Package exports for '/src/app/node_modules/colorette' do not define a valid '.' target' 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