old_contents: const path = require('path')
  const webpack = require('webpack')
  
  process.env.NODE_ENV = 'production'
  
  module.exports = {
    target: 'web',
    entry: [
      'babel-polyfill',
      'whatwg-fetch',
      './src/front/index.js'
    ],
    output: {
      path: path.join(__dirname, 'dist'),
      filename: 'bundle.js'
    },
    module: {
      rules: [
        {
          test: /\.js$/,
          exclude: /node_modules/,
          loader: 'babel-loader'
        },
        {
          test: /\.json$/,
          loader: 'json-loader'
        },
        {
          test: /\.vue$/,
          loader: 'vue-loader'
        }
      ]
    },
    resolve: {
      alias: {
        'vue$': 'vue/dist/vue.esm.js'
      }
    }
  }
  
new_contents: const path = require('path')
  
  module.exports = {
    target: 'web',
    entry: [
      'babel-polyfill',
      'whatwg-fetch',
      './src/front/index.js'
    ],
    output: {
      path: path.join(__dirname, 'dist'),
      filename: 'bundle.js'
    },
    module: {
      rules: [
        {
          test: /\.js$/,
          exclude: /node_modules/,
          loader: 'babel-loader'
        },
        {
          test: /\.json$/,
          loader: 'json-loader'
        },
        {
          test: /\.vue$/,
          loader: 'vue-loader'
        }
      ]
    },
    resolve: {
      alias: {
        'vue$': 'vue/dist/vue.esm.js'
      }
    }
  }
  
subject: Remove unused variables