[MDX] Add Prism and Shiki support (#4002)

* deps: add rehype-prism, shiki, rehype-pretty-code

* wip: apply rehype plugins depending on config

* wip: cherry-pick jsx-runtime fix?

* deps: rehype-pretty-code -> shiki-twoslash, add rehype-raw

* wip: add jsx-runtime fix

* feat: get shiki working!

* deps: add @astrojs/prism, prismjs, unist-util-visit

* feat: add prism support

* example: add small syntax highlight demo to with-mdx

* deps: remove rehype-prism

* chore: remove unused async

* chore: add .test.js to all mdx tests

* test: shiki, shikiConfig, prism

* fix: remove "is:raw" from prism output

* docs: add syntax highlighting section

* chore: add changeset

* nit: "Shiki config" -> Shiki config

Co-authored-by: Sarah Rainsberger <sarah@rainsberger.ca>

* Revert "wip: add jsx-runtime fix"

This reverts commit 07f4528f449281afb7bbc154b09292244795a183.

* docs: link to integration README from example

Co-authored-by: Nate Moore <nate@astro.build>
Co-authored-by: Sarah Rainsberger <sarah@rainsberger.ca>

1 files changed, 67 insertions, 0 deletions

diff --git a/packages/integrations/mdx/test/mdx-syntax-highlighting.test.js b/packages/integrations/mdx/test/mdx-syntax-highlighting.test.js
new file mode 100644
index 000000000..d2bbb9266
--- /dev/null
+++ b/packages/integrations/mdx/test/mdx-syntax-highlighting.test.js
@@ -0,0 +1,67 @@
+import mdx from '@astrojs/mdx';
+
+import { expect } from 'chai';
+import { parseHTML } from 'linkedom';
+import { loadFixture } from '../../../astro/test/test-utils.js';
+
+const FIXTURE_ROOT = new URL('./fixtures/mdx-syntax-hightlighting/', import.meta.url);
+
+describe('MDX syntax highlighting', () => {
+	describe('shiki', () => {
+		it('works', async () => {
+			const fixture = await loadFixture({
+				root: FIXTURE_ROOT,
+				markdown: {
+					syntaxHighlight: 'shiki',
+				},
+				integrations: [mdx()],
+			});
+			await fixture.build();
+	
+			const html = await fixture.readFile('/index.html');
+			const { document } = parseHTML(html);
+	
+			const shikiCodeBlock = document.querySelector('pre.shiki');
+			expect(shikiCodeBlock).to.not.be.null;
+		});
+
+		it('respects markdown.shikiConfig.theme', async () => {
+			const fixture = await loadFixture({
+				root: FIXTURE_ROOT,
+				markdown: {
+					syntaxHighlight: 'shiki',
+					shikiConfig: {
+						theme: 'dracula',
+					},
+				},
+				integrations: [mdx()],
+			});
+			await fixture.build();
+	
+			const html = await fixture.readFile('/index.html');
+			const { document } = parseHTML(html);
+	
+			const shikiCodeBlock = document.querySelector('pre.shiki.dracula');
+			expect(shikiCodeBlock).to.not.be.null;
+		});
+	});
+
+	describe('prism', () => {
+		it('works', async () => {
+			const fixture = await loadFixture({
+				root: FIXTURE_ROOT,
+				markdown: {
+					syntaxHighlight: 'prism',
+				},
+				integrations: [mdx()],
+			});
+			await fixture.build();
+	
+			const html = await fixture.readFile('/index.html');
+			const { document } = parseHTML(html);
+	
+			const prismCodeBlock = document.querySelector('pre.language-astro');
+			expect(prismCodeBlock).to.not.be.null;
+		});
+	});
+});