Extract Astro styles to external stylesheets (#43)

* Extract Astro styles to external stylesheets

* Require relative URLs in Markdown layouts

.eslintrc.cjs

@@ -3,12 +3,15 @@ module.exports = {
   extends: ['plugin:@typescript-eslint/recommended', 'prettier'],
   plugins: ['@typescript-eslint', 'prettier'],
   rules: {
+    '@typescript-eslint/ban-ts-comment': 'warn',
     '@typescript-eslint/camelcase': 'off',
     '@typescript-eslint/explicit-module-boundary-types': 'off',
     '@typescript-eslint/no-use-before-define': 'off',
     '@typescript-eslint/no-var-requires': 'off',
+    'no-shadow': 'warn',
     'prettier/prettier': 'error',
     'prefer-const': 'off',
     'prefer-rest-params': 'off',
+    'require-jsdoc': 'warn',
   },
 };

.github/workflows/nodejs.yml

@@ -27,3 +27,10 @@ jobs:
           npm test
         env:
           CI: true
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions/setup-node@v1
+      - run: npm ci
+      - run: npm run lint

examples/snowpack/astro/pages/concepts/build-pipeline.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: The Build Pipeline
 description: Snowpack Build creates a production-ready website with or without a bundler
 ---

examples/snowpack/astro/pages/concepts/dev-server.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: The Dev Server
 description: Snowpack's dev server is fast because it only rebuilds the files you change. Powered by ESM (ES modules).
 ---

examples/snowpack/astro/pages/concepts/hot-module-replacement.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: HMR + Fast Refresh
 description: Snowpack's ESM-powered unbundled development means near-instant single file builds that only take 10-25ms to load and update in the browser.
 ---

examples/snowpack/astro/pages/concepts/how-snowpack-works.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: How Snowpack Works
 description: Snowpack serves your application unbundled during development. Each file is built only once and is cached until it changes.
 ---

examples/snowpack/astro/pages/guides/babel.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: 'Babel'
 tags: communityGuide
 published: true

examples/snowpack/astro/pages/guides/connecting-tools.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: The Snowpack Guide to connecting your favorite tools
 description: 'How do you use your favorite tools in Snowpack? This Guide will help you get started'
 published: true

examples/snowpack/astro/pages/guides/hmr.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: Hot Module Replacement (HMR)
 description: Enable Snowpack's Hot Module Replacement (HMR) on your development server.
 published: false

examples/snowpack/astro/pages/guides/https-ssl-certificates.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: SSL Certificates
 description: How to use HTTPs during development and generate SSL certifcates for your Snowpack build.
 ---

examples/snowpack/astro/pages/guides/jest.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: 'Jest'
 tags: communityGuide
 img: '/img/logos/jest.svg'

examples/snowpack/astro/pages/guides/optimize-and-bundle.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: Optimize & Bundle for Production
 published: true
 description: How to optimize your Snowpack build for production, with or without a bundler.

examples/snowpack/astro/pages/guides/plugins.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: Creating Your Own Plugin
 description: Learn the basics of our Plugin API through working examples.
 ---

examples/snowpack/astro/pages/guides/postcss.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: 'PostCSS'
 tags: communityGuide
 published: true

examples/snowpack/astro/pages/guides/preact.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: Preact
 tags: communityGuide
 img: '/img/logos/preact.svg'

examples/snowpack/astro/pages/guides/react-global-imports.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: React + babel-plugin-import-global
 published: false
 ---

examples/snowpack/astro/pages/guides/react-loadable-components.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: React + Loadable Components
 published: false
 ---

examples/snowpack/astro/pages/guides/routing.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: Routing
 published: true
 description: This guide will walk you through some common routing scenarios and how to configure the routes option to support them in development.

examples/snowpack/astro/pages/guides/sass.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: 'Sass'
 tags: communityGuide
 published: true

examples/snowpack/astro/pages/guides/server-side-render.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: Server-Side Rendering (SSR)
 description: This guide will walk you through three different options for setting up Snowpack with your own custom server.
 published: true

examples/snowpack/astro/pages/guides/streaming-imports.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: Streaming Imports
 published: true
 stream: Fetch your npm dependencies on-demand from a remote ESM CDN.

examples/snowpack/astro/pages/guides/tailwind-css.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: 'Tailwind CSS'
 tags: communityGuide
 published: true

examples/snowpack/astro/pages/guides/testing.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: Testing
 published: true
 description: How to choose and use a JavaScript test runner for your Snowpack site.

examples/snowpack/astro/pages/guides/upgrade-guide.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: Snowpack Upgrade Guide
 published: true
 description: How to upgrade to Snowpack v3 from older versions of Snowpack.

