Add SmartyPants flag (#5769)

* feat: add smartypants flag

* test: smartypants in markdown and mdx

* docs: Smartypants -> SmartyPants

* chore: changeset

* chore: update changeset with 1.0 -> 2.0 in mind

* chore: bump to minor change

.changeset/angry-pots-boil.md

@@ -0,0 +1,34 @@
+---
+'astro': minor
+'@astrojs/mdx': minor
+'@astrojs/markdown-remark': minor
+---
+
+Introduce a `smartypants` flag to opt-out of Astro's default SmartyPants plugin.
+
+```js
+{
+  markdown: {
+    smartypants: false,
+  }
+}
+```
+
+  #### Migration
+
+  You may have disabled Astro's built-in plugins (GitHub-Flavored Markdown and Smartypants) with the `extendDefaultPlugins` option. This has now been split into 2 flags to disable each plugin individually:
+  - `markdown.gfm` to disable GitHub-Flavored Markdown
+  - `markdown.smartypants` to disable SmartyPants
+
+  ```diff
+  // astro.config.mjs
+  import { defineConfig } from 'astro/config';
+
+  export default defineConfig({
+    markdown: {
+  -   extendDefaultPlugins: false,
+  +   smartypants: false,
+  +   gfm: false,
+    }
+  });
+  ```

packages/astro/src/@types/astro.ts

@@ -785,6 +785,23 @@ export interface AstroUserConfig {
 		 * ```
 		 */
 		gfm?: boolean;
+		/**
+		 * @docs
+		 * @name markdown.smartypants
+		 * @type {boolean}
+		 * @default `true`
+		 * @description
+		 * Astro uses the [SmartyPants formatter](https://daringfireball.net/projects/smartypants/) by default. To disable this, set the `smartypants` flag to `false`:
+		 *
+		 * ```js
+		 * {
+		 *   markdown: {
+		 *     smartypants: false,
+		 *   }
+		 * }
+		 * ```
+		 */
+		smartypants?: boolean;
 		/**
 		 * @docs
 		 * @name markdown.remarkRehype

packages/astro/src/core/config/schema.ts

@@ -163,6 +163,7 @@ export const AstroConfigSchema = z.object({
 				.optional()
 				.default(ASTRO_CONFIG_DEFAULTS.markdown.remarkRehype),
 			gfm: z.boolean().default(ASTRO_CONFIG_DEFAULTS.markdown.gfm),
+			smartypants: z.boolean().default(ASTRO_CONFIG_DEFAULTS.markdown.smartypants),
 		})
 		.default({}),
 	vite: z

packages/astro/test/astro-markdown-plugins.test.js

@@ -47,25 +47,23 @@ describe('Astro Markdown plugins', () => {
 	});
 
 	// Asserts Astro 1.0 behavior is removed. Test can be removed in Astro 3.0.
-	it('Still applies GFM when user plugins are provided', async () => {
+	it('Still applies default plugins when user plugins are provided', async () => {
 		const fixture = await buildFixture({
 			markdown: {
 				remarkPlugins: [remarkExamplePlugin],
 				rehypePlugins: [[addClasses, { 'h1,h2,h3': 'title' }]],
 			},
 		});
-		const html = await fixture.readFile('/with-gfm/index.html');
-		const $ = cheerio.load(html);
-
-		// test 1: GFM autolink applied correctly
-		expect($('a[href="https://example.com"]')).to.have.lengthOf(1);
+		const gfmHtml = await fixture.readFile('/with-gfm/index.html');
+		const $1 = cheerio.load(gfmHtml);
+		expect($1('a[href="https://example.com"]')).to.have.lengthOf(1);
 
-		// test 2: remark plugins still applied
-		expect(html).to.include('Remark plugin applied!');
+		const smartypantsHtml = await fixture.readFile('/with-smartypants/index.html');
+		const $2 = cheerio.load(smartypantsHtml);
+		expect($2('p').html()).to.equal('“Smartypants” is — awesome');
 
-		// test 3: rehype plugins still applied
-		expect($('#github-flavored-markdown-test')).to.have.lengthOf(1);
-		expect($('#github-flavored-markdown-test').hasClass('title')).to.equal(true);
+		testRemark(gfmHtml);
+		testRehype(gfmHtml, '#github-flavored-markdown-test');
 	});
 
 	for (const gfm of [true, false]) {
@@ -87,12 +85,42 @@ describe('Astro Markdown plugins', () => {
 				expect($('a[href="https://example.com"]')).to.have.lengthOf(0);
 			}
 
