title: Less loader in vue-cli project
body: <p>I am trying to use a less file in my vue-cli created project.</p>
  
  <p>Also the question if this is best practice. Earlier I added webpack globally and started a watcher and added a webpack.config.js</p>
  
  <p>This time I created the project with vue-cli / vue ui and the doc says I have to use a vue.config.js where I do this:</p>
  
  <pre><code>module.exports = {
  css: {
      loaderOptions: {
          // pass options to sass-loader
          less: {
              // @/ is an alias to src/
              // so this assumes you have a file named `src/variables.scss`
              data: `@import "@/all.less";`
          }
      }
  }
  }
  </code></pre>
  
  <p>I added the file in src/all.less and also tried src/assets/less/all.less and changed the path in the config file. Both do not seem to work tho.</p>