TypeError: Invalid PostCSS Plugin found at: plugins[0]

[p21nc3]

postcss.config.js file

const purgecss = require("@fullhuman/postcss-purgecss")({
  content: [
    "./public/**/*.html",
    "./src/**/*.js",
  ],
  defaultExtractor: (content) => content.match(/[\w-/:]+(?<!:)/g) || [],
});

module.exports = {
  plugins: {
    'postcss-preset-env': {},
    tailwindcss: {},
  },
};

module.exports = {
  plugins: [
    require("tailwindcss"),
    require("autoprefixer"),
    ...(process.env.NODE_ENV === "production" ? [purgecss] : []),
  ],
};

module.exports = {
  plugins: [
    'postcss-import',
    'tailwindcss',
    ['postcss-purgecss', {
      content: ['./src/**/*.html', './src/**/*.js'],
      defaultExtractor: (content) => {
        return content.match(/[A-z0-9-]+/g)
      },
      name: 'postcss-flexbugs-fixes',
        options: {
      },
    }],
    'autoprefixer',
  ],
};

package.json file

{
  "name": "tailwind-react-boilerplate",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "@auth0/auth0-react": "^1.10.2",
    "@headlessui/react": "^1.6.6",
    "@heroicons/react": "^1.0.6",
    "@testing-library/jest-dom": "^4.2.4",
    "@testing-library/react": "^9.5.0",
    "@testing-library/user-event": "^7.2.1",
    "axios": "^0.27.2",
    "npm-run-all": "^4.1.5",
    "react": "^16.13.1",
    "react-dom": "^16.13.1",
    "react-router": "^6.3.0",
    "react-router-dom": "^6.3.0",
    "react-scripts": "^5.0.1"
  },
  "scripts": {
    "build:tailwind": "postcss src/tailwind.css -o src/tailwind.generated.css",
    "watch:tailwind": "postcss -w src/tailwind.css -o src/tailwind.generated.css",
    "start": "run-p watch:tailwind start:react",
    "start:react": "react-scripts start",
    "prebuild": "npm run build:tailwind",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "eslintConfig": {
    "extends": "react-app"
  },
  "browserslist": {
    "production": [
      ">0.2%",
      "not dead",
      "not op_mini all"
    ],
    "development": [
      "last 1 chrome version",
      "last 1 firefox version",
      "last 1 safari version"
    ]
  },
  "devDependencies": {
    "@fullhuman/postcss-purgecss": "^5.0.0",
    "autoprefixer": "^10.4.15",
    "postcss": "^8.4.28",
    "postcss-cli": "^10.1.0",
    "postcss-flexbugs-fixes": "^5.0.2",
    "tailwindcss": "^3.3.3"
  }
}

while running locally only the HTML part is executing, some issue with CSS part (tailwind). It's an react app with tailwind running with nodejs.