Fix MDX stack trace location with frontmatter (#11717)

withastro · Aug 16, 2024 · 423614e · 423614e
1 parent 0109690
commit 423614e
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diff --git a/.changeset/mighty-trees-teach.md b/.changeset/mighty-trees-teach.md
@@ -0,0 +1,5 @@
+---
+'@astrojs/mdx': patch
+---
+
+Fixes stack trace location when failed to parse an MDX file with frontmatter
diff --git a/packages/integrations/mdx/src/vite-plugin-mdx.ts b/packages/integrations/mdx/src/vite-plugin-mdx.ts
@@ -44,9 +44,10 @@ export function vitePluginMdx(mdxOptions: MdxOptions): Plugin {
 		async transform(code, id) {
 			if (!id.endsWith('.mdx')) return;
 
-			const { data: frontmatter, content: pageContent } = parseFrontmatter(code, id);
+			const { data: frontmatter, content: pageContent, matter } = parseFrontmatter(code, id);
+			const frontmatterLines = matter ? matter.match(/\n/g)?.join('') + '\n\n' : '';
 
-			const vfile = new VFile({ value: pageContent, path: id });
+			const vfile = new VFile({ value: frontmatterLines + pageContent, path: id });
 			// Ensure `data.astro` is available to all remark plugins
 			setVfileFrontmatter(vfile, frontmatter);