examples/snowpack/astro/pages/guides/vue.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: Vue
 tags: communityGuide
 img: '/img/logos/vue.png'

examples/snowpack/astro/pages/guides/wasm.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: 'WASM'
 tags: communityGuide
 published: true

examples/snowpack/astro/pages/guides/web-test-runner.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: '@web/test-runner'
 tags: communityGuide
 img: '/img/logos/modern-web.svg'

examples/snowpack/astro/pages/guides/web-worker.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: 'Web Workers'
 tags: communityGuide
 published: true

examples/snowpack/astro/pages/guides/workbox.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: Workbox
 tags: communityGuide
 description: The Workbox CLI integrates well with Snowpack.

examples/snowpack/astro/pages/posts/2020-05-26-snowpack-2-0-release.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/post.astro
+layout: ../../layouts/post.astro
 bannerVideo: '/img/extra-space-4.mp4'
 permalink: '/posts/2020-05-26-snowpack-2-0-release/'
 title: Snowpack v2.0

examples/snowpack/astro/pages/posts/2020-07-30-snowpack-2-7-release.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/post.astro
+layout: ../../layouts/post.astro
 title: Snowpack 2.7
 description: 'A new plugin API plus smaller, faster production builds.'
 tagline: v2.7.0 release post

examples/snowpack/astro/pages/posts/2020-12-03-snowpack-3-release-candidate.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/post.astro
+layout: ../../layouts/post.astro
 title: 'Snowpack v3.0 Release Candidate'
 tagline: New features to change the way you build for the web.
 description: 'New features to change the way you build for the web. Snowpack v3.0 will release on January 6th, 2021 (the one-year anniversary of its original launch post). This is our biggest release yet with some serious new features, including a new way to load npm packages on-demand that lets you skip the `npm install` step entirely.'

examples/snowpack/astro/pages/posts/2021-01-13-snowpack-3-0.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/post.astro
+layout: ../../layouts/post.astro
 title: 'Snowpack v3.0'
 description: Snowpack v3.0 is here! Our biggest release yet with some serious new features, including pre-bundled streaming imports, built-in bundling & optimizations, new JavaScript APIs, and more.'
 date: 2021-01-13

examples/snowpack/astro/pages/reference/cli-command-line-interface.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: Command Line API
 description: The Snowpack Command Line tool's API, commands, and flags.
 ---

examples/snowpack/astro/pages/reference/common-error-details.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: Common Error Details
 description: How to troubleshoot common issues and error messagesm, plus our resources for getting help.
 ---

examples/snowpack/astro/pages/reference/configuration.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: snowpack.config.js
 description: The Snowpack configuration API reference.
 ---
@@ -20,7 +20,7 @@ To generate a basic configuration file scaffold in your Snowpack project run `sn
 
 ## root
 
-**Type**: `string`  
+**Type**: `string`
 **Default**: `/`
 
 Specify the root of a project using Snowpack. (Previously: `config.cwd`)
@@ -47,7 +47,7 @@ Can be a relative file path, an npm package, or a file within an npm package. Yo
 
 ## exclude
 
-**Type**: `string[]`  
+**Type**: `string[]`
 **Default**: `['**/node_modules/**/*']`
 
 Exclude any files from the Snowpack pipeline.
@@ -151,28 +151,28 @@ Configure the Snowpack dev server.
 
 ### devOptions.secure
 
-**Type**: `boolean`  
+**Type**: `boolean`
 **Default**: `false`
 
 Toggles whether Snowpack dev server should use HTTPS with HTTP2 enabled.
 
 ### devOptions.hostname
 
-**Type**: `string`  
+**Type**: `string`
 **Default**: `localhost`
 
 The hostname that the dev server is running on. Snowpack uses this information to configure the HMR websocket and properly open your browser on startup (see: [`devOptions.open`](#devoptions.open)).
 
 ### devOptions.port
 
-**Type**: `number`  
+**Type**: `number`
 **Default**: `8080`
 
 The port the dev server runs on.
 
 ### devOptions.fallback
 
-**Type**: `string`  
+**Type**: `string`
 **Default**: `"index.html"`
 
 The HTML file to serve for non-resource routes.
@@ -183,7 +183,7 @@ When using the Single-Page Application (SPA) pattern, this is the HTML "shell" f
 
 ### devOptions.open
 
-**Type**: `string`  
+**Type**: `string`
 **Default**: `"**Default**"`
 
 Configures how the dev server opens in the browser when it starts.
@@ -192,7 +192,7 @@ Any installed browser, e.g., "chrome", "firefox", "brave". Set "none" to disable
 
 ### devOptions.output
 
-**Type**: `"stream" | "dashboard"`  
+**Type**: `"stream" | "dashboard"`
 **Default**: `"dashboard"`
 
 Set the output mode of the `dev` console:
@@ -202,35 +202,35 @@ Set the output mode of the `dev` console:
 
 ### devOptions.hmr
 
-**Type**: `boolean`  
+**Type**: `boolean`
 **Default**: `true`
 
 Toggles HMR on the Snowpack dev server.
 
