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posts/Web Stuff/2016-10-28-webpack-build-optimization.md

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+# Building for production with Webpack
+
+I've been using webpack for almost 6 months now and I still only know a fraction of the tools it provides. Bundling my files for production has been a bit of an annoyance, but I'm at a point where everything works. View my current webpack configuration file at the bottom of the post.
+
+## Production vs. Development
+
+So the goal is to have two different build options for webpack: one for production and one for development. The development build needs to include things like source maps and logging while the production build needs JS minification. There are a few different ways to do this.
+
+### Multiple webpack configuration files
+
+Some choose to create a `webpack.prod.config.js` file, which could be useful for projects of massive scale. I found this option a bit tedious because I did not want to update two different configuration files when I found a new tool for webpack.
+
+### NODE_ENV=production webpack -p
+
+NODE_ENV is an environment variable that can be used within the code itself. I use one `webpack.config.js` file and enable certain plugins based on this condition. The environment variable can be passed to webpack with `NODE=<variable> webpack`. On Windows the command translates to the command below. For some reason Windows likes to add the space after production to the variable so that must be removed. There is a tool called [cross-env](https://github.com/kentcdodds/cross-env) that solves this issue, but I have not used it as I primarily develop on a unix system.
+
+```bash
+  set NODE_ENV=production&&webpack -p
+```
+
+I'm not going to discuss the specific plugins I use as they change quite often, but a few of the production plugins are below. More information about these can be found in the webpack documentation.
+
+```javascript
+    var debug = process.env.NODE_ENV !== 'production';
+    
+    if (!debug){
+        plugins = plugins.concat([
+            new webpack.optimize.DedupePlugin(),
+            new webpack.optimize.OccurenceOrderPlugin(),
+            new webpack.optimize.UglifyJsPlugin({ mangle: false, sourcemap: false})
+      ])}
+    }
+```
+
+This environment variable can be passed to the application this way by using the webpack environment plugin.
+
+```javascript
+    new webpack.EnvironmentPlugin([
+      "NODE_ENV"
+    ])
+```
+
+`process.env.NODE_ENV` can then be checked for within the application itself. I currently use this to enable Redux logging for development.
+ 
+```javascript
+    const debug = process.env.NODE_ENV !== 'production';
+    
+    //run redux logger if we are in dev mode
+    const middleware = debug ? applyMiddleware(thunk, logger()) : applyMiddleware(thunk);
+```
+
+I was originally going to discuss build optimization here, but I think I will save that for another post. My JS bundle was almost 1mb and I got it down to a little less than 400kb.
+
+## My current webpack configurations
+ 
+Here is my webpack.config.js file at the time of writing this post. My current webpack config file can be found here. [webpack.config.js](https://github.com/mgerb/mywebsite/blob/master/webpack.config.js)
+
+```javascript
+    var debug = process.env.NODE_ENV !== "production";
+    var webpack = require('webpack');
+    var path = require('path');
+    var HtmlWebpackPlugin = require('html-webpack-plugin');
+    var autoprefixer = require('autoprefixer');
+    var Visualizer = require('webpack-visualizer-plugin');
+    
+    module.exports = {
+      devtool: debug ? "inline-sourcemap" : null,
+      entry: ["babel-polyfill", "./client/js/app.js"],
+      module: {
+        loaders: [
+          {
+            test: /\.js?$/,
+            exclude: /(node_modules)/,
+            loader: 'babel-loader',
+            query: {
+              presets: ['react', 'es2015', 'stage-0'],
+              plugins: ['react-html-attrs', 'transform-class-properties', 'transform-decorators-legacy'],
+            }
+          },
+          { test: /\.scss$/, loader: "style-loader!css-loader!postcss-loader!sass-loader"},
+          { test: /\.css$/, loader: "style-loader!css-loader" },
+          { test: /\.png$/, loader: "url-loader?limit=100000&name=images/[hash].[ext]" },
+          { test: /\.jpg$/, loader: "url-loader?limit=100000&name=images/[hash].[ext]" },
+          { test: /\.svg(\?v=\d+\.\d+\.\d+)?$/, loader: "url?limit=10000&mimetype=image/svg+xml&name=images/[hash].[ext]"},
+          { test: /\.woff(\?v=\d+\.\d+\.\d+)?$/, loader: "url?limit=10000&mimetype=application/font-woff&name=fonts/[hash].[ext]"},
+          { test: /\.woff2(\?v=\d+\.\d+\.\d+)?$/, loader: "url?limit=10000&mimetype=application/font-woff&name=fonts/[hash].[ext]"},
+          { test: /\.ttf(\?v=\d+\.\d+\.\d+)?$/, loader: "url?limit=10000&mimetype=application/octet-stream&name=fonts/[hash].[ext]"},
+          { test: /\.eot(\?v=\d+\.\d+\.\d+)?$/, loader: "file?name=fonts/[hash].[ext]"}
+        ]
+      },
+      postcss: function(){ return [autoprefixer]},
+      output: {
+        path: __dirname + "/public/",
+        publicPath: "/public/",
+        filename: "client.min.js"
+      },
+      plugins: getPlugins(),
+      externals:{
+        "hljs": "hljs",
+        "react": "React",
+        "react-dom": "ReactDOM",
+        "react-router": "ReactRouter"
+      }
+    };
+    
+    function getPlugins(){
+      var plugins = [
+          new HtmlWebpackPlugin({
+          fileName: 'index.html',
+          template: 'index.html',
+          inject: 'body',
+          hash: true
+        }),
+        new webpack.EnvironmentPlugin([
+          "NODE_ENV"
+        ]),
+        new Visualizer({
+          filename: "../stats.html"
+        })
+      ];
+      if(!debug){
+        plugins = plugins.concat([
+            new webpack.optimize.DedupePlugin(),
+            new webpack.optimize.OccurenceOrderPlugin(),
+            new webpack.optimize.UglifyJsPlugin({ mangle: false, sourcemap: false})
+      ])}
+      return plugins; 
+    }
+```

posts/minimize-js-bundle.md

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+# Minimizing JS bundle size with Webpack
+
+I haven't been paying much attention to the bundle size of my JS files until recently I discovered it was almost 1mb (after minification)! Even after gzip the bundle was over 300kb. Although this site doesn't get much traffic this was unacceptable in my eyes.
+
+## Why was it so big?
+
+I had no idea why my bundle size was so huge because I wasn't using an large libraries or anything. I needed something like a profiler, or a way to analyze each mondule being loaded because I had no idea where to start.
+
+## Webpack visualizer plugin
+
+I came across this plugin and it is what saved me. I shows an interactive graph of each module being loaded along with sub modules. It was just what I needed! To my surprise, highlight.js was taking up almost 600kb (keep in mind webpack visualizer shows sizes before minification)