import TurndownService from "turndown";
const turndownService = new TurndownService({
headingStyle: "atx",
codeBlockStyle: "fenced",
bulletListMarker: "-",
emDelimiter: "*",
strongDelimiter: "**",
linkStyle: "inlined"
});
turndownService.addRule("removeEmptyElements", {
filter: (node: HTMLElement) => {
return node.textContent?.trim() === "" && !["IMG", "BR", "HR"].includes(node.nodeName);
},
replacement: () => ""
});
turndownService.addRule("preserveCodeBlocks", {
filter: ["pre", "code"],
replacement: (content: string, node: HTMLElement) => {
if (node.nodeName === "PRE") {
const code = node.querySelector("code");
const lang = code?.className.match(/language-(\w+)/)?.[1] || "";
return `\n\`\`\`${lang}\n${content}\n\`\`\`\n`;
}
return `\`${content}\``;
}
});
export function htmlToMarkdown(html: string): string | null {
try {
if (!html || html.trim().length === 0) return null;
const markdown = turndownService.turndown(html);
if (!markdown || markdown.trim().length === 0) return null;
return markdown.trim();
} catch (error) {
console.error("Markdown conversion failed:", error);
return null;
}
}
