feat(tailwind): support v4 (#13049)

Co-authored-by: HiDeoo <[email protected]>
Co-authored-by: Sarah Rainsberger <[email protected]>

.changeset/curvy-penguins-act.md

@@ -0,0 +1,9 @@
+---
+'@astrojs/tailwind': major
+---
+
+Deprecates the integration
+
+Tailwind CSS now offers a Vite plugin which is the preferred way to use Tailwind 4 in Astro. Please uninstall `@astrojs/tailwind` and follow the [Tailwind documentation for manual installation](https://tailwindcss.com/docs/installation/framework-guides/astro).
+
+This updated major version is only provided as a convenience for existing projects until they are able to migrate to the new plugin. It offers no additional functionality and is no longer recommended, but may continue to be used in your projects until it is removed entirely.

.changeset/four-chairs-exercise.md

@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+Updates `astro add tailwind` to add the `@tailwindcss/vite` plugin instead of the `@astrojs/tailwind` integration

examples/with-tailwindcss/astro.config.mjs

@@ -1,8 +1,10 @@
 // @ts-check
 import { defineConfig } from 'astro/config';
-import tailwind from '@astrojs/tailwind';
+import tailwindcss from '@tailwindcss/vite';
 
 // https://astro.build/config
 export default defineConfig({
-	integrations: [tailwind()],
+	vite: {
+		plugins: [tailwindcss()]
+	}
 });

examples/with-tailwindcss/package.json

@@ -11,12 +11,10 @@
   },
   "dependencies": {
     "@astrojs/mdx": "^4.0.7",
-    "@astrojs/tailwind": "^5.1.5",
+    "@tailwindcss/vite": "^4.0.0",
     "@types/canvas-confetti": "^1.9.0",
     "astro": "^5.1.10",
-    "autoprefixer": "^10.4.20",
     "canvas-confetti": "^1.9.3",
-    "postcss": "^8.5.1",
-    "tailwindcss": "^3.4.17"
+    "tailwindcss": "^4.0.0"
   }
 }

examples/with-tailwindcss/src/layouts/main.astro

@@ -1,4 +1,5 @@
 ---
+import '../styles/global.css';
 const { content } = Astro.props;
 ---
 

examples/with-tailwindcss/src/pages/index.astro

@@ -1,4 +1,5 @@
 ---
+import '../styles/global.css';
 // Component Imports
 import Button from '../components/Button.astro';
 

examples/with-tailwindcss/src/styles/global.css

@@ -0,0 +1 @@
+@import "tailwindcss";

packages/astro/e2e/fixtures/tailwindcss/astro.config.mjs

@@ -1,19 +1,13 @@
-import { fileURLToPath } from 'node:url';
-import tailwind from '@astrojs/tailwind';
 import { defineConfig } from 'astro/config';
+import tailwindcss from '@tailwindcss/vite';
 
 // https://astro.build/config
 export default defineConfig({
-	integrations: [
-		tailwind({
-			configFile: fileURLToPath(new URL('./tailwind.config.js', import.meta.url)),
-			applyBaseStyles: false
-		}),
-	],
 	devToolbar: {
 		enabled: false,
 	},
 	vite: {
+		plugins: [tailwindcss()],
 		build: {
 			assetsInlineLimit: 0,
 		},

packages/astro/e2e/fixtures/tailwindcss/package.json

@@ -4,9 +4,8 @@
   "private": true,
   "dependencies": {
     "@astrojs/tailwind": "workspace:*",
+    "@tailwindcss/vite": "^4.0.0",
     "astro": "workspace:*",
-    "autoprefixer": "^10.4.20",
-    "postcss": "^8.5.1",
-    "tailwindcss": "^3.4.17"
+    "tailwindcss": "^4.0.0"
   }
 }

packages/astro/e2e/fixtures/tailwindcss/src/pages/index.astro

@@ -1,4 +1,5 @@
 ---
+import '../styles/global.css';
 import Button from '../components/Button.astro';
 import Complex from '../components/Complex.astro';
 // Component Imports

packages/astro/e2e/fixtures/tailwindcss/src/styles/global.css

@@ -0,0 +1,7 @@
+@import 'tailwindcss';
+
+@theme {
+    --color-dawn: #f3e9fa;
+    --color-dusk: #514375;
+    --color-midnight: #31274a;
+}

packages/astro/e2e/tailwindcss.test.js

@@ -43,7 +43,7 @@ test.describe('Tailwind CSS', () => {
 		await expect(button, 'should have bg-purple-600').toHaveClass(/bg-purple-600/);
 		await expect(button, 'should have background color').toHaveCSS(
 			'background-color',
-			'rgb(147, 51, 234)',
+			'oklch(0.558 0.288 302.321)',
 		);
 
