postcss.config.js

const purgecss = require("@fullhuman/postcss-purgecss")({
  // Specify the paths to all of the template files in your project
  content: ["./index.html"],
  // This is the function used to extract class names from your templates
  defaultExtractor: (content) => {
    // Capture as liberally as possible, including things like `h-(screen-1.5)`
    const broadMatches = content.match(/[^<>"'`\s]*[^<>"'`\s:]/g) || [];

    // Capture classes within other delimiters like .block(class="w-1/2") in Pug
    const innerMatches = content.match(/[^<>"'`\s.()]*[^<>"'`\s.():]/g) || [];

    return broadMatches.concat(innerMatches);
  },
});

module.exports = {
  plugins: [
    require("postcss-import")(),
    require("tailwindcss")(),
    require("autoprefixer")(),
    require("postcss-copy")({
      dest: "assets/webfonts",
    }),
    ...(process.env.ENV_BUILD === "prod" ? [purgecss] : []),
    ...(process.env.ENV_BUILD === "prod" ? [require("cssnano")()] : []),
  ],
};