feature/issue 1233 CSS Modules ™️ plugin

packages/cli/src/config/rollup.config.js

@@ -62,17 +62,19 @@
       };
 
       // filter first for any bare specifiers
-      if (await checkResourceExists(idUrl) && extension !== 'js') {
-        for (const plugin of resourcePlugins) {
-          if (plugin.shouldResolve && await plugin.shouldResolve(idUrl)) {
-            idUrl = new URL((await plugin.resolve(idUrl)).url);
+      if (await checkResourceExists(idUrl) && !id.startsWith('\x00')) {
+        if (extension !== 'js') {
+          for (const plugin of resourcePlugins) {
+            if (plugin.shouldResolve && await plugin.shouldResolve(idUrl)) {
+              idUrl = new URL((await plugin.resolve(idUrl)).url);
+            }
           }
         }
 
         const request = new Request(idUrl, {
           headers
         });
-        let response = new Response('');
+        let response = new Response('', { headers: { 'Content-Type': 'text/javascript' } });
 
         for (const plugin of resourcePlugins) {
           if (plugin.shouldServe && await plugin.shouldServe(idUrl, request)) {
@@ -367,7 +369,7 @@
             }
           }
         } else {
           // TODO figure out how to handle URL chunk from SSR pages
           // https://github.com/ProjectEvergreen/greenwood/issues/1163
         }
 

packages/cli/src/lifecycles/prerender.js

@@ -1,5 +1,5 @@
 import fs from 'fs/promises';
-import { checkResourceExists, trackResourcesForRoute } from '../lib/resource-utils.js';
+import { checkResourceExists, trackResourcesForRoute, mergeResponse } from '../lib/resource-utils.js';
 import os from 'os';
 import { WorkerPool } from '../lib/threadpool.js';
 
@@ -30,12 +30,12 @@ async function interceptPage(url, request, plugins, body) {
   });
 
   for (const plugin of plugins) {
-    if (plugin.shouldPreIntercept && await plugin.shouldPreIntercept(url, request, response)) {
-      response = await plugin.preIntercept(url, request, response);
+    if (plugin.shouldPreIntercept && await plugin.shouldPreIntercept(url, request, response.clone())) {
+      response = mergeResponse(response, await plugin.preIntercept(url, request, response.clone()));
     }
 
-    if (plugin.shouldIntercept && await plugin.shouldIntercept(url, request, response)) {
-      response = await plugin.intercept(url, request, response);
+    if (plugin.shouldIntercept && await plugin.shouldIntercept(url, request, response.clone())) {
+      response = mergeResponse(response, await plugin.intercept(url, request, response.clone()));
     }
   }
 

packages/cli/test/cases/build.default.workspace-layouts-page/build.default.workspace-layouts-page.spec.js

@@ -133,7 +133,6 @@ describe('Build Greenwood With: ', function() {
         });
       });
     });
-
   });
 
