import { MilkdownPlugin } from '@milkdown/kit/ctx';
import { Root } from 'mdast';
export declare const VIDEO_NODE_NAME = "video";
export declare const DEFAULT_VIDEO_WIDTH = 640;
export declare const DEFAULT_VIDEO_HEIGHT = 360;
/**
 * Check if a URL points to a video file by extension
 */
export declare function isVideoFile(url: string): boolean;
/**
 * Extract filename from URL for use as default title
 */
export declare function extractFilenameFromUrl(url: string): string;
/**
 * Remark plugin that transforms video links into videoNode AST nodes.
 *
 * Detects:
 * - Links with video file extensions (.mp4, .webm, etc.)
 * - Markdown format: [title WxH](url.mp4) or [title](url.mp4)
 * - Internal attachment links: [title WxH](/api/attachments.redirect?...) (platform export format)
 */
/** Applies the same mdast transform as `remarkVideoPlugin` (exported for unit tests). */
export declare function transformVideoLinksInMdast(tree: Root): void;
export declare const remarkVideoPlugin: import('@milkdown/utils').$Remark<"video-transform", unknown>;
/**
 * Video node schema for ProseMirror
 *
 * Attrs MUST match Platform's Video.tsx for Y.js collab sync:
 * - id: unique identifier (can be null)
 * - src: video URL
 * - width: pixel width
 * - height: pixel height
 * - title: caption/alt text
 */
export declare const videoNode: import('@milkdown/utils').$Node;
/**
 * Export all video plugins for registration
 */
export declare const videoPlugin: MilkdownPlugin[];