postcss.config.js

// Please do not use the array form (like ['tailwindcss', 'postcss-preset-env'])
// it will create an unexpected error: Invalid PostCSS Plugin found: [0]

module.exports = {
  plugins: {
    tailwindcss: {},
    autoprefixer: {},
    ...(process.env.NODE_ENV === 'production' ? { cssnano: {} } : {}),
  },
};