-			// test 2: remark plugins still applied
-			expect(html).to.include('Remark plugin applied!');
+			testRemark(html);
+			testRehype(html, '#github-flavored-markdown-test');
+		});
+	}
+
+	for (const smartypants of [true, false]) {
+		it(`Handles SmartyPants when smartypants = ${smartypants}`, async () => {
+			const fixture = await buildFixture({
+				markdown: {
+					remarkPlugins: [remarkExamplePlugin],
+					rehypePlugins: [[addClasses, { 'h1,h2,h3': 'title' }]],
+					smartypants,
+				},
+			});
+			const html = await fixture.readFile('/with-smartypants/index.html');
+			const $ = cheerio.load(html);
+
+			// test 1: GFM autolink applied correctly
+			if (smartypants === true) {
+				expect($('p').html()).to.equal('“Smartypants” is — awesome');
+			} else {
+				expect($('p').html()).to.equal('"Smartypants" is -- awesome');
+			}
 
-			// test 3: rehype plugins still applied
-			expect($('#github-flavored-markdown-test')).to.have.lengthOf(1);
-			expect($('#github-flavored-markdown-test').hasClass('title')).to.equal(true);
+			testRemark(html);
+			testRehype(html, '#smartypants-test');
 		});
 	}
 });
+
+function testRehype(html, headingId) {
+	const $ = cheerio.load(html);
+	expect($(headingId)).to.have.lengthOf(1);
+	expect($(headingId).hasClass('title')).to.equal(true);
+}
+
+function testRemark(html) {
+	expect(html).to.include('Remark plugin applied!');
+}

packages/astro/test/fixtures/astro-markdown-plugins/src/pages/with-smartypants.md

@@ -0,0 +1,3 @@
+# Smartypants test
+
+"Smartypants" is -- awesome

packages/integrations/mdx/package.json

@@ -43,6 +43,7 @@
     "rehype-raw": "^6.1.1",
     "remark-frontmatter": "^4.0.1",
     "remark-gfm": "^3.0.1",
+    "remark-smartypants": "^2.0.0",
     "shiki": "^0.11.1",
     "unist-util-visit": "^4.1.0",
     "vfile": "^5.3.2"

packages/integrations/mdx/src/index.ts

@@ -186,6 +186,7 @@ function applyDefaultOptions({
 		recmaPlugins: options.recmaPlugins ?? defaults.recmaPlugins,
 		remarkRehype: options.remarkRehype ?? defaults.remarkRehype,
 		gfm: options.gfm ?? defaults.gfm,
+		smartypants: options.smartypants ?? defaults.smartypants,
 		remarkPlugins: options.remarkPlugins ?? defaults.remarkPlugins,
 		rehypePlugins: options.rehypePlugins ?? defaults.rehypePlugins,
 		shikiConfig: options.shikiConfig ?? defaults.shikiConfig,

packages/integrations/mdx/src/plugins.ts

@@ -14,6 +14,7 @@ import type { Image } from 'mdast';
 import { pathToFileURL } from 'node:url';
 import rehypeRaw from 'rehype-raw';
 import remarkGfm from 'remark-gfm';
+import remarkSmartypants from 'remark-smartypants';
 import { visit } from 'unist-util-visit';
 import type { VFile } from 'vfile';
 import { MdxOptions } from './index.js';
@@ -153,6 +154,9 @@ export async function getRemarkPlugins(
 	if (mdxOptions.gfm) {
 		remarkPlugins.push(remarkGfm);
 	}
+	if (mdxOptions.smartypants) {
+		remarkPlugins.push(remarkSmartypants);
+	}
 
 	remarkPlugins = [...remarkPlugins, ...ignoreStringPlugins(mdxOptions.remarkPlugins)];
 

packages/integrations/mdx/test/fixtures/mdx-plugins/src/pages/with-plugins.mdx

@@ -21,3 +21,5 @@ Oh cool, more text!
 And section 2, with a hyperlink to check GFM is preserved: https://handle-me-gfm.com
 
 <div data-recma-plugin-works={recmaPluginWorking}></div>
+
+> "Smartypants" is -- awesome

packages/integrations/mdx/test/mdx-plugins.test.js

@@ -36,6 +36,19 @@ describe('MDX plugins', () => {
 		expect(selectGfmLink(document)).to.not.be.null;
 	});
 
