webpack.config.js

const path = require('path')

const webpack = require('webpack')
const copy = require('fast-copy')

const PROD = process.env.NODE_ENV === 'production'

const plugins = [
  new webpack.optimize.OccurrenceOrderPlugin(),
  new webpack.DefinePlugin({
    'process.env.NODE_ENV': JSON.stringify(process.env.NODE_ENV)
  })
]

if (PROD) {
  plugins.push(
    new webpack.LoaderOptionsPlugin({
      minimize: true,
      debug: false
    })
  )
}

const baseFileName = 'contentful'

const baseBundleConfig = {
  mode: PROD ? 'production' : 'development',
  context: path.join(__dirname, 'lib'),
  entry: [`./${baseFileName}.js`],
  output: {
    path: path.join(__dirname, 'dist'),
    libraryTarget: 'umd',
    library: 'contentful'
  },
  module: {
    rules: []
  },
  devtool: PROD ? false : 'source-map',
  plugins,
  node: {
    os: 'empty'
  },
  // Show minimal information, but all errors and warnings
  // Except for log generation which have to contain all information
  stats: process.env.WEBPACK_MODE === 'log' ? 'verbose' : 'normal'
}

const defaultBabelLoader = {
  test: /\.js?$/,
  exclude: /node_modules/,
  loader: 'babel-loader',
  options: {}
}

// Browsers with native async await calls
const browserBundle = copy(baseBundleConfig)
browserBundle.module.rules = [
  Object.assign({}, defaultBabelLoader, {
    options: Object.assign({}, defaultBabelLoader.options, {
      envName: 'browser'
    })
  })
]
browserBundle.output.filename = `${baseFileName}.browser${PROD ? '.min' : ''}.js`

// Legacy browsers like IE11, with bundled regenerator-runtime
const legacyBundle = copy(baseBundleConfig)
legacyBundle.module.rules = [
  Object.assign({}, defaultBabelLoader, {
    options: Object.assign({}, defaultBabelLoader.options, {
      envName: 'legacy'
    })
  })
]

legacyBundle.output.filename = `${baseFileName}.legacy${PROD ? '.min' : ''}.js`

// Node - bundled umd file
const nodeBundle = copy(baseBundleConfig)
nodeBundle.module.rules = [
  Object.assign({}, defaultBabelLoader, {
    options: Object.assign({}, defaultBabelLoader.options, {
      envName: 'node'
    })
  })
]
nodeBundle.target = 'node'
nodeBundle.output.libraryTarget = 'commonjs2'
nodeBundle.output.filename = `${baseFileName}.node${PROD ? '.min' : ''}.js`
delete nodeBundle.node

module.exports = [
  browserBundle,
  legacyBundle,
  nodeBundle
]