export type ValidationError = 'NotString' | 'Empty' | 'ControlChars' | 'DisallowedScheme' | 'MissingHost' | 'UnknownHost' | 'EmbeddedCredentials' | 'Relative' | 'BareRelative';
type DetailedResult = {
    valid: true;
} | {
    valid: false;
    error: ValidationError;
};
export type ValidateOptions = {
    allowRelative?: 'all' | 'prefixed';
    allowedSchemes?: Set<string>;
    /** Rejects a syntactically valid but hostless-looking host (`https://sdf`) — requires a public label+TLD shape, `localhost`, an IPv4 literal, or a bracketed IPv6 literal. */
    requireNamedHost?: boolean;
    /** With `requireNamedHost`, also accepts `localhost` / IPv4 / bracketed IPv6 as known hosts. */
    allowLocalHosts?: boolean;
};
export declare const validateHref: (input: unknown, opts?: ValidateOptions) => DetailedResult;
export {};