export interface MathSpan {
    tex: string;
    display: boolean;
}
export interface ExtractedMath {
    text: string;
    spans: MathSpan[];
    /** Nonce the placeholders in ``text`` were built with. */
    token: string;
}
/** Whether the text is worth scanning at all. Answers with no math at all are
 * the common case and skipping them keeps streaming flushes cheap. */
export declare function hasMathDelimiters(text: string): boolean;
/**
 * Replace every complete math span in ``source`` with a placeholder token,
 * returning the rewritten Markdown plus the spans in placeholder order.
 *
 * Only closed spans are extracted. A `$$` still waiting for its closing
 * delimiter mid-stream stays literal text and becomes math on a later flush,
 * once the rest of it has arrived.
 */
export declare function extractMath(source: string): ExtractedMath;
/**
 * Put the extracted spans back into sanitized HTML as <biel-math> elements.
 * Runs after DOMPurify because custom elements do not survive sanitizing, and
 * the TeX itself is carried in an attribute the component only ever reads as
 * text — it is never parsed as HTML.
 */
export declare function restoreMath(html: string, math: ExtractedMath, mathjaxUrl?: string): string;