css minification with cssnano

notes.md

@@ -20,6 +20,10 @@ Requirements
 * live server with hmr
 * clean dist directories
 
+## NOT INCLUDED
+* code splitting
+
+
 #### html
 
 * html-webpack-plugin - automatically create index.html or use a template file
@@ -47,18 +51,17 @@ Requirements
 * postcss-import
 * postcss-mixins
 * postcss-functions
+* cssnano-webpack-plugin
 * stylelint
 * stylelint-webpack-plugin
-* cssnano
 
 #### other
 
-* webpack-dev-server
 * clean-webpack-plugin
 
 
 #### live server
-
+* webpack-dev-server
 
 
 
@@ -71,7 +74,7 @@ with
 `"private": "true"`
 
 
-## Usage Notes
+## Notes
 
 Asset management:
 
@@ -97,3 +100,7 @@ If we don't want the loader to treat it as a local file we can use (in webpack.c
 types - asset/resource (file-loader), asset/inline (url-loader), asset/source (raw-loader), asset (url-loader)
 for `asset` default size is 8kb. - can configure see
 [docs](https://webpack.js.org/guides/asset-modules/). 
+
+## Environment variables
+
+to use environment variables, must change module.exports to use a function.

package.json

@@ -5,14 +5,15 @@
   "private": true,
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
-		"start": "webpack serve",
-    "build": "webpack"
+    "start": "webpack serve",
+    "build": "webpack --env production"
   },
   "author": "",
   "license": "ISC",
   "devDependencies": {
     "clean-webpack-plugin": "^3.0.0",
     "css-loader": "^5.0.1",
+    "cssnano-webpack-plugin": "^1.0.3",
     "html-webpack-plugin": "^4.5.0",
     "mini-css-extract-plugin": "^1.3.3",
     "postcss": "^8.2.2",

webpack.config.js

@@ -1,66 +1,84 @@
 const path = require('path');
 const HtmlWebpackPlugin = require('html-webpack-plugin');
 const MiniCssExtractPlugin = require('mini-css-extract-plugin');
+const CssnanoPlugin = require ('cssnano-webpack-plugin');
 const { CleanWebpackPlugin } = require('clean-webpack-plugin');
 
-module.exports = {
-	mode: 'development',
-	entry: './src/js/index.js',
-	output: {
-		filename: '[name].bundle.js',
-		path: path.resolve(__dirname, 'dist'),
-	},
-	devtool: 'inline-source-map',
-	devServer: {
-		contentBase: './dist',
-		hot: true,
-	},
-	plugins: [
-		new MiniCssExtractPlugin(),
-		new CleanWebpackPlugin(),
-		new HtmlWebpackPlugin({
-			template: 'src/html/index.html'
-		}),
-	],
-	module: {
-		rules: [
-			{
-				test: /\.inline\.css$/i,
-				use: [
-					{
-            loader: 'style-loader',
-            options: {
-              insert: function insertAtTop(element) {
-                var parent = document.querySelector('head');
-                // eslint-disable-next-line no-underscore-dangle
-                var lastInsertedElement =
-                  window._lastElementInsertedByStyleLoader;
+module.exports = env => {
+	console.log(env);
 
-                if (!lastInsertedElement) {
-                  parent.insertBefore(element, parent.firstChild);
-                } else if (lastInsertedElement.nextSibling) {
-                  parent.insertBefore(element, lastInsertedElement.nextSibling);
-                } else {
-                  parent.appendChild(element);
-                }
+	return {
+		mode: env.production ? 'production' : 'development',
+		target: 'web',
+		entry: './src/js/index.js',
+		output: {
+			filename: env.production ? '[name].[contenthash].bundle.js' : '[name].bundle.js',
+			path: path.resolve(__dirname, 'dist'),
+		},
+		devtool: env.production ? 'cheap-source-map' : 'inline-source-map',
+		devServer: {
+			contentBase: './dist',
+			hot: true,
+		},
+		plugins: [
+			new MiniCssExtractPlugin({
+				filename: env.production ? '[name].[contenthash].css' : '[name].css',
+			}),
+			new CleanWebpackPlugin(),
+			new HtmlWebpackPlugin({
+				template: 'src/html/index.html'
+			}),
+		],
+		module: {
+			rules: [
+				{
+					test: /\.inline\.css$/i,
+					include: path.resolve(__dirname, 'src/css'),
+					use: [
+						{
+							loader: 'style-loader',
+							options: {
+								insert: function insertAtTop(element) {
+									var parent = document.querySelector('head');
+									// eslint-disable-next-line no-underscore-dangle
+									var lastInsertedElement =
+										window._lastElementInsertedByStyleLoader;
 
-                // eslint-disable-next-line no-underscore-dangle
-                window._lastElementInsertedByStyleLoader = element;
-              },
-            },
-          },
-					'css-loader',
-					'postcss-loader'],
-			},
-			{
-				test: /\.css$/i,
-				exclude: /\.inline\.css$/i,
-				use: [MiniCssExtractPlugin.loader, 'css-loader', 'postcss-loader'],
-			},
-			{
-				test: /.(png|svg|jpg|jpeg|gif)$/i,
-				type: 'asset',
-			},
-		]
-	},
+									if (!lastInsertedElement) {
+										parent.insertBefore(element, parent.firstChild);
+									} else if (lastInsertedElement.nextSibling) {
+										parent.insertBefore(element, lastInsertedElement.nextSibling);
+									} else {
+										parent.appendChild(element);
+									}
+
+									// eslint-disable-next-line no-underscore-dangle
+									window._lastElementInsertedByStyleLoader = element;
+								},
+							},
+						},
+						'css-loader',
+						'postcss-loader'],
+				},
+				{
+					test: /\.css$/i,
+					include: path.resolve(__dirname, 'src/css'),
+					exclude: /\.inline\.css$/i,
+					use: [MiniCssExtractPlugin.loader, 'css-loader', 'postcss-loader'],
+				},
+				{
+					test: /.(png|svg|jpg|jpeg|gif)$/i,
+					include: path.resolve(__dirname, 'src'),
+					type: 'asset',
+				},
+			]
+		},
+		optimization: {
+			minimizer: [
+				new CssnanoPlugin({
+					sourceMap: true,
+				})
+			],
+		},
+	}
 };