declare module 'katex/contrib/copy-tex/katex2tex' {
    /**
     * Set these to how you want inline and display math to be delimited.
     */
    export interface CopyDelimiters {
        inline: ['$', '$'] | ['(', ')'];
        display: ['$$', '$$'] | ['[', ']'];
    }
    /**
     * Replace .katex elements with their TeX source (<annotation> element).
     * Modifies fragment in-place.  Useful for writing your own 'copy' handler,
     * as in https://github.com/KaTeX/KaTeX/blob/master/contrib/copy-tex/copy-tex.js.
     * @param fragment Selected fragment of the DOM.
     * @param copyDelimiters Delimiters for inline and display math.
     */
    export default function katexReplaceWithTex(
        fragment: DocumentFragment,
        copyDelimiters?: CopyDelimiters,
    ): DocumentFragment;
}