Error loading lang= "postcss', in vue document

.vue file uses < style lang= "postcss" >, error loading

related codes

    //webpack.config.js
    module: {
        rules: [
            {
                test: /\.css$/,
                include: [path.resolve(__dirname, "./src")],
                exclude: /node_modules/,
                use: [
                    "vue-style-loader",
                    {
                        loader: "css-loader",
                        options: {
                            modules: false,
                            importLoaders: 1
                        }
                    },
                    {
                        loader: "postcss-loader",
                        options: {
                            plugins: [
                                require("postcss-import")(),
                                require("postcss-url")(),
                                require("autoprefixer")()
                            ]
                        }
                    }
                ]
            }
        ]
    }

error message

Module parse failed: Unexpected token (54:7)
You may need an appropriate loader to handle this file type.
|
|
> ul, li {
|   list-style-type: none;
| }
Css
May.23,2022

resolved.
test: /\ .css $/ , change it to test: /\. (css | postcss) $/

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