There are popular UX issue:

1. User installpostcss-cli, but forgot to installpostcss
2. postcss-cli takes oldpostcss 6 orpostcss 7 from the deep dependencies
3. User havetrue is not a PostCSS plugin without a good explanation

@RyanZim we can solve this problem by checking PostCSS version inpostcss-cli:

if(parseInt(postcss().version)<8){thrownewError('Please install postcss or update it')}