[MDX] Extend Markdown plugin config, with customization options (#4504)

* test: new combined remark / rehype suite

* fix: use with-plugins fixture

* chore: remove old mdx plugin tests

* docs: add JS docs

* docs: update README with thorough example

* chore: changeset

* fix: add "extends" error message

* fix: ignore string-based plugins in md

* feat: add warning log for string plugins

* docs: highlight `extendPlugins`

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

* nit: highlight "extendPlugins"

* fix: md plugins type check

* chore: "defaults" -> "astroDefaults"

* nit: info log when inheriting markdown plugins

* refactor: one big log on new behavior

* dan: dan nit

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

1 files changed, 0 insertions, 70 deletions

diff --git a/packages/integrations/mdx/test/mdx-rehype-plugins.test.js b/packages/integrations/mdx/test/mdx-rehype-plugins.test.js
deleted file mode 100644
index 17430c750..000000000
--- a/packages/integrations/mdx/test/mdx-rehype-plugins.test.js
+++ /dev/null
@@ -1,70 +0,0 @@
-import mdx from '@astrojs/mdx';
-
-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';
-
-function rehypeReadingTime() {
-	return function (tree, { data }) {
-		const readingTime = getReadingTime(toString(tree));
-		tree.children.unshift(
-			jsToTreeNode(`export const readingTime = ${JSON.stringify(readingTime)}`)
-		);
-	};
-}
-
-const FIXTURE_ROOT = new URL('./fixtures/mdx-rehype-plugins/', import.meta.url);
-
-describe('MDX rehype plugins', () => {
-	describe('without "extends"', () => {
-		let fixture;
-		before(async () => {
-			fixture = await loadFixture({
-				root: FIXTURE_ROOT,
-				integrations: [
-					mdx({
-						rehypePlugins: [rehypeReadingTime],
-					}),
-				],
-			});
-			await fixture.build();
-		});
-
-		it('supports custom rehype plugins - reading time', async () => {
-			const { readingTime } = JSON.parse(await fixture.readFile('/reading-time.json'));
-
-			expect(readingTime).to.not.be.null;
-			expect(readingTime.text).to.match(/^\d+ min read/);
-		});
-	});
-
-	describe('with "extends"', () => {
-		let fixture;
-		before(async () => {
-			fixture = await loadFixture({
-				root: FIXTURE_ROOT,
-				integrations: [
-					mdx({
-						rehypePlugins: { extends: [rehypeReadingTime] },
-					}),
-				],
-			});
-			await fixture.build();
-		});
-
-		it('preserves default getHeadings', async () => {
-			const html = await fixture.readFile('/space-ipsum/index.html');
-			const { document } = parseHTML(html);
-
-			const headings = [...document.querySelectorAll('h1, h2')];
-			expect(headings.length).to.be.greaterThan(0);
-			for (const heading of headings) {
-				expect(heading.id).to.not.be.empty;
-			}
-		});
-	});
-});