import type { MarkedExtension } from 'marked';
/**
 * Valid GitHub-style alert types.
 *
 * @see https://docs.github.com/en/get-started/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax#alerts
 */
export type AlertType = 'note' | 'tip' | 'important' | 'warning' | 'caution';
/**
 * Creates a marked extension that tokenizes GitHub-style alert blockquotes
 * into custom `alert` tokens.
 *
 * The extension produces block-level tokens with
 * `{ type: 'alert', raw, text, alertType }` where `alertType` is one of
 * `note`, `tip`, `important`, `warning`, or `caution`, and `text` is the
 * alert body with leading `> ` stripped.
 *
 * Pair it with `AlertRenderer` (or your own component) to render the alerts.
 *
 * @example
 * ```svelte
 * <script lang="ts">
 *   import SvelteMarkdown from '@humanspeak/svelte-markdown'
 *   import { markedAlert, AlertRenderer } from '@humanspeak/svelte-markdown/extensions'
 *
 *   const renderers = { alert: AlertRenderer }
 * </script>
 *
 * <SvelteMarkdown
 *   source={markdown}
 *   extensions={[markedAlert()]}
 *   {renderers}
 * />
 * ```
 *
 * @returns A `MarkedExtension` with a single block-level `alert` tokenizer
 */
export declare function markedAlert(): MarkedExtension;