 ### devOptions.hmrDelay
 
-**Type**: `number` (milliseconds)  
+**Type**: `number` (milliseconds)
 **Default**: `0`
 
 Milliseconds to delay HMR-triggered browser update.
 
 ### devOptions.hmrPort
 
-**Type**: `number`  
+**Type**: `number`
 **Default**: [`devOptions.port`](#devoptions.port)
 
 The port where Snowpack's HMR Websocket runs.
 
 ### devOptions.hmrErrorOverlay
 
-**Type**: `boolean`  
+**Type**: `boolean`
 **Default**: `true`
 
 Toggles a browser overlay that displays JavaScript runtime errors when running HMR.
 
 ### devOptions.out
 
-**Type**: `string`  
+**Type**: `string`
 **Default**: `"build"`
 
 _NOTE:_ Deprecated, see `buildOptions.out`.
@@ -249,7 +249,7 @@ Configure how npm packages are installed and used.
 
 ### packageOptions.external
 
-**Type**: `string[]`  
+**Type**: `string[]`
 **Example**: `"external": ["fs"]`
 
 Mark some imports as external. Snowpack will ignore these imports and leave them as-is in your final build.
@@ -258,7 +258,7 @@ This is an advanced feature: Bare imports are not supported in any major browser
 
 ### packageOptions.source
 
-**Type**: `"local" | "remote"`  
+**Type**: `"local" | "remote"`
 **Default**: `"local"`
 **Example**: `"source": "local"`
 
@@ -278,7 +278,7 @@ Known dependencies to install with Snowpack. Used for installing packages any de
 
 #### packageOptions.polyfillNode
 
-**Type**: `boolean`  
+**Type**: `boolean`
 **Default**: `false`
 
 This will automatically polyfill any Node.js dependencies as much as possible for the browser
@@ -313,7 +313,7 @@ This option is only supported in `source="local"` mode. `source="remote"` does n
 
 #### packageOptions.packageLookupFields
 
-**Type**: `string[]`  
+**Type**: `string[]`
 **Example**: `"packageLookupFields": ["svelte"]`
 
 Set custom lookup fields for dependency `package.json` file entrypoints, in addition to the defaults like "module", "main", etc.
@@ -322,7 +322,7 @@ This option is only supported in `source="local"` mode. `source="remote"` does n
 
 #### packageOptions.packageExportLookupFields
 
-**Type**: `string[]`  
+**Type**: `string[]`
 **Example**: `"packageExportLookupFields": ["svelte"]`
 
 Set custom lookup fields for dependency `package.json` ["exports" mappings.](https://nodejs.org/api/packages.html#packages_package_entry_points)
@@ -351,7 +351,7 @@ Enable streaming package imports. Load dependencies from our remote CDN. Manage
 
 #### packageOptions.origin
 
-**Type**: `string`  
+**Type**: `string`
 **Default**: `https://pkg.snowpack.dev`
 
 The remote origin to import packages from. When you import a new package, Snowpack will fetch those resources from this URL.
@@ -360,14 +360,14 @@ Currently, the origin must implement a specific response format that Snowpack ca
 
 #### packageOptions.cache
 
-**Type**: `string`  
+**Type**: `string`
 **Default**: `.snowpack`
 
 The location of your project cache folder, relative to the project root. Snowpack will save cached data to this folder. For example, if `packageOptions.types` is set to true, Snowpack will save TypeScript types to a `types` directory within this folder.
 
 #### packageOptions.types
 
-**Type**: `boolean`  
+**Type**: `boolean`
 **Default**: `false`
 
 If true, Snowpack will download TypeScript types for every package.
@@ -387,7 +387,7 @@ The local directory that we output your final build to.
 
 ### buildOptions.baseUrl
 
-**Type**: `string`  
+**Type**: `string`
 **Default**: `/`
 
 In your HTML, replace all instances of `%PUBLIC_URL%` with this
@@ -396,7 +396,7 @@ Inspired by the same [Create React App](https://create-react-app.dev/docs/using-
 
 ### buildOptions.clean
 
-**Type**: `boolean`  
+**Type**: `boolean`
 **Default**: `true`
 
 Set to `false` to prevent Snowpack from deleting the build output folder (`buildOptions.out`) between builds.
@@ -411,7 +411,7 @@ _NOTE:_ Deprecated, see `buildOptions.metaUrlPath`.
 
