yarn add node sass version 6.0.0 is incompatible with ^4.0.0 code example

Example 1: Error: Node Sass version 5.0.0 is incompatible with ^4.0.0.

with npm =>
1.npm uninstall node-sass
2.npm install node-sass@4.14.1
with yarn => 
1.yarn remove node-sass
2.yarn remove node-sass@4.14.1

Example 2: Error: Node Sass version 5.0.0 is incompatible with ^4.0.0.

Solution
1 Uninstall node-sass
npm uninstall node-sass

2  use sass by:
npm install -g sass
npm install --save-dev sass