newbee-mall | newbeemall 项目（新蜂商城）是一套电商系统，包括 newbeemall 商城系统及 newbeemalladmin 商城后台管理系统，基于 Spring Boot 2.X 及相关技术栈开发。 前台商城系统包含首页门户、商品分类、新品上线、首页轮播、商品推荐、商品搜索、商品展示、购物车、订 | Object-Relational Mapping library

I've been upgrading my CRA project to TailwindCSS 3, but now CSS nesting no longer works. Upon starting the server, the console spits out:

(8:3) Nested CSS was detected, but CSS nesting has not been configured correctly.
Please enable a CSS nesting plugin *before* Tailwind in your configuration.
See how here: https://tailwindcss.com/docs/using-with-preprocessors#nesting

However, I don't see what must be done to correct this. I've tried setting up a plain CRA project with Tailwind (following this guide) just to make sure I have no conflicts, and still no success.

postcss.config.js:

module.exports = {
  plugins: {
    "tailwindcss/nesting": {},
    tailwindcss: {},
    autoprefixer: {},
  },
};

As you can see, I have added the nesting plugin before Tailwind. It appears to me as if the plugin isn't being detected whatsoever. I've also tried replacing it with postcss-nesting with same outcome.

Note: I've also tried using the array syntax with require('tailwind/nesting') like the guide suggests.

Interestingly, removing all plugins from postcss.config.js (or using a require that fails to resolve) still outputs the same error, implying that this file isn't needed to get Tailwind to load. Maybe I am missing something that causes the whole postcss.config.js file to not be loaded in the first place?

index.js:

import React from "react";
import ReactDOM from "react-dom";
import "./index.css";

ReactDOM.render(
  <React.StrictMode>
    <div className="a">
      aaa
      <div className="b">bbb</div>
    </div>
  </React.StrictMode>,
  document.getElementById("root")
);

index.css:

@tailwind base;
@tailwind components;
@tailwind utilities;

.a {
  @apply text-blue-500;

  .b {
    @apply text-green-500;
  }
}

package.json: (omitted things for brevity)

{
  "name": "tailwindtest",
  "dependencies": {
    "react": "^17.0.2",
    "react-dom": "^17.0.2",
    "react-scripts": "5.0.0"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "devDependencies": {
    "autoprefixer": "^10.4.2",
    "postcss": "^8.4.5",
    "tailwindcss": "^3.0.12"
  }
}