Error: No valid exports main found for 'D:\my-app\node_modules\postcss-safe-parser\node_modules\postcss code example

Example: node_modules colorette' do not define a valid '.' target

Node v13.0.1 is having problems with this. 
Try upgrading the node version or downgrade to v12.
	npm i --save node@12.18.3

Check your globally installed node version with
	node --version
Or check the node locally installed node version with
	npm list node

After this you might be required to run
	npm rebuild node-sass