feat: add new htmlToMarkdown function

Author: mikouaji

app/utils/html-to-markdown.ts

@@ -0,0 +1,21 @@
+import { parseFragment } from 'parse5'
+import { fromParse5 } from 'hast-util-from-parse5'
+import { toMdast } from 'hast-util-to-mdast'
+import { toMarkdown as mdastToMarkdown } from 'mdast-util-to-markdown'
+import { gfmTableToMarkdown } from 'mdast-util-gfm-table'
+
+export interface HtmlToMarkdownOptions {
+  /** Whether to pad table columns to equal width (default: `true`). */
+  tablePipeAlign?: boolean
+}
+
+/**
+ * Convert an HTML string to Markdown
+ */
+export function htmlToMarkdown(html: string, options: HtmlToMarkdownOptions = {}): string {
+  const { tablePipeAlign = true } = options
+  const dom = parseFragment(html)
+  const hast = fromParse5(dom)
+  const mdast = toMdast(hast)
+  return mdastToMarkdown(mdast, { extensions: [gfmTableToMarkdown({ tablePipeAlign })] })
+}