For front-end SCSS Compile => you should
1) Write in cmd at root folder ( public_html ) 'npm install'.
2) Write in cmd at root folder 'npm run scss' ( Script in package.json )

"scripts": {
    "test": "echo \"Error:npm i --save-dev gulp-sass no test specified\" && exit 1",
    "scss": "node-sass --watch scss -o assets/css"
  }


3) Open your localhost