Hydro/packages/html2md/lib.ts

import 'hydrooj';
import TurndownService from 'turndown';

declare module 'hydrooj' {
    interface Lib {
        convertHTML: (str: string) => string,
    }
}

const turndownService = new TurndownService({
    headingStyle: 'atx',
    codeBlockStyle: 'fenced',
    bulletListMarker: '-',
});

export function convertHTML(html: string) {
    return turndownService.turndown(html);
}

global.Hydro.lib.convertHTML = convertHTML;