CODE EXAMPLE FOR JAVASCRIPT

Node Sass version 6.0.0 is incompatible with ^4.0.0 || ^5.0.0

//this is modifed solution from  Mr J solution 
with npm =>
1.npm uninstall node-sass
2.npm install node-sass@4.14.1
with yarn => 
1.yarn remove node-sass
2.yarn add node-sass@4.14.1