Feature: having postcss syntax configurable

.flowconfig

@@ -2,3 +2,6 @@
 <PROJECT_ROOT>/node_modules/config-chain/test/broken.json
 <PROJECT_ROOT>/node_modules/conventional-changelog-core/test/fixtures/_malformation.json
 <PROJECT_ROOT>/node_modules/npmconf/test/fixtures/package.json
+
+[options]
+module.ignore_non_literal_requires=true

README.md

@@ -20,6 +20,7 @@ In contrast to [`react-css-modules`](https://github.com/gajus/react-css-modules)
   * [Anonymous reference](#anonymous-reference)
   * [Named reference](#named-reference)
 * [Configuration](#configuration)
+  * [Configurate syntax loaders](#configurate-syntax-loaders)
 * [Installation](#installation)
 * [Example transpilations](#example-transpilations)
   * [Anonymous `styleName` resolution](#anonymous-stylename-resolution)
@@ -167,14 +168,33 @@ NODE_ENV=production ./test
 
 |Name|Description|Default|
 |---|---|---|
-|`generateScopedName`|Refer to [Generating scoped names](https://github.com/css-modules/postcss-modules#generating-scoped-names)|`[path]___[name]__[local]___[hash:base64:5]`|
 |`context`|Must match webpack [`context`](https://webpack.github.io/docs/configuration.html#context) configuration. [`css-loader`](https://github.com/webpack/css-loader) inherits `context` values from webpack. Other CSS module implementations might use different context resolution logic.|`process.cwd()`|
+|`filetypes`|Configure [postcss syntax loaders](https://github.com/postcss/postcss#syntaxes) like sugerss, LESS and SCSS. ||
+|`generateScopedName`|Refer to [Generating scoped names](https://github.com/css-modules/postcss-modules#generating-scoped-names)|`[path]___[name]__[local]___[hash:base64:5]`|
 
 Missing a configuration? [Raise an issue](https://github.com/gajus/babel-plugin-react-css-modules/issues/new?title=New%20configuration:).
 
 > Note:
 > The default configuration should work out of the box with the [css-loader](https://github.com/webpack/css-loader).
 
+### Configurate syntax loaders
+
+To add support for different CSS syntaxes (e.g. SCSS), perform the following two steps:
+
+1. Add the [postcss syntax loader](https://github.com/postcss/postcss#syntaxes) as a development dependency:
+
+  ```bash
+  npm install postcss-scss --save-dev
+  ```
+
+2. Add a filetype syntax mapping to the Babel plugin configuration
+
+  ```json
+  "filetypes": {
+    ".scss": "postcss-scss"
+  }
+  ```
+
 ## Installation
 
 When `babel-plugin-react-css-modules` cannot resolve CSS module at a compile time, it imports a helper function (read [Runtime `styleName` resolution](#runtime-stylename-resolution)). Therefore, you must install `babel-plugin-react-css-modules` as a direct dependency of the project.

package.json

@@ -14,8 +14,7 @@
     "postcss-modules-local-by-default": "^1.1.1",
     "postcss-modules-parser": "^1.1.0",
     "postcss-modules-scope": "^1.0.2",
-    "postcss-modules-values": "^1.2.2",
-    "postcss-scss": "^0.4.0"
+    "postcss-modules-values": "^1.2.2"
   },
   "description": "Transforms styleName to className using compile time CSS module resolution.",
   "devDependencies": {
@@ -31,7 +30,9 @@
     "flow-bin": "^0.37.4",
     "husky": "^0.12.0",
     "mocha": "^3.2.0",
-    "semantic-release": "^6.3.5"
+    "semantic-release": "^6.3.5",
+    "postcss-less": "^0.15.0",
+    "postcss-scss": "^0.4.0"
   },
   "engines": {
     "node": ">5.0.0"

src/index.js

@@ -61,7 +61,11 @@ export default ({
     inherits: babelPluginJsxSyntax,
     visitor: {
       ImportDeclaration (path: Object, stats: Object): void {
-        if (!path.node.source.value.endsWith('.css') && !path.node.source.value.endsWith('.scss')) {
+        stats.opts.filetypes = stats.opts.filetypes || {};
+
+        const extension = path.node.source.value.lastIndexOf('.') > -1 ? path.node.source.value.substr(path.node.source.value.lastIndexOf('.')) : null;
+
+        if (extension !== '.css' && Object.keys(stats.opts.filetypes).indexOf(extension) < 0) {
           return;
         }
 
@@ -84,6 +88,7 @@ export default ({
         }
 
         filenameMap[filename].styleModuleImportMap[styleImportName] = requireCssModule(targetResourcePath, {
+          filetypes: stats.opts.filetypes || {},
           generateScopedName: stats.opts.generateScopedName
         });
       },

src/requireCssModule.js

@@ -14,20 +14,21 @@ import LocalByDefault from 'postcss-modules-local-by-default';
 import Parser from 'postcss-modules-parser';
 import Scope from 'postcss-modules-scope';
 import Values from 'postcss-modules-values';
-import ScssSyntax from 'postcss-scss';
 import type {
   StyleModuleMapType
 } from './types';
 
-const getTokens = (runner, cssSourceFilePath: string): StyleModuleMapType => {
-  const sourceFilePathIsScss = cssSourceFilePath.endsWith('.scss');
+const getTokens = (runner, cssSourceFilePath: string, filetypes): StyleModuleMapType => {
+  const extension = cssSourceFilePath.substr(cssSourceFilePath.lastIndexOf('.'));
+  const syntax = filetypes[extension];
 
   const options: Object = {
     from: cssSourceFilePath
   };
 
-  if (sourceFilePathIsScss) {
-    options.syntax = ScssSyntax;
+  if (syntax) {
+    // eslint-disable-next-line import/no-dynamic-require, global-require
+    options.syntax = require(syntax);
   }
 
   const lazyResult = runner
@@ -44,6 +45,7 @@ const getTokens = (runner, cssSourceFilePath: string): StyleModuleMapType => {
 };
 
 type OptionsType = {|
+  filetypes: Object,
   generateScopedName?: string,
   context?: string
 |};
@@ -60,7 +62,7 @@ export default (cssSourceFilePath: string, options: OptionsType): StyleModuleMap
     const fromDirectoryPath = dirname(from);
     const toPath = resolve(fromDirectoryPath, to);
 
-    return getTokens(runner, toPath);
+    return getTokens(runner, toPath, options.filetypes);
   };
 
   const plugins = [
@@ -77,5 +79,5 @@ export default (cssSourceFilePath: string, options: OptionsType): StyleModuleMap
 
   runner = postcss(plugins);
 
-  return getTokens(runner, cssSourceFilePath);
+  return getTokens(runner, cssSourceFilePath, options.filetypes);
 };

test/fixtures/react-css-modules/resolves less stylesheets/actual.js

@@ -0,0 +1,3 @@
+import './bar.less';
+
+<div styleName="a"></div>;

test/fixtures/react-css-modules/resolves less stylesheets/bar.less

@@ -0,0 +1,3 @@
+@color: #f00;
+
+.a {background-color: @color;}

test/fixtures/react-css-modules/resolves less stylesheets/expected.js

@@ -0,0 +1,3 @@
+import './bar.less';
+
+<div className="bar__a"></div>;

test/fixtures/react-css-modules/resolves less stylesheets/options.json

@@ -0,0 +1,13 @@
+{
+  "plugins": [
+    [
+      "../../../../src",
+      {
+        "generateScopedName": "[name]__[local]",
+        "filetypes": {
+          ".less": "postcss-less"
+        }
+      }
+    ]
+  ]
+}