webpack.config.dev.js

const { resolve } = require('path');

const webpack = require('webpack');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const ExtractTextPlugin = require('extract-text-webpack-plugin');
const CopyWebpackPlugin = require('copy-webpack-plugin');
const OpenBrowserPlugin = require('open-browser-webpack-plugin');

const config = {
  devtool: 'cheap-module-eval-source-map',

  devServer: {
    contentBase: resolve(__dirname, 'build'),
    publicPath: '/',
    hot: true,
    historyApiFallback: true,
    port: 3000
  },
  
  entry: [
    'react-hot-loader/patch',
    'webpack-dev-server/client?http://localhost:3000',
    'webpack/hot/only-dev-server',
    './main.js',
    './assets/scss/main.scss',
  ],

  output: {
    filename: 'bundle.js',
    path: resolve(__dirname, 'dist'),
    publicPath: '',
  },

  context: resolve(__dirname, 'src'),

  module: {
    rules: [
      {
        test: /\.js$/,
        loaders: [
          'babel-loader',
        ],
        exclude: /node_modules/,
      },
      {
        test: /\.scss$/,
        exclude: /node_modules/,
        use: ExtractTextPlugin.extract({
          fallback: 'style-loader',
          use: [
            'css-loader',
            {
              loader: 'sass-loader',
              query: {
                sourceMap: false,
              },
            },
          ],
          publicPath: '../'
        }),
      },
      { test: /\.(png|jpg|gif)$/, use: 'url-loader?limit=15000&name=images/[name].[ext]' },
      { test: /\.eot(\?v=\d+.\d+.\d+)?$/, use: 'file-loader?&name=fonts/[name].[ext]' },
      { test: /\.woff(2)?(\?v=[0-9]\.[0-9]\.[0-9])?$/, use: 'url-loader?limit=10000&mimetype=application/font-woff&name=fonts/[name].[ext]' },
      { test: /\.[ot]tf(\?v=\d+.\d+.\d+)?$/, use: 'url-loader?limit=10000&mimetype=application/octet-stream&name=fonts/[name].[ext]' },
      { test: /\.svg(\?v=\d+\.\d+\.\d+)?$/, use: 'url-loader?limit=10000&mimetype=image/svg+xml&name=images/[name].[ext]' },
    ]
  },

  plugins: [
    //自動生成html
    new HtmlWebpackPlugin({
      hash: true,
      template: `${__dirname}/src/index.html`,
      filename: 'index.html',
      inject: 'body',
    }),
    new webpack.optimize.ModuleConcatenationPlugin(),
    new ExtractTextPlugin({ filename: './styles/style.css', disable: true, allChunks: true }),
    new CopyWebpackPlugin([{ from: 'public', to: 'public' }]),
    new webpack.HotModuleReplacementPlugin(),
    new OpenBrowserPlugin({ url: 'http://localhost:3000' }),
  ],
};

module.exports = config;