webpack.config.js

const PACKAGE = require('./package.json')
const path = require('path')
const webpack = require('webpack')
const FriendlyErrorsPlugin = require('friendly-errors-webpack-plugin')
const HtmlWebpackPlugin = require('html-webpack-plugin')

const resolve = dir => path.join(__dirname, dir)
const banner = PACKAGE.name + ' | ' +
  '(c) ' + new Date().getFullYear() + '  ' + PACKAGE.author + ' | ' +
  PACKAGE.license + ' | ' +
  PACKAGE.homepage

const configDevelopment = {
  mode: 'development',
  entry: {
    example: './examples/index.js'
  },
  output: {
    filename: '[name].js'
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        loader: 'eslint-loader',
        enforce: 'pre',
        include: [resolve('src'), resolve('examples')],
        options: {
          formatter: require('eslint-friendly-formatter')
        }
      },
      {
        test: /\.js$/,
        loader: 'babel-loader',
        include: [resolve('src'), resolve('dist'), resolve('examples')]
      }
    ]
  },
  devtool: 'cheap-module-eval-source-map',
  devServer: {
    contentBase: [resolve('src'), resolve('dist'), resolve('examples')],
    hot: true,
    watchContentBase: true
  },
  plugins: [
    new FriendlyErrorsPlugin(),
    new webpack.HotModuleReplacementPlugin(),
    new HtmlWebpackPlugin({
      title: 'Development',
      template: './examples/index.html'
    })
  ]
}

const configProduction = {
  entry: './src/index.js',
  externals: {
    gaspard: 'gaspard'
  },
  output: {
    path: resolve('dist'),
    filename: 'gaspard-collection.umd.js',
    library: 'gaspard-collection',
    libraryTarget: 'umd',
    umdNamedDefine: true
  },
  devtool: 'source-map',
  module: {
    rules: [
      {
        test: /\.js$/,
        loader: 'eslint-loader',
        enforce: 'pre',
        include: [resolve('src')],
        options: {
          formatter: require('eslint-friendly-formatter')
        }
      },
      {
        test: /\.js$/,
        loader: 'babel-loader',
        include: [resolve('src')]
      }
    ]
  },
  plugins: [
    new webpack.BannerPlugin(banner)
  ]
}

module.exports = (env, argv) => argv.mode === 'production' ? configProduction : configDevelopment