+	it('Applies SmartyPants by default', async () => {
+		const fixture = await buildFixture({
+			integrations: [mdx()],
+		});
+
+		const html = await fixture.readFile(FILE);
+		const { document } = parseHTML(html);
+
+		const quote = selectSmartypantsQuote(document);
+		expect(quote).to.not.be.null;
+		expect(quote.textContent).to.contain('“Smartypants” is — awesome');
+	});
+
 	it('supports custom rehype plugins', async () => {
 		const fixture = await buildFixture({
 			integrations: [
@@ -88,6 +101,7 @@ describe('MDX plugins', () => {
 					markdown: {
 						remarkPlugins: [remarkToc],
 						gfm: false,
+						smartypants: false,
 					},
 					integrations: [
 						mdx({
@@ -129,6 +143,23 @@ describe('MDX plugins', () => {
 					expect(selectGfmLink(document), 'Respects `markdown.gfm` unexpectedly.').to.not.be.null;
 				}
 			});
+
+			it('Handles smartypants', async () => {
+				const html = await fixture.readFile(FILE);
+				const { document } = parseHTML(html);
+
+				const quote = selectSmartypantsQuote(document);
+
+				if (extendMarkdownConfig === true) {
+					expect(quote.textContent, 'Does not respect `markdown.smartypants` option.').to.contain(
+						'"Smartypants" is -- awesome'
+					);
+				} else {
+					expect(quote.textContent, 'Respects `markdown.smartypants` unexpectedly.').to.contain(
+						'“Smartypants” is — awesome'
+					);
+				}
+			});
 		});
 	}
 
@@ -202,6 +233,10 @@ function selectGfmLink(document) {
 	return document.querySelector('a[href="https://handle-me-gfm.com"]');
 }
 
+function selectSmartypantsQuote(document) {
+	return document.querySelector('blockquote');
+}
+
 function selectRemarkExample(document) {
 	return document.querySelector('div[data-remark-plugin-works]');
 }

packages/markdown/remark/package.json

@@ -43,6 +43,7 @@
     "remark-gfm": "^3.0.1",
     "remark-parse": "^10.0.1",
     "remark-rehype": "^10.1.0",
+    "remark-smartypants": "^2.0.0",
     "shiki": "^0.11.1",
     "unified": "^10.1.2",
     "unist-util-map": "^3.1.1",

packages/markdown/remark/src/index.ts

@@ -24,6 +24,7 @@ import remarkUnwrap from './remark-unwrap.js';
 import rehypeRaw from 'rehype-raw';
 import rehypeStringify from 'rehype-stringify';
 import remarkGfm from 'remark-gfm';
+import remarkSmartypants from 'remark-smartypants';
 import markdown from 'remark-parse';
 import markdownToHtml from 'remark-rehype';
 import { unified } from 'unified';
@@ -43,6 +44,7 @@ export const markdownConfigDefaults: Omit<Required<AstroMarkdownOptions>, 'draft
 	rehypePlugins: [],
 	remarkRehype: {},
 	gfm: true,
+	smartypants: true,
 };
 
 /** Shared utility for rendering markdown */
@@ -58,6 +60,7 @@ export async function renderMarkdown(
 		rehypePlugins = markdownConfigDefaults.rehypePlugins,
 		remarkRehype = markdownConfigDefaults.remarkRehype,
 		gfm = markdownConfigDefaults.gfm,
+		smartypants = markdownConfigDefaults.smartypants,
 		isAstroFlavoredMd = false,
 		isExperimentalContentCollections = false,
 		contentDir,
@@ -75,6 +78,10 @@ export async function renderMarkdown(
 		parser.use(remarkGfm);
 	}
 
+	if (smartypants) {
+		parser.use(remarkSmartypants);
+	}
+
 	const loadedRemarkPlugins = await Promise.all(loadPlugins(remarkPlugins));
 	const loadedRehypePlugins = await Promise.all(loadPlugins(rehypePlugins));
 

packages/markdown/remark/src/types.ts

@@ -48,6 +48,7 @@ export interface AstroMarkdownOptions {
 	rehypePlugins?: RehypePlugins;
 	remarkRehype?: RemarkRehype;
 	gfm?: boolean;
+	smartypants?: boolean;
 }
 
 export interface MarkdownRenderingOptions extends AstroMarkdownOptions {