old_contents: import { defaults } from 'lodash'
  import { extractStyles, styleLoader } from './helpers'
  
  export default function ({ isClient }) {
    let babelOptions = JSON.stringify(defaults(this.options.build.babel, {
      presets: ['vue-app'],
      babelrc: false,
      cacheDirectory: !!this.options.dev
    }))
  
    // https://github.com/vuejs/vue-loader/blob/master/docs/en/configurations
    const config = {
      postcss: this.options.build.postcss,
      loaders: {
        'js': 'babel-loader?' + babelOptions,
        'css': styleLoader.call(this, 'css'),
        'less': styleLoader.call(this, 'less', 'less-loader'),
        'sass': styleLoader.call(this, 'sass', 'sass-loader?indentedSyntax&?sourceMap'),
        'scss': styleLoader.call(this, 'sass', 'sass-loader?sourceMap'),
        'stylus': styleLoader.call(this, 'stylus', 'stylus-loader'),
        'styl': styleLoader.call(this, 'stylus', 'stylus-loader')
      },
      preserveWhitespace: false,
      extractCSS: extractStyles.call(this)
    }
  
    // Return the config
    return config
  }
  
new_contents: import { defaults } from 'lodash'
  import { extractStyles, styleLoader } from './helpers'
  
  export default function ({ isClient }) {
    let babelOptions = JSON.stringify(defaults(this.options.build.babel, {
      presets: ['vue-app'],
      babelrc: false,
      cacheDirectory: !!this.options.dev
    }))
  
    // https://github.com/vuejs/vue-loader/blob/master/docs/en/configurations
    const config = {
      postcss: this.options.build.postcss,
      loaders: {
        'js': 'babel-loader?' + babelOptions,
        'css': styleLoader.call(this, 'css'),
        'less': styleLoader.call(this, 'less', 'less-loader'),
        'sass': styleLoader.call(this, 'sass', 'sass-loader?indentedSyntax&sourceMap'),
        'scss': styleLoader.call(this, 'sass', 'sass-loader?sourceMap'),
        'stylus': styleLoader.call(this, 'stylus', 'stylus-loader'),
        'styl': styleLoader.call(this, 'stylus', 'stylus-loader')
      },
      preserveWhitespace: false,
      extractCSS: extractStyles.call(this)
    }
  
    // Return the config
    return config
  }
  
subject: remove extra ? in sass loader query