most part, this function is idempotent (calling the function with the output from a previous call * returns the same output). * * @remarks * A canonicalized host name is the string generated by the following * algorithm: * * 1. Convert the host name to a sequence of individual domain name * labels. * * 2. Convert each label that is not a Non-Reserved LDH (NR-LDH) label, * to an A-label (see Section 2.3.2.1 of [RFC5890] for the former * and latter), or to a "punycode label" (a label resulting from the * "ToASCII" conversion in Section 4 of [RFC3490]), as appropriate * (see Section 6.3 of this specification). * * 3. Concatenate the resulting labels, separated by a %x2E (".") * character. * * @example * ``` * canonicalDomain('.EXAMPLE.com') === 'example.com' * ``` * * @param domainName - the domain name to generate the canonical domain from * @public */ export declare function canonicalDomain(domainName: Nullable<string>): string | undefined;