Fix: correctly transform `import.meta.env.*` in MDX (#4858)

* fix: serialize route pattern for Netlify edge

Co-authored-by: Jackie Macharia <jackiewmacharia>

* fix: escape import.meta.env in MDX compiler output

* test: env vars in mdx

* chore: changeset

* deps: estree-util-visit, @types/estree

* feat: inject import.meta.env w/ recma

* feat: pull importMetaEnv from vite + astro configs

* test: `import.meta.env` in JSX

* fix: lockfile

* chore: update changeset

* fix: remove stray stashed commit

1 files changed, 58 insertions, 0 deletions

diff --git a/packages/integrations/mdx/test/mdx-vite-env-vars.test.js b/packages/integrations/mdx/test/mdx-vite-env-vars.test.js
new file mode 100644
index 000000000..9504b7305
--- /dev/null
+++ b/packages/integrations/mdx/test/mdx-vite-env-vars.test.js
@@ -0,0 +1,58 @@
+import { expect } from 'chai';
+import { parseHTML } from 'linkedom';
+import { loadFixture } from '../../../astro/test/test-utils.js';
+
+describe('MDX - Vite env vars', () => {
+	let fixture;
+	before(async () => {
+		fixture = await loadFixture({
+			root: new URL('./fixtures/mdx-vite-env-vars/', import.meta.url),
+		});
+		await fixture.build();
+	});
+
+	it('Avoids transforming `import.meta.env` outside JSX expressions', async () => {
+		const html = await fixture.readFile('/vite-env-vars/index.html');
+		const { document } = parseHTML(html);
+		
+		expect(document.querySelector('h1')?.innerHTML).to.contain('import.meta.env.SITE');
+		expect(document.querySelector('code')?.innerHTML).to.contain('import.meta.env.SITE');
+		expect(document.querySelector('pre')?.innerHTML).to.contain('import.meta.env.SITE');
+	});
+	it('Allows referencing `import.meta.env` in frontmatter', async () => {
+		const { title = '' } = JSON.parse(await fixture.readFile('/frontmatter.json'));
+		expect(title).to.contain('import.meta.env.SITE');
+	});
+	it('Transforms `import.meta.env` in {JSX expressions}', async () => {
+		const html = await fixture.readFile('/vite-env-vars/index.html');
+		const { document } = parseHTML(html);
+
+		expect(document.querySelector('[data-env-site]')?.innerHTML).to.contain(
+			'https://mdx-is-neat.com/blog/cool-post',
+		);
+	});
+	it('Transforms `import.meta.env` in variable exports', async () => {
+		const html = await fixture.readFile('/vite-env-vars/index.html');
+		const { document } = parseHTML(html);
+
+		expect(document.querySelector('[data-env-variable-exports]')?.innerHTML).to.contain(
+			'MODE works',
+		);
+	});
+	it('Transforms `import.meta.env` in HTML attributes', async () => {
+		const html = await fixture.readFile('/vite-env-vars/index.html');
+		const { document } = parseHTML(html);
+
+		const dataAttrDump = document.querySelector('[data-env-dump]');
+		expect(dataAttrDump).to.not.be.null; 
+
+		expect(dataAttrDump.getAttribute('data-env-prod')).to.not.be.null;
+		expect(dataAttrDump.getAttribute('data-env-dev')).to.be.null;
+		expect(dataAttrDump.getAttribute('data-env-base-url')).to.equal(
+			'/',
+		);
+		expect(dataAttrDump.getAttribute('data-env-mode')).to.equal(
+			'production',
+		);
+	});
+});