postcss.config.js

const IN_PRODUCTION = process.env.NODE_ENV === 'production';

module.exports = {
  plugins: [
    IN_PRODUCTION &&
      require('@fullhuman/postcss-purgecss')({
        content: ['./public/**/*.html', './src/**/*.vue'],
        defaultExtractor(content) {
          const contentWithoutStyleBlocks = content.replace(
            /<style[^]+?<\/style>/gi,
            '',
          );
          return (
            contentWithoutStyleBlocks.match(
              /[A-Za-z0-9-_/:]*[A-Za-z0-9-_/]+/g,
            ) || []
          );
        },
        safelist: [
          /-(leave|enter|appear)(|-(to|from|active))$/,
          /^(?!(|.*?:)cursor-move).+-move$/,
          /^router-link(|-exact)-active$/,
          /data-v-.*/,
          /is-text/,
          /control/,
          /select/,
          /^tabs.*/,
          /is-boxed/,
          /app-modal/,
          /overlay/,
          /^modal.*/,
          /padding.*/,
          /icon/,
          /close-button/,
          /has-color-gray/,
          /is-size-.*/,
        ],
      }),
  ],
};