 		await expect(button, 'should have lg:py-3').toHaveClass(/lg:py-3/);
@@ -66,7 +66,7 @@ test.describe('Tailwind CSS', () => {
 		await expect(button, 'should have bg-purple-400').toHaveClass(/bg-purple-400/);
 		await expect(button, 'should have background color').toHaveCSS(
 			'background-color',
-			'rgb(192, 132, 252)',
+			'oklch(0.714 0.203 305.504)',
 		);
 	});
 });

packages/astro/src/cli/add/index.ts

@@ -51,14 +51,7 @@ const ALIASES = new Map([
 
 const STUBS = {
 	ASTRO_CONFIG: `import { defineConfig } from 'astro/config';\n// https://astro.build/config\nexport default defineConfig({});`,
-	TAILWIND_CONFIG: `/** @type {import('tailwindcss').Config} */
-export default {
-	content: ['./src/**/*.{astro,html,js,jsx,md,mdx,svelte,ts,tsx,vue}'],
-	theme: {
-		extend: {},
-	},
-	plugins: [],
-}\n`,
+	TAILWIND_GLOBAL_CSS: `@import "tailwindcss";`,
 	SVELTE_CONFIG: `\
 import { vitePreprocess } from '@astrojs/svelte';
 
@@ -154,23 +147,28 @@ export async function add(names: string[], { flags }: AddOptions) {
 	switch (installResult) {
 		case UpdateResult.updated: {
 			if (integrations.find((integration) => integration.id === 'tailwind')) {
-				await setupIntegrationConfig({
-					root,
-					logger,
+				const dir = new URL('./styles/', new URL(userConfig.srcDir ?? './src/', root));
+				const styles = new URL('./global.css', dir);
+				if (!existsSync(styles)) {
+					logger.info(
+						'SKIP_FORMAT',
+						`\n  ${magenta(`Astro will scaffold ${green('./src/styles/global.css')}.`)}\n`,
+					);
 
-					flags,
-					integrationName: 'Tailwind',
-					possibleConfigFiles: [
-						'./tailwind.config.cjs',
-						'./tailwind.config.mjs',
-						'./tailwind.config.ts',
-						'./tailwind.config.mts',
-						'./tailwind.config.cts',
-						'./tailwind.config.js',
-					],
-					defaultConfigFile: './tailwind.config.mjs',
-					defaultConfigContent: STUBS.TAILWIND_CONFIG,
-				});
+					if (await askToContinue({ flags })) {
+						if (!existsSync(dir)) {
+							await fs.mkdir(dir);
+						}
+						await fs.writeFile(styles, STUBS.TAILWIND_GLOBAL_CSS, 'utf-8');
+					} else {
+						logger.info(
+							'SKIP_FORMAT',
+							`\n  @astrojs/tailwind requires additional configuration. Please refer to https://docs.astro.build/en/guides/integrations-guide/tailwind/`,
+						);
+					}
+				} else {
+					logger.debug('add', `Using existing tailwind configuration`);
+				}
 			}
 			if (integrations.find((integration) => integration.id === 'svelte')) {
 				await setupIntegrationConfig({
@@ -290,6 +288,8 @@ export async function add(names: string[], { flags }: AddOptions) {
 						)}`,
 					);
 				}
+			} else if (integration.id === 'tailwind') {
+				addVitePlugin(mod, 'tailwindcss', '@tailwindcss/vite');
 			} else {
 				addIntegration(mod, integration);
 			}
@@ -358,6 +358,7 @@ export async function add(names: string[], { flags }: AddOptions) {
 					} to your project:\n${list}`,
 				),
 			);
+			logger.info('SKIP_FORMAT', msg.success("Import './src/styles/global.css' in a layout"));
 		}
 	}
 
@@ -456,6 +457,31 @@ function addIntegration(mod: ProxifiedModule<any>, integration: IntegrationInfo)
 	}
 }
 
+function addVitePlugin(mod: ProxifiedModule<any>, pluginId: string, packageName: string) {
+	const config = getDefaultExportOptions(mod);
+
+	if (!mod.imports.$items.some((imp) => imp.local === pluginId)) {
+		mod.imports.$append({
+			imported: 'default',
+			local: pluginId,
+			from: packageName,
+		});
+	}
+
+	config.vite ??= {};
+	config.vite.plugins ??= [];
+	if (
+		!config.vite.plugins.$ast.elements.some(
+			(el: ASTNode) =>
+				el.type === 'CallExpression' &&
+				el.callee.type === 'Identifier' &&
+				el.callee.name === pluginId,
+		)
+	) {
+		config.vite.plugins.push(builders.functionCall(pluginId));
+	}
+}
+
 export function setAdapter(
 	mod: ProxifiedModule<any>,
 	adapter: IntegrationInfo,
@@ -796,6 +822,13 @@ async function validateIntegrations(integrations: string[]): Promise<Integration
 					);
 				}
 
