/** True when value is neither `null` nor `undefined` (strict; avoids loose `!= null`). */
export declare function isPresent<T>(value: T | null | undefined): value is T;
export declare function parseSizeFromTitle(title: string | undefined): {
    width?: number;
    height?: number;
    cleanTitle: string;
};
/** Reconstruct Platform dimension suffix for markdown image title. */
export declare function formatSizeTitle(width?: number, height?: number): string;
/**
 * Parse image block attributes from markdown alt and title.
 * Supports Platform format (![caption](url "=WxH")) and legacy Milkdown format (![ratio](url "caption")).
 */
export declare function parseImageBlock(alt: string | undefined, title: string | undefined, nodeWidth?: number, nodeHeight?: number): {
    ratio: number;
    caption: string;
    width?: number;
    height?: number;
};