Initial implementation.

Author: NMFR

.gitignore

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+node_modules
+jsconfig.json

README.md

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+# Optimize CSS Assets Webpack Plugin
+
+A Webpack plugin to optimize \ minimize CSS assets.

index.js

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+var fs = require('fs');
+var path = require('path');
+var _ = require('underscore');
+var cssnano = require('cssnano');
+
+function OptimizeCssAssetsPlugin() {};
+
+OptimizeCssAssetsPlugin.prototype.apply = function(compiler) {
+  compiler.plugin('after-emit', function (compilation, callback) {
+    console.log('');
+    console.log('Starting to optimize CSS...');
+    var outputPath = compiler.options.output.path;
+    var stats = compilation.getStats().toJson();
+    var assetsByChunkName = stats.assetsByChunkName;
+    var files = _.flatten(_.values(assetsByChunkName));
+    var cssFiles = _.filter(files, function(fn){ return fn && fn.match && fn.match(/\.css$/g); });
+    var counter = 0;
+    function checkFinish() {
+      if (cssFiles.length >= counter++) {
+        console.log('CSS optimize ended.');
+        callback();
+      }
+    };
+    _.each(
+      cssFiles, 
+      function(filename) {
+        console.log('Processing ' + filename);
+        var filePath = path.join(outputPath,  filename);
+        var css = fs.readFileSync(filePath, 'utf8');
+        cssnano.process(css, {discardComments: {removeAll: true}}).then(
+          function (result) {
+            fs.writeFileSync(filePath, result.css);
+            console.log('Processing ' + filename + ' ended');
+            checkFinish();
+          }, function(err) {
+            console.log('Error processing file: ' + filename);
+            console.log(err);
+            checkFinish();
+          }
+        );
+      }
+    );
+  });
+};
+
+module.exports = OptimizeCssAssetsPlugin;

package.json

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+{
+  "name": "optimize-css-assets-webpack-plugin",
+  "version": "1.0.0",
+  "author": "Nuno Rodrigues",
+  "description": "A Webpack plugin to optimize \\ minimize CSS assets.",
+  "dependencies": {
+    "cssnano": "^3.4.0",
+    "underscore": "^1.8.3"
+  },
+  "main": "index.js",
+  "homepage": "http://github.com/NMFR/optimize-css-assets-webpack-plugin",
+  "repository": {
+    "type": "git",
+    "url": "http://github.com/NMFR/optimize-css-assets-webpack-plugin.git"
+  },
+  "license": "MIT"
+}