 ### buildOptions.metaUrlPath
 
-**Type**: `string`  
+**Type**: `string`
 **Default**: `_snowpack`
 
 Rename the default directory for Snowpack metadata. In every build, Snowpack creates meta files for loading things like [HMR](/concepts/hot-module-replacement), [Environment Variables](/reference/environment-variables), and your built npm packages.
@@ -420,7 +420,7 @@ When you build your project, this will be a path on disk relative to the `buildO
 
 ### buildOptions.sourcemap
 
-**Type**: `boolean`  
+**Type**: `boolean`
 **Default**: `false`
 
 Generates source maps.
@@ -429,14 +429,14 @@ Generates source maps.
 
 ### buildOptions.watch
 
-**Type**: `boolean`  
+**Type**: `boolean`
 **Default**: `false`
 
 Run Snowpack's build pipeline through a file watcher. This option works best for local development when you have a custom frontend server (ex: Rails, PHP, etc.) and the Snowpack dev server cannot be used.
 
 ### buildOptions.htmlFragments
 
-**Type**: `boolean`  
+**Type**: `boolean`
 **Default**: `false`
 
 Toggles whether HTML fragments are transformed like full HTML pages.
@@ -445,14 +445,14 @@ HTML fragments are HTML files not starting with "<!doctype html>".
 
 ### buildOptions.jsxFactory
 
-**Type**: `string`  
+**Type**: `string`
 **Default**: `React.createElement` (or `h` if Preact import is detected)
 
 Set the name of the function used to create JSX elements.
 
 ### buildOptions.jsxFragment
 
-**Type**: `string`  
+**Type**: `string`
 **Default**: `React.Fragment` (or `Fragment` if Preact import is detected)
 
 Set the name of the function used to create JSX fragments.
@@ -463,7 +463,7 @@ Configure your tests.
 
 ### testOptions.files
 
-**Type**: `string[]`  
+**Type**: `string[]`
 **Default**: `["__tests__/**/*", "**/*.@(spec|test).*"]`
 
 Specifies your test files. If `NODE_ENV` is set to "test", Snowpack includes these files in your site build and scan them for installable dependencies. Otherwise, Snowpack excludes these files.

examples/snowpack/astro/pages/reference/environment-variables.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: Environment Variables
 description: Using environment variables with Snowpack
 ---

examples/snowpack/astro/pages/reference/hot-module-replacement.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: Hot Module Replacement (HMR) API
 description: Snowpack implements HMR via the esm-hmr spec, an attempted standard for ESM-based Hot Module Replacement (HMR).
 ---

examples/snowpack/astro/pages/reference/javascript-interface.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: JavaScript API
 description: Snowpack's JavaScript API is for anyone who wants to integrate with some custom build pipeline or server-side rendering engine.
 ---

examples/snowpack/astro/pages/reference/plugins.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: Plugin API
 description: The Snowpack Plugin API and how to use it.
 ---

examples/snowpack/astro/pages/reference/supported-files.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: Supported Files
 description: Snowpack ships with built-in support for many file types including json, js, ts, jsx, css, css modules, and images.
 ---

examples/snowpack/astro/pages/tutorials/getting-started.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: 'Starting a New Project'
 description: This guide shows you how to set up Snowpack from scratch in a Node.js project. Along the way learn key concepts of Snowpack and unbundled development.
 ---

examples/snowpack/astro/pages/tutorials/quick-start.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../../layouts/content.astro
 title: Quick Start
 description: A very basic guide for developers who want to run Snowpack as quickly as possible.
 ---

examples/snowpack/astro/pages/tutorials/react.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content-with-cover.astro
+layout: ../../layouts/content-with-cover.astro
 title: 'Getting Started with React'
 description: 'Get started with this in-depth tutorial on how to build React applications and websites with Snowpack and developer tools like React Fast Refresh'
 date: 2020-12-01

examples/snowpack/astro/pages/tutorials/svelte.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content-with-cover.astro
+layout: ../../layouts/content-with-cover.astro
 title: 'Getting Started with Svelte'
 description: 'Get started with this in-depth tutorial on how to build Svelte applications and websites with Snowpack'
 date: 2020-12-01

