withastro · matthewp · Jul 28, 2022 · Jul 27, 2022
diff --git a/.changeset/silent-files-promise.md b/.changeset/silent-files-promise.md
@@ -0,0 +1,5 @@
+---
+'@astrojs/mdx': patch
+---
+
+Ensure file and url are always present in MDX for Astro.glob
diff --git a/packages/integrations/mdx/src/index.ts b/packages/integrations/mdx/src/index.ts
@@ -96,10 +96,14 @@ export default function mdx(mdxOptions: MdxOptions = {}): AstroIntegration {
 									// or otherwise refactored to not require copy-paste handling logic.
 									code += `\nimport "${'astro:scripts/page-ssr.js'}";`;
 
+									const { fileUrl, fileId } = getFileInfo(id, config);
 									if (!moduleExports.includes('url')) {
-										const { fileUrl } = getFileInfo(id, config);
 										code += `\nexport const url = ${JSON.stringify(fileUrl)};`;
 									}
+									if (!moduleExports.includes('file')) {
+										code += `\nexport const file = ${JSON.stringify(fileId)};`;
+									}
+
 									if (command === 'dev') {
 										// TODO: decline HMR updates until we have a stable approach
 										code += `\nif (import.meta.hot) {

diff --git a/packages/integrations/mdx/src/utils.ts b/packages/integrations/mdx/src/utils.ts
@@ -4,16 +4,34 @@ function appendForwardSlash(path: string) {
 	return path.endsWith('/') ? path : path + '/';
 }
 
+interface FileInfo {
+	fileId: string;
+	fileUrl: string;
+}
+
 /** @see 'vite-plugin-utils' for source */
-export function getFileInfo(id: string, config: AstroConfig) {
+export function getFileInfo(id: string, config: AstroConfig): FileInfo {
 	const sitePathname = appendForwardSlash(
 		config.site ? new URL(config.base, config.site).pathname : config.base
 	);
 
+	// Try to grab the file's actual URL
+	let url: URL | undefined = undefined;
+	try {
+		url = new URL(`file://${id}`);
+	} catch {}
+
 	const fileId = id.split('?')[0];
-	let fileUrl = fileId.includes('/pages/')
-		? fileId.replace(/^.*?\/pages\//, sitePathname).replace(/(\/index)?\.mdx$/, '')
-		: undefined;
+	let fileUrl: string;
+	const isPage = fileId.includes('/pages/');
+	if(isPage) {
+		fileUrl = fileId.replace(/^.*?\/pages\//, sitePathname).replace(/(\/index)?\.mdx$/, '');
+	} else if(url && url.pathname.startsWith(config.root.pathname)) {
+		fileUrl = url.pathname.slice(config.root.pathname.length);
+	} else {
+		fileUrl = fileId;
+	}
+
 	if (fileUrl && config.trailingSlash === 'always') {
 		fileUrl = appendForwardSlash(fileUrl);
 	}

diff --git a/packages/integrations/mdx/test/fixtures/mdx-get-static-paths/src/content/1.mdx b/packages/integrations/mdx/test/fixtures/mdx-get-static-paths/src/content/1.mdx
@@ -0,0 +1,5 @@
+---
+one: hello
+slug: one
+---
+First mdx file
diff --git a/packages/integrations/mdx/test/fixtures/mdx-get-static-paths/src/pages/[slug].astro b/packages/integrations/mdx/test/fixtures/mdx-get-static-paths/src/pages/[slug].astro
@@ -0,0 +1,34 @@
+---
+export const getStaticPaths = async () => {
+	const content = await Astro.glob('../content/*.mdx');
+
+	return content
+    .filter((page) => !page.frontmatter.draft) // skip drafts
+    .map(({ default: MdxContent, frontmatter, url, file }) => {
+        return {
+          params: { slug: frontmatter.slug || "index" },
+          props: {
+            MdxContent,
+						file,
+            frontmatter,
+						url
+          }
+        }
+     })
+}
+
+const { MdxContent, frontmatter, url, file } = Astro.props;
+---
+
+<html>
+	<head>
+		<title>Page</title>
+	</head>
+	<body>
+		<MdxContent />
+
+		<div id="one">{frontmatter.one}</div>
+		<div id="url">{url}</div>
+		<div id="file">{file}</div>
+	</body>
+</html>
diff --git a/packages/integrations/mdx/test/mdx-get-static-paths.test.js b/packages/integrations/mdx/test/mdx-get-static-paths.test.js
@@ -0,0 +1,29 @@
+import mdx from '@astrojs/mdx';
+
+import { expect } from 'chai';
+import { loadFixture } from '../../../astro/test/test-utils.js';
+import * as cheerio from 'cheerio';
+
+const FIXTURE_ROOT = new URL('./fixtures/mdx-get-static-paths', import.meta.url);
+
+describe('getStaticPaths', () => {
+	/** @type {import('astro/test/test-utils').Fixture} */
+	let fixture;
+	before(async () => {
+		fixture = await loadFixture({
+			root: FIXTURE_ROOT,
+			integrations: [mdx()],
+		});
+		await fixture.build();
+	});
+
+	it('Provides file and url', async () => {
+		const html = await fixture.readFile('/one/index.html');
+
+		const $ = cheerio.load(html);
+		expect($('p').text()).to.equal('First mdx file');
+		expect($('#one').text()).to.equal('hello', 'Frontmatter included');
+		expect($('#url').text()).to.equal('/src/content/1.mdx', 'url is included');
+		expect($('#file').text()).to.contain('fixtures/mdx-get-static-paths/src/content/1.mdx', 'file is included');
+	});
+});