webpack.config.js

const path = require('path');
const webpack = require('webpack');
const UglifyJSPlugin = require('uglifyjs-webpack-plugin');

module.exports = {
  mode: 'development',
  entry: ['./src/main.js'],
  output: {
    path: path.resolve(__dirname, './dist'),
    publicPath: '/dist/',
    filename: 'build.js'
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        loader: 'babel-loader',
        exclude: /node_modules/
      },
      {
        test: /\.(css|scss)$/,
        use: [{
          loader: "css-loader" // translates CSS into CommonJS
        }, {
          loader: "sass-loader" // compiles Sass to CSS
        }]
      },
      {
        type: 'javascript/auto',
        test: /\.json$/,
        exclude: /(node_modules)/,
        use: [{
          loader: 'json-loader',
          options: { name: '[name].[ext]' },
        }],
      },
      {
        test: /\.(png|jpg|jpeg|gif|svg|woff|woff2|eot|ttf)$/,
        loader: 'file-loader',
        query: {
          name: 'img/[name].[ext]?[hash]'
        }
      },
      {
        test: /\.vue$/,
        loader: 'vue-loader',
        options: {
          loaders: {
            js: 'babel-loader!eslint-loader',
            css: 'sass-loader'
          }
        }
      }
    ]
  },

  devServer: {
    historyApiFallback: true,
    noInfo: true
  },
  devtool: '#eval-source-map'
};

if (process.env.NODE_ENV === 'production') {
  // module.exports.devtool = '#source-map';
  // http://vue-loader.vuejs.org/en/workflow/production.html
  module.exports.plugins = (module.exports.plugins || []).concat([
    new webpack.DefinePlugin({
      'process.env': {
        NODE_ENV: '"production"'
      }
    }),
    new UglifyJSPlugin({
      uglifyOptions: {
        compress: {
          drop_console: true,
          warnings: false
        }
      }
    })
  ]);
}