export type HtmdxHeading = {
    id: string;
    label: string;
};
export type RenderContext = {
    headings: HtmdxHeading[];
    slugCounts: Map<string, number>;
};
export type SafeImageAttributes = {
    src: string;
    alt: string;
    className: string;
    title?: string;
    width?: number;
    height?: number;
    loading?: 'eager' | 'lazy';
    decoding?: 'async' | 'auto' | 'sync';
};
export declare function slugify(value: string): string;
export declare function uniqueSlug(value: string, context: RenderContext): string;
export declare function safeHref(value: string): string | null;
export declare function safeImageAttributes(attributes: Record<string, string | undefined>): SafeImageAttributes | null;
export declare function decodeHtmlEntities(value: string): string;
export declare function escapeHtml(value: string): string;