So I am currently setting up a project with just postcss and dropping scss completely. One thing I'm struggling with is the lack of any error reporting if there is a syntax fail.
So for example I've add precss plugin and when I spell a variable wrong:
So I did some investigation and chatted on postcss gitter
There is a built in way of displaying warnings and errors in postcss, however due to the plugin approach it up to the individual plugin creators to implement. The issue I had with precss which isn't being maintained so was the issue that they weren't displaying any warning. We've moved more towards cssnext which is well maintained, although the syntax is slightly different as it uses proposed css variables rather scss syntax.
You'll also need postcss-reporter to get the warnings and errors if they are implemented.