postcss.config.js

const postcssPresetEnv = require('postcss-preset-env');
const postcssFlexbugsFixes = require('postcss-flexbugs-fixes');
const postcssReporter = require('postcss-reporter');

module.exports = {
  plugins: [
    postcssFlexbugsFixes,
    postcssPresetEnv({
      autoprefixer: {
        flexbox: 'no-2009'
      },
      stage: 3
    }),
    postcssReporter({
      clearAllMessages: true
    })
  ]
};