[MDX] Fix remaining inconsistencies with Markdown (#4268)

* feat: add "file" and "url" to layout props

* feat: add rawContent and compiledContent errs

* fix: add "file" and "url" to frontmatter

* fix: add separate MDX instance type

* types: add MarkdownLayoutProps and MDXLayoutProps

* refactor: simplify MDXLayoutProps

* test: pass file and url to layout

* test: glob components with .default and Content

* feat: add <Content /> to MDX

* feat: declare MDX type module

* fix: [MD] move file and url to layout props only

* chore: changeset

* chore: bump MDX to "minor" with more details

* refactor: remove "file" + "url" top-level props (save for minor)

* revert: MDInstance type def updates (save for minor)

* fix: MDXInstance "default" + "content" types

* fix: bad test layout

* chore: remove getHeaders fro *.mdx

1 files changed, 11 insertions, 0 deletions

diff --git a/packages/integrations/mdx/test/mdx-frontmatter.test.js b/packages/integrations/mdx/test/mdx-frontmatter.test.js
index e69919bd5..9f0e9d8e6 100644
--- a/packages/integrations/mdx/test/mdx-frontmatter.test.js
+++ b/packages/integrations/mdx/test/mdx-frontmatter.test.js
@@ -56,4 +56,15 @@ describe('MDX frontmatter', () => {
 		expect(headingSlugs).to.contain('section-1');
 		expect(headingSlugs).to.contain('section-2');
 	});
+
+	it('passes "file" and "url" to layout via frontmatter', async () => {
+		const html = await fixture.readFile('/with-headings/index.html');
+		const { document } = parseHTML(html);
+
+		const frontmatterFile = document.querySelector('[data-frontmatter-file]')?.textContent;
+		const frontmatterUrl = document.querySelector('[data-frontmatter-url]')?.textContent;
+
+		expect(frontmatterFile?.endsWith('with-headings.mdx')).to.equal(true, '"file" prop does not end with correct path or is undefined');
+		expect(frontmatterUrl).to.equal('/with-headings');
+	});
 });