[SOLVED] No sourcemap with PostCSS (0.46)

That’s due to the piping. I am working around this by organising the css in several files and @importing them with postcss-import. My css files are in themes/mytheme/assets/css. The corresponding postcss configuration looks like this:

plugins: {
  'postcss-import': {
    path: 'themes/mytheme/assets/css'
  }
}