snowpack-plugin.cjs

@@ -9,7 +9,7 @@ module.exports = function (snowpackConfig, { resolve, extensions, astroConfig }
     knownEntrypoints: ['deepmerge'],
     resolve: {
       input: ['.astro', '.md'],
-      output: ['.js'],
+      output: ['.js', '.css'],
     },
     async load({ filePath }) {
       const { compileComponent } = await transformPromise;
@@ -21,7 +21,11 @@ module.exports = function (snowpackConfig, { resolve, extensions, astroConfig }
         extensions,
       };
       const result = await compileComponent(contents, { compileOptions, filename: filePath, projectRoot });
-      return result.contents;
+      const output = {
+        '.js': result.contents,
+      };
+      if (result.css) output['.css'] = result.css;
+      return output;
     },
   };
 };

src/@types/astro.ts

@@ -25,9 +25,11 @@ export interface TransformResult {
   script: string;
   imports: string[];
   items: JsxItem[];
+  css?: string;
 }
 
 export interface CompileResult {
   result: TransformResult;
   contents: string;
+  css?: string;
 }

src/compiler/codegen.ts

@@ -21,7 +21,7 @@ interface Attribute {
   end: number;
   type: 'Attribute';
   name: string;
-  value: any;
+  value: TemplateNode[] | boolean;
 }
 
 interface CodeGenOptions {
@@ -41,7 +41,8 @@ function getAttributes(attrs: Attribute[]): Record<string, string> {
       result[attr.name] = JSON.stringify(attr.value);
       continue;
     }
-    if (attr.value === false) {
+    if (attr.value === false || attr.value === undefined) {
+      // note: attr.value shouldn’t be `undefined`, but a bad transform would cause a compile error here, so prevent that
       continue;
     }
     if (attr.value.length > 1) {
@@ -59,7 +60,7 @@ function getAttributes(attrs: Attribute[]): Record<string, string> {
         ')';
       continue;
     }
-    const val: TemplateNode = attr.value[0];
+    const val = attr.value[0];
     if (!val) {
       result[attr.name] = '(' + val + ')';
       continue;
@@ -72,7 +73,7 @@ function getAttributes(attrs: Attribute[]): Record<string, string> {
         result[attr.name] = JSON.stringify(getTextFromAttribute(val));
         continue;
       default:
-        throw new Error('UNKNOWN V');
+        throw new Error(`UNKNOWN: ${val.type}`);
     }
   }
   return result;
@@ -253,7 +254,7 @@ async function acquireDynamicComponentImports(plugins: Set<ValidExtensionPlugins
   return importMap;
 }
 
-export async function codegen(ast: Ast, { compileOptions, filename }: CodeGenOptions): Promise<TransformResult> {
+export async function codegen(ast: Ast, { compileOptions, filename, fileID }: CodeGenOptions): Promise<TransformResult> {
   const { extensions = defaultExtensions, astroConfig } = compileOptions;
   await eslexer.init;
 
@@ -334,6 +335,21 @@ export async function codegen(ast: Ast, { compileOptions, filename }: CodeGenOpt
   let collectionItem: JsxItem | undefined;
   let currentItemName: string | undefined;
   let currentDepth = 0;
+  let css: string[] = [];
+
+  walk(ast.css, {
+    enter(node: TemplateNode) {
+      if (node.type === 'Style') {
+        css.push(node.content.styles); // if multiple <style> tags, combine together
+        this.skip();
+      }
+    },
+    leave(node: TemplateNode) {
+      if (node.type === 'Style') {
+        this.remove(); // this will be optimized in a global CSS file; remove so it‘s not accidentally inlined
+      }
+    },
+  });
 
   walk(ast.html, {
     enter(node: TemplateNode) {
@@ -419,9 +435,9 @@ export async function codegen(ast: Ast, { compileOptions, filename }: CodeGenOpt
           return;
         }
         case 'Style': {
-          const attributes = getAttributes(node.attributes);
+          css.push(node.content.styles); // if multiple <style> tags, combine together
-          items.push({ name: 'style', jsx: `h("style", ${attributes ? generateAttributes(attributes) : 'null'}, ${JSON.stringify(node.content.styles)})` });
+          this.skip();
-          break;
+          return;
         }
         case 'Text': {
           const text = getTextFromAttribute(node);
@@ -469,6 +485,7 @@ export async function codegen(ast: Ast, { compileOptions, filename }: CodeGenOpt
           }
           return;
         case 'Style': {
+          this.remove(); // this will be optimized in a global CSS file; remove so it‘s not accidentally inlined
           return;
         }
         default:
@@ -481,5 +498,6 @@ export async function codegen(ast: Ast, { compileOptions, filename }: CodeGenOpt
     script: script,
     imports: Array.from(importExportStatements),
     items,
+    css: css.length ? css.join('\n\n') : undefined,
   };
 }

src/compiler/index.ts

@@ -10,7 +10,6 @@ import { CompileResult, TransformResult } from '../@types/astro';
 import { parse } from '../parser/index.js';
 import { createMarkdownHeadersCollector } from '../micromark-collect-headers.js';
 import { encodeMarkdown } from '../micromark-encode.js';
-import { defaultLogOptions } from '../logger.js';
 import { optimize } from './optimize/index.js';
 import { codegen } from './codegen.js';
 