   after(function() {

packages/plugin-css-modules/README.md

@@ -0,0 +1,126 @@
+# @greenwood/plugin-css-modules
+
+## Overview
+
+A Greenwood plugin for authoring [**CSS Modules ™️**](https://github.com/css-modules/css-modules).  It is a modest implementation of [the specification](https://github.com/css-modules/icss).  🙂
+
+This is NOT to be confused with [CSS Module _Scripts_](https://web.dev/articles/css-module-scripts), which Greenwood already supports.
+
+> This package assumes you already have `@greenwood/cli` installed.
+
+## Installation
+
+You can use your favorite JavaScript package manager to install this package.
+
+_examples:_
+```bash
+# npm
+npm i -D @greenwood/plugin-css-modules
+
+# yarn
+yarn add @greenwood/plugin-css-modules --dev
+```
+
+## Usage
+
+Add this plugin to your _greenwood.config.js_.
+
+```javascript
+import { greenwoodPluginCssModules } from '@greenwood/plugin-css-modules';
+
+export default {
+  ...
+
+  plugins: [
+    greenwoodPluginCssModules()
+  ]
+}
+```
+
+Now you can create a CSS file that ends in _.module.css_
+
+```css
+/* header.module.css */
+.container {
+  display: flex;
+  justify-content: space-between;
+}
+
+.navBarMenu {
+  border: 1px solid #020202;
+}
+
+.navBarMenuItem {
+  & a {
+    text-decoration: none;
+    color: #020202;
+  }
+}
+
+@media screen and (min-width: 768px) {
+  .container {
+    padding: 10px 20px;
+  }
+}
+```
+
+
+And reference that in your (Light DOM) HTML based Web Component
+
+```js
+// header.js
+import styles from './header.module.css';
+
+export default class Header extends HTMLElement {
+  connectedCallback() {
+    this.innerHTML = `
+      <header class="${styles.container}">
+        <ul class="${styles.navBarMenu}">
+          <li class="${styles.navBarMenuItem}">
+            <a href="/about/" title="Documentation">About</a>
+          </li>
+          <li class="${styles.navBarMenuItem}">
+            <a href="/contact/" title="Guides">Contact</a>
+          </li>
+        </ul>
+      </header>
+    `;
+  }
+}
+
+customElements.define('app-header', Header);
+```
+
+From there, Greenwood will scope your CSS by prefixing with the filename and a hash, and inline that into a `<style>` tag in the HTML and strip the reference to the _module.css_ file from your JavaScript file.
+
+
+## Caveats
+
+> This plugin aims to cover a representative majority of the specification, though if you find missing capabilities please consider submitting an issue and / or PR!
+
+There are some caveats to consider when using this plugin:
+
+1. This plugin only supports usage of CSS Modules within vanilla JavaScript, or [TypeScript (_.ts_)](https://github.com/ProjectEvergreen/greenwood/tree/master/packages/plugin-typescript) and [JSX (_.jsx_)](https://github.com/ProjectEvergreen/greenwood/tree/master/packages/plugin-import-jsx) when combined with our plugins
+1. This plugin only checks for [lower camelCase](https://github.com/css-modules/css-modules/blob/master/docs/naming.md) based class names
+    ```css
+    /* works ✅ */
+    .navBar { }
+
+    /* does not work 🚫 */
+    .nav-bar { }
+    ```
+1. Destructuring is not supported, so this will not work
+    ```js
+    import styles from './header.module.css';
+
+    export default class Header extends HTMLElement {
+      connectedCallback() {
+        const { container, navBar, ... } = styles;
+
+        // ...
+      }
+    }
+
+    customElements.define('app-header', Header);
+    ```
+1. From the spec, [exporting `@value` variables](https://github.com/css-modules/css-modules/blob/master/docs/values-variables.md) is not supported

packages/plugin-css-modules/package.json

@@ -0,0 +1,38 @@
+{
+  "name": "@greenwood/plugin-css-modules",
+  "version": "0.30.0-alpha.6",
+  "description": "A Greenwood plugin for authoring CSS Modules",
+  "repository": "https://github.com/ProjectEvergreen/greenwood",
+  "homepage": "https://github.com/ProjectEvergreen/greenwood/tree/master/packages/plugin-css-modules",
+  "author": "Owen Buckley <[email protected]>",
+  "license": "MIT",
+  "keywords": [
+    "Greenwood",
+    "Static Site Generator",
+    "Full Stack Web Development",
+    "Web Components",
+    "CSS Modules"
+  ],
+  "main": "src/index.js",
+  "type": "module",
+  "files": [
+    "src/"
+  ],
+  "publishConfig": {
+    "access": "public"
+  },
+  "peerDependencies": {
+    "@greenwood/cli": "^0.4.0"
+  },
+  "dependencies": {
+    "acorn": "^8.0.1",
+    "acorn-import-attributes": "^1.9.5",
+    "acorn-walk": "^8.0.0",
+    "css-tree": "^3.0.0",
+    "node-html-parser": "^1.2.21",
+    "sucrase": "^3.35.0"
+  },
+  "devDependencies": {
+    "@greenwood/cli": "^0.30.0-alpha.6"
+  }
+}