Webpack + tailwindcss

webpack.tailwindcss.js

const purgecss = require('@fullhuman/postcss-purgecss')({

  // Specify the paths to all of the template files in your project
  content: [
    './src/**/*.html',
    './src/**/*.jsx',
    // etc.
  ],

  // Include any special characters you're using in this regular expression
  defaultExtractor: content => content.match(/[\w-/:]+(?<!:)/g) || []
});

module.exports = {
  module : {
    rules: [
      {
        test   : /\.scss$/,
        loader : 'postcss-loader',
        options: {
          ident  : 'postcss',
          syntax: 'postcss-scss',
          plugins: () => [
            require('postcss-import'),
            require('tailwindcss'),
            require('autoprefixer'),
            ...process.env.NODE_ENV === 'production'
              ? [purgecss]
              : []
          ]
        }
      }
    ]
  }
};