import type { Plugin } from "unified";
export type ExternalLinksOptions = {
    /**
     * Predicate to decide whether a URL is external.
     *
     * Defaults to absolute http(s) URLs.
     *
     * @example
     * (href) => href.startsWith("https://") && !href.includes("lix.dev")
     */
    isExternal?: (href: string) => boolean;
    /**
     * Target attribute to apply to external links.
     *
     * @default "_blank"
     */
    target?: string;
    /**
     * Rel attribute to apply to external links.
     *
     * @default "noopener noreferrer"
     */
    rel?: string;
};
/**
 * Remark plugin that annotates external links so `remark-rehype` emits `target` and `rel`.
 *
 * Intended to be used as an opt-in feature from `parse()` or `serializeToHtml()`.
 *
 * @example
 * unified().use(remarkExternalLinks, true)
 */
export declare const remarkExternalLinks: Plugin<[
    ExternalLinksOptions | boolean | undefined
], any>;
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