@@ -75,14 +74,14 @@ async function convertMdToJsx(
 
   const raw = `---
   ${imports}
-  ${frontmatterData.layout ? `export const __layout = ${JSON.stringify(frontmatterData.layout)};` : ''}
+  ${frontmatterData.layout ? `import {__renderPage as __layout} from '${frontmatterData.layout}';` : 'const __layout = undefined;'}
   export const __content = ${stringifiedSetupContext};
 ---
 <section>${mdHtml}</section>`;
 
   const convertOptions = { compileOptions, filename, fileID };
 
-  return convertAstroToJsx(raw, convertOptions);
+  return await convertAstroToJsx(raw, convertOptions);
 }
 
 type SupportedExtensions = '.astro' | '.md';
@@ -94,9 +93,9 @@ async function transformFromSource(
   const fileID = path.relative(projectRoot, filename);
   switch (path.extname(filename) as SupportedExtensions) {
     case '.astro':
-      return convertAstroToJsx(contents, { compileOptions, filename, fileID });
+      return await convertAstroToJsx(contents, { compileOptions, filename, fileID });
     case '.md':
-      return convertMdToJsx(contents, { compileOptions, filename, fileID });
+      return await convertMdToJsx(contents, { compileOptions, filename, fileID });
     default:
       throw new Error('Not Supported!');
   }
@@ -108,8 +107,6 @@ export async function compileComponent(
 ): Promise<CompileResult> {
   const sourceJsx = await transformFromSource(source, { compileOptions, filename, projectRoot });
   const isPage = path.extname(filename) === '.md' || sourceJsx.items.some((item) => item.name === 'html');
-  // sort <style> tags first
-  sourceJsx.items.sort((a, b) => (a.name === 'style' && b.name !== 'style' ? -1 : 0));
 
   // return template
   let modJsx = `
@@ -144,8 +141,7 @@ export async function __renderPage({request, children, props}) {
 
   // find layout, if one was given.
   if (currentChild.layout) {
-    const layoutComponent = (await import('/_astro/layouts/' + currentChild.layout.replace(/.*layouts\\//, "").replace(/\.astro$/, '.js')));
+    return currentChild.layout({
-    return layoutComponent.__renderPage({
       request,
       props: {content: currentChild.content},
       children: [childBodyResult],
@@ -162,5 +158,6 @@ export async function __renderPage() { throw new Error("No <html> page element f
   return {
     result: sourceJsx,
     contents: modJsx,
+    css: sourceJsx.css,
   };
 }

src/compiler/optimize/styles.ts

@@ -26,7 +26,7 @@ const getStyleType: Map<string, StyleType> = new Map([
 ]);
 
 const SASS_OPTIONS: Partial<sass.Options> = {
-  outputStyle: 'compressed',
+  outputStyle: process.env.NODE_ENV === 'production' ? 'compressed' : undefined,
 };
 /** HTML tags that should never get scoped classes */
 const NEVER_SCOPED_TAGS = new Set<string>(['html', 'head', 'body', 'script', 'style', 'link', 'meta']);
@@ -95,11 +95,10 @@ async function transformStyle(code: string, { type, filename, scopedClass }: { t
   return { css, type: styleType };
 }
 
+/** Style optimizer */
 export default function ({ filename, fileID }: { filename: string; fileID: string }): Optimizer {
   const styleNodes: TemplateNode[] = []; // <style> tags to be updated
   const styleTransformPromises: Promise<StyleTransformResult>[] = []; // async style transform results to be finished in finalize();
-  let rootNode: TemplateNode; // root node which needs <style> tags
-
   const scopedClass = `astro-${hashFromFilename(fileID)}`; // this *should* generate same hash from fileID every time
 
   return {
@@ -124,15 +123,7 @@ export default function ({ filename, fileID }: { filename: string; fileID: strin
               return;
             }
 
-            // 2. find the root node to inject the <style> tag in later
+            // 2. add scoped HTML classes
-            // TODO: remove this when we are injecting <link> tags into <head>
-            if (node.name === 'head') {
-              rootNode = node; // If this is <head>, this is what we want. Always take this if found. However, this may not always exist (it won’t for Component subtrees).
-            } else if (!rootNode) {
-              rootNode = node; // If no <head> (yet), then take the first element we come to and assume it‘s the “root” (but if we find a <head> later, then override this per the above)
-            }
-
-            // 3. add scoped HTML classes
             if (NEVER_SCOPED_TAGS.has(node.name)) return; // only continue if this is NOT a <script> tag, etc.
             // Note: currently we _do_ scope web components/custom elements. This seems correct?
 
