Node Sass version 6.0.0 is incompatible with ^4.0.0. yarn 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