title: Unknown word error when import css file
body: <p>I'm trying to import material icons for my project (following instruction in: <a href="https://vuetifyjs.com/en/framework/icons" rel="nofollow noreferrer">https://vuetifyjs.com/en/framework/icons</a>)</p>
  
  <p>nuxt.config.js</p>
  
  <pre><code>...
  extend(config, {isDev, isClient, isServer}) {
        if (isDev &amp;&amp; isClient) {
          config.module.rules.push({
              enforce: 'pre',
              test: /\.(js|vue)$/,
              loader: 'eslint-loader',
              exclude: /(node_modules)/
            },
            {
              enforce: 'pre',
              test: /\.css$/,
              use: ['style-loader', 'css-loader']
            },
            {
              test: /\.(png|jpg|gif|svg|eot|ttf|woff|woff2)$/,
              loader: 'url-loader',
              options: {
                limit: 10000
              }
            }
          )
        }
        if (isServer) {
          config.externals = [
            nodeExternals({
              whitelist: [/^vuetify/]
            })
          ]
        }
      }
  ...
  </code></pre>
  
  <p>But when I try to run the project, this error appears:</p>
  
  <pre><code> ERROR  Failed to compile with 1 errors                                                                                                                                     4:05:21 PM
  
   error  in ./node_modules/material-design-icons-iconfont/dist/material-design-icons.css
  
  Module build failed: Syntax Error
  
  (2:1) Unknown word
  
    1 | 
  &gt; 2 | var content = require("!!../../css-loader/index.js!./material-design-icons.css");
      | ^
    3 | 
    4 | if(typeof content === 'string') content = [[module.id, content, '']];
  
  
   @ ./node_modules/material-design-icons-iconfont/dist/material-design-icons.css 4:14-188 13:3-17:5 14:22-196
   @ ./plugins/vuetify.js
   @ multi vue vue-router vue-meta vuex vue-style-loader/lib/addStylesClient css-loader/lib/css-base ~/plugins/vuetify.js
  </code></pre>
  
  <p>My vuetify.js file</p>
  
  <pre><code>import Vuetify from 'vuetify'
  import Vue from 'vue'
  import 'material-design-icons-iconfont/dist/material-design-icons.css'
  
  Vue.use(Vuetify)
  </code></pre>
  
  <p>I have no idea what I did wrong, please help me to point it out. Many thanks.</p>