CSS ReactJs - 您可能需要适当的加载器来处理此文件类型，当前没有配置加载器来处理此文件

我已经知道这个问题已经被问过很多次了。我查看了所有问题，但没有用。我将 typescript 转换为 javascript，一切都很顺利，直到我开始实现 css。 导入我的 css 后，出现此错误。

ERROR in ./src/components/Navbar.css 1:0
Module parse failed: Unexpected token (1:0)
You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. See https://webpack.js.org/concepts#loaders
> .NavbarContainer {
|     width: 100%;
|     height: 100%;
 @ ./src/components/Nav.jsx 15:0-22
 @ ./src/components/index.js
 @ ./src/app.jsx
 @ ./src/index.jsx

我想要导入的 CSS 仅适用于导航栏。

这是我的网页包：

var HtmlWebpackPlugin = require('html-webpack-plugin');
const path = require('path');

module.exports = {
    mode: 'development',
    module: {
        rules: [
            {
                test: /\.(js|jsx)$/,
                loader: 'babel-loader'
            },
            {
                test: /\.css$/,
                use: [
                    { loader: 'style-loader' },
                    { loader: 'css-loader' },
                    { loader: 'less-loader' }
                ]
            }
        ]
    },
    resolve: {
        mainFiles: ['index', 'Index'],
        extensions: ['.js', '.jsx'],
        alias: {
            '@': path.resolve(__dirname, 'src/'),
        }
    },
    plugins: [new HtmlWebpackPlugin({
        template: './src/index.html'
    })],
    devServer: {
        historyApiFallback: true
    },
    externals: {
        // global app config object
        config: JSON.stringify({
            apiUrl: 'http://localhost:4000'
        })
    }
}

这是我的 package.json

{
    "name": "glitcher",
    "version": "1.0.0",
    "license": "MIT",
    "scripts": {
        "build": "webpack --mode production",
        "start": "webpack-dev-server --open"
    },
    "dependencies": {
        "formik": "^2.1.4",
        "history": "^4.10.1",
        "prop-types": "^15.7.2",
        "query-string": "^6.11.0",
        "react": "^16.8.6",
        "react-dom": "^16.8.6",
        "react-router-dom": "^5.0.0",
        "rxjs": "^6.3.3",
        "yup": "^0.28.1"
    },
    "devDependencies": {
        "@babel/core": "^7.4.3",
        "@babel/preset-env": "^7.4.3",
        "@babel/preset-react": "^7.0.0",
        "babel-loader": "^8.0.5",
        "css-loader": "^3.6.0",
        "html-webpack-plugin": "^3.2.0",
        "less": "^3.11.0",
        "less-loader": "^5.0.0",
        "path": "^0.12.7",
        "style-loader": "^1.1.3",
        "webpack": "^4.46.0",
        "webpack-cli": "^3.3.0",
        "webpack-dev-server": "^3.2.1"
    }
}

该代码工作正常。我尝试卸载所有内容并执行另一个项目，但我认为错误不是来自 npm 包。 webpack.config 中有些东西让我无法理解，我需要一些帮助。

谢谢你！

The less-loader插件将 Less 文件转换为 CSS。规则应该是：

{
    test: /\.less$/,
    use: [
        { loader: 'style-loader' },
        { loader: 'css-loader' },
        { loader: 'less-loader' }
    ]
}

编译器抛出错误，因为您试图将 CSS 文件传递​​给 Less 加载器 - 它不知道如何处理它。如果您的项目中实际上没有任何 Less 文件，只需删除less-loader并更改属性test to /\.css$/:

{
    test: /\.css$/,
    use: [
        { loader: 'style-loader' },
        { loader: 'css-loader' }
    ]
}

否则，保留这两个规则以涵盖 Less 和 CSS 文件。