Hi i'm facing somewhat a strange problem during $npm run serve

here is my page structure

<template>
  <div>
    ...
  </div>
</template>

<script>
export default {
   name: 'game',
   ...
}
</script>

<style lang="scss" scoped>
 $variable1:#fff;
 ....
</style>

My package.json looks something like this

"devDependencies":{
    "node-sass": "^6.0.0",
    "sass-loader": "^10.1.0",
    "vue-loader-v16": "npm:vue-loader@^16.1.1"
}