ProgressBarWebpackPlugin

npm i -D progress-bar-webpack-plugin

var ProgressBarPlugin = require('progress-bar-webpack-plugin');
...
var webpackConfig = {
  entry: 'index.js',
  output: {
    path: path.resolve(__dirname, './dist'),
    filename: 'index_bundle.js'
  },
  plugins: [
    ...,
    new ProgressBarPlugin({
      complete: Chalk.green('█'),
      incomplete: Chalk.white('█'),
      format: '  build :bar ' + Chalk.green.bold(':percent') + ' (:elapsed seconds)'
    })
  ]
};