Passing Options to Preprocessor Loaders vue config doesn't work code example

Example: setup scss in vue

npm i node-sass sass-loader

// create the path: styles/main.scss in your src directory
–src
  |––styles
  |––main.scss

// add this to your vue.config.js file in the root directory
module.exports = {
  css: {
    loaderOptions: {
      sass: {
        prependData: `@import "@/styles/_variables.scss";`
      }
    }
  }
};