fix(#3264): ensure that remark files pass in file information

packages/astro/src/vite-plugin-markdown/index.ts

@@ -127,7 +127,7 @@ export default function markdown({ config }: AstroPluginOptions): Plugin {
 				// Turn HTML comments into JS comments
 				markdownContent = markdownContent.replace(/<\s*!--([^-->]*)(.*?)-->/gs, (whole) => `{/*${whole}*/}`)
 
-				let renderResult = await renderMarkdown(markdownContent, renderOpts);
+				let renderResult = await renderMarkdown(markdownContent, { ...renderOpts, fileURL: fileUrl });
 				let { code: astroResult, metadata } = renderResult;
 				const { layout = '', components = '', setup = '', ...content } = frontmatter;
 				content.astro = metadata;

packages/markdown/remark/package.json

@@ -42,7 +42,8 @@
     "shiki": "^0.10.1",
     "unified": "^10.1.2",
     "unist-util-map": "^3.1.1",
-    "unist-util-visit": "^4.1.0"
+    "unist-util-visit": "^4.1.0",
+    "vfile": "^5.3.2"
   },
   "devDependencies": {
     "@types/chai": "^4.3.1",

packages/markdown/remark/src/index.ts

@@ -19,6 +19,7 @@ import markdownToHtml from 'remark-rehype';
 import rehypeStringify from 'rehype-stringify';
 import rehypeRaw from 'rehype-raw';
 import Slugger from 'github-slugger';
+import { VFile } from 'vfile';
 
 export * from './types.js';
 
@@ -35,7 +36,8 @@ export async function renderMarkdown(
 	content: string,
 	opts: MarkdownRenderingOptions = {}
 ): Promise<MarkdownRenderingResult> {
-	let { mode = 'mdx', syntaxHighlight = 'shiki', shikiConfig = {}, remarkPlugins = [], rehypePlugins = [] } = opts;
+	let { fileURL, mode = 'mdx', syntaxHighlight = 'shiki', shikiConfig = {}, remarkPlugins = [], rehypePlugins = [] } = opts;
+	const input = new VFile({ value: content, path: fileURL })
 	const scopedClassName = opts.$?.scopedClassName;
 	const isMDX = mode === 'mdx';
 	const { headers, rehypeCollectHeaders } = createCollectHeaders();
@@ -97,7 +99,7 @@ export async function renderMarkdown(
 		const vfile = await parser
 			.use([rehypeCollectHeaders])
 			.use(rehypeStringify, { allowDangerousHtml: true, allowParseErrors: true })
-			.process(content);
+			.process(input);
 		result = vfile.toString();
 	} catch (err) {
 		console.error(err);

packages/markdown/remark/src/types.ts

@@ -35,6 +35,8 @@ export interface AstroMarkdownOptions {
 }
 
 export interface MarkdownRenderingOptions extends AstroMarkdownOptions {
+	/** @internal */
+	fileURL?: URL;
 	/** @internal */
 	$?: {
 		scopedClassName: string | null;

packages/markdown/remark/test/plugins.test.js

@@ -0,0 +1,26 @@
+import { renderMarkdown } from '../dist/index.js';
+import chai from 'chai';
+
+import { fileURLToPath } from 'node:url';
+
+describe('plugins', () => {
+	// https://github.com/withastro/astro/issues/3264
+	it('should be able to get file path when passing fileURL', async () => {
+		let context;
+		await renderMarkdown(`test`, {
+			fileURL: new URL('virtual.md', import.meta.url),
+			remarkPlugins: [
+				function () {
+					const transformer = (tree, file) => {
+						context = file;
+					};
+
+					return transformer;
+				}
+			]
+		});
+
+		chai.expect(typeof context).to.equal('object');
+		chai.expect(context.path).to.equal(fileURLToPath(new URL('virtual.md', import.meta.url)));
+	});
+})