Simple purgecss implementation for Vue CLI 3

package.json

// using in a Vue CLI 3, tailwindcss app but can be adjusted

"scripts": {
  "build": "vue-cli-service build",
  "postbuild": "yarn purgecss",
  "purgecss": "node_modules/purgecss/bin/purgecss --config ./purgecss.config.js --out ./dist/css"
},

purgecss.config.js

// purgecss config - https://www.purgecss.com/configuration
module.exports = {
  content: [
    './dist/**/*.html',
    './dist/js/*.js'
  ],
  css: [
    './dist/css/*.css'
  ],
  whitelistPatterns: [
    // Modernizr
    /touchevents$/,
    // Vue transition classes
    /-enter-active$/,
    /-enter$/,
    /-enter-to$/,
    /-leave-active$/,
    /-leave$/,
    /-leave-to$/
  ]
}

Runs after vue-cli-service build so you don't get the fancy report but should work