+				if (integration === 'tailwind') {
+					dependencies = [
+						['@tailwindcss/vite', '^4.0.0'],
+						['tailwindcss', '^4.0.0'],
+					];
+				}
+
 				return { id: integration, packageName, dependencies, type: integrationType };
 			}),
 		);

packages/astro/test/fixtures/astro-scripts/astro.config.mjs

@@ -1,11 +1,8 @@
-import { fileURLToPath } from 'node:url';
-import tailwind from '@astrojs/tailwind';
 import { defineConfig } from 'astro/config';
+import tailwindcss from '@tailwindcss/vite';
 
 export default defineConfig({
-	integrations: [
-		tailwind({
-			configFile: fileURLToPath(new URL('./tailwind.config.cjs', import.meta.url)),
-		}),
-	],
+	vite: {
+		plugins: [tailwindcss()]
+	}
 });

packages/astro/test/fixtures/astro-scripts/package.json

@@ -4,6 +4,7 @@
   "private": true,
   "dependencies": {
     "astro": "workspace:*",
-    "@astrojs/tailwind": "workspace:*"
+    "@tailwindcss/vite": "^4.0.0",
+    "tailwindcss": "^4.0.0"
   }
 }

packages/astro/test/fixtures/astro-scripts/src/external-page.astro

@@ -1,4 +1,5 @@
 ---
+import './styles/global.css';
 ---
 
 <html lang="en">

packages/astro/test/fixtures/astro-scripts/src/pages/external-no-hoist-classic.astro

@@ -1,4 +1,5 @@
 ---
+import '../styles/global.css';
 import NoHoistClassic from '../components/NoHoistClassic.astro';
 ---
 

packages/astro/test/fixtures/astro-scripts/src/pages/external-no-hoist.astro

@@ -1,4 +1,5 @@
 ---
+import '../styles/global.css';
 import NoHoistModule from '../components/NoHoistModule.astro';
 ---
 

packages/astro/test/fixtures/astro-scripts/src/pages/external.astro

@@ -1,4 +1,5 @@
 ---
+import '../styles/global.css';
 import Widget from '../components/Widget.astro';
 import Widget2 from '../components/Widget2.astro';
 ---

packages/astro/test/fixtures/astro-scripts/src/pages/glob.astro

@@ -1,4 +1,5 @@
 ---
+import '../styles/global.css';
 const components = await Astro.glob('/src/components/Glob/*');
 const MyComponent = components[0].default;
 ---

packages/astro/test/fixtures/astro-scripts/src/pages/inline-in-page.astro

@@ -1,3 +1,6 @@
+---
+import '../styles/global.css';
+---
 
 <html>
 <head>

packages/astro/test/fixtures/astro-scripts/src/pages/inline.astro

@@ -1,4 +1,5 @@
 ---
+import '../styles/global.css';
 import Inline from '../components/Inline.astro';
 ---
 

packages/astro/test/fixtures/astro-scripts/src/pages/with-styles.astro

@@ -1,3 +1,6 @@
+---
+import '../styles/global.css';
+---
 
 <html>
 	<head>

packages/astro/test/fixtures/astro-scripts/src/styles/global.css

@@ -0,0 +1 @@
+@import 'tailwindcss';

packages/astro/test/fixtures/middleware-tailwind/astro.config.mjs

@@ -1,12 +1,9 @@
-import { fileURLToPath } from 'node:url';
-import tailwind from '@astrojs/tailwind';
 import { defineConfig } from 'astro/config';
+import tailwindcss from "@tailwindcss/vite"
 
 // https://astro.build/config
 export default defineConfig({
-	integrations: [
-		tailwind({
-			configFile: fileURLToPath(new URL('./tailwind.config.cjs', import.meta.url)),
-		}),
-	],
+	vite: {
+		plugins: [tailwindcss()],
+	}
 });

packages/astro/test/fixtures/middleware-tailwind/package.json

@@ -4,6 +4,7 @@
   "private": true,
   "dependencies": {
     "astro": "workspace:*",
-    "@astrojs/tailwind": "workspace:*"
+    "@tailwindcss/vite": "^4.0.0",
+    "tailwindcss": "^4.0.0"
   }
 }

packages/astro/test/fixtures/middleware-tailwind/src/pages/index.astro

@@ -1,3 +1,7 @@
+---
+import '../styles/global.css';
+---
+
 <h1 class="text-blue-500 text-2xl font-bold">Hello world</h1>
 
 <style>

packages/astro/test/fixtures/middleware-tailwind/src/styles/global.css

@@ -0,0 +1 @@
+@import 'tailwindcss';