/**
 * Returns the canonical spelling of an IP address, so that one address always
 * yields one rate limit key: IPv4-mapped IPv6 becomes plain IPv4, and other
 * IPv6 addresses lose any zone ID and are lowercased and compressed as in RFC
 * 5952. Returns null for anything that is not an IP address.
 */
export declare function canonicalIp(ip: string): string | null;
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