@@ -175,10 +166,6 @@ export default function ({ filename, fileID }: { filename: string; fileID: strin
                 scopedClass,
               })
             );
-
-            // TODO: we should delete the old untransformed <style> node after we’re done.
-            // However, the svelte parser left it in ast.css, not ast.html. At the final step, this just gets ignored, so it will be deleted, in a sense.
-            // If we ever end up scanning ast.css for something else, then we’ll need to actually delete the node (or transform it to the processed version)
           },
         },
       },
@@ -186,14 +173,9 @@ export default function ({ filename, fileID }: { filename: string; fileID: strin
     async finalize() {
       const styleTransforms = await Promise.all(styleTransformPromises);
 
-      if (!rootNode) {
-        throw new Error(`No root node found`); // TODO: remove this eventually; we should always find it, but for now alert if there’s a bug in our code
-      }
-
-      // 1. transform <style> tags
       styleTransforms.forEach((result, n) => {
         if (styleNodes[n].attributes) {
-          // 1b. Inject final CSS
+          // 1. Replace with final CSS
           const isHeadStyle = !styleNodes[n].content;
           if (isHeadStyle) {
             // Note: <style> tags in <head> have different attributes/rules, because of the parser. Unknown why
@@ -202,22 +184,22 @@ export default function ({ filename, fileID }: { filename: string; fileID: strin
             styleNodes[n].content.styles = result.css;
           }
 
-          // 3b. Update <style> attributes
+          // 2. Update <style> attributes
           const styleTypeIndex = styleNodes[n].attributes.findIndex(({ name }: any) => name === 'type');
+          // add type="text/css"
           if (styleTypeIndex !== -1) {
             styleNodes[n].attributes[styleTypeIndex].value[0].raw = 'text/css';
             styleNodes[n].attributes[styleTypeIndex].value[0].data = 'text/css';
           } else {
             styleNodes[n].attributes.push({ name: 'type', type: 'Attribute', value: [{ type: 'Text', raw: 'text/css', data: 'text/css' }] });
           }
+          // remove lang="*"
           const styleLangIndex = styleNodes[n].attributes.findIndex(({ name }: any) => name === 'lang');
           if (styleLangIndex !== -1) styleNodes[n].attributes.splice(styleLangIndex, 1);
+          // TODO: add data-astro for later
+          // styleNodes[n].attributes.push({ name: 'data-astro', type: 'Attribute', value: true });
         }
       });
-
-      // 2. inject finished <style> tags into root node
-      // TODO: pull out into <link> tags for deduping
-      rootNode.children = [...styleNodes, ...(rootNode.children || [])];
     },
   };
 }

src/parser/interfaces.ts

@@ -53,7 +53,7 @@ export interface Parser {
   html: Node;
   css: Node;
   js: Node;
-  meta_tags: {};
+  meta_tags: Map<string, string>;
 }
 
 export interface Script extends BaseNode {

src/runtime.ts

@@ -1,8 +1,8 @@
-import type { SnowpackDevServer, ServerRuntime as SnowpackServerRuntime, LoadResult as SnowpackLoadResult, SnowpackConfig } from 'snowpack';
+import type { SnowpackDevServer, ServerRuntime as SnowpackServerRuntime, SnowpackConfig } from 'snowpack';
 import type { AstroConfig } from './@types/astro';
 import type { LogOptions } from './logger';
 import type { CompileError } from './parser/utils/error.js';
-import { info } from './logger.js';
+import { debug, info } from './logger.js';
 
 import { existsSync } from 'fs';
 import { loadConfiguration, logger as snowpackLogger, startServer as startSnowpackServer } from 'snowpack';
@@ -39,7 +39,6 @@ async function load(config: RuntimeConfig, rawPathname: string | undefined): Pro
 
   const selectedPageLoc = new URL(`./pages/${selectedPage}.astro`, astroRoot);
   const selectedPageMdLoc = new URL(`./pages/${selectedPage}.md`, astroRoot);
-  const selectedPageUrl = `/_astro/pages/${selectedPage}.js`;
 
   // Non-Astro pages (file resources)
   if (!existsSync(selectedPageLoc) && !existsSync(selectedPageMdLoc)) {
@@ -62,49 +61,61 @@ async function load(config: RuntimeConfig, rawPathname: string | undefined): Pro
     }
   }
 
-  try {
+  for (const url of [`/_astro/pages/${selectedPage}.astro.js`, `/_astro/pages/${selectedPage}.md.js`]) {
-    const mod = await snowpackRuntime.importModule(selectedPageUrl);
+    try {
-    let html = (await mod.exports.__renderPage({
+      const mod = await snowpackRuntime.importModule(url);
-      request: {
+      debug(logging, 'resolve', `${reqPath} -> ${url}`);
-        host: fullurl.hostname,
+      let html = (await mod.exports.__renderPage({
-        path: fullurl.pathname,
+        request: {
-        href: fullurl.toString(),
+          host: fullurl.hostname,
-      },
+          path: fullurl.pathname,
-      children: [],
+          href: fullurl.toString(),
-      props: {},
+        },
-    })) as string;
+        children: [],
+        props: {},
+      })) as string;
 
-    // inject styles
+      // inject styles
-    // TODO: handle this in compiler
+      // TODO: handle this in compiler
-    const styleTags = Array.isArray(mod.css) && mod.css.length ? mod.css.reduce((markup, url) => `${markup}\n<link rel="stylesheet" type="text/css" href="${url}" />`, '') : ``;
+      const styleTags = Array.isArray(mod.css) && mod.css.length ? mod.css.reduce((markup, href) => `${markup}\n<link rel="stylesheet" type="text/css" href="${href}" />`, '') : ``;
-    if (html.indexOf('</head>') !== -1) {
+      if (html.indexOf('</head>') !== -1) {
-      html = html.replace('</head>', `${styleTags}</head>`);
+        html = html.replace('</head>', `${styleTags}</head>`);
-    } else {
+      } else {
-      html = styleTags + html;
+        html = styleTags + html;
-    }
+      }
 
-    return {
+      return {
-      statusCode: 200,
+        statusCode: 200,
-      contents: html,
+        contents: html,
-    };
+      };
-  } catch (err) {
+    } catch (err) {
-    switch (err.code) {
+      // if this is a 404, try the next URL (will be caught at the end)
-      case 'parse-error': {
+      const notFoundError = err.toString().startsWith('Error: Not Found');
+      if (notFoundError) {
+        continue;
+      }
+
+      if (err.code === 'parse-error') {
         return {
           statusCode: 500,
           type: 'parse-error',
           error: err,
         };
       }
-      default: {
+      return {
-        return {
+        statusCode: 500,
-          statusCode: 500,
+        type: 'unknown',
-          type: 'unknown',
+        error: err,
-          error: err,
+      };
-        };
-      }
     }
   }
+
+  // couldn‘t find match; 404
+  return {
+    statusCode: 404,
+    type: 'unknown',
+    error: new Error(`Could not locate ${selectedPage}`),
+  };
 }
 
 export interface AstroRuntime {

test/astro-styles-ssr.test.js

@@ -8,6 +8,16 @@ const StylesSSR = suite('Styles SSR');
 
 let runtime;
 
+/** Basic CSS minification; removes some flakiness in testing CSS */
+function cssMinify(css) {
+  return css
+    .trim() // remove whitespace
+    .replace(/\n\s*/g, '') // collapse lines
+    .replace(/\s*\{/g, '{') // collapse selectors
+    .replace(/:\s*/g, ':') // collapse attributes
+    .replace(/;}/g, '}'); // collapse block
+}
+
 StylesSSR.before(async () => {
   const astroConfig = await loadConfig(new URL('./fixtures/astro-styles-ssr', import.meta.url).pathname);
 
@@ -54,12 +64,15 @@ StylesSSR('CSS Module support in .astro', async () => {
   let scopedClass;
 
   // test 1: <style> tag in <head> is transformed
-  const css = $('style')
+  const css = cssMinify(
-    .html()
+    $('style')
-    .replace(/\.astro-[A-Za-z0-9-]+/, (match) => {
+      .html()
-      scopedClass = match;
+      .replace(/\.astro-[A-Za-z0-9-]+/, (match) => {
-      return match;
+        scopedClass = match; // get class hash from result
-    }); // remove class hash (should be deterministic / the same every time, but even still don‘t cause this test to flake)
+        return match;
+      })
+  );
+
   assert.equal(css, `.wrapper${scopedClass}{margin-left:auto;margin-right:auto;max-width:1200px}`);
 
   // test 2: element received .astro-XXXXXX class (this selector will succeed if transformed correctly)

test/fixtures/astro-markdown/astro/pages/post.md

@@ -1,5 +1,5 @@
 ---
-layout: layouts/content.astro
+layout: ../layouts/content.astro
 title: My Blog Post
 description: This is a post about some stuff.
 import:
@@ -10,4 +10,4 @@ import:
 
 <div id="first">Some content</div>
 
-<Example />
+<Example />