按照视频的操作进行的，设置了alias，还是找不到 ~common/stylus/variable 路径报错如下：

 error  in ./src/App.vue

Module build failed: Error: Failed to find '~common/stylus/variable'
  in [
    C:\Users\DELL\Desktop\vue\vue-music\vue-music\src
  ]
    at resolveModule.catch.catch (C:\Users\DELL\Desktop\vue\vue-music\vue-music\node_modules\postcss-import\lib\resolve-id.js:35:13)
    at <anonymous>

 @ ./node_modules/vue-style-loader!./node_modules/css-loader?{"sourceMap":true}!./node_modules/vue-loader/lib/style-compiler?{"vue":true,"id":"data-v-04c2046b","scoped":false,"hasInlineConfig":false}!./node_modules/vue-loader/lib/selector.js?type=styles&index=0!./src/App.vue 4:14-296 13:3-17:5 14:22-304
 @ ./src/App.vue
 @ ./src/main.js
 @ multi (webpack)-dev-server/client?http://localhost:8080 webpack/hot/dev-server ./src/main.js