Frontmatter injection for MD and MDX (#4176)

* feat: inject vfile data as exports

* feat: add vfile to renderMarkdown output

* feat: add safe astroExports parser to utils

* refactor: expose vite-plugin-utils on astro package

* feat: handle astroExports in mdx

* deps: vfile

* chore: lockfile

* test: astroExports in mdx

* refactor: merge plugin exports into forntmatter

* refactor: astroExports -> astro.frontmatter

* refactor: md astroExports -> astro.frontmatter

* feat: astro.frontmatter vite-plugin-markdown

* chore: remove unused import

* fix: inline safelyGetAstroData in MDX integration

* chore: check that frontmatter export is valid export name

* chore: error log naming

* test: mdx remark frontmatter injection

* fix: inconsistent shiki mod resolution

* fix: add new frontmatter and heading props

* test: remark vdata

* fix: spread astro.data.frontmatter

* test deps: mdast-util-to-string, reading-time

* fix: astro-md test package name

* test: md frontmatter injection

* fix: layouts

* deps: remove vite-plugin-utils export

* fix: package lock

* chore: remove dup import

* chore: changeset

* chore: add comment on safelyGetAstroData source

* deps: move mdast-util-to-string + reading-time to test fixture

* chore: move remark plugins to test fixture

* fix: override plugin frontmatter with user frontmatter

* test: md injected frontmatter overrides

* test: frontmatter injection overrides mdx

1 files changed, 6 insertions, 6 deletions

diff --git a/packages/integrations/mdx/test/mdx-rehype-plugins.test.js b/packages/integrations/mdx/test/mdx-rehype-plugins.test.js
index d8761b9fb..d60c09a07 100644
--- a/packages/integrations/mdx/test/mdx-rehype-plugins.test.js
+++ b/packages/integrations/mdx/test/mdx-rehype-plugins.test.js
@@ -1,15 +1,15 @@
 import mdx from '@astrojs/mdx';
-import { jsToTreeNode } from '../dist/utils.js';
 
-import { expect } from 'chai';
-import { parseHTML } from 'linkedom';
 import getReadingTime from 'reading-time';
 import { toString } from 'mdast-util-to-string';
+import { expect } from 'chai';
+import { parseHTML } from 'linkedom';
+import { jsToTreeNode } from '../dist/utils.js';
 
 import { loadFixture } from '../../../astro/test/test-utils.js';
 
-export function rehypeReadingTime() {
-	return function (tree) {
+function rehypeReadingTime() {
+	return function (tree, { data }) {
 		const readingTime = getReadingTime(toString(tree));
 		tree.children.unshift(
 			jsToTreeNode(`export const readingTime = ${JSON.stringify(readingTime)}`)
@@ -46,7 +46,7 @@ describe('MDX rehype plugins', () => {
 		});
 
 		it('supports custom rehype plugins - reading time', async () => {
-			const readingTime = JSON.parse(await fixture.readFile('/reading-time.json'));
+			const { readingTime } = JSON.parse(await fixture.readFile('/reading-time.json'));
 
 			expect(readingTime).to.not.be.null;
 			expect(readingTime.text).to.match(/^\d+ min read/);