/**
 * Markdown → safe HTML for chat message rendering (widget).
 *
 * Uses markdown-it (CommonMark + linkify) then an allowlist sanitize —
 * keep in sync with inbox ChatMessageMarkdown / sanitize-html allowlist.
 */
import type { ContentType } from "../types";
/** Allow http(s), mailto, and relative / in-page hrefs; block javascript: etc. */
export declare function isSafeHref(href: string): boolean;
/**
 * Open a message-body link. The shadow host uses `pointer-events: none` so the
 * closed bubble doesn't block the page; native `<a>` navigation is unreliable
 * in that setup, while Preact button handlers still work.
 */
export declare function openMessageLink(href: string): void;
/**
 * Convert stored message content to safe HTML for bubble rendering.
 */
export declare function renderRichMessage(text: string, contentType?: ContentType): string;
/** Plain-text preview for channel list (strips widgets + HTML). */
export declare function plainTextMessagePreview(content: string, maxLength?: number): string;