Change frontmatter injection ordering (#5687)

* feat: make user frontmatter accessible in md

* test: new frontmatter injection

* refactor: move injection utils to remark pkg

* fix: add dist/internal to remark exports

* feat: update frontmater injection in mdx

* tests: new mdx injection

* chore: changeset

* chore: simplify frontmatter destructuring

* fix: remove old _internal references

* refactor: injectedFrontmatter -> remarkPluginFrontmatter

* docs: add content collections change

* chore: changeset heading levels

1 files changed, 4 insertions, 7 deletions

diff --git a/packages/integrations/mdx/test/mdx-frontmatter-injection.test.js b/packages/integrations/mdx/test/mdx-frontmatter-injection.test.js
index 780f7252c..8f598b78e 100644
--- a/packages/integrations/mdx/test/mdx-frontmatter-injection.test.js
+++ b/packages/integrations/mdx/test/mdx-frontmatter-injection.test.js
@@ -33,14 +33,11 @@ describe('MDX frontmatter injection', () => {
 		}
 	});
 
-	it('overrides injected frontmatter with user frontmatter', async () => {
+	it('allow user frontmatter mutation', async () => {
 		const frontmatterByPage = JSON.parse(await fixture.readFile('/glob.json'));
-		const readingTimes = frontmatterByPage.map(
-			(frontmatter = {}) => frontmatter.injectedReadingTime?.text
-		);
-		const titles = frontmatterByPage.map((frontmatter = {}) => frontmatter.title);
-		expect(titles).to.contain('Overridden title');
-		expect(readingTimes).to.contain('1000 min read');
+		const descriptions = frontmatterByPage.map((frontmatter = {}) => frontmatter.description);
+		expect(descriptions).to.contain('Processed by remarkDescription plugin: Page 1 description');
+		expect(descriptions).to.contain('Processed by remarkDescription plugin: Page 2 description');
 	});
 
 	it('passes injected frontmatter to layouts', async () => {