vue-cli创建项目的loader问题

　　在使用vue-cli项目创建项目中，使用sass等预编译css语言时，不需要在config中配置，只需要在项目中安装相应loader即可。
例如：
1.在项目中使用sass

$ npm i node-sass -D$ npm i sass-loader -D

2.当使用vuex时，即使安装vux和vux-loader，在项目中使用了vux的组件，项目就无法启动，报错如下：

These dependencies were not found:* !!vue-style-loader!css-loader?{"minimize":false,"sourceMap":false}!../../../../vue-loader/lib/style-compiler/index?{"vue":true,"id":"data-v-28d8bf8a","scoped":false,"hasInlineConfig":false}!../../../../vux-loader/src/after-less-loader.js!less-loader?{"sourceMap":false}!../../../../vux-loader/src/style-loader.js!../../../../vue-loader/lib/selector?type=styles&index=0!./index.vue in ./~/vux/src/components/cell/index.vue* !!vue-style-loader!css-loader?{"minimize":false,"sourceMap":false}!../../../../vue-loader/lib/style-compiler/index?{"vue":true,"id":"data-v-76475f48","scoped":false,"hasInlineConfig":false}!../../../../vux-loader/src/after-less-loader.js!less-loader?{"sourceMap":false}!../../../../vux-loader/src/style-loader.js!../../../../vue-loader/lib/selector?type=styles&index=0!./index.vue in ./~/vux/src/components/group/index.vueTo install them, you can run: npm install --save !!vue-style-loader!css-loader?{"minimize":false,"sourceMap":false}!../../../../vue-loader/lib/style-compiler/index?{"vue":true,"id":"data-v-28d8bf8a","scoped":false,"hasInlineConfig":false}!../../../../vux-loader/src/after-less-loader.js!less-loader?{"sourceMap":false}!../../../../vux-loader/src/style-loader.js!../../../../vue-loader/lib/selector?type=styles&index=0!./index.vue !!vue-style-loader!css-loader?{"minimize":false,"sourceMap":false}!../../../../vue-loader/lib/style-compiler/index?{"vue":true,"id":"data-v-76475f48","scoped":false,"hasInlineConfig":false}!../../../../vux-loader/src/after-less-loader.js!less-loader?{"sourceMap":false}!../../../../vux-loader/src/style-loader.js!../../../../vue-loader/lib/selector?type=styles&index=0!./index.vue> Listening at http://localhost:8080

大概看一眼可以确定loader出了问题，但是我已经安装了sass编译的依赖，依然无法解决错误。
后来去vux的包中看了一下，组件中使用的是less，于是安装less依赖解决问题。