Purge CSS in vue cli app

.postcssrc.js

const tailwindcss = require('tailwindcss')
const purgecss = require('@fullhuman/postcss-purgecss')
const autoprefixer = require('autoprefixer')
const postcssImport = require('postcss-import')

module.exports = {
  plugins: [
    postcssImport,
    tailwindcss('./tailwind.js'),
    purgecss({
      content: ['./src/**/*.vue'],
      extractors: [
        {
          extractor: class TailwindExtractor {
            static extract(content) {
              return content.match(/[A-z0-9-:\/]+/g) || []
            }
          },
          extensions: ['vue'],
        },
      ],
    }),
    autoprefixer,
  ],
}