使用SASS的时候, 应该匹配scss, 而非sass

---
> 如果使用sass旧语法（sass语法），文件后缀名应为`.sass`
> 如果使用sass新语法（scss语法），文件后缀名应为`.scss`语法。

---

参考

https://github.com/twbs/bootstrap/blob/v4-dev/scss/_variables.scss

http://www.sasschina.com/guide/

---

```js
sass: ExtractTextPlugin.extract({
use: ['css-loader?minimize', 'autoprefixer-loader', 'sass-loader'],
fallback: 'vue-style-loader'
}),
{
test: /\.sass/,
use: ExtractTextPlugin.extract({
use: ['autoprefixer-loader', 'sass-loader'],
fallback: 'style-loader'
})
},
```

Start by locating the JavaScript configuration containing the shown ExtractTextPlugin and sass-loader entries, then verify how the current test pattern treats .sass and .scss files. Done when the matcher distinguishes the two Sass syntaxes as requested and the existing build behavior remains intact.

Written by the indexing model from the issue text.