webpack.make.js

'user strict';

var webpack = require('webpack');
var autoprefixer = require('autoprefixer');
var HtmlWebpackPlugin = require('html-webpack-plugin');
var ExtractTextPlugin = require('extract-text-webpack-plugin');

module.exports = function(options) {
    /**
     * Environment type
     * BUILD is for generating minified builds
     * TEST is for generating test builds
     */
    var BUILD = !!options.BUILD;
    var TEST = !!options.TEST;

    /**
     * Config
     * Reference: http://webpack.github.io/docs/configuration.html
     * This is the object where all configuration gets set
     */
    var config = {};

    /**
     * Entry
     * Reference: http://webpack.github.io/docs/configuration.html#entry
     * Should be an empty object if it's generating a test build
     * Karma will set this when it's a test build
     */
    if (TEST) {
        config.entry = {}
    } else {
        config.entry = {
            app: './src/app.js'
        }
    }

    /**
     * Output
     * Reference: http://webpack.github.io/docs/configuration.html#output
     * Should be an empty object if it's generating a test build
     * Karma will handle setting it up for you when it's a test build
     */
    if (TEST) {
        config.output = {};
    } else {
        config.output = {
            // Absolute output directory
            path: __dirname + '/public',

            // Output path from the view of the page
            // Uses webpack-dev-server in development
            publicPath: BUILD ? '/' : 'http://localhost:8080/',

            // Filename for entry points
            // Only adds hash in build mode
            filename: BUILD ? '[name].[hash].js' : '[name].bundle.js',

            // Filename for non-entry points
            // Only adds hash in build mode
            chunkFilename: BUILD ? '[name].[hash].js' : '[name].bundle.js'
        };
    }

    /**
     * Devtool
     * Reference: http://webpack.github.io/docs/configuration.html#devtool
     * Type of sourcemap to use per build type
     */
    if (TEST) {
        config.devtool = 'inline-source-map';
    } else if (BUILD) {
        config.devtool = 'source-map';
    } else {
        config.devtool = 'eval';
    }

    /**
     * Loaders
     * Reference: http://webpack.github.io/docs/configuration.html#module-loaders
     * List: http://webpack.github.io/docs/list-of-loaders.html
     * This handles most of the magic responsible for converting modules
     */

    // Initialize module
    config.module = {
        preLoaders: [],
        loaders: [{
            // JS LOADER
            // Reference: https://github.com/babel/babel-loader
            // Transpile .js files using babel-loader
            // Compiles ES6 and ES7 into ES5 code
            test: /\.js$/,
            loader: 'babel',
            exclude: /node_modules/
        }, {
            // ASSET LOADER
            // Reference: https://github.com/webpack/file-loader
            // Copy png, jpg, jpeg, gif, svg, woff, woff2, ttf, eot files to output
            // Rename the file using the asset hash
            // Pass along the updated reference to your code
            // You can add here any file extension you want to get copied to your output
            test: /\.(png|jpg|jpeg|gif|svg|woff|woff2|ttf|eot)$/,
            loader: 'file'
        }, {
            // HTML LOADER
            // Reference: https://github.com/webpack/raw-loader
            // Allow loading html through js
            test: /\.html$/,
            loader: 'raw'
        }]
    };

    // ISPARTA LOADER
    // Reference: https://github.com/ColCh/isparta-instrumenter-loader
    // Instrument JS files with Isparta for subsequent code coverage reporting
    // Skips node_modules and files that end with .test.js
    if (TEST) {
        config.module.preLoaders.push({
            test: /\.js$/,
            exclude: [
                /node_modules/,
                /\.test\.js$/
            ],
            loader: 'isparta-instrumenter'
        })
    }

    // CSS LOADER
    // Reference: https://github.com/webpack/css-loader
    // Allow loading css through js
    //
    // Reference: https://github.com/postcss/postcss-loader
    // Postprocess your css with PostCSS plugins
    var cssLoader = {
        test: /\.css$/,
        // Reference: https://github.com/webpack/extract-text-webpack-plugin
        // Extract css files in production builds
        //
        // Reference: https://github.com/webpack/style-loader
        // Use style-loader in development for hot-loading
        loader: ExtractTextPlugin.extract('style', 'css?sourceMap!postcss')
    };

    var sassLoader = {
        test: /\.scss$/,
        loader: ExtractTextPlugin.extract('style', 'css?sourceMap!sass?sourceMap')
    };

    // Skip loading css in test mode
    if (TEST) {
        // Reference: https://github.com/webpack/null-loader
        // Return an empty module
        cssLoader.loader = 'null'
        sassLoader.loader = 'null'
    }

    // Add cssLoader to the loader list
    config.module.loaders.push(cssLoader);
    config.module.loaders.push(sassLoader);

    /**
     * PostCSS
     * Reference: https://github.com/postcss/autoprefixer-core
     * Add vendor prefixes to your css
     */
    config.postcss = [
        autoprefixer({
            browsers: ['last 2 version']
        })
    ];

    /**
     * Plugins
     * Reference: http://webpack.github.io/docs/configuration.html#plugins
     * List: http://webpack.github.io/docs/list-of-plugins.html
     */
    config.plugins = [
        // Reference: https://github.com/webpack/extract-text-webpack-plugin
        // Extract css files
        // Disabled when in test mode or not in build mode
        new ExtractTextPlugin('[name].[hash].css', {
            disable: !BUILD || TEST
        })
    ];

    // Skip rendering index.html in test mode
    if (!TEST) {
        // Reference: https://github.com/ampedandwired/html-webpack-plugin
        // Render index.html
        config.plugins.push(
            new HtmlWebpackPlugin({
                template: './src/index.html',
                inject: 'body'
            })
        )
    }

    // Add build specific plugins
    if (BUILD) {
        config.plugins.push(
            // Reference: http://webpack.github.io/docs/list-of-plugins.html#noerrorsplugin
            // Only emit files when there are no errors
            new webpack.NoErrorsPlugin(),

            // Reference: http://webpack.github.io/docs/list-of-plugins.html#dedupeplugin
            // Dedupe modules in the output
            new webpack.optimize.DedupePlugin(),

            // Reference: http://webpack.github.io/docs/list-of-plugins.html#uglifyjsplugin
            // Minify all javascript, switch loaders to minimizing mode
            new webpack.optimize.UglifyJsPlugin()
        )
    }

    /**
     * Dev server configuration
     * Reference: http://webpack.github.io/docs/configuration.html#devserver
     * Reference: http://webpack.github.io/docs/webpack-dev-server.html
     */
    config.devServer = {
        contentBase: './public',
        stats: {
            modules: false,
            cached: false,
            colors: true,
            chunk: false
        }